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miniupnp/miniupnpd/upnphttp.c

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/* $Id: upnphttp.c,v 1.113 2023/06/22 23:17:01 nanard Exp $ */
/* vim: tabstop=4 shiftwidth=4 noexpandtab
* Project : miniupnp
* Website : http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
* Author : Thomas Bernard
* Copyright (c) 2005-2023 Thomas Bernard
* This software is subject to the conditions detailed in the
* LICENCE file included in this distribution.
* */
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <syslog.h>
#include <ctype.h>
#include <errno.h>
#include "config.h"
#ifdef ENABLE_HTTP_DATE
#include <time.h>
#endif
#include "upnphttp.h"
#include "upnpdescgen.h"
#include "miniupnpdpath.h"
#include "upnpsoap.h"
#include "upnpevents.h"
#include "upnputils.h"
#if defined(RANDOMIZE_URLS) || defined(DYNAMIC_OS_VERSION)
#include "upnpglobalvars.h"
#endif /* RANDOMIZE_URLS */
#ifdef ENABLE_HTTPS
#include <openssl/err.h>
#include <openssl/engine.h>
#include <openssl/conf.h>
static SSL_CTX *ssl_ctx = NULL;
#ifndef HTTPS_CERTFILE
#define HTTPS_CERTFILE "/etc/ssl/certs/ssl-cert-snakeoil.pem"
#endif
#ifndef HTTPS_KEYFILE
#define HTTPS_KEYFILE "/etc/ssl/private/ssl-cert-snakeoil.key"
#endif
static void
syslogsslerr(void)
{
unsigned long err;
char buffer[256];
while((err = ERR_get_error()) != 0) {
syslog(LOG_ERR, "%s", ERR_error_string(err, buffer));
}
}
static int verify_callback(int preverify_ok, X509_STORE_CTX *ctx)
{
syslog(LOG_DEBUG, "verify_callback(%d, %p)", preverify_ok, ctx);
return preverify_ok;
}
int init_ssl(void)
{
const SSL_METHOD *method;
SSL_library_init();
SSL_load_error_strings();
#if OPENSSL_VERSION_NUMBER < 0x10100000L
method = TLSv1_server_method();
#else
method = TLS_server_method();
#endif
if(method == NULL) {
#if OPENSSL_VERSION_NUMBER < 0x10100000L
syslog(LOG_ERR, "TLSv1_server_method() failed");
#else
syslog(LOG_ERR, "TLS_server_method() failed");
#endif
syslogsslerr();
return -1;
}
ssl_ctx = SSL_CTX_new(method);
if(ssl_ctx == NULL) {
syslog(LOG_ERR, "SSL_CTX_new() failed");
syslogsslerr();
return -1;
}
/* set the local certificate */
if(!SSL_CTX_use_certificate_file(ssl_ctx, HTTPS_CERTFILE, SSL_FILETYPE_PEM)) {
syslog(LOG_ERR, "SSL_CTX_use_certificate_file(%s) failed", HTTPS_CERTFILE);
syslogsslerr();
return -1;
}
/* set the private key */
if(!SSL_CTX_use_PrivateKey_file(ssl_ctx, HTTPS_KEYFILE, SSL_FILETYPE_PEM)) {
syslog(LOG_ERR, "SSL_CTX_use_PrivateKey_file(%s) failed", HTTPS_KEYFILE);
syslogsslerr();
return -1;
}
/* verify private key */
if(!SSL_CTX_check_private_key(ssl_ctx)) {
syslog(LOG_ERR, "SSL_CTX_check_private_key() failed");
syslogsslerr();
return -1;
}
/*SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE, verify_callback);*/
SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_NONE, verify_callback);
/*SSL_CTX_set_verify_depth(depth);*/
syslog(LOG_INFO, "using %s", SSLeay_version(SSLEAY_VERSION));
return 0;
}
void free_ssl(void)
{
/* free context */
if(ssl_ctx != NULL) {
SSL_CTX_free(ssl_ctx);
ssl_ctx = NULL;
}
#if OPENSSL_VERSION_NUMBER >= 0x10000000L && OPENSSL_VERSION_NUMBER < 0x10100000L
ERR_remove_thread_state(NULL);
#elif OPENSSL_VERSION_NUMBER < 0x10000000L
ERR_remove_state(0);
#endif
ENGINE_cleanup();
CONF_modules_unload(1);
ERR_free_strings();
EVP_cleanup();
CRYPTO_cleanup_all_ex_data();
}
#endif /* ENABLE_HTTPS */
struct upnphttp *
New_upnphttp(int s)
{
struct upnphttp * ret;
if(s<0)
return NULL;
ret = (struct upnphttp *)malloc(sizeof(struct upnphttp));
if(ret == NULL)
return NULL;
memset(ret, 0, sizeof(struct upnphttp));
ret->socket = s;
if(!set_non_blocking(s))
syslog(LOG_WARNING, "New_upnphttp::set_non_blocking(): %m");
return ret;
}
#ifdef ENABLE_HTTPS
void
InitSSL_upnphttp(struct upnphttp * h)
{
int r;
h->ssl = SSL_new(ssl_ctx);
if(h->ssl == NULL) {
syslog(LOG_ERR, "SSL_new() failed");
syslogsslerr();
abort();
}
if(!SSL_set_fd(h->ssl, h->socket)) {
syslog(LOG_ERR, "SSL_set_fd() failed");
syslogsslerr();
abort();
}
r = SSL_accept(h->ssl); /* start the handshaking */
if(r < 0) {
int err;
err = SSL_get_error(h->ssl, r);
syslog(LOG_DEBUG, "SSL_accept() returned %d, SSL_get_error() %d", r, err);
if(err != SSL_ERROR_WANT_READ && err != SSL_ERROR_WANT_WRITE) {
syslog(LOG_ERR, "SSL_accept() failed");
syslogsslerr();
abort();
}
}
}
#endif /* ENABLE_HTTPS */
void
CloseSocket_upnphttp(struct upnphttp * h)
{
/* SSL_shutdown() ? */
if(close(h->socket) < 0)
{
syslog(LOG_ERR, "CloseSocket_upnphttp: close(%d): %m", h->socket);
}
h->socket = -1;
h->state = EToDelete;
}
void
Delete_upnphttp(struct upnphttp * h)
{
if(h)
{
#ifdef ENABLE_HTTPS
if(h->ssl)
SSL_free(h->ssl);
#endif
if(h->socket >= 0)
CloseSocket_upnphttp(h);
if(h->req_buf)
free(h->req_buf);
if(h->res_buf)
free(h->res_buf);
free(h);
}
}
/* parse HttpHeaders of the REQUEST
* This function is called after the \r\n\r\n character
* sequence has been found in h->req_buf */
static void
ParseHttpHeaders(struct upnphttp * h)
{
char * line;
char * colon;
char * p;
int n;
if((h->req_buf == NULL) || (h->req_contentoff <= 0))
return;
line = h->req_buf;
while(line < (h->req_buf + h->req_contentoff))
{
colon = line;
while(*colon != ':')
{
if(*colon == '\r' || *colon == '\n')
{
colon = NULL; /* no ':' character found on the line */
break;
}
colon++;
}
if(colon)
{
if(strncasecmp(line, "Content-Length:", 15)==0)
{
p = colon;
while((*p < '0' || *p > '9') && (*p != '\r') && (*p != '\n'))
p++;
h->req_contentlen = atoi(p);
if(h->req_contentlen < 0) {
syslog(LOG_WARNING, "ParseHttpHeaders() invalid Content-Length %d", h->req_contentlen);
h->req_contentlen = 0;
}
/*printf("*** Content-Lenght = %d ***\n", h->req_contentlen);
printf(" readbufflen=%d contentoff = %d\n",
h->req_buflen, h->req_contentoff);*/
}
else if(strncasecmp(line, "Host:", 5)==0)
{
p = colon;
n = 0;
while(*p == ':' || *p == ' ' || *p == '\t')
p++;
while(p[n]>' ')
n++;
h->req_HostOff = p - h->req_buf;
h->req_HostLen = n;
}
else if(strncasecmp(line, "SOAPAction:", 11)==0)
{
p = colon;
n = 0;
while(*p == ':' || *p == ' ' || *p == '\t')
p++;
while(p[n]>=' ')
n++;
if((p[0] == '"' && p[n-1] == '"')
|| (p[0] == '\'' && p[n-1] == '\''))
{
p++; n -= 2;
}
h->req_soapActionOff = p - h->req_buf;
h->req_soapActionLen = n;
}
else if(strncasecmp(line, "accept-language:", 16) == 0)
{
p = colon;
n = 0;
while(*p == ':' || *p == ' ' || *p == '\t')
p++;
while(p[n]>=' ')
n++;
syslog(LOG_DEBUG, "accept-language HTTP header : '%.*s'", n, p);
/* keep only the 1st accepted language */
n = 0;
while(p[n]>' ' && p[n] != ',')
n++;
if(n >= (int)sizeof(h->accept_language))
n = (int)sizeof(h->accept_language) - 1;
memcpy(h->accept_language, p, n);
h->accept_language[n] = '\0';
}
else if(strncasecmp(line, "expect:", 7) == 0)
{
p = colon;
n = 0;
while(*p == ':' || *p == ' ' || *p == '\t')
p++;
while(p[n]>=' ')
n++;
if(strncasecmp(p, "100-continue", 12) == 0) {
h->respflags |= FLAG_CONTINUE;
syslog(LOG_DEBUG, "\"Expect: 100-Continue\" header detected");
}
}
else if(strncasecmp(line, "user-agent:", 11) == 0)
{
/* - User-Agent: Microsoft-Windows/10.0 UPnP/1.0
* - User-Agent: FDSSDP */
if(strcasestr(line + 11, "microsoft") != NULL || strstr(line + 11, "FDSSDP") != NULL) {
h->respflags |= FLAG_MS_CLIENT;
}
}
#ifdef ENABLE_EVENTS
else if(strncasecmp(line, "Callback:", 9)==0)
{
/* The Callback can contain several urls :
* If there is more than one URL, when the service sends
* events, it will try these URLs in order until one
* succeeds. One or more URLs each enclosed by angle
* brackets ("<" and ">") */
p = colon;
while(*p != '<' && *p != '\r' )
p++;
n = 0;
while(p[n] != '\r')
n++;
while(n > 0 && p[n] != '>')
n--;
/* found last > character */
h->req_CallbackOff = p - h->req_buf;
h->req_CallbackLen = MAX(0, n + 1);
}
else if(strncasecmp(line, "SID:", 4)==0)
{
p = colon + 1;
while((*p == ' ') || (*p == '\t'))
p++;
n = 0;
while(!isspace(p[n]))
n++;
h->req_SIDOff = p - h->req_buf;
h->req_SIDLen = n;
}
/* Timeout: Seconds-nnnn */
/* TIMEOUT
Recommended. Requested duration until subscription expires,
either number of seconds or infinite. Recommendation
by a UPnP Forum working committee. Defined by UPnP vendor.
Consists of the keyword "Second-" followed (without an
intervening space) by either an integer or the keyword "infinite". */
else if(strncasecmp(line, "Timeout:", 8)==0)
{
p = colon + 1;
while((*p == ' ') || (*p == '\t'))
p++;
if(strncasecmp(p, "Second-", 7)==0) {
h->req_Timeout = atoi(p+7);
}
}
#ifdef UPNP_STRICT
else if(strncasecmp(line, "nt:", 3)==0)
{
p = colon + 1;
while((*p == ' ') || (*p == '\t'))
p++;
n = 0;
while(!isspace(p[n]))
n++;
h->req_NTOff = p - h->req_buf;
h->req_NTLen = n;
}
#endif /* UPNP_STRICT */
#endif /* ENABLE_EVENTS */
}
/* the loop below won't run off the end of the buffer
* because the buffer is guaranteed to contain the \r\n\r\n
* character sequence */
while(!(line[0] == '\r' && line[1] == '\n'))
line++;
line += 2;
}
}
/* very minimalistic 404 error message */
static void
Send404(struct upnphttp * h)
{
static const char body404[] =
"<HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD>"
"<BODY><H1>Not Found</H1>The requested URL was not found"
" on this server.</BODY></HTML>\r\n";
h->respflags = FLAG_HTML;
BuildResp2_upnphttp(h, 404, "Not Found",
body404, sizeof(body404) - 1);
SendRespAndClose_upnphttp(h);
}
static void
Send405(struct upnphttp * h)
{
static const char body405[] =
"<HTML><HEAD><TITLE>405 Method Not Allowed</TITLE></HEAD>"
"<BODY><H1>Method Not Allowed</H1>The HTTP Method "
"is not allowed on this resource.</BODY></HTML>\r\n";
h->respflags |= FLAG_HTML;
BuildResp2_upnphttp(h, 405, "Method Not Allowed",
body405, sizeof(body405) - 1);
SendRespAndClose_upnphttp(h);
}
/* very minimalistic 501 error message */
static void
Send501(struct upnphttp * h)
{
static const char body501[] =
"<HTML><HEAD><TITLE>501 Not Implemented</TITLE></HEAD>"
"<BODY><H1>Not Implemented</H1>The HTTP Method "
"is not implemented by this server.</BODY></HTML>\r\n";
h->respflags = FLAG_HTML;
BuildResp2_upnphttp(h, 501, "Not Implemented",
body501, sizeof(body501) - 1);
SendRespAndClose_upnphttp(h);
}
/* findendheaders() find the \r\n\r\n character sequence and
* return a pointer to it.
* It returns NULL if not found */
static const char *
findendheaders(const char * s, int len)
{
while(len-->3)
{
if(s[0]=='\r' && s[1]=='\n' && s[2]=='\r' && s[3]=='\n')
return s;
s++;
}
return NULL;
}
#ifdef HAS_DUMMY_SERVICE
static void
sendDummyDesc(struct upnphttp * h)
{
static const char xml_desc[] = "<?xml version=\"1.0\"?>\r\n"
"<scpd xmlns=\"urn:schemas-upnp-org:service-1-0\">"
" <specVersion>"
" <major>1</major>"
" <minor>0</minor>"
" </specVersion>"
" <actionList />"
" <serviceStateTable />"
"</scpd>\r\n";
BuildResp_upnphttp(h, xml_desc, sizeof(xml_desc)-1);
SendRespAndClose_upnphttp(h);
}
#endif
/* Sends the description generated by the parameter */
static void
sendXMLdesc(struct upnphttp * h, char * (f)(int *, int))
{
char * desc;
int len;
#ifdef IGD_V2
#ifdef DEBUG
if(h->respflags & FLAG_MS_CLIENT)
syslog(LOG_DEBUG, "MS Client, forcing IGD v1");
#endif /* DEBUG */
desc = f(&len, GETFLAG(FORCEIGDDESCV1MASK) || (h->respflags & FLAG_MS_CLIENT));
#else
desc = f(&len, 0);
#endif
if(!desc)
{
static const char error500[] = "<HTML><HEAD><TITLE>Error 500</TITLE>"
"</HEAD><BODY>Internal Server Error</BODY></HTML>\r\n";
syslog(LOG_ERR, "Failed to generate XML description");
h->respflags = FLAG_HTML;
BuildResp2_upnphttp(h, 500, "Internal Server Error",
error500, sizeof(error500)-1);
}
else
{
BuildResp_upnphttp(h, desc, len);
}
SendRespAndClose_upnphttp(h);
free(desc);
}
/* ProcessHTTPPOST_upnphttp()
* executes the SOAP query if it is possible */
static void
ProcessHTTPPOST_upnphttp(struct upnphttp * h)
{
if((h->req_buflen - h->req_contentoff) >= h->req_contentlen)
{
/* the request body is received */
if(h->req_soapActionOff > 0)
{
/* we can process the request */
syslog(LOG_INFO, "SOAPAction: %.*s",
h->req_soapActionLen, h->req_buf + h->req_soapActionOff);
ExecuteSoapAction(h,
h->req_buf + h->req_soapActionOff,
h->req_soapActionLen);
}
else
{
static const char err400str[] =
"<html><body>Bad request</body></html>";
syslog(LOG_INFO, "No SOAPAction in HTTP headers");
h->respflags = FLAG_HTML;
BuildResp2_upnphttp(h, 400, "Bad Request",
err400str, sizeof(err400str) - 1);
SendRespAndClose_upnphttp(h);
}
}
else if(h->respflags & FLAG_CONTINUE)
{
/* Sending the 100 Continue response */
if(!h->res_buf) {
h->res_buf = malloc(256);
h->res_buf_alloclen = 256;
}
h->res_buflen = snprintf(h->res_buf, h->res_buf_alloclen,
"%s 100 Continue\r\n\r\n", h->HttpVer);
h->res_sent = 0;
h->state = ESendingContinue;
if(SendResp_upnphttp(h))
h->state = EWaitingForHttpContent;
}
else
{
/* waiting for remaining data */
h->state = EWaitingForHttpContent;
}
}
#ifdef ENABLE_EVENTS
/**
* checkCallbackURL()
* check that url is on originating IP
* extract first correct URL
* returns 0 if the callback header value is not valid
* 1 if it is valid.
*/
static int
checkCallbackURL(struct upnphttp * h)
{
char addrstr[48];
int ipv6;
const char * p;
unsigned int i;
start_again:
if(h->req_CallbackOff <= 0 || h->req_CallbackLen < 10)
return 0;
if(memcmp(h->req_buf + h->req_CallbackOff, "<http://", 8) != 0) {
p = h->req_buf + h->req_CallbackOff + 1;
goto invalid;
}
/* extract host from url to addrstr[] */
i = 0;
p = h->req_buf + h->req_CallbackOff + 8;
if(*p == '[') {
p++;
ipv6 = 1;
while(*p != ']' && *p != '>' && i < (sizeof(addrstr)-1)
&& p < (h->req_buf + h->req_CallbackOff + h->req_CallbackLen))
addrstr[i++] = *(p++);
} else {
ipv6 = 0;
while(*p != '/' && *p != ':' && *p != '>' && i < (sizeof(addrstr)-1)
&& p < (h->req_buf + h->req_CallbackOff + h->req_CallbackLen))
addrstr[i++] = *(p++);
}
addrstr[i] = '\0';
/* check addrstr */
if(ipv6) {
#ifdef ENABLE_IPV6
struct in6_addr addr;
if(inet_pton(AF_INET6, addrstr, &addr) <= 0)
goto invalid;
if(!h->ipv6
|| (0!=memcmp(&addr, &(h->clientaddr_v6), sizeof(struct in6_addr))))
goto invalid;
#else
goto invalid;
#endif
} else {
struct in_addr addr;
if(inet_pton(AF_INET, addrstr, &addr) <= 0)
goto invalid;
#ifdef ENABLE_IPV6
if(h->ipv6) {
if(!IN6_IS_ADDR_V4MAPPED(&(h->clientaddr_v6)))
goto invalid;
if(0!=memcmp(&addr, ((const char *)&(h->clientaddr_v6) + 12), 4))
goto invalid;
} else {
if(0!=memcmp(&addr, &(h->clientaddr), sizeof(struct in_addr)))
goto invalid;
}
#else
if(0!=memcmp(&addr, &(h->clientaddr), sizeof(struct in_addr)))
goto invalid;
#endif
}
/* select only the good callback url */
while(p < h->req_buf + h->req_CallbackOff + h->req_CallbackLen && *p != '>')
p++;
h->req_CallbackOff++; /* skip initial '<' */
h->req_CallbackLen = (int)(p - h->req_buf - h->req_CallbackOff);
return 1;
invalid:
while(p < h->req_buf + h->req_CallbackOff + h->req_CallbackLen && *p != '>')
p++;
if(*p != '>') return 0;
while(p < h->req_buf + h->req_CallbackOff + h->req_CallbackLen && *p != '<')
p++;
if(*p != '<') return 0;
h->req_CallbackLen -= (int)(p - h->req_buf - h->req_CallbackOff);
h->req_CallbackOff = (int)(p - h->req_buf);
goto start_again;
}
static void
ProcessHTTPSubscribe_upnphttp(struct upnphttp * h, const char * path)
{
const char * sid;
syslog(LOG_DEBUG, "ProcessHTTPSubscribe %s", path);
syslog(LOG_DEBUG, "Callback '%.*s' Timeout=%d",
h->req_CallbackLen, h->req_buf + h->req_CallbackOff,
h->req_Timeout);
syslog(LOG_DEBUG, "SID '%.*s'", h->req_SIDLen, h->req_buf + h->req_SIDOff);
#if defined(UPNP_STRICT) && (UPNP_VERSION_MAJOR > 1) || (UPNP_VERSION_MINOR > 0)
/*if(h->req_Timeout < 1800) {*/
if(h->req_Timeout == 0) {
/* Second-infinite is forbidden with UDA v1.1 and later :
* (UDA 1.1 : 4.1.1 Subscription)
* UPnP 1.1 control points MUST NOT subscribe using keyword infinite,
* UPnP 1.1 devices MUST NOT set actual subscription durations to
* "infinite". The presence of infinite in a request MUST be silently
* ignored by a UPnP 1.1 device (the presence of infinite is handled
* by the device as if the TIMEOUT header field in a request was not
* present) . The keyword infinite MUST NOT be returned by a UPnP 1.1
* device. */
h->req_Timeout = 1800; /* default to 30 minutes */
}
#endif /* UPNP_STRICT */
if((h->req_CallbackOff <= 0) && (h->req_SIDOff <= 0)) {
/* 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*/
BuildResp2_upnphttp(h, 412, "Precondition Failed", 0, 0);
SendRespAndClose_upnphttp(h);
} else {
/* - add to the subscriber list
* - respond HTTP/x.x 200 OK
* - Send the initial event message */
/* Server:, SID:; Timeout: Second-(xx|infinite) */
/* Check that the callback URL is on the same IP as
* the request, and not on the internet, nor on ourself (DOS attack ?) */
if(h->req_CallbackOff > 0) {
#ifdef UPNP_STRICT
/* SID: and Callback: are incompatible */
if(h->req_SIDOff > 0) {
syslog(LOG_WARNING, "Both Callback: and SID: in SUBSCRIBE");
BuildResp2_upnphttp(h, 400, "Incompatible header fields", 0, 0);
/* "NT: upnp:event" header is mandatory */
} else if(h->req_NTOff <= 0 || h->req_NTLen != 10 ||
0 != memcmp("upnp:event", h->req_buf + h->req_NTOff, 10)) {
syslog(LOG_WARNING, "Invalid NT in SUBSCRIBE %.*s",
h->req_NTLen, h->req_buf + h->req_NTOff);
BuildResp2_upnphttp(h, 412, "Precondition Failed", 0, 0);
} else
#endif
if(checkCallbackURL(h)) {
sid = upnpevents_addSubscriber(path, h->req_buf + h->req_CallbackOff,
h->req_CallbackLen, h->req_Timeout);
h->respflags = FLAG_TIMEOUT;
if(sid) {
syslog(LOG_DEBUG, "generated sid=%s", sid);
h->respflags |= FLAG_SID;
h->res_SID = sid;
}
BuildResp_upnphttp(h, 0, 0);
} else {
syslog(LOG_WARNING, "Invalid Callback in SUBSCRIBE %.*s",
h->req_CallbackLen, h->req_buf + h->req_CallbackOff);
BuildResp2_upnphttp(h, 412, "Precondition Failed", 0, 0);
}
} else {
/* subscription renew */
/* Invalid SID
412 Precondition Failed. If a SID does not correspond to a known,
un-expired subscription, the publisher must respond
with HTTP error 412 Precondition Failed. */
#ifdef UPNP_STRICT
/* SID: and NT: headers are incompatibles */
if(h->req_NTOff > 0) {
syslog(LOG_WARNING, "Both NT: and SID: in SUBSCRIBE");
BuildResp2_upnphttp(h, 400, "Incompatible header fields", 0, 0);
} else {
#endif /* UPNP_STRICT */
sid = upnpevents_renewSubscription(h->req_buf + h->req_SIDOff,
h->req_SIDLen, h->req_Timeout);
if(!sid) {
BuildResp2_upnphttp(h, 412, "Precondition Failed", 0, 0);
} else {
h->respflags = FLAG_TIMEOUT | FLAG_SID;
h->res_SID = sid;
BuildResp_upnphttp(h, 0, 0);
}
#ifdef UPNP_STRICT
}
#endif /* UPNP_STRICT */
}
SendRespAndClose_upnphttp(h);
}
}
static void
ProcessHTTPUnSubscribe_upnphttp(struct upnphttp * h, const char * path)
{
syslog(LOG_DEBUG, "ProcessHTTPUnSubscribe %s", path);
syslog(LOG_DEBUG, "SID '%.*s'", h->req_SIDLen, h->req_buf + h->req_SIDOff);
/* Remove from the list */
#ifdef UPNP_STRICT
if(h->req_SIDOff <= 0 || h->req_SIDLen == 0) {
/* SID: header missing or empty */
BuildResp2_upnphttp(h, 412, "Precondition Failed", 0, 0);
} else if(h->req_CallbackOff > 0 || h->req_NTOff > 0) {
/* no NT: or Callback: header must be present */
BuildResp2_upnphttp(h, 400, "Incompatible header fields", 0, 0);
} else
#endif
if(upnpevents_removeSubscriber(h->req_buf + h->req_SIDOff, h->req_SIDLen) < 0) {
BuildResp2_upnphttp(h, 412, "Precondition Failed", 0, 0);
} else {
BuildResp_upnphttp(h, 0, 0);
}
SendRespAndClose_upnphttp(h);
}
#endif
/* Parse and process Http Query
* called once all the HTTP headers have been received,
* so it is guaranteed that h->req_buf contains the \r\n\r\n
* character sequence */
static void
ProcessHttpQuery_upnphttp(struct upnphttp * h)
{
static const struct {
const char * path;
char * (* f)(int *, int);
} path_desc[] = {
{ ROOTDESC_PATH, genRootDesc},
{ WANIPC_PATH, genWANIPCn},
{ WANCFG_PATH, genWANCfg},
#ifdef HAS_DUMMY_SERVICE
{ DUMMY_PATH, NULL},
#endif
#ifdef ENABLE_L3F_SERVICE
{ L3F_PATH, genL3F},
#endif
#ifdef ENABLE_6FC_SERVICE
{ WANIP6FC_PATH, gen6FC},
#endif
#ifdef ENABLE_DP_SERVICE
{ DP_PATH, genDP},
#endif
{ NULL, NULL}
};
char HttpCommand[16];
char HttpUrl[128];
char * HttpVer;
char * p;
int i;
p = h->req_buf;
if(!p)
return;
/* note : checking (*p != '\r') is enough to avoid running off the
* end of the buffer, because h->req_buf is guaranteed to contain
* the \r\n\r\n character sequence */
for(i = 0; i<15 && *p != ' ' && *p != '\r'; i++)
HttpCommand[i] = *(p++);
HttpCommand[i] = '\0';
while(*p==' ')
p++;
for(i = 0; i<127 && *p != ' ' && *p != '\r'; i++)
HttpUrl[i] = *(p++);
HttpUrl[i] = '\0';
while(*p==' ')
p++;
HttpVer = h->HttpVer;
for(i = 0; i<15 && *p != '\r'; i++)
HttpVer[i] = *(p++);
HttpVer[i] = '\0';
syslog(LOG_INFO, "HTTP REQUEST from %s : %s %s (%s)",
h->clientaddr_str, HttpCommand, HttpUrl, HttpVer);
ParseHttpHeaders(h);
if(h->req_HostOff > 0 && h->req_HostLen > 0) {
syslog(LOG_DEBUG, "Host: %.*s", h->req_HostLen, h->req_buf + h->req_HostOff);
p = h->req_buf + h->req_HostOff;
if(*p == '[') {
/* IPv6 */
p++;
while(p < h->req_buf + h->req_HostOff + h->req_HostLen) {
if(*p == ']') break;
/* TODO check *p in [0-9a-f:.] */
p++;
}
if(*p != ']') {
syslog(LOG_NOTICE, "DNS rebinding attack suspected (Host: %.*s)", h->req_HostLen, h->req_buf + h->req_HostOff);
Send404(h);/* 403 */
return;
}
p++;
/* TODO : Check port */
} else {
for(i = 0; i < h->req_HostLen; i++) {
if(*p != ':' && *p != '.' && (*p > '9' || *p < '0')) {
syslog(LOG_NOTICE, "DNS rebinding attack suspected (Host: %.*s)", h->req_HostLen, h->req_buf + h->req_HostOff);
Send404(h);/* 403 */
return;
}
p++;
}
}
}
#ifdef RANDOMIZE_URLS
/* first check if the URL begins with the randomized string */
if(HttpUrl[0] != '/' || memcmp(HttpUrl+1, random_url, strlen(random_url)) != 0)
{
Send404(h);
return;
}
/* remove "random" from the start of the URL */
p = HttpUrl + strlen(random_url) + 1;
memmove(HttpUrl, p, strlen(p) + 1);
#endif /* RANDOMIZE_URLS */
if(strcmp("POST", HttpCommand) == 0)
{
h->req_command = EPost;
ProcessHTTPPOST_upnphttp(h);
}
else if(strcmp("GET", HttpCommand) == 0)
{
h->req_command = EGet;
for(i=0; path_desc[i].path; i++) {
if(strcasecmp(path_desc[i].path, HttpUrl) == 0) {
if(path_desc[i].f)
sendXMLdesc(h, path_desc[i].f);
else
#ifdef HAS_DUMMY_SERVICE
sendDummyDesc(h);
#else
continue;
#endif
return;
}
}
if(0 == memcmp(HttpUrl, "/ctl/", 5)) {
/* 405 Method Not Allowed
* Allow: POST */
h->respflags = FLAG_ALLOW_POST;
Send405(h);
return;
}
#ifdef ENABLE_EVENTS
if(0 == memcmp(HttpUrl, "/evt/", 5)) {
/* 405 Method Not Allowed
* Allow: SUBSCRIBE, UNSUBSCRIBE */
h->respflags = FLAG_ALLOW_SUB_UNSUB;
Send405(h);
return;
}
#endif
syslog(LOG_NOTICE, "%s not found, responding ERROR 404", HttpUrl);
Send404(h);
}
#ifdef ENABLE_EVENTS
else if(strcmp("SUBSCRIBE", HttpCommand) == 0)
{
h->req_command = ESubscribe;
ProcessHTTPSubscribe_upnphttp(h, HttpUrl);
}
else if(strcmp("UNSUBSCRIBE", HttpCommand) == 0)
{
h->req_command = EUnSubscribe;
ProcessHTTPUnSubscribe_upnphttp(h, HttpUrl);
}
#else
else if(strcmp("SUBSCRIBE", HttpCommand) == 0)
{
syslog(LOG_NOTICE, "SUBSCRIBE not implemented. ENABLE_EVENTS compile option disabled");
Send501(h);
}
#endif
else
{
syslog(LOG_NOTICE, "Unsupported HTTP Command %s", HttpCommand);
Send501(h);
}
}
void
Process_upnphttp(struct upnphttp * h)
{
char * h_tmp;
char buf[2048];
int n;
if(!h)
return;
switch(h->state)
{
case EWaitingForHttpRequest:
#ifdef ENABLE_HTTPS
if(h->ssl) {
n = SSL_read(h->ssl, buf, sizeof(buf));
} else {
n = recv(h->socket, buf, sizeof(buf), 0);
}
#else
n = recv(h->socket, buf, sizeof(buf), 0);
#endif
if(n<0)
{
#ifdef ENABLE_HTTPS
if(h->ssl) {
int err;
err = SSL_get_error(h->ssl, n);
if(err != SSL_ERROR_WANT_READ && err != SSL_ERROR_WANT_WRITE)
{
syslog(LOG_ERR, "SSL_read() failed");
syslogsslerr();
h->state = EToDelete;
}
} else {
#endif
if(errno != EAGAIN &&
errno != EWOULDBLOCK &&
errno != EINTR)
{
syslog(LOG_ERR, "recv (state0): %m");
h->state = EToDelete;
}
/* if errno is EAGAIN, EWOULDBLOCK or EINTR, try again later */
#ifdef ENABLE_HTTPS
}
#endif
}
else if(n==0)
{
#ifdef ENABLE_IPV6
if (h->ipv6)
{
char clientaddr_str[INET6_ADDRSTRLEN];
if(inet_ntop(AF_INET6, &(h->clientaddr_v6), clientaddr_str, INET6_ADDRSTRLEN) == NULL)
strncpy(clientaddr_str, "*inet_ntop error*", sizeof(clientaddr_str));
syslog(LOG_WARNING, "HTTP Connection from %s closed unexpectedly", clientaddr_str);
}
else
#endif
{
syslog(LOG_WARNING, "HTTP Connection from %s closed unexpectedly", inet_ntoa(h->clientaddr));
}
h->state = EToDelete;
}
else
{
const char * endheaders;
/* if 1st arg of realloc() is null,
* realloc behaves the same as malloc() */
h_tmp = (char *)realloc(h->req_buf, n + h->req_buflen + 1);
if (h_tmp == NULL)
{
syslog(LOG_WARNING, "Unable to allocate new memory for h->req_buf)");
h->state = EToDelete;
}
else
{
h->req_buf = h_tmp;
memcpy(h->req_buf + h->req_buflen, buf, n);
h->req_buflen += n;
h->req_buf[h->req_buflen] = '\0';
}
/* search for the string "\r\n\r\n" */
endheaders = findendheaders(h->req_buf, h->req_buflen);
if(endheaders)
{
/* at this point, the request buffer (h->req_buf)
* is guaranteed to contain the \r\n\r\n character sequence */
h->req_contentoff = endheaders - h->req_buf + 4;
ProcessHttpQuery_upnphttp(h);
}
}
break;
case EWaitingForHttpContent:
#ifdef ENABLE_HTTPS
if(h->ssl) {
n = SSL_read(h->ssl, buf, sizeof(buf));
} else {
n = recv(h->socket, buf, sizeof(buf), 0);
}
#else
n = recv(h->socket, buf, sizeof(buf), 0);
#endif
if(n<0)
{
#ifdef ENABLE_HTTPS
if(h->ssl) {
int err;
err = SSL_get_error(h->ssl, n);
if(err != SSL_ERROR_WANT_READ && err != SSL_ERROR_WANT_WRITE)
{
syslog(LOG_ERR, "SSL_read() failed");
syslogsslerr();
h->state = EToDelete;
}
} else {
#endif
if(errno != EAGAIN &&
errno != EWOULDBLOCK &&
errno != EINTR)
{
syslog(LOG_ERR, "recv (state1): %m");
h->state = EToDelete;
}
/* if errno is EAGAIN, EWOULDBLOCK or EINTR, try again later */
#ifdef ENABLE_HTTPS
}
#endif
}
else if(n==0)
{
#ifdef ENABLE_IPV6
if (h->ipv6)
{
char clientaddr_str[INET6_ADDRSTRLEN];
if(inet_ntop(AF_INET6, &(h->clientaddr_v6), clientaddr_str, INET6_ADDRSTRLEN) == NULL)
strncpy(clientaddr_str, "*inet_ntop error*", sizeof(clientaddr_str));
syslog(LOG_WARNING, "HTTP Connection from %s closed unexpectedly", clientaddr_str);
}
else
#endif
{
syslog(LOG_WARNING, "HTTP Connection from %s closed unexpectedly", inet_ntoa(h->clientaddr));
}
h->state = EToDelete;
}
else
{
void * tmp = realloc(h->req_buf, n + h->req_buflen);
if(!tmp)
{
syslog(LOG_ERR, "memory allocation error %m");
h->state = EToDelete;
}
else
{
h->req_buf = tmp;
memcpy(h->req_buf + h->req_buflen, buf, n);
h->req_buflen += n;
if((h->req_buflen - h->req_contentoff) >= h->req_contentlen)
{
ProcessHTTPPOST_upnphttp(h);
}
}
}
break;
case ESendingContinue:
if(SendResp_upnphttp(h))
h->state = EWaitingForHttpContent;
break;
case ESendingAndClosing:
SendRespAndClose_upnphttp(h);
break;
default:
syslog(LOG_WARNING, "Unexpected state: %d", h->state);
}
}
static const char httpresphead[] =
"%s %d %s\r\n"
"Content-Type: %s\r\n"
"Connection: close\r\n"
"Content-Length: %d\r\n"
"Server: " MINIUPNPD_SERVER_STRING "\r\n"
"Ext:\r\n"
; /*"\r\n";*/
/*
"<?xml version=\"1.0\"?>\n"
"<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\" "
"s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"
"<s:Body>"
"</s:Body>"
"</s:Envelope>";
*/
/* with response code and response message
* also allocate enough memory */
int
BuildHeader_upnphttp(struct upnphttp * h, int respcode,
const char * respmsg,
int bodylen)
{
int templen = sizeof(httpresphead) + 256 + bodylen;
if(!h->res_buf ||
h->res_buf_alloclen < templen) {
if(h->res_buf)
free(h->res_buf);
h->res_buf = (char *)malloc(templen);
if(!h->res_buf) {
syslog(LOG_ERR, "malloc error in BuildHeader_upnphttp()");
return -1;
}
h->res_buf_alloclen = templen;
}
h->res_sent = 0;
h->res_buflen = snprintf(h->res_buf, h->res_buf_alloclen,
httpresphead, h->HttpVer, /* HTTP/x.x */
respcode, respmsg,
(h->respflags&FLAG_HTML)?"text/html":"text/xml; charset=\"utf-8\"", /* Content-Type: */
bodylen /* Content-Length: */
#ifdef DYNAMIC_OS_VERSION
, os_version /* Server: */
#endif
);
/* Content-Type MUST be 'text/xml; charset="utf-8"' according to UDA v1.1 */
/* Content-Type MUST be 'text/xml' according to UDA v1.0 */
/* Additional headers */
#ifdef ENABLE_HTTP_DATE
{
char http_date[64];
time_t t;
struct tm tm;
time(&t);
gmtime_r(&t, &tm);
/* %a and %b depend on locale */
strftime(http_date, sizeof(http_date),
"%a, %d %b %Y %H:%M:%S GMT", &tm);
h->res_buflen += snprintf(h->res_buf + h->res_buflen,
h->res_buf_alloclen - h->res_buflen,
"Date: %s\r\n", http_date);
}
#endif
#ifdef ENABLE_EVENTS
if(h->respflags & FLAG_TIMEOUT) {
h->res_buflen += snprintf(h->res_buf + h->res_buflen,
h->res_buf_alloclen - h->res_buflen,
"Timeout: Second-");
if(h->req_Timeout) {
h->res_buflen += snprintf(h->res_buf + h->res_buflen,
h->res_buf_alloclen - h->res_buflen,
"%d\r\n", h->req_Timeout);
} else {
h->res_buflen += snprintf(h->res_buf + h->res_buflen,
h->res_buf_alloclen - h->res_buflen,
"infinite\r\n");
}
}
if(h->respflags & FLAG_SID) {
h->res_buflen += snprintf(h->res_buf + h->res_buflen,
h->res_buf_alloclen - h->res_buflen,
"SID: %s\r\n", h->res_SID);
}
#endif
if(h->respflags & FLAG_ALLOW_POST) {
h->res_buflen += snprintf(h->res_buf + h->res_buflen,
h->res_buf_alloclen - h->res_buflen,
"Allow: %s\r\n", "POST");
} else if(h->respflags & FLAG_ALLOW_SUB_UNSUB) {
h->res_buflen += snprintf(h->res_buf + h->res_buflen,
h->res_buf_alloclen - h->res_buflen,
"Allow: %s\r\n", "SUBSCRIBE, UNSUBSCRIBE");
}
if(h->accept_language[0] != '\0') {
/* defaulting to "en" */
h->res_buflen += snprintf(h->res_buf + h->res_buflen,
h->res_buf_alloclen - h->res_buflen,
"Content-Language: %s\r\n",
h->accept_language[0] == '*' ? "en" : h->accept_language);
}
h->res_buf[h->res_buflen++] = '\r';
h->res_buf[h->res_buflen++] = '\n';
if(h->res_buf_alloclen < (h->res_buflen + bodylen))
{
char * tmp;
tmp = (char *)realloc(h->res_buf, (h->res_buflen + bodylen));
if(tmp)
{
h->res_buf = tmp;
h->res_buf_alloclen = h->res_buflen + bodylen;
}
else
{
syslog(LOG_ERR, "realloc error in BuildHeader_upnphttp()");
return -1;
}
}
return 0;
}
void
BuildResp2_upnphttp(struct upnphttp * h, int respcode,
const char * respmsg,
const char * body, int bodylen)
{
int r = BuildHeader_upnphttp(h, respcode, respmsg, bodylen);
if(body && (r >= 0)) {
memcpy(h->res_buf + h->res_buflen, body, bodylen);
h->res_buflen += bodylen;
}
}
/* responding 200 OK ! */
void
BuildResp_upnphttp(struct upnphttp * h,
const char * body, int bodylen)
{
BuildResp2_upnphttp(h, 200, "OK", body, bodylen);
}
int
SendResp_upnphttp(struct upnphttp * h)
{
ssize_t n;
while (h->res_sent < h->res_buflen)
{
#ifdef ENABLE_HTTPS
if(h->ssl) {
n = SSL_write(h->ssl, h->res_buf + h->res_sent,
h->res_buflen - h->res_sent);
} else {
n = send(h->socket, h->res_buf + h->res_sent,
h->res_buflen - h->res_sent, 0);
}
#else
n = send(h->socket, h->res_buf + h->res_sent,
h->res_buflen - h->res_sent, 0);
#endif
if(n<0)
{
#ifdef ENABLE_HTTPS
if(h->ssl) {
int err;
err = SSL_get_error(h->ssl, n);
if(err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
/* try again later */
return 0;
}
syslog(LOG_ERR, "SSL_write() failed");
syslogsslerr();
break;
} else {
#endif
if(errno == EINTR)
continue; /* try again immediately */
if(errno == EAGAIN || errno == EWOULDBLOCK)
{
/* try again later */
return 0;
}
syslog(LOG_ERR, "send(res_buf): %m");
break; /* avoid infinite loop */
#ifdef ENABLE_HTTPS
}
#endif
}
else if(n == 0)
{
syslog(LOG_ERR, "send(res_buf): %d bytes sent (out of %d)",
h->res_sent, h->res_buflen);
break;
}
else
{
h->res_sent += n;
}
}
return 1; /* finished */
}
void
SendRespAndClose_upnphttp(struct upnphttp * h)
{
if (SendResp_upnphttp(h))
CloseSocket_upnphttp(h);
else
h->state = ESendingAndClosing;
}
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