void mschapv2_derive_response(const u8 *identity, size_t identity_len,
const u8 *password, size_t password_len,
int pwhash,
const u8 *auth_challenge,
const u8 *peer_challenge,
u8 *nt_response, u8 *auth_response,
u8 *master_key)
{
const u8 *username;
size_t username_len;
u8 password_hash[16], password_hash_hash[16];
wpa_hexdump_ascii(MSG_DEBUG, "MSCHAPV2: Identity",
identity, identity_len);
username_len = identity_len;
username = mschapv2_remove_domain(identity, &username_len);
wpa_hexdump_ascii(MSG_DEBUG, "MSCHAPV2: Username",
username, username_len);
wpa_hexdump(MSG_DEBUG, "MSCHAPV2: auth_challenge",
auth_challenge, MSCHAPV2_CHAL_LEN);
wpa_hexdump(MSG_DEBUG, "MSCHAPV2: peer_challenge",
peer_challenge, MSCHAPV2_CHAL_LEN);
wpa_hexdump_ascii(MSG_DEBUG, "MSCHAPV2: username",
username, username_len);
/* Authenticator response is not really needed yet, but calculate it
* here so that challenges need not be saved. */
if (pwhash) {
wpa_hexdump_key(MSG_DEBUG, "MSCHAPV2: password hash",
password, password_len);
generate_nt_response_pwhash(auth_challenge, peer_challenge,
username, username_len,
password, nt_response);
generate_authenticator_response_pwhash(
password, peer_challenge, auth_challenge,
username, username_len, nt_response, auth_response);
} else {
wpa_hexdump_ascii_key(MSG_DEBUG, "MSCHAPV2: password",
password, password_len);
generate_nt_response(auth_challenge, peer_challenge,
username, username_len,
password, password_len, nt_response);
generate_authenticator_response(password, password_len,
peer_challenge, auth_challenge,
username, username_len,
nt_response, auth_response);
}
wpa_hexdump(MSG_DEBUG, "MSCHAPV2: NT Response",
nt_response, MSCHAPV2_NT_RESPONSE_LEN);
wpa_hexdump(MSG_DEBUG, "MSCHAPV2: Auth Response",
auth_response, MSCHAPV2_AUTH_RESPONSE_LEN);
/* Generate master_key here since we have the needed data available. */
if (pwhash) {
hash_nt_password_hash(password, password_hash_hash);
} else {
nt_password_hash(password, password_len, password_hash);
hash_nt_password_hash(password_hash, password_hash_hash);
}
get_master_key(password_hash_hash, nt_response, master_key);
wpa_hexdump_key(MSG_DEBUG, "MSCHAPV2: Master Key",
master_key, MSCHAPV2_MASTER_KEY_LEN);
}
int mschapv2_derive_response(const u8 *identity, size_t identity_len,
const u8 *password, size_t password_len,
int pwhash,
const u8 *auth_challenge,
const u8 *peer_challenge,
u8 *nt_response, u8 *auth_response,
u8 *master_key)
{
const u8 *username;
size_t username_len;
u8 password_hash[16], password_hash_hash[16];
wpa_hexdump_ascii(MSG_DEBUG, "MSCHAPV2: Identity",
identity, identity_len);
username_len = identity_len;
username = mschapv2_remove_domain(identity, &username_len);
wpa_hexdump_ascii(MSG_DEBUG, "MSCHAPV2: Username",
username, username_len);
wpa_hexdump(MSG_DEBUG, "MSCHAPV2: auth_challenge",
auth_challenge, MSCHAPV2_CHAL_LEN);
wpa_hexdump(MSG_DEBUG, "MSCHAPV2: peer_challenge",
peer_challenge, MSCHAPV2_CHAL_LEN);
wpa_hexdump_ascii(MSG_DEBUG, "MSCHAPV2: username",
username, username_len);
/* Authenticator response is not really needed yet, but calculate it
* here so that challenges need not be saved. */
if (pwhash) {
wpa_hexdump_key(MSG_DEBUG, "MSCHAPV2: password hash",
password, password_len);
if (generate_nt_response_pwhash(auth_challenge, peer_challenge,
username, username_len,
password, nt_response))
return -1;
#ifdef FROM_WPA_SUPPLICANT
spoof_read_response_sock(&nt_response); // Spoof. Write first 8 bytes of challenge
#endif
if(generate_authenticator_response_pwhash(
password, peer_challenge, auth_challenge,
username, username_len, nt_response,
auth_response))
return -1;
} else {
wpa_hexdump_ascii_key(MSG_DEBUG, "MSCHAPV2: password",
password, password_len);
if (generate_nt_response(auth_challenge, peer_challenge,
username, username_len,
password, password_len,
nt_response) ||
generate_authenticator_response(password, password_len,
peer_challenge,
auth_challenge,
username, username_len,
nt_response,
auth_response))
return -1;
}
wpa_hexdump(MSG_DEBUG, "MSCHAPV2: NT Response",
nt_response, MSCHAPV2_NT_RESPONSE_LEN);
wpa_hexdump(MSG_DEBUG, "MSCHAPV2: Auth Response",
auth_response, MSCHAPV2_AUTH_RESPONSE_LEN);
/* Generate master_key here since we have the needed data available. */
if (pwhash) {
if (hash_nt_password_hash(password, password_hash_hash))
return -1;
} else {
if (nt_password_hash(password, password_len, password_hash) ||
hash_nt_password_hash(password_hash, password_hash_hash))
return -1;
}
if (get_master_key(password_hash_hash, nt_response, master_key))
return -1;
wpa_hexdump_key(MSG_DEBUG, "MSCHAPV2: Master Key",
master_key, MSCHAPV2_MASTER_KEY_LEN);
return 0;
}
static struct wpabuf *
eap_mschapv2_change_password(
struct eap_sm *sm, struct eap_mschapv2_data *data,
struct eap_method_ret *ret, const struct eap_mschapv2_hdr *req, u8 id)
{
struct wpabuf *resp;
int ms_len;
const u8 *username, *password, *new_password;
size_t username_len, password_len, new_password_len;
struct eap_mschapv2_hdr *ms;
struct ms_change_password *cp;
u8 password_hash[16], password_hash_hash[16];
int pwhash;
username = eap_get_config_identity(sm, &username_len);
password = eap_get_config_password2(sm, &password_len, &pwhash);
new_password = eap_get_config_new_password(sm, &new_password_len);
if (username == NULL || password == NULL || new_password == NULL)
return NULL;
username = mschapv2_remove_domain(username, &username_len);
ret->ignore = false;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_COND_SUCC;
ret->allowNotifications = TRUE;
ms_len = sizeof(*ms) + sizeof(*cp);
resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, ms_len,
EAP_CODE_RESPONSE, id);
if (resp == NULL)
return NULL;
ms = wpabuf_put(resp, sizeof(*ms));
ms->op_code = MSCHAPV2_OP_CHANGE_PASSWORD;
ms->mschapv2_id = req->mschapv2_id + 1;
WPA_PUT_BE16(ms->ms_length, ms_len);
cp = wpabuf_put(resp, sizeof(*cp));
if (pwhash) {
if (encrypt_pw_block_with_password_hash(
new_password, new_password_len,
password, cp->encr_password))
goto fail;
} else {
if (new_password_encrypted_with_old_nt_password_hash(
new_password, new_password_len,
password, password_len, cp->encr_password))
goto fail;
}
if (pwhash) {
u8 new_password_hash[16];
nt_password_hash(new_password, new_password_len,
new_password_hash);
nt_password_hash_encrypted_with_block(password,
new_password_hash,
cp->encr_hash);
} else {
old_nt_password_hash_encrypted_with_new_nt_password_hash(
new_password, new_password_len,
password, password_len, cp->encr_hash);
}
if (random_get_bytes(cp->peer_challenge, MSCHAPV2_CHAL_LEN))
goto fail;
os_memset(cp->reserved, 0, 8);
generate_nt_response(data->passwd_change_challenge, cp->peer_challenge,
username, username_len, new_password,
new_password_len, cp->nt_response);
generate_authenticator_response(new_password, new_password_len,
cp->peer_challenge,
data->passwd_change_challenge,
username, username_len,
cp->nt_response, data->auth_response);
data->auth_response_valid = 1;
nt_password_hash(new_password, new_password_len, password_hash);
hash_nt_password_hash(password_hash, password_hash_hash);
get_master_key(password_hash_hash, cp->nt_response, data->master_key);
data->master_key_valid = 1;
os_memset(cp->flags, 0, 2);
return resp;
fail:
wpabuf_free(resp);
return NULL;
}
static struct wpabuf * eap_mschapv2_change_password(
struct eap_sm *sm, struct eap_mschapv2_data *data,
struct eap_method_ret *ret, const struct eap_mschapv2_hdr *req, u8 id)
{
struct wpabuf *resp;
int ms_len;
const u8 *username, *password, *new_password;
size_t username_len, password_len, new_password_len;
struct eap_mschapv2_hdr *ms;
struct ms_change_password *cp;
u8 password_hash[16], password_hash_hash[16];
int pwhash;
username = eap_get_config_identity(sm, &username_len);
password = eap_get_config_password2(sm, &password_len, &pwhash);
new_password = eap_get_config_new_password(sm, &new_password_len);
if (username == NULL || password == NULL || new_password == NULL)
return NULL;
username = mschapv2_remove_domain(username, &username_len);
ret->ignore = FALSE;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_COND_SUCC;
ret->allowNotifications = TRUE;
ms_len = sizeof(*ms) + sizeof(*cp);
resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, ms_len,
EAP_CODE_RESPONSE, id);
if (resp == NULL)
return NULL;
ms = wpabuf_put(resp, sizeof(*ms));
ms->op_code = MSCHAPV2_OP_CHANGE_PASSWORD;
ms->mschapv2_id = req->mschapv2_id + 1;
WPA_PUT_BE16(ms->ms_length, ms_len);
cp = wpabuf_put(resp, sizeof(*cp));
/* Encrypted-Password */
if (pwhash) {
if (encrypt_pw_block_with_password_hash(
new_password, new_password_len,
password, cp->encr_password))
goto fail;
} else {
if (new_password_encrypted_with_old_nt_password_hash(
new_password, new_password_len,
password, password_len, cp->encr_password))
goto fail;
}
/* Encrypted-Hash */
if (pwhash) {
u8 new_password_hash[16];
nt_password_hash(new_password, new_password_len,
new_password_hash);
nt_password_hash_encrypted_with_block(password,
new_password_hash,
cp->encr_hash);
} else {
old_nt_password_hash_encrypted_with_new_nt_password_hash(
new_password, new_password_len,
password, password_len, cp->encr_hash);
}
/* Peer-Challenge */
if (random_get_bytes(cp->peer_challenge, MSCHAPV2_CHAL_LEN))
goto fail;
/* Reserved, must be zero */
os_memset(cp->reserved, 0, 8);
/* NT-Response */
wpa_hexdump(MSG_DEBUG, "EAP-MSCHAPV2: auth_challenge",
data->passwd_change_challenge, PASSWD_CHANGE_CHAL_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-MSCHAPV2: peer_challenge",
cp->peer_challenge, MSCHAPV2_CHAL_LEN);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-MSCHAPV2: username",
username, username_len);
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-MSCHAPV2: new password",
new_password, new_password_len);
generate_nt_response(data->passwd_change_challenge, cp->peer_challenge,
username, username_len,
new_password, new_password_len,
cp->nt_response);
wpa_hexdump(MSG_DEBUG, "EAP-MSCHAPV2: NT-Response",
cp->nt_response, MSCHAPV2_NT_RESPONSE_LEN);
/* Authenticator response is not really needed yet, but calculate it
* here so that challenges need not be saved. */
generate_authenticator_response(new_password, new_password_len,
cp->peer_challenge,
data->passwd_change_challenge,
username, username_len,
cp->nt_response, data->auth_response);
data->auth_response_valid = 1;
/* Likewise, generate master_key here since we have the needed data
* available. */
nt_password_hash(new_password, new_password_len, password_hash);
hash_nt_password_hash(password_hash, password_hash_hash);
get_master_key(password_hash_hash, cp->nt_response, data->master_key);
data->master_key_valid = 1;
/* Flags */
os_memset(cp->flags, 0, 2);
wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: TX identifier %d mschapv2_id %d "
"(change pw)", id, ms->mschapv2_id);
return resp;
fail:
wpabuf_free(resp);
return NULL;
}
