/*
* UPnP WPS Device - Web connections
* Copyright (c) 2000-2003 Intel Corporation
* Copyright (c) 2006-2007 Sony Corporation
* Copyright (c) 2008-2009 Atheros Communications
* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
*
* See wps_upnp.c for more details on licensing and code history.
*/
#include "includes.h"
#include "common.h"
#include "base64.h"
#include "uuid.h"
#include "httpread.h"
#include "http_server.h"
#include "wps_i.h"
#include "wps_upnp.h"
#include "wps_upnp_i.h"
#include "upnp_xml.h"
/***************************************************************************
* Web connections (we serve pages of info about ourselves, handle
* requests, etc. etc.).
**************************************************************************/
#define WEB_CONNECTION_TIMEOUT_SEC 30 /* Drop web connection after t.o. */
#define WEB_CONNECTION_MAX_READ 8000 /* Max we'll read for TCP request */
#define MAX_WEB_CONNECTIONS 10 /* max simultaneous web connects */
static const char *urn_wfawlanconfig =
"urn:schemas-wifialliance-org:service:WFAWLANConfig:1";
static const char *http_server_hdr =
"Server: unspecified, UPnP/1.0, unspecified\r\n";
static const char *http_connection_close =
"Connection: close\r\n";
/*
* "Files" that we serve via HTTP. The format of these files is given by
* WFA WPS specifications. Extra white space has been removed to save space.
*/
static const char wps_scpd_xml[] =
"<?xml version=\"1.0\"?>\n"
"<scpd xmlns=\"urn:schemas-upnp-org:service-1-0\">\n"
"<specVersion><major>1</major><minor>0</minor></specVersion>\n"
"<actionList>\n"
"<action>\n"
"<name>GetDeviceInfo</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewDeviceInfo</name>\n"
"<direction>out</direction>\n"
"<relatedStateVariable>DeviceInfo</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>PutMessage</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewInMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>InMessage</relatedStateVariable>\n"
"</argument>\n"
"<argument>\n"
"<name>NewOutMessage</name>\n"
"<direction>out</direction>\n"
"<relatedStateVariable>OutMessage</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>PutWLANResponse</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>Message</relatedStateVariable>\n"
"</argument>\n"
"<argument>\n"
"<name>NewWLANEventType</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>WLANEventType</relatedStateVariable>\n"
"</argument>\n"
"<argument>\n"
"<name>NewWLANEventMAC</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>WLANEventMAC</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>SetSelectedRegistrar</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>Message</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"</actionList>\n"
"<serviceStateTable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>Message</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>InMessage</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>OutMessage</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>DeviceInfo</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"yes\">\n"
"<name>APStatus</name>\n"
"<dataType>ui1</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"yes\">\n"
"<name>STAStatus</name>\n"
"<dataType>ui1</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"yes\">\n"
"<name>WLANEvent</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>WLANEventType</name>\n"
"<dataType>ui1</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>WLANEventMAC</name>\n"
"<dataType>string</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>WLANResponse</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"</serviceStateTable>\n"
"</scpd>\n"
;
static const char *wps_device_xml_prefix =
"<?xml version=\"1.0\"?>\n"
"<root xmlns=\"urn:schemas-upnp-org:device-1-0\">\n"
"<specVersion>\n"
"<major>1</major>\n"
"<minor>0</minor>\n"
"</specVersion>\n"
"<device>\n"
"<deviceType>urn:schemas-wifialliance-org:device:WFADevice:1"
"</deviceType>\n";
static const char *wps_device_xml_postfix =
"<serviceList>\n"
"<service>\n"
"<serviceType>urn:schemas-wifialliance-org:service:WFAWLANConfig:1"
"</serviceType>\n"
"<serviceId>urn:wifialliance-org:serviceId:WFAWLANConfig1</serviceId>"
"\n"
"<SCPDURL>" UPNP_WPS_SCPD_XML_FILE "</SCPDURL>\n"
"<controlURL>" UPNP_WPS_DEVICE_CONTROL_FILE "</controlURL>\n"
"<eventSubURL>" UPNP_WPS_DEVICE_EVENT_FILE "</eventSubURL>\n"
"</service>\n"
"</serviceList>\n"
"</device>\n"
"</root>\n";
/* format_wps_device_xml -- produce content of "file" wps_device.xml
* (UPNP_WPS_DEVICE_XML_FILE)
*/
static void format_wps_device_xml(struct upnp_wps_device_interface *iface,
struct upnp_wps_device_sm *sm,
struct wpabuf *buf)
{
const char *s;
char uuid_string[80];
wpabuf_put_str(buf, wps_device_xml_prefix);
/*
* Add required fields with default values if not configured. Add
* optional and recommended fields only if configured.
*/
s = iface->wps->friendly_name;
s = ((s && *s) ? s : "WPS Access Point");
xml_add_tagged_data(buf, "friendlyName", s);
s = iface->wps->dev.manufacturer;
s = ((s && *s) ? s : "");
xml_add_tagged_data(buf, "manufacturer", s);
if (iface->wps->manufacturer_url)
xml_add_tagged_data(buf, "manufacturerURL",
iface->wps->manufacturer_url);
if (iface->wps->model_description)
xml_add_tagged_data(buf, "modelDescription",
iface->wps->model_description);
s = iface->wps->dev.model_name;
s = ((s && *s) ? s : "");
xml_add_tagged_data(buf, "modelName", s);
if (iface->wps->dev.model_number)
xml_add_tagged_data(buf, "modelNumber",
iface->wps->dev.model_number);
if (iface->wps->model_url)
xml_add_tagged_data(buf, "modelURL", iface->wps->model_url);
if (iface->wps->dev.serial_number)
xml_add_tagged_data(buf, "serialNumber",
iface->wps->dev.serial_number);
uuid_bin2str(iface->wps->uuid, uuid_string, sizeof(uuid_string));
s = uuid_string;
/* Need "uuid:" prefix, thus we can't use xml_add_tagged_data()
* easily...
*/
wpabuf_put_str(buf, "<UDN>uuid:");
xml_data_encode(buf, s, os_strlen(s));
wpabuf_put_str(buf, "</UDN>\n");
if (iface->wps->upc)
xml_add_tagged_data(buf, "UPC", iface->wps->upc);
wpabuf_put_str(buf, wps_device_xml_postfix);
}
static void http_put_reply_code(struct wpabuf *buf, enum http_reply_code code)
{
wpabuf_put_str(buf, "HTTP/1.1 ");
switch (code) {
case HTTP_OK:
wpabuf_put_str(buf, "200 OK\r\n");
break;
case HTTP_BAD_REQUEST:
wpabuf_put_str(buf, "400 Bad request\r\n");
break;
case HTTP_PRECONDITION_FAILED:
wpabuf_put_str(buf, "412 Precondition failed\r\n");
break;
case HTTP_UNIMPLEMENTED:
wpabuf_put_str(buf, "501 Unimplemented\r\n");
break;
case HTTP_INTERNAL_SERVER_ERROR:
default:
wpabuf_put_str(buf, "500 Internal server error\r\n");
break;
}
}
static void http_put_date(struct wpabuf *buf)
{
wpabuf_put_str(buf, "Date: ");
format_date(buf);
wpabuf_put_str(buf, "\r\n");
}
static void http_put_empty(struct wpabuf *buf, enum http_reply_code code)
{
http_put_reply_code(buf, code);
wpabuf_put_str(buf, http_server_hdr);
wpabuf_put_str(buf, http_connection_close);
wpabuf_put_str(buf, "Content-Length: 0\r\n"
"\r\n");
}
/* Given that we have received a header w/ GET, act upon it
*
* Format of GET (case-insensitive):
*
* First line must be:
* GET /<file> HTTP/1.1
* Since we don't do anything fancy we just ignore other lines.
*
* Our response (if no error) which includes only required lines is:
* HTTP/1.1 200 OK
* Connection: close
* Content-Type: text/xml
* Date: <rfc1123-date>
*
* Header lines must end with \r\n
* Per RFC 2616, content-length: is not required but connection:close
* would appear to be required (given that we will be closing it!).
*/
static void web_connection_parse_get(struct upnp_wps_device_sm *sm,
struct http_request *hreq, char *filename)
{
struct wpabuf *buf; /* output buffer, allocated */
char *put_length_here;
char *body_start;
enum {
GET_DEVICE_XML_FILE,
GET_SCPD_XML_FILE
} req;
size_t extra_len = 0;
int body_length;
char len_buf[10];
struct upnp_wps_device_interface *iface;
iface = dl_list_first(&sm->interfaces,
struct upnp_wps_device_interface, list);
if (iface == NULL) {
http_request_deinit(hreq);
return;
}
/*
* It is not required that filenames be case insensitive but it is
* allowed and cannot hurt here.
*/
if (os_strcasecmp(filename, UPNP_WPS_DEVICE_XML_FILE) == 0) {
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP GET for device XML");
req = GET_DEVICE_XML_FILE;
extra_len = 3000;
if (iface->wps->friendly_name)
extra_len += os_strlen(iface->wps->friendly_name);
if (iface->wps->manufacturer_url)
extra_len += os_strlen(iface->wps->manufacturer_url);
if (iface->wps->model_description)
extra_len += os_strlen(iface->wps->model_description);
if (iface->wps->model_url)
extra_len += os_strlen(iface->wps->model_url);
if (iface->wps->upc)
extra_len += os_strlen(iface->wps->upc);
} else if (!os_strcasecmp(filename, UPNP_WPS_SCPD_XML_FILE)) {
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP GET for SCPD XML");
req = GET_SCPD_XML_FILE;
extra_len = os_strlen(wps_scpd_xml);
} else {
/* File not found */
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP GET file not found: %s",
filename);
buf = wpabuf_alloc(200);
if (buf == NULL) {
http_request_deinit(hreq);
return;
}
wpabuf_put_str(buf,
"HTTP/1.1 404 Not Found\r\n"
"Connection: close\r\n");
http_put_date(buf);
/* terminating empty line */
wpabuf_put_str(buf, "\r\n");
goto send_buf;
}
buf = wpabuf_alloc(1000 + extra_len);
if (buf == NULL) {
http_request_deinit(hreq);
return;
}
wpabuf_put_str(buf,
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/xml; charset=\"utf-8\"\r\n");
wpabuf_put_str(buf, "Server: Unspecified, UPnP/1.0, Unspecified\r\n");
wpabuf_put_str(buf, "Connection: close\r\n");
wpabuf_put_str(buf, "Content-Length: ");
/*
* We will paste the length in later, leaving some extra whitespace.
* HTTP code is supposed to be tolerant of extra whitespace.
*/
put_length_here = wpabuf_put(buf, 0);
wpabuf_put_str(buf, " \r\n");
http_put_date(buf);
/* terminating empty line */
wpabuf_put_str(buf, "\r\n");
body_start = wpabuf_put(buf, 0);
switch (req) {
case GET_DEVICE_XML_FILE:
format_wps_device_xml(iface, sm, buf);
break;
case GET_SCPD_XML_FILE:
wpabuf_put_str(buf, wps_scpd_xml);
break;
}
/* Now patch in the content length at the end */
body_length = (char *) wpabuf_put(buf, 0) - body_start;
os_snprintf(len_buf, 10, "%d", body_length);
os_memcpy(put_length_here, len_buf, os_strlen(len_buf));
send_buf:
http_request_send_and_deinit(hreq, buf);
}
static enum http_reply_code
web_process_get_device_info(struct upnp_wps_device_sm *sm,
struct wpabuf **reply, const char **replyname)
{
static const char *name = "NewDeviceInfo";
struct wps_config cfg;
struct upnp_wps_device_interface *iface;
struct upnp_wps_peer *peer;
iface = dl_list_first(&sm->interfaces,
struct upnp_wps_device_interface, list);
wpa_printf(MSG_DEBUG, "WPS UPnP: GetDeviceInfo");
if (!iface || iface->ctx->ap_pin == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
peer = &iface->peer;
/*
* Request for DeviceInfo, i.e., M1 TLVs. This is a start of WPS
* registration over UPnP with the AP acting as an Enrollee. It should
* be noted that this is frequently used just to get the device data,
* i.e., there may not be any intent to actually complete the
* registration.
*/
if (peer->wps)
wps_deinit(peer->wps);
os_memset(&cfg, 0, sizeof(cfg));
cfg.wps = iface->wps;
cfg.pin = (u8 *) iface->ctx->ap_pin;
cfg.pin_len = os_strlen(iface->ctx->ap_pin);
peer->wps = wps_init(&cfg);
if (peer->wps) {
enum wsc_op_code op_code;
*reply = wps_get_msg(peer->wps, &op_code);
if (*reply == NULL) {
wps_deinit(peer->wps);
peer->wps = NULL;
}
} else
*reply = NULL;
if (*reply == NULL) {
wpa_printf(MSG_INFO, "WPS UPnP: Failed to get DeviceInfo");
return HTTP_INTERNAL_SERVER_ERROR;
}
*replyname = name;
return HTTP_OK;
}
static enum http_reply_code
web_process_put_message(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
static const char *name = "NewOutMessage";
enum http_reply_code ret;
enum wps_process_res res;
enum wsc_op_code op_code;
struct upnp_wps_device_interface *iface;
iface = dl_list_first(&sm->interfaces,
struct upnp_wps_device_interface, list);
if (!iface)
return HTTP_INTERNAL_SERVER_ERROR;
/*
* PutMessage is used by external UPnP-based Registrar to perform WPS
* operation with the access point itself; as compared with
* PutWLANResponse which is for proxying.
*/
wpa_printf(MSG_DEBUG, "WPS UPnP: PutMessage");
msg = xml_get_base64_item(data, "NewInMessage", &ret);
if (msg == NULL)
return ret;
res = wps_process_msg(iface->peer.wps, WSC_UPnP, msg);
if (res == WPS_FAILURE)
*reply = NULL;
else
*reply = wps_get_msg(iface->peer.wps, &op_code);
wpabuf_free(msg);
if (*reply == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
*replyname = name;
return HTTP_OK;
}
static enum http_reply_code
web_process_put_wlan_response(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
u8 macaddr[ETH_ALEN];
int ev_type;
int type;
char *val;
struct upnp_wps_device_interface *iface;
int ok = 0;
/*
* External UPnP-based Registrar is passing us a message to be proxied
* over to a Wi-Fi -based client of ours.
*/
wpa_printf(MSG_DEBUG, "WPS UPnP: PutWLANResponse");
msg = xml_get_base64_item(data, "NewMessage", &ret);
if (msg == NULL) {
wpa_printf(MSG_DEBUG, "WPS UPnP: Could not extract NewMessage "
"from PutWLANResponse");
return ret;
}
val = xml_get_first_item(data, "NewWLANEventType");
if (val == NULL) {
wpa_printf(MSG_DEBUG, "WPS UPnP: No NewWLANEventType in "
"PutWLANResponse");
wpabuf_free(msg);
return UPNP_ARG_VALUE_INVALID;
}
ev_type = atol(val);
os_free(val);
val = xml_get_first_item(data, "NewWLANEventMAC");
if (val == NULL) {
wpa_printf(MSG_DEBUG, "WPS UPnP: No NewWLANEventMAC in "
"PutWLANResponse");
wpabuf_free(msg);
return UPNP_ARG_VALUE_INVALID;
}
if (hwaddr_aton(val, macaddr)) {
wpa_printf(MSG_DEBUG, "WPS UPnP: Invalid NewWLANEventMAC in "
"PutWLANResponse: '%s'", val);
#ifdef CONFIG_WPS_STRICT
{
struct wps_parse_attr attr;
if (wps_parse_msg(msg, &attr) < 0 || attr.version2) {
wpabuf_free(msg);
os_free(val);
return UPNP_ARG_VALUE_INVALID;
}
}
#endif /* CONFIG_WPS_STRICT */
if (hwaddr_aton2(val, macaddr) > 0) {
/*
* At least some versions of Intel PROset seem to be
* using dot-deliminated MAC address format here.
*/
wpa_printf(MSG_DEBUG, "WPS UPnP: Workaround - allow "
"incorrect MAC address format in "
"NewWLANEventMAC: %s -> " MACSTR,
val, MAC2STR(macaddr));
} else {
wpabuf_free(msg);
os_free(val);
return UPNP_ARG_VALUE_INVALID;
}
}
os_free(val);
if (ev_type == UPNP_WPS_WLANEVENT_TYPE_EAP) {
struct wps_parse_attr attr;
if (wps_parse_msg(msg, &attr) < 0 ||
attr.msg_type == NULL)
type = -1;
else
type = *attr.msg_type;
wpa_printf(MSG_DEBUG, "WPS UPnP: Message Type %d", type);
} else
type = -1;
dl_list_for_each(iface, &sm->interfaces,
struct upnp_wps_device_interface, list) {
if (iface->ctx->rx_req_put_wlan_response &&
iface->ctx->rx_req_put_wlan_response(iface->priv, ev_type,
macaddr, msg, type)
== 0)
ok = 1;
}
if (!ok) {
wpa_printf(MSG_INFO, "WPS UPnP: Fail: sm->ctx->"
"rx_req_put_wlan_response");
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static int find_er_addr(struct subscription *s, struct sockaddr_in *cli)
{
struct subscr_addr *a;
dl_list_for_each(a, &s->addr_list, struct subscr_addr, list) {
if (cli->sin_addr.s_addr == a->saddr.sin_addr.s_addr)
return 1;
}
return 0;
}
static struct subscription * find_er(struct upnp_wps_device_sm *sm,
struct sockaddr_in *cli)
{
struct subscription *s;
dl_list_for_each(s, &sm->subscriptions, struct subscription, list)
if (find_er_addr(s, cli))
return s;
return NULL;
}
static enum http_reply_code
web_process_set_selected_registrar(struct upnp_wps_device_sm *sm,
struct sockaddr_in *cli, char *data,
struct wpabuf **reply,
const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
struct subscription *s;
struct upnp_wps_device_interface *iface;
int err = 0;
wpa_printf(MSG_DEBUG, "WPS UPnP: SetSelectedRegistrar");
s = find_er(sm, cli);
if (s == NULL) {
wpa_printf(MSG_DEBUG, "WPS UPnP: Ignore SetSelectedRegistrar "
"from unknown ER");
return UPNP_ACTION_FAILED;
}
msg = xml_get_base64_item(data, "NewMessage", &ret);
if (msg == NULL)
return ret;
dl_list_for_each(iface, &sm->interfaces,
struct upnp_wps_device_interface, list) {
if (upnp_er_set_selected_registrar(iface->wps->registrar, s,
msg))
err = 1;
}
wpabuf_free(msg);
if (err)
return HTTP_INTERNAL_SERVER_ERROR;
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static const char *soap_prefix =
"<?xml version=\"1.0\"?>\n"
"<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\" "
"s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">\n"
"<s:Body>\n";
static const char *soap_postfix =
"</s:Body>\n</s:Envelope>\n";
static const char *soap_error_prefix =
"<s:Fault>\n"
"<faultcode>s:Client</faultcode>\n"
"<faultstring>UPnPError</faultstring>\n"
"<detail>\n"
"<UPnPError xmlns=\"urn:schemas-upnp-org:control-1-0\">\n";
static const char *soap_error_postfix =
"<errorDescription>Error</errorDescription>\n"
"</UPnPError>\n"
"</detail>\n"
"</s:Fault>\n";
static void web_connection_send_reply(struct http_request *req,
enum http_reply_code ret,
const char *action, int action_len,
const struct wpabuf *reply,
const char *replyname)
{
struct wpabuf *buf;
char *replydata;
char *put_length_here = NULL;
char *body_start = NULL;
if (reply) {
size_t len;
replydata = (char *) base64_encode(wpabuf_head(reply),
wpabuf_len(reply), &len);
} else
replydata = NULL;
/* Parameters of the response:
* action(action_len) -- action we are responding to
* replyname -- a name we need for the reply
* replydata -- NULL or null-terminated string
*/
buf = wpabuf_alloc(1000 + (replydata ? os_strlen(replydata) : 0U) +
(action_len > 0 ? action_len * 2 : 0));
if (buf == NULL) {
wpa_printf(MSG_INFO, "WPS UPnP: Cannot allocate reply to "
"POST");
os_free(replydata);
http_request_deinit(req);
return;
}
/*
* Assuming we will be successful, put in the output header first.
* Note: we do not keep connections alive (and httpread does
* not support it)... therefore we must have Connection: close.
*/
if (ret == HTTP_OK) {
wpabuf_put_str(buf,
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/xml; "
"charset=\"utf-8\"\r\n");
} else {
wpabuf_printf(buf, "HTTP/1.1 %d Error\r\n", ret);
}
wpabuf_put_str(buf, http_connection_close);
wpabuf_put_str(buf, "Content-Length: ");
/*
* We will paste the length in later, leaving some extra whitespace.
* HTTP code is supposed to be tolerant of extra whitespace.
*/
put_length_here = wpabuf_put(buf, 0);
wpabuf_put_str(buf, " \r\n");
http_put_date(buf);
/* terminating empty line */
wpabuf_put_str(buf, "\r\n");
body_start = wpabuf_put(buf, 0);
if (ret == HTTP_OK) {
wpabuf_put_str(buf, soap_prefix);
wpabuf_put_str(buf, "<u:");
wpabuf_put_data(buf, action, action_len);
wpabuf_put_str(buf, "Response xmlns:u=\"");
wpabuf_put_str(buf, urn_wfawlanconfig);
wpabuf_put_str(buf, "\">\n");
if (replydata && replyname) {
/* TODO: might possibly need to escape part of reply
* data? ...
* probably not, unlikely to have ampersand(&) or left
* angle bracket (<) in it...
*/
wpabuf_printf(buf, "<%s>", replyname);
wpabuf_put_str(buf, replydata);
wpabuf_printf(buf, "</%s>\n", replyname);
}
wpabuf_put_str(buf, "</u:");
wpabuf_put_data(buf, action, action_len);
wpabuf_put_str(buf, "Response>\n");
wpabuf_put_str(buf, soap_postfix);
} else {
/* Error case */
wpabuf_put_str(buf, soap_prefix);
wpabuf_put_str(buf, soap_error_prefix);
wpabuf_printf(buf, "<errorCode>%d</errorCode>\n", ret);
wpabuf_put_str(buf, soap_error_postfix);
wpabuf_put_str(buf, soap_postfix);
}
os_free(replydata);
/* Now patch in the content length at the end */
if (body_start && put_length_here) {
int body_length = (char *) wpabuf_put(buf, 0) - body_start;
char len_buf[10];
os_snprintf(len_buf, sizeof(len_buf), "%d", body_length);
os_memcpy(put_length_here, len_buf, os_strlen(len_buf));
}
http_request_send_and_deinit(req, buf);
}
static const char * web_get_action(struct http_request *req,
size_t *action_len)
{
const char *match;
int match_len;
char *b;
char *action;
*action_len = 0;
/* The SOAPAction line of the header tells us what we want to do */
b = http_request_get_hdr_line(req, "SOAPAction:");
if (b == NULL)
return NULL;
if (*b == '"')
b++;
else
return NULL;
match = urn_wfawlanconfig;
match_len = os_strlen(urn_wfawlanconfig) - 1;
if (os_strncasecmp(b, match, match_len))
return NULL;
b += match_len;
/* skip over version */
while (isgraph(*b) && *b != '#')
b++;
if (*b != '#')
return NULL;
b++;
/* Following the sharp(#) should be the action and a double quote */
action = b;
while (isgraph(*b) && *b != '"')
b++;
if (*b != '"')
return NULL;
*action_len = b - action;
return action;
}
/* Given that we have received a header w/ POST, act upon it
*
* Format of POST (case-insensitive):
*
* First line must be:
* POST /<file> HTTP/1.1
* Since we don't do anything fancy we just ignore other lines.
*
* Our response (if no error) which includes only required lines is:
* HTTP/1.1 200 OK
* Connection: close
* Content-Type: text/xml
* Date: <rfc1123-date>
*
* Header lines must end with \r\n
* Per RFC 2616, content-length: is not required but connection:close
* would appear to be required (given that we will be closing it!).
*/
static void web_connection_parse_post(struct upnp_wps_device_sm *sm,
struct sockaddr_in *cli,
struct http_request *req,
const char *filename)
{
enum http_reply_code ret;
char *data = http_request_get_data(req); /* body of http msg */
const char *action = NULL;
size_t action_len = 0;
const char *replyname = NULL; /* argument name for the reply */
struct wpabuf *reply = NULL; /* data for the reply */
if (os_strcasecmp(filename, UPNP_WPS_DEVICE_CONTROL_FILE)) {
wpa_printf(MSG_INFO, "WPS UPnP: Invalid POST filename %s",
filename);
ret = HTTP_NOT_FOUND;
goto bad;
}
ret = UPNP_INVALID_ACTION;
action = web_get_action(req, &action_len);
if (action == NULL)
goto bad;
if (!os_strncasecmp("GetDeviceInfo", action, action_len))
ret = web_process_get_device_info(sm, &reply, &replyname);
else if (!os_strncasecmp("PutMessage", action, action_len))
ret = web_process_put_message(sm, data, &reply, &replyname);
else if (!os_strncasecmp("PutWLANResponse", action, action_len))
ret = web_process_put_wlan_response(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("SetSelectedRegistrar", action, action_len))
ret = web_process_set_selected_registrar(sm, cli, data, &reply,
&replyname);
else
wpa_printf(MSG_INFO, "WPS UPnP: Unknown POST type");
bad:
if (ret != HTTP_OK)
wpa_printf(MSG_INFO, "WPS UPnP: POST failure ret=%d", ret);
web_connection_send_reply(req, ret, action, action_len, reply,
replyname);
wpabuf_free(reply);
}
/* Given that we have received a header w/ SUBSCRIBE, act upon it
*
* Format of SUBSCRIBE (case-insensitive):
*
* First line must be:
* SUBSCRIBE /wps_event HTTP/1.1
*
* Our response (if no error) which includes only required lines is:
* HTTP/1.1 200 OK
* Server: xx, UPnP/1.0, xx
* SID: uuid:xxxxxxxxx
* Timeout: Second-<n>
* Content-Length: 0
* Date: xxxx
*
* Header lines must end with \r\n
* Per RFC 2616, content-length: is not required but connection:close
* would appear to be required (given that we will be closing it!).
*/
static void web_connection_parse_subscribe(struct upnp_wps_device_sm *sm,
struct http_request *req,
const char *filename)
{
struct wpabuf *buf;
char *b;
char *hdr = http_request_get_hdr(req);
char *h;
char *match;
int match_len;
char *end;
int len;
int got_nt = 0;
u8 uuid[UUID_LEN];
int got_uuid = 0;
char *callback_urls = NULL;
struct subscription *s = NULL;
enum http_reply_code ret = HTTP_INTERNAL_SERVER_ERROR;
buf = wpabuf_alloc(1000);
if (buf == NULL) {
http_request_deinit(req);
return;
}
wpa_hexdump_ascii(MSG_DEBUG, "WPS UPnP: HTTP SUBSCRIBE",
(u8 *) hdr, os_strlen(hdr));
/* Parse/validate headers */
h = hdr;
/* First line: SUBSCRIBE /wps_event HTTP/1.1
* has already been parsed.
*/
if (os_strcasecmp(filename, UPNP_WPS_DEVICE_EVENT_FILE) != 0) {
ret = HTTP_PRECONDITION_FAILED;
goto error;
}
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP SUBSCRIBE for event");
end = os_strchr(h, '\n');
while (end) {
/* Option line by option line */
h = end + 1;
end = os_strchr(h, '\n');
if (end == NULL)
break; /* no unterminated lines allowed */
/* NT assures that it is our type of subscription;
* not used for a renewal.
**/
match = "NT:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
match = "upnp:event";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) != 0) {
ret = HTTP_BAD_REQUEST;
goto error;
}
got_nt = 1;
continue;
}
/* HOST should refer to us */
#if 0
match = "HOST:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
.....
}
#endif
/* CALLBACK gives one or more URLs for NOTIFYs
* to be sent as a result of the subscription.
* Each URL is enclosed in angle brackets.
*/
match = "CALLBACK:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
len = end - h;
os_free(callback_urls);
callback_urls = dup_binstr(h, len);
if (callback_urls == NULL) {
ret = HTTP_INTERNAL_SERVER_ERROR;
goto error;
}
continue;
}
/* SID is only for renewal */
match = "SID:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
match = "uuid:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) != 0) {
ret = HTTP_BAD_REQUEST;
goto error;
}
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
if (uuid_str2bin(h, uuid)) {
ret = HTTP_BAD_REQUEST;
goto error;
}
got_uuid = 1;
continue;
}
/* TIMEOUT is requested timeout, but apparently we can
* just ignore this.
*/
}
if (got_uuid) {
/* renewal */
wpa_printf(MSG_DEBUG, "WPS UPnP: Subscription renewal");
if (callback_urls) {
ret = HTTP_BAD_REQUEST;
goto error;
}
s = subscription_renew(sm, uuid);
if (s == NULL) {
char str[80];
uuid_bin2str(uuid, str, sizeof(str));
wpa_printf(MSG_DEBUG, "WPS UPnP: Could not find "
"SID %s", str);
ret = HTTP_PRECONDITION_FAILED;
goto error;
}
} else if (callback_urls) {
wpa_printf(MSG_DEBUG, "WPS UPnP: New subscription");
if (!got_nt) {
ret = HTTP_PRECONDITION_FAILED;
goto error;
}
s = subscription_start(sm, callback_urls);
if (s == NULL) {
ret = HTTP_INTERNAL_SERVER_ERROR;
goto error;
}
} else {
ret = HTTP_PRECONDITION_FAILED;
goto error;
}
/* success */
http_put_reply_code(buf, HTTP_OK);
wpabuf_put_str(buf, http_server_hdr);
wpabuf_put_str(buf, http_connection_close);
wpabuf_put_str(buf, "Content-Length: 0\r\n");
wpabuf_put_str(buf, "SID: uuid:");
/* subscription id */
b = wpabuf_put(buf, 0);
uuid_bin2str(s->uuid, b, 80);
wpa_printf(MSG_DEBUG, "WPS UPnP: Assigned SID %s", b);
wpabuf_put(buf, os_strlen(b));
wpabuf_put_str(buf, "\r\n");
wpabuf_printf(buf, "Timeout: Second-%d\r\n", UPNP_SUBSCRIBE_SEC);
http_put_date(buf);
/* And empty line to terminate header: */
wpabuf_put_str(buf, "\r\n");
os_free(callback_urls);
http_request_send_and_deinit(req, buf);
return;
error:
/* Per UPnP spec:
* Errors
* Incompatible headers
* 400 Bad Request. If SID header and one of NT or CALLBACK headers
* are present, the publisher must respond with HTTP error
* 400 Bad Request.
* Missing or invalid CALLBACK
* 412 Precondition Failed. If CALLBACK header is missing or does not
* contain a valid HTTP URL, the publisher must respond with HTTP
* error 412 Precondition Failed.
* Invalid NT
* 412 Precondition Failed. If NT header does not equal upnp:event,
* the publisher must respond with HTTP error 412 Precondition
* Failed.
* [For resubscription, use 412 if unknown uuid].
* Unable to accept subscription
* 5xx. If a publisher is not able to accept a subscription (such as
* due to insufficient resources), it must respond with a
* HTTP 500-series error code.
* 599 Too many subscriptions (not a standard HTTP error)
*/
wpa_printf(MSG_DEBUG, "WPS UPnP: SUBSCRIBE failed - return %d", ret);
http_put_empty(buf, ret);
http_request_send_and_deinit(req, buf);
os_free(callback_urls);
}
/* Given that we have received a header w/ UNSUBSCRIBE, act upon it
*
* Format of UNSUBSCRIBE (case-insensitive):
*
* First line must be:
* UNSUBSCRIBE /wps_event HTTP/1.1
*
* Our response (if no error) which includes only required lines is:
* HTTP/1.1 200 OK
* Content-Length: 0
*
* Header lines must end with \r\n
* Per RFC 2616, content-length: is not required but connection:close
* would appear to be required (given that we will be closing it!).
*/
static void web_connection_parse_unsubscribe(struct upnp_wps_device_sm *sm,
struct http_request *req,
const char *filename)
{
struct wpabuf *buf;
char *hdr = http_request_get_hdr(req);
char *h;
char *match;
int match_len;
char *end;
u8 uuid[UUID_LEN];
int got_uuid = 0;
struct subscription *s = NULL;
enum http_reply_code ret = HTTP_INTERNAL_SERVER_ERROR;
/* Parse/validate headers */
h = hdr;
/* First line: UNSUBSCRIBE /wps_event HTTP/1.1
* has already been parsed.
*/
if (os_strcasecmp(filename, UPNP_WPS_DEVICE_EVENT_FILE) != 0) {
ret = HTTP_PRECONDITION_FAILED;
goto send_msg;
}
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP UNSUBSCRIBE for event");
end = os_strchr(h, '\n');
while (end) {
/* Option line by option line */
h = end + 1;
end = os_strchr(h, '\n');
if (end == NULL)
break; /* no unterminated lines allowed */
/* HOST should refer to us */
#if 0
match = "HOST:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
.....
}
#endif
match = "SID:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
match = "uuid:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) != 0) {
ret = HTTP_BAD_REQUEST;
goto send_msg;
}
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
if (uuid_str2bin(h, uuid)) {
ret = HTTP_BAD_REQUEST;
goto send_msg;
}
got_uuid = 1;
continue;
}
match = "NT:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
ret = HTTP_BAD_REQUEST;
goto send_msg;
}
match = "CALLBACK:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
ret = HTTP_BAD_REQUEST;
goto send_msg;
}
}
if (got_uuid) {
s = subscription_find(sm, uuid);
if (s) {
struct subscr_addr *sa;
sa = dl_list_first(&s->addr_list, struct subscr_addr,
list);
wpa_printf(MSG_DEBUG, "WPS UPnP: Unsubscribing %p %s",
s, (sa && sa->domain_and_port) ?
sa->domain_and_port : "-null-");
dl_list_del(&s->list);
subscription_destroy(s);
} else {
wpa_printf(MSG_INFO, "WPS UPnP: Could not find matching subscription to unsubscribe");
ret = HTTP_PRECONDITION_FAILED;
goto send_msg;
}
} else {
wpa_printf(MSG_INFO, "WPS UPnP: Unsubscribe fails (not "
"found)");
ret = HTTP_PRECONDITION_FAILED;
goto send_msg;
}
ret = HTTP_OK;
send_msg:
buf = wpabuf_alloc(200);
if (buf == NULL) {
http_request_deinit(req);
return;
}
http_put_empty(buf, ret);
http_request_send_and_deinit(req, buf);
}
/* Send error in response to unknown requests */
static void web_connection_unimplemented(struct http_request *req)
{
struct wpabuf *buf;
buf = wpabuf_alloc(200);
if (buf == NULL) {
http_request_deinit(req);
return;
}
http_put_empty(buf, HTTP_UNIMPLEMENTED);
http_request_send_and_deinit(req, buf);
}
/* Called when we have gotten an apparently valid http request.
*/
static void web_connection_check_data(void *ctx, struct http_request *req)
{
struct upnp_wps_device_sm *sm = ctx;
enum httpread_hdr_type htype = http_request_get_type(req);
char *filename = http_request_get_uri(req);
struct sockaddr_in *cli = http_request_get_cli_addr(req);
if (!filename) {
wpa_printf(MSG_INFO, "WPS UPnP: Could not get HTTP URI");
http_request_deinit(req);
return;
}
/* Trim leading slashes from filename */
while (*filename == '/')
filename++;
wpa_printf(MSG_DEBUG, "WPS UPnP: Got HTTP request type %d from %s:%d",
htype, inet_ntoa(cli->sin_addr), htons(cli->sin_port));
switch (htype) {
case HTTPREAD_HDR_TYPE_GET:
web_connection_parse_get(sm, req, filename);
break;
case HTTPREAD_HDR_TYPE_POST:
web_connection_parse_post(sm, cli, req, filename);
break;
case HTTPREAD_HDR_TYPE_SUBSCRIBE:
web_connection_parse_subscribe(sm, req, filename);
break;
case HTTPREAD_HDR_TYPE_UNSUBSCRIBE:
web_connection_parse_unsubscribe(sm, req, filename);
break;
/* We are not required to support M-POST; just plain
* POST is supposed to work, so we only support that.
* If for some reason we need to support M-POST, it is
* mostly the same as POST, with small differences.
*/
default:
/* Send 501 for anything else */
web_connection_unimplemented(req);
break;
}
}
/*
* Listening for web connections
* We have a single TCP listening port, and hand off connections as we get
* them.
*/
void web_listener_stop(struct upnp_wps_device_sm *sm)
{
http_server_deinit(sm->web_srv);
sm->web_srv = NULL;
}
int web_listener_start(struct upnp_wps_device_sm *sm)
{
struct in_addr addr;
addr.s_addr = sm->ip_addr;
sm->web_srv = http_server_init(&addr, -1, web_connection_check_data,
sm);
if (sm->web_srv == NULL) {
web_listener_stop(sm);
return -1;
}
sm->web_port = http_server_get_port(sm->web_srv);
return 0;
}