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ttls: add support for tunneled MS-CHAP

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This commit is contained in:
Tim Kourt 2018-10-23 16:33:52 -07:00 committed by Denis Kenzior
parent b46376980a
commit e8de229223
1 changed files with 94 additions and 0 deletions
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94
src/eap-ttls.c
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@ -30,6 +30,7 @@
#include <ell/ell.h>
#include "util.h"
#include "mschaputil.h"
#include "eap.h"
#include "eap-private.h"
#include "eap-tls-common.h"
@ -47,6 +48,7 @@ enum radius_attr {
RADIUS_ATTR_USER_NAME = 1,
RADIUS_ATTR_USER_PASSWORD = 2,
RADIUS_ATTR_CHAP_PASSWORD = 3,
RADIUS_ATTR_MS_CHAP_CHALLENGE = 11,
RADIUS_ATTR_CHAP_CHALLENGE = 60,
RADIUS_ATTR_EAP_MESSAGE = 79,
};
@ -222,6 +224,58 @@ static void build_avp_chap_password(struct avp_builder *builder,
avp_builder_finalize_avp(builder);
}
#define RADIUS_VENDOR_ID_MICROSOFT 311
#define RADIUS_ATTR_MS_CHAP_RESPONSE 1
#define MS_CHAP_CHALLENGE_LEN 8
#define MS_CHAP_LM_RESPONSE_LEN 24
#define MS_CHAP_NT_RESPONSE_LEN 24
static void build_avp_ms_chap_challenge(struct avp_builder *builder,
const uint8_t *challenge)
{
avp_builder_start_avp(builder, RADIUS_ATTR_MS_CHAP_CHALLENGE, true,
RADIUS_VENDOR_ID_MICROSOFT);
memcpy(avp_builder_reserve(builder, 1, MS_CHAP_CHALLENGE_LEN),
challenge, MS_CHAP_CHALLENGE_LEN);
avp_builder_finalize_avp(builder);
}
static void build_avp_ms_chap_response(struct avp_builder *builder,
const uint8_t *ident,
const uint8_t *challenge,
const uint8_t *password_hash)
{
uint8_t *flags;
uint8_t nt_challenge_response[NT_CHALLENGE_RESPONSE_LEN];
avp_builder_start_avp(builder, RADIUS_ATTR_MS_CHAP_RESPONSE, true,
RADIUS_VENDOR_ID_MICROSOFT);
memcpy(avp_builder_reserve(builder, 1, CHAP_IDENT_LEN),
ident, CHAP_IDENT_LEN);
/*
* RFC 2548: Section 2.1.3
*
* The Flags field is set to one (0x01), the NT-Response field is to
* be used in preference to the LM-Response field for authentication.
*/
flags = avp_builder_reserve(builder, 1, 1);
*flags = 1;
/* The LM-Response field is left empty */
avp_builder_reserve(builder, 1, MS_CHAP_LM_RESPONSE_LEN);
mschap_challenge_response(challenge, password_hash,
nt_challenge_response);
memcpy(avp_builder_reserve(builder, 1, NT_CHALLENGE_RESPONSE_LEN),
nt_challenge_response, NT_CHALLENGE_RESPONSE_LEN);
avp_builder_finalize_avp(builder);
}
struct avp_iter {
enum radius_attr type;
uint8_t flags;
@ -508,6 +562,45 @@ static struct phase2_method phase2_chap = {
.destroy = eap_ttls_phase2_credentials_destroy,
};
static bool eap_ttls_phase2_ms_chap_init(struct eap_state *eap)
{
struct eap_ttls_state *ttls = eap_get_data(eap);
struct phase2_credentials *credentials = ttls->phase2->state;
struct avp_builder *builder;
uint8_t challenge[MS_CHAP_CHALLENGE_LEN + CHAP_IDENT_LEN];
uint8_t password_hash[16];
uint8_t ident;
uint8_t *data;
size_t data_len;
eap_ttls_phase2_chap_generate_challenge(ttls->tls, challenge,
MS_CHAP_CHALLENGE_LEN +
CHAP_IDENT_LEN);
ident = challenge[MS_CHAP_CHALLENGE_LEN];
builder = avp_builder_new(512);
build_avp_user_name(builder, credentials->username);
build_avp_ms_chap_challenge(builder, challenge);
mschap_nt_password_hash(credentials->password, password_hash);
build_avp_ms_chap_response(builder, &ident, challenge, password_hash);
data = avp_builder_free(builder, false, &data_len);
l_tls_write(ttls->tls, data, data_len);
l_free(data);
return true;
}
static struct phase2_method phase2_ms_chap = {
.init = eap_ttls_phase2_ms_chap_init,
.destroy = eap_ttls_phase2_credentials_destroy,
};
static bool eap_ttls_phase2_pap_init(struct eap_state *eap)
{
struct eap_ttls_state *ttls = eap_get_data(eap);
@ -996,6 +1089,7 @@ static const struct {
struct phase2_method *method;
} tunneled_non_eap_methods[] = {
{ "Tunneled-CHAP", &phase2_chap },
{ "Tunneled-MSCHAP", &phase2_ms_chap },
{ "Tunneled-PAP", &phase2_pap },
{ }
};