eap_ttls.c

WLAN无线网络管理的最新程序

	return 0;
}


static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
					struct eap_ttls_data *data,
					struct eap_method_ret *ret,
					u8 **resp, size_t *resp_len)
{
	struct wpa_ssid *config = eap_get_config(sm);
	u8 *buf, *pos, *challenge;
	const u8 *addr[3];
	size_t len[3];

	wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");

	pos = buf = os_malloc(config->identity_len + 1000);
	if (buf == NULL) {
		wpa_printf(MSG_ERROR,
			   "EAP-TTLS/CHAP: Failed to allocate memory");
		return -1;
	}

	/* User-Name */
	pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
			       config->identity, config->identity_len);

	/* CHAP-Challenge */
	challenge = eap_ttls_implicit_challenge(sm, data, EAP_TLS_KEY_LEN);
	if (challenge == NULL) {
		os_free(buf);
		wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
			   "implicit challenge");
		return -1;
	}

	pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
			       challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);

	/* CHAP-Password */
	pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
			       1 + EAP_TTLS_CHAP_PASSWORD_LEN);
	data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
	*pos++ = data->ident;

	/* MD5(Ident + Password + Challenge) */
	addr[0] = &data->ident;
	len[0] = 1;
	addr[1] = config->password;
	len[1] = config->password_len;
	addr[2] = challenge;
	len[2] = EAP_TTLS_CHAP_CHALLENGE_LEN;
	md5_vector(3, addr, len, pos);

	wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
			  config->identity, config->identity_len);
	wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
			      config->password, config->password_len);
	wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
		    challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
	wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
		    pos, EAP_TTLS_CHAP_PASSWORD_LEN);
	pos += EAP_TTLS_CHAP_PASSWORD_LEN;
	os_free(challenge);
	AVP_PAD(buf, pos);

	*resp = buf;
	*resp_len = pos - buf;

	if (data->ttls_version > 0) {
		/* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
		 * so do not allow connection to be terminated yet. */
		ret->methodState = METHOD_CONT;
		ret->decision = DECISION_COND_SUCC;
	} else {
		/* EAP-TTLS/CHAP does not provide tunneled success
		 * notification, so assume that Phase2 succeeds. */
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_COND_SUCC;
	}

	return 0;
}


static int eap_ttls_phase2_request(struct eap_sm *sm,
				   struct eap_ttls_data *data,
				   struct eap_method_ret *ret,
				   const struct eap_hdr *req,
				   struct eap_hdr *hdr,
				   u8 **resp, size_t *resp_len)
{
	int res = 0;
	size_t len;

	if (data->phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
	    data->phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
	    data->phase2_type == EAP_TTLS_PHASE2_PAP ||
	    data->phase2_type == EAP_TTLS_PHASE2_CHAP) {
		if (eap_get_config_identity(sm, &len) == NULL) {
			wpa_printf(MSG_INFO,
				   "EAP-TTLS: Identity not configured");
			eap_sm_request_identity(sm);
			if (eap_get_config_password(sm, &len) == NULL)
				eap_sm_request_password(sm);
			return 0;
		}

		if (eap_get_config_password(sm, &len) == NULL) {
			wpa_printf(MSG_INFO,
				   "EAP-TTLS: Password not configured");
			eap_sm_request_password(sm);
			return 0;
		}
	}

	switch (data->phase2_type) {
	case EAP_TTLS_PHASE2_EAP:
		res = eap_ttls_phase2_request_eap(sm, data, ret, hdr,
						  resp, resp_len);
		break;
	case EAP_TTLS_PHASE2_MSCHAPV2:
		res = eap_ttls_phase2_request_mschapv2(sm, data, ret,
						       resp, resp_len);
		break;
	case EAP_TTLS_PHASE2_MSCHAP:
		res = eap_ttls_phase2_request_mschap(sm, data, ret,
						     resp, resp_len);
		break;
	case EAP_TTLS_PHASE2_PAP:
		res = eap_ttls_phase2_request_pap(sm, data, ret,
						  resp, resp_len);
		break;
	case EAP_TTLS_PHASE2_CHAP:
		res = eap_ttls_phase2_request_chap(sm, data, ret,
						   resp, resp_len);
		break;
	default:
		wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
		res = -1;
		break;
	}

	if (res < 0) {
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
	}

	return res;
}


static u8 * eap_ttls_build_phase_finished(struct eap_sm *sm,
					  struct eap_ttls_data *data,
					  int id, int final,
					  size_t *reqDataLen)
{
	int len;
	struct eap_hdr *req;
	u8 *pos;
	const int max_len = 300;

	len = sizeof(struct eap_hdr) + 2 + max_len;
	req = os_malloc(len);
	if (req == NULL)
		return NULL;

	req->code = EAP_CODE_RESPONSE;
	req->identifier = id;

	pos = (u8 *) (req + 1);
	*pos++ = EAP_TYPE_TTLS;
	*pos++ = data->ttls_version;

	len = tls_connection_ia_send_phase_finished(sm->ssl_ctx,
						    data->ssl.conn,
						    final, pos, max_len);
	if (len < 0) {
		os_free(req);
		return NULL;
	}

	*reqDataLen = sizeof(struct eap_hdr) + 2 + len;
	req->length = host_to_be16(*reqDataLen);

	return (u8 *) req;
}


static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
			    struct eap_method_ret *ret,
			    const struct eap_hdr *req,
			    const u8 *in_data, size_t in_len,
			    u8 **out_data, size_t *out_len)
{
	u8 *in_decrypted = NULL, *pos;
	int res, retval = 0;
	struct eap_hdr *hdr = NULL;
	u8 *resp = NULL, *mschapv2 = NULL, *eapdata = NULL;
	size_t resp_len, eap_len = 0, len_decrypted = 0, len, buf_len, left;
	struct ttls_avp *avp;
	u8 recv_response[20];
	int mschapv2_error = 0;
	struct wpa_ssid *config = eap_get_config(sm);
	const u8 *msg;
	size_t msg_len;
	int need_more_input;

	wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
		   " Phase 2", (unsigned long) in_len);

	if (data->pending_phase2_req) {
		wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
			   "skip decryption and use old data");
		/* Clear TLS reassembly state. */
		os_free(data->ssl.tls_in);
		data->ssl.tls_in = NULL;
		data->ssl.tls_in_len = 0;
		data->ssl.tls_in_left = 0;
		data->ssl.tls_in_total = 0;

		in_decrypted = data->pending_phase2_req;
		data->pending_phase2_req = NULL;
		len_decrypted = data->pending_phase2_req_len;
		if (data->pending_phase2_req_len == 0) {
			os_free(in_decrypted);
			in_decrypted = NULL;
			goto fake_req_identity;
		}
		goto continue_req;
	}

	if (in_len == 0 && data->phase2_start) {
		data->phase2_start = 0;
		/* EAP-TTLS does not use Phase2 on fast re-auth; this must be
		 * done only if TLS part was indeed resuming a previous
		 * session. Most Authentication Servers terminate EAP-TTLS
		 * before reaching this point, but some do not. Make
		 * wpa_supplicant stop phase 2 here, if needed. */
		if (data->reauth &&
		    tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
			wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
				   "skip phase 2");
			*out_data = eap_tls_build_ack(&data->ssl, out_len,
						      req->identifier,
						      EAP_TYPE_TTLS, 0);
			ret->methodState = METHOD_DONE;
			ret->decision = DECISION_UNCOND_SUCC;
			data->phase2_success = 1;
			return 0;
		}
	fake_req_identity:
		wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
			   "Phase 2 - use fake EAP-Request Identity");
		buf_len = sizeof(*hdr) + 1;
		in_decrypted = os_malloc(buf_len);
		if (in_decrypted == NULL) {
			wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
				   "memory for fake EAP-Identity Request");
			retval = -1;
			goto done;
		}
		hdr = (struct eap_hdr *) in_decrypted;
		hdr->code = EAP_CODE_REQUEST;
		hdr->identifier = 0;
		hdr->length = host_to_be16(sizeof(*hdr) + 1);
		in_decrypted[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
		goto process_eap;
	}

	msg = eap_tls_data_reassemble(sm, &data->ssl, in_data, in_len,
				      &msg_len, &need_more_input);
	if (msg == NULL)
		return need_more_input ? 1 : -1;

	buf_len = in_len;
	if (data->ssl.tls_in_total > buf_len)
		buf_len = data->ssl.tls_in_total;
	in_decrypted = os_malloc(buf_len);
	if (in_decrypted == NULL) {
		os_free(data->ssl.tls_in);
		data->ssl.tls_in = NULL;
		data->ssl.tls_in_len = 0;
		wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate memory "
			   "for decryption");
		retval = -1;
		goto done;
	}

	res = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
				     msg, msg_len, in_decrypted, buf_len);
	os_free(data->ssl.tls_in);
	data->ssl.tls_in = NULL;
	data->ssl.tls_in_len = 0;
	if (res < 0) {
		wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 "
			   "data");
		retval = -1;
		goto done;
	}
	len_decrypted = res;

	if (data->ttls_version > 0 && len_decrypted == 0 &&
	    tls_connection_ia_final_phase_finished(sm->ssl_ctx,
						   data->ssl.conn)) {
		wpa_printf(MSG_DEBUG, "EAP-TTLS: FinalPhaseFinished received");
		wpa_printf(MSG_INFO, "EAP-TTLS: TLS/IA authentication "
			   "succeeded");
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_UNCOND_SUCC;
		data->phase2_success = 1;
		*out_data = eap_ttls_build_phase_finished(sm, data,
							  req->identifier, 1,
							  out_len);
		eap_ttls_v1_derive_key(sm, data);
		goto done;
	}

continue_req:
	data->phase2_start = 0;

	wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs",
		    in_decrypted, len_decrypted);
	if (len_decrypted < sizeof(struct ttls_avp)) {
		wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
			   " len=%lu expected %lu or more - dropped",
			   (unsigned long) len_decrypted,
			   (unsigned long) sizeof(struct ttls_avp));
		retval = -1;
		goto done;
	}

	/* Parse AVPs */
	pos = in_decrypted;
	left = len_decrypted;
	mschapv2 = NULL;

	while (left > 0) {
		u32 avp_code, avp_length, vendor_id = 0;
		u8 avp_flags, *dpos;
		size_t pad, dlen;
		avp = (struct ttls_avp *) pos;
		avp_code = be_to_host32(avp->avp_code);
		avp_length = be_to_host32(avp->avp_length);
		avp_flags = (avp_length >> 24) & 0xff;
		avp_length &= 0xffffff;
		wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
			   "length=%d", (int) avp_code, avp_flags,
			   (int) avp_length);
		if (avp_length > left) {
			wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
				   "(len=%d, left=%lu) - dropped",
				   (int) avp_length, (unsigned long) left);
			retval = -1;
			goto done;
		}
		if (avp_length < sizeof(*avp)) {
			wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length "
				   "%d", avp_length);
			retval = -1;
			goto done;
		}
		dpos = (u8 *) (avp + 1);
		dlen = avp_length - sizeof(*avp);
		if (avp_flags & AVP_FLAGS_VENDOR) {
			if (dlen < 4) {
				wpa_printf(MSG_WARNING, "EAP-TTLS: vendor AVP "
					   "underflow");
				retval = -1;
				goto done;
			}
			vendor_id = be_to_host32(* (u32 *) dpos);
			wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
				   (int) vendor_id);
			dpos += 4;
			dlen -= 4;
		}

		wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);

		if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
			wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
			if (eapdata == NULL) {
				eapdata = os_malloc(dlen);
				if (eapdata == NULL) {
					retval = -1;
					wpa_printf(MSG_WARNING, "EAP-TTLS: "
						   "failed to allocate memory "
						   "for Phase 2 EAP data");
					goto done;
				}
				os_memcpy(eapdata, dpos, dlen);
				eap_len = dlen;
			} else {
				u8 *neweap = os_realloc(eapdata,
							eap_len + dlen);
				if (neweap == NULL) {
					retval = -1;
					wpa_printf(MSG_WARNING, "EAP-TTLS: "
						   "failed to allocate memory "
						   "for Phase 2 EAP data");
					goto done;
				}
				os_memcpy(neweap + eap_len, dpos, dlen);
				eapdata = neweap;
				eap_len += dlen;
			}
		} else if (vendor_id == 0 &&
			   avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
			/* This is an optional message that can be displayed to
			 * the user. */
			wpa_hexdump_ascii(MSG_DEBUG,
					  "EAP-TTLS: AVP - Reply-Message",
					  dpos, dlen);
		} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
			   avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
			wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: "
					  "MS-CHAP2-Success", dpos, dlen);
			if (dlen != 43) {
				wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
					   "MS-CHAP2-Success length "
					   "(len=%lu, expected 43)",
					   (unsigned long) dlen);
				retval = -1;
				break;
			}
			mschapv2 = dpos;
		} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
			   avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
			wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: "
					  "MS-CHAP-Error", dpos, dlen);
			mschapv2_error = 1;
		} else if (avp_flags & AVP_FLAGS_MANDATORY) {
			wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported "
				   "mandatory AVP code %d vendor_id %d - "
				   "dropped", (int) avp_code, (int) vendor_id);
			retval = -1;
			goto done;
		} else {