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pass SKd to derive_ike_keys() to have a more interoperable API

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This commit is contained in:
Martin Willi
2008-11-28 09:51:44 +00:00
parent 9a1263c3c1
commit ddef455219
3 changed files with 93 additions and 38 deletions
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src/charon/sa/keymat.c
+42 -7
View File
@@ -62,6 +62,11 @@ struct private_keymat_t {
*/
prf_t *prf;
/**
* Negotiated PRF algorithm
*/
pseudo_random_function_t prf_alg;
/**
* Key to derive key material from for CHILD_SAs, rekeying
*/
@@ -145,7 +150,8 @@ static diffie_hellman_t* create_dh(private_keymat_t *this,
static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
diffie_hellman_t *dh, chunk_t nonce_i,
chunk_t nonce_r, ike_sa_id_t *id,
private_keymat_t *rekey)
pseudo_random_function_t rekey_function,
chunk_t rekey_skd)
{
chunk_t skeyseed, key, secret, full_nonce, fixed_nonce, prf_plus_seed;
chunk_t spi_i, spi_r;
@@ -153,6 +159,7 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
signer_t *signer_i, *signer_r;
prf_plus_t *prf_plus;
u_int16_t alg, key_size;
prf_t *rekey_prf = NULL;
spi_i = chunk_alloca(sizeof(u_int64_t));
spi_r = chunk_alloca(sizeof(u_int64_t));
@@ -169,6 +176,7 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
transform_type_names, PSEUDO_RANDOM_FUNCTION);
return FALSE;
}
this->prf_alg = alg;
this->prf = lib->crypto->create_prf(lib->crypto, alg);
if (this->prf == NULL)
{
@@ -205,7 +213,7 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
*
* if we are rekeying, SKEYSEED is built on another way
*/
if (rekey == NULL) /* not rekeying */
if (rekey_function == PRF_UNDEFINED) /* not rekeying */
{
/* SKEYSEED = prf(Ni | Nr, g^ir) */
this->prf->set_key(this->prf, fixed_nonce);
@@ -217,11 +225,21 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
{
/* SKEYSEED = prf(SK_d (old), [g^ir (new)] | Ni | Nr)
* use OLD SAs PRF functions for both prf_plus and prf */
rekey_prf = lib->crypto->create_prf(lib->crypto, rekey_function);
if (!rekey_prf)
{
DBG1(DBG_IKE, "PRF of old SA %N not supported!",
pseudo_random_function_names, rekey_function);
chunk_free(&full_nonce);
chunk_free(&fixed_nonce);
chunk_clear(&prf_plus_seed);
return FALSE;
}
secret = chunk_cat("mc", secret, full_nonce);
rekey->prf->set_key(rekey->prf, rekey->skd);
rekey->prf->allocate_bytes(rekey->prf, secret, &skeyseed);
rekey->prf->set_key(rekey->prf, skeyseed);
prf_plus = prf_plus_create(rekey->prf, prf_plus_seed);
rekey_prf->set_key(rekey_prf, rekey_skd);
rekey_prf->allocate_bytes(rekey_prf, secret, &skeyseed);
rekey_prf->set_key(rekey_prf, skeyseed);
prf_plus = prf_plus_create(rekey_prf, prf_plus_seed);
}
DBG4(DBG_IKE, "SKEYSEED %B", &skeyseed);
@@ -243,6 +261,8 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
{
DBG1(DBG_IKE, "no %N selected",
transform_type_names, INTEGRITY_ALGORITHM);
prf_plus->destroy(prf_plus);
DESTROY_IF(rekey_prf);
return FALSE;
}
signer_i = lib->crypto->create_signer(lib->crypto, alg);
@@ -253,6 +273,7 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
transform_type_names, INTEGRITY_ALGORITHM,
integrity_algorithm_names ,alg);
prf_plus->destroy(prf_plus);
DESTROY_IF(rekey_prf);
return FALSE;
}
key_size = signer_i->get_key_size(signer_i);
@@ -284,6 +305,7 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
DBG1(DBG_IKE, "no %N selected",
transform_type_names, ENCRYPTION_ALGORITHM);
prf_plus->destroy(prf_plus);
DESTROY_IF(rekey_prf);
return FALSE;
}
crypter_i = lib->crypto->create_crypter(lib->crypto, alg, key_size / 8);
@@ -294,6 +316,7 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
transform_type_names, ENCRYPTION_ALGORITHM,
encryption_algorithm_names, alg, key_size);
prf_plus->destroy(prf_plus);
DESTROY_IF(rekey_prf);
return FALSE;
}
key_size = crypter_i->get_key_size(crypter_i);
@@ -344,6 +367,7 @@ static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
/* all done, prf_plus not needed anymore */
prf_plus->destroy(prf_plus);
DESTROY_IF(rekey_prf);
return TRUE;
}
@@ -442,6 +466,15 @@ static bool derive_child_keys(private_keymat_t *this,
return TRUE;
}
/**
* Implementation of keymat_t.get_skd
*/
static pseudo_random_function_t get_skd(private_keymat_t *this, chunk_t *skd)
{
*skd = this->skd;
return this->prf_alg;
}
/**
* Implementation of keymat_t.get_signer
*/
@@ -544,8 +577,9 @@ keymat_t *keymat_create(bool initiator)
private_keymat_t *this = malloc_thing(private_keymat_t);
this->public.create_dh = (diffie_hellman_t*(*)(keymat_t*, diffie_hellman_group_t group))create_dh;
this->public.derive_ike_keys = (bool(*)(keymat_t*, proposal_t *proposal, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r, ike_sa_id_t *id, keymat_t *rekey))derive_ike_keys;
this->public.derive_ike_keys = (bool(*)(keymat_t*, proposal_t *proposal, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r, ike_sa_id_t *id, pseudo_random_function_t,chunk_t))derive_ike_keys;
this->public.derive_child_keys = (bool(*)(keymat_t*, proposal_t *proposal, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r, chunk_t *encr_i, chunk_t *integ_i, chunk_t *encr_r, chunk_t *integ_r))derive_child_keys;
this->public.get_skd = (pseudo_random_function_t(*)(keymat_t*, chunk_t *skd))get_skd;
this->public.get_signer = (signer_t*(*)(keymat_t*, bool in))get_signer;
this->public.get_crypter = (crypter_t*(*)(keymat_t*, bool in))get_crypter;
this->public.get_auth_octets = (chunk_t(*)(keymat_t *, bool verify, chunk_t ike_sa_init, chunk_t nonce, identification_t *id))get_auth_octets;
@@ -559,6 +593,7 @@ keymat_t *keymat_create(bool initiator)
this->crypter_in = NULL;
this->crypter_out = NULL;
this->prf = NULL;
this->prf_alg = PRF_UNDEFINED;
this->skd = chunk_empty;
this->skp_verify = chunk_empty;
this->skp_build = chunk_empty;
src/charon/sa/keymat.h
+13 -2
View File
@@ -61,12 +61,15 @@ struct keymat_t {
* @param nonce_i initiators nonce value
* @param nonce_r responders nonce value
* @param id IKE_SA identifier
* @param rekey keymat of old SA if we are rekeying
* @param rekey_prf PRF of old SA if rekeying, PRF_UNDEFINED otherwise
* @param rekey_sdk SKd of old SA if rekeying
* @return TRUE on success
*/
bool (*derive_ike_keys)(keymat_t *this, proposal_t *proposal,
diffie_hellman_t *dh, chunk_t nonce_i,
chunk_t nonce_r, ike_sa_id_t *id, keymat_t *rekey);
chunk_t nonce_r, ike_sa_id_t *id,
pseudo_random_function_t rekey_function,
chunk_t rekey_skd);
/**
* Derive keys for a CHILD_SA.
*
@@ -90,6 +93,14 @@ struct keymat_t {
chunk_t nonce_i, chunk_t nonce_r,
chunk_t *encr_i, chunk_t *integ_i,
chunk_t *encr_r, chunk_t *integ_r);
/**
* Get SKd to pass to derive_ikey_keys() during rekeying.
*
* @param skd chunk to write SKd to (internal data)
* @return PRF function to derive keymat
*/
pseudo_random_function_t (*get_skd)(keymat_t *this, chunk_t *skd);
/**
* Get a signer to sign/verify IKE messages.
*
src/charon/sa/tasks/ike_init.c
+38 -29
View File
@@ -369,14 +369,47 @@ static status_t process_r(private_ike_init_t *this, message_t *message)
return NEED_MORE;
}
/**
* Derive the keymat for the IKE_SA
*/
static bool derive_keys(private_ike_init_t *this,
chunk_t nonce_i, chunk_t nonce_r)
{
keymat_t *old_keymat;
pseudo_random_function_t prf_alg = PRF_UNDEFINED;
chunk_t skd = chunk_empty;
ike_sa_id_t *id;
id = this->ike_sa->get_id(this->ike_sa);
if (this->old_sa)
{
/* rekeying: Include old SKd, use old PRF, apply SPI */
old_keymat = this->old_sa->get_keymat(this->old_sa);
prf_alg = old_keymat->get_skd(old_keymat, &skd);
if (this->initiator)
{
id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
}
else
{
id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
}
}
if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
nonce_i, nonce_r, id, prf_alg, skd))
{
return FALSE;
}
charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh,
nonce_i, nonce_r, this->old_sa);
return TRUE;
}
/**
* Implementation of task_t.build for responder
*/
static status_t build_r(private_ike_init_t *this, message_t *message)
{
keymat_t *old_keymat = NULL;
ike_sa_id_t *id;
/* check if we have everything we need */
if (this->proposal == NULL ||
this->other_nonce.len == 0 || this->my_nonce.len == 0)
@@ -410,23 +443,12 @@ static status_t build_r(private_ike_init_t *this, message_t *message)
return FAILED;
}
id = this->ike_sa->get_id(this->ike_sa);
if (this->old_sa)
{ /* rekeying: Apply SPI, include keymat from old SA in key derivation */
id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
old_keymat = this->old_sa->get_keymat(this->old_sa);
}
if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
this->other_nonce, this->my_nonce, id, old_keymat))
if (!derive_keys(this, this->other_nonce, this->my_nonce))
{
DBG1(DBG_IKE, "key derivation failed");
message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
return FAILED;
}
charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh,
this->other_nonce, this->my_nonce, this->old_sa);
build_payloads(this, message);
return SUCCESS;
}
@@ -436,8 +458,6 @@ static status_t build_r(private_ike_init_t *this, message_t *message)
*/
static status_t process_i(private_ike_init_t *this, message_t *message)
{
keymat_t *old_keymat = NULL;
ike_sa_id_t *id;
iterator_t *iterator;
payload_t *payload;
@@ -521,22 +541,11 @@ static status_t process_i(private_ike_init_t *this, message_t *message)
return FAILED;
}
id = this->ike_sa->get_id(this->ike_sa);
if (this->old_sa)
{ /* rekeying: Apply SPI, include keymat from old SA in key derivation */
id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
old_keymat = this->old_sa->get_keymat(this->old_sa);
}
if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
this->my_nonce, this->other_nonce, id, old_keymat))
if (!derive_keys(this, this->my_nonce, this->other_nonce))
{
DBG1(DBG_IKE, "key derivation failed");
return FAILED;
}
charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh,
this->my_nonce, this->other_nonce, this->old_sa);
return SUCCESS;
}