--- /dev/null
+/*
+ * This is the other half of the webserver. It handles the task of hooking
+ * up HTTP requests with the sessions they belong to, using HTTP cookies to
+ * keep track of things. If the HTTP request doesn't belong to any currently
+ * active session, a new session is started.
+ *
+ * Copyright (c) 1996-2012 by the citadel.org team
+ *
+ * This program is open source software. You can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include "webcit.h"
+#include "webserver.h"
+#include "modules_init.h"
+
+/* Only one thread may manipulate SessionList at a time... */
+pthread_mutex_t SessionListMutex;
+
+wcsession *SessionList = NULL; /* Linked list of all webcit sessions */
+
+HashList *HttpReqTypes = NULL;
+HashList *HttpHeaderHandler = NULL;
+extern HashList *HandlerHash;
+
+/* the following two values start at 1 because the initial parent thread counts as one. */
+int num_threads_existing = 1; /* Number of worker threads which exist. */
+int num_threads_executing = 1; /* Number of worker threads currently executing. */
+int verbose=0;
+
+extern void session_loop(void);
+void spawn_another_worker_thread(void);
+
+
+void DestroyHttpHeaderHandler(void *V)
+{
+ OneHttpHeader *pHdr;
+ pHdr = (OneHttpHeader*) V;
+ FreeStrBuf(&pHdr->Val);
+ free(pHdr);
+}
+
+void shutdown_sessions(void)
+{
+ wcsession *sptr;
+
+ for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
+ sptr->killthis = 1;
+ }
+}
+
+void do_housekeeping(void)
+{
+ wcsession *sptr, *ss;
+ wcsession *sessions_to_kill = NULL;
+ time_t the_time;
+
+ /*
+ * Lock the session list, moving any candidates for euthanasia into
+ * a separate list.
+ */
+ the_time = 0;
+ CtdlLogResult(pthread_mutex_lock(&SessionListMutex));
+ for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
+ if (the_time == 0)
+ the_time = time(NULL);
+ /* Kill idle sessions */
+ if ((sptr->inuse == 0) &&
+ ((the_time - (sptr->lastreq)) > (time_t) WEBCIT_TIMEOUT))
+ {
+ syslog(LOG_DEBUG, "Timeout session %d", sptr->wc_session);
+ sptr->killthis = 1;
+ }
+
+ /* Remove sessions flagged for kill */
+ if (sptr->killthis) {
+
+ /* remove session from linked list */
+ if (sptr == SessionList) {
+ SessionList = SessionList->next;
+ }
+ else for (ss=SessionList;ss!=NULL;ss=ss->next) {
+ if (ss->next == sptr) {
+ ss->next = ss->next->next;
+ }
+ }
+
+ sptr->next = sessions_to_kill;
+ sessions_to_kill = sptr;
+ }
+ }
+ CtdlLogResult(pthread_mutex_unlock(&SessionListMutex));
+
+ /*
+ * Now free up and destroy the culled sessions.
+ */
+ while (sessions_to_kill != NULL) {
+ syslog(LOG_DEBUG, "Destroying session %d", sessions_to_kill->wc_session);
+ sptr = sessions_to_kill->next;
+ session_destroy_modules(&sessions_to_kill);
+ sessions_to_kill = sptr;
+ }
+}
+
+/*
+ * Check the size of our thread pool. If all threads are executing, spawn another.
+ */
+void check_thread_pool_size(void)
+{
+ if (time_to_die) return; /* don't expand the thread pool during shutdown */
+
+ begin_critical_section(S_SPAWNER); /* only one of these should run at a time */
+ if (
+ (num_threads_executing >= num_threads_existing)
+ && (num_threads_existing < MAX_WORKER_THREADS)
+ ) {
+ syslog(LOG_DEBUG, "%d of %d threads are executing. Adding another worker thread.",
+ num_threads_executing,
+ num_threads_existing
+ );
+ spawn_another_worker_thread();
+ }
+ end_critical_section(S_SPAWNER);
+}
+
+
+/*
+ * Wake up occasionally and clean house
+ */
+void housekeeping_loop(void)
+{
+ while (1) {
+ sleeeeeeeeeep(HOUSEKEEPING);
+ do_housekeeping();
+ }
+}
+
+
+/*
+ * Create a Session id
+ * Generate a unique WebCit session ID (which is not the same thing as the
+ * Citadel session ID).
+ */
+int GenerateSessionID(void)
+{
+ static int seq = (-1);
+
+ if (seq < 0) {
+ seq = (int) time(NULL);
+ }
+
+ return ++seq;
+}
+
+wcsession *FindSession(wcsession **wclist, ParsedHttpHdrs *Hdr, pthread_mutex_t *ListMutex)
+{
+ wcsession *sptr = NULL;
+ wcsession *TheSession = NULL;
+
+ if (Hdr->HR.got_auth == AUTH_BASIC) {
+ GetAuthBasic(Hdr);
+ }
+
+ CtdlLogResult(pthread_mutex_lock(ListMutex));
+ for (sptr = *wclist; ((sptr != NULL) && (TheSession == NULL)); sptr = sptr->next) {
+
+ /* If HTTP-AUTH, look for a session with matching credentials */
+ switch (Hdr->HR.got_auth)
+ {
+ case AUTH_BASIC:
+ if ( (!strcasecmp(ChrPtr(Hdr->c_username), ChrPtr(sptr->wc_username)))
+ && (!strcasecmp(ChrPtr(Hdr->c_password), ChrPtr(sptr->wc_password)))
+ && (sptr->killthis == 0)
+ ) {
+ if (verbose)
+ syslog(LOG_DEBUG, "Matched a session with the same http-auth");
+ TheSession = sptr;
+ }
+ break;
+ case AUTH_COOKIE:
+ /* If cookie-session, look for a session with matching session ID */
+ if ( (Hdr->HR.desired_session != 0)
+ && (sptr->wc_session == Hdr->HR.desired_session)
+ ) {
+ if (verbose)
+ syslog(LOG_DEBUG, "Matched a session with the same cookie");
+ TheSession = sptr;
+ }
+ break;
+ case NO_AUTH:
+ /* Any unbound session is a candidate */
+ if ( (sptr->wc_session == 0) && (sptr->inuse == 0) ) {
+ if (verbose)
+ syslog(LOG_DEBUG, "Reusing an unbound session");
+ TheSession = sptr;
+ }
+ break;
+ }
+ }
+ CtdlLogResult(pthread_mutex_unlock(ListMutex));
+ if (TheSession == NULL) {
+ syslog(LOG_DEBUG, "No existing session was matched");
+ }
+ return TheSession;
+}
+
+wcsession *CreateSession(int Lockable, int Static, wcsession **wclist, ParsedHttpHdrs *Hdr, pthread_mutex_t *ListMutex)
+{
+ wcsession *TheSession;
+ TheSession = (wcsession *) malloc(sizeof(wcsession));
+ memset(TheSession, 0, sizeof(wcsession));
+ TheSession->Hdr = Hdr;
+ TheSession->serv_sock = (-1);
+ TheSession->lastreq = time(NULL);;
+
+ pthread_setspecific(MyConKey, (void *)TheSession);
+
+ /* If we're recreating a session that expired, it's best to give it the same
+ * session number that it had before. The client browser ought to pick up
+ * the new session number and start using it, but in some rare situations it
+ * doesn't, and that's a Bad Thing because it causes lots of spurious sessions
+ * to get created.
+ */
+ if (Hdr->HR.desired_session == 0) {
+ TheSession->wc_session = GenerateSessionID();
+ syslog(LOG_DEBUG, "Created new session %d", TheSession->wc_session);
+ }
+ else {
+ TheSession->wc_session = Hdr->HR.desired_session;
+ syslog(LOG_DEBUG, "Re-created session %d", TheSession->wc_session);
+ }
+ Hdr->HR.Static = Static;
+ session_new_modules(TheSession);
+
+ if (Lockable) {
+ pthread_mutex_init(&TheSession->SessionMutex, NULL);
+
+ if (ListMutex != NULL)
+ CtdlLogResult(pthread_mutex_lock(ListMutex));
+
+ if (wclist != NULL) {
+ TheSession->nonce = rand();
+ TheSession->next = *wclist;
+ *wclist = TheSession;
+ }
+ if (ListMutex != NULL)
+ CtdlLogResult(pthread_mutex_unlock(ListMutex));
+ }
+ return TheSession;
+}
+
+
+/* If it's a "force 404" situation then display the error and bail. */
+void do_404(void)
+{
+ hprintf("HTTP/1.1 404 Not found\r\n");
+ hprintf("Content-Type: text/plain\r\n");
+ wc_printf("Not found\r\n");
+ end_burst();
+}
+
+int ReadHttpSubject(ParsedHttpHdrs *Hdr, StrBuf *Line, StrBuf *Buf)
+{
+ const char *Args;
+ void *vLine, *vHandler;
+ const char *Pos = NULL;
+
+ Hdr->HR.ReqLine = Line;
+ /* The requesttype... GET, POST... */
+ StrBufExtract_token(Buf, Hdr->HR.ReqLine, 0, ' ');
+ if (GetHash(HttpReqTypes, SKEY(Buf), &vLine) &&
+ (vLine != NULL))
+ {
+ Hdr->HR.eReqType = *(long*)vLine;
+ }
+ else {
+ Hdr->HR.eReqType = eGET;
+ return 1;
+ }
+ StrBufCutLeft(Hdr->HR.ReqLine, StrLength(Buf) + 1);
+
+ /* the HTTP Version... */
+ StrBufExtract_token(Buf, Hdr->HR.ReqLine, 1, ' ');
+ StrBufCutRight(Hdr->HR.ReqLine, StrLength(Buf) + 1);
+
+ if (StrLength(Buf) == 0) {
+ Hdr->HR.eReqType = eGET;
+ return 1;
+ }
+
+ StrBufAppendBuf(Hdr->this_page, Hdr->HR.ReqLine, 0);
+
+ /* chop Filename / query arguments */
+ Args = strchr(ChrPtr(Hdr->HR.ReqLine), '?');
+ if (Args == NULL) /* whe're not that picky about params... TODO: this will spoil '&' in filenames.*/
+ Args = strchr(ChrPtr(Hdr->HR.ReqLine), '&');
+ if (Args != NULL) {
+ Args ++; /* skip the ? */
+ StrBufPlain(Hdr->PlainArgs,
+ Args,
+ StrLength(Hdr->HR.ReqLine) -
+ (Args - ChrPtr(Hdr->HR.ReqLine)));
+ StrBufCutAt(Hdr->HR.ReqLine, 0, Args - 1);
+ } /* don't parse them yet, maybe we don't even care... */
+
+ /* now lookup what we are going to do with this... */
+ /* skip first slash */
+ StrBufExtract_NextToken(Buf, Hdr->HR.ReqLine, &Pos, '/');
+ do {
+ StrBufExtract_NextToken(Buf, Hdr->HR.ReqLine, &Pos, '/');
+
+ GetHash(HandlerHash, SKEY(Buf), &vHandler),
+ Hdr->HR.Handler = (WebcitHandler*) vHandler;
+ if (Hdr->HR.Handler == NULL)
+ break;
+ /*
+ * If the request is prefixed by "/webcit" then chop that off. This
+ * allows a front end web server to forward all /webcit requests to us
+ * while still using the same web server port for other things.
+ */
+ if ((Hdr->HR.Handler->Flags & URLNAMESPACE) != 0)
+ continue;
+ break;
+ } while (1);
+ /* remove the handlername from the URL */
+ if ((Pos != NULL) && (Pos != StrBufNOTNULL)){
+ StrBufCutLeft(Hdr->HR.ReqLine,
+ Pos - ChrPtr(Hdr->HR.ReqLine));
+ }
+
+ if (Hdr->HR.Handler != NULL) {
+ if ((Hdr->HR.Handler->Flags & BOGUS) != 0) {
+ return 1;
+ }
+ Hdr->HR.DontNeedAuth = (
+ ((Hdr->HR.Handler->Flags & ISSTATIC) != 0) ||
+ ((Hdr->HR.Handler->Flags & ANONYMOUS) != 0)
+ );
+ }
+ else {
+ /* If this is a "flat" request for the root, display the configured landing page. */
+ int return_value;
+ StrBuf *NewLine = NewStrBuf();
+ Hdr->HR.DontNeedAuth = 1;
+ StrBufAppendPrintf(NewLine, "GET /landing?go=%s?failvisibly=1 HTTP/1.0", ChrPtr(Buf));
+ if (verbose) syslog(LOG_DEBUG, "Replacing with: %s", ChrPtr(NewLine));
+ return_value = ReadHttpSubject(Hdr, NewLine, Buf);
+ FreeStrBuf(&NewLine);
+ return return_value;
+ }
+
+ return 0;
+}
+
+int AnalyseHeaders(ParsedHttpHdrs *Hdr) {
+ OneHttpHeader *pHdr;
+ void *vHdr;
+ long HKLen;
+ const char *HashKey;
+ HashPos *at = GetNewHashPos(Hdr->HTTPHeaders, 0);
+
+ while (GetNextHashPos(Hdr->HTTPHeaders, at, &HKLen, &HashKey, &vHdr) &&
+ (vHdr != NULL)) {
+ pHdr = (OneHttpHeader *)vHdr;
+ if (pHdr->HaveEvaluator)
+ pHdr->H(pHdr->Val, Hdr);
+
+ }
+ DeleteHashPos(&at);
+ return 0;
+}
+
+
+/*
+ * Read in the request
+ */
+int ReadHTTPRequest(ParsedHttpHdrs *Hdr) {
+ const char *pch, *pchs, *pche;
+ OneHttpHeader *pHdr;
+ StrBuf *Line, *LastLine, *HeaderName;
+ int nLine = 0;
+ void *vF;
+ int isbogus = 0;
+
+ HeaderName = NewStrBuf();
+ LastLine = NULL;
+ do {
+ nLine ++;
+ Line = NewStrBufPlain(NULL, SIZ / 4);
+
+ if (ClientGetLine(Hdr, Line) < 0) {
+ FreeStrBuf(&Line);
+ isbogus = 1;
+ break;
+ }
+
+ if (StrLength(Line) == 0) {
+ FreeStrBuf(&Line);
+ continue;
+ }
+ if (nLine == 1) {
+ Hdr->HTTPHeaders = NewHash(1, NULL);
+ pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
+ memset(pHdr, 0, sizeof(OneHttpHeader));
+ pHdr->Val = Line;
+ Put(Hdr->HTTPHeaders, HKEY("GET /"), pHdr, DestroyHttpHeaderHandler);
+ if (verbose || strstr(ChrPtr(Line), "sslg") == NULL) {
+ syslog(LOG_DEBUG, "%s", ChrPtr(Line));
+ }
+ isbogus = ReadHttpSubject(Hdr, Line, HeaderName);
+ if (isbogus) break;
+ continue;
+ }
+
+ /* Do we need to Unfold? */
+ if ((LastLine != NULL) && (isspace(*ChrPtr(Line)))) {
+ pch = pchs = ChrPtr(Line);
+ pche = pchs + StrLength(Line);
+ while (isspace(*pch) && (pch < pche)) {
+ pch ++;
+ }
+ StrBufCutLeft(Line, pch - pchs);
+ StrBufAppendBuf(LastLine, Line, 0);
+
+ FreeStrBuf(&Line);
+ continue;
+ }
+
+ StrBufSanitizeAscii(Line, (char)0xa7);
+ StrBufExtract_token(HeaderName, Line, 0, ':');
+
+ pchs = ChrPtr(Line);
+ pche = pchs + StrLength(Line);
+ pch = pchs + StrLength(HeaderName) + 1;
+ pche = pchs + StrLength(Line);
+ while ((pch < pche) && isspace(*pch)) {
+ pch ++;
+ }
+ StrBufCutLeft(Line, pch - pchs);
+ StrBufUpCase(HeaderName);
+
+ pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
+ memset(pHdr, 0, sizeof(OneHttpHeader));
+ pHdr->Val = Line;
+
+ if (GetHash(HttpHeaderHandler, SKEY(HeaderName), &vF) && (vF != NULL)) {
+ OneHttpHeader *FHdr = (OneHttpHeader*) vF;
+ pHdr->H = FHdr->H;
+ pHdr->HaveEvaluator = 1;
+ }
+ Put(Hdr->HTTPHeaders, SKEY(HeaderName), pHdr, DestroyHttpHeaderHandler);
+ LastLine = Line;
+ } while (Line != NULL);
+
+ FreeStrBuf(&HeaderName);
+
+ return isbogus;
+}
+
+void OverrideRequest(ParsedHttpHdrs *Hdr, const char *Line, long len)
+{
+ StrBuf *Buf = NewStrBuf();
+
+ if (Hdr->HR.ReqLine != NULL) {
+ FlushStrBuf(Hdr->HR.ReqLine);
+ StrBufPlain(Hdr->HR.ReqLine, Line, len);
+ }
+ else {
+ Hdr->HR.ReqLine = NewStrBufPlain(Line, len);
+ }
+ ReadHttpSubject(Hdr, Hdr->HR.ReqLine, Buf);
+
+ FreeStrBuf(&Buf);
+}
+
+/*
+ * handle one request
+ *
+ * This loop gets called once for every HTTP connection made to WebCit. At
+ * this entry point we have an HTTP socket with a browser allegedly on the
+ * other end, but we have not yet bound to a WebCit session.
+ *
+ * The job of this function is to locate the correct session and bind to it,
+ * or create a session if necessary and bind to it, then run the WebCit
+ * transaction loop. Afterwards, we unbind from the session. When this
+ * function returns, the worker thread is then free to handle another
+ * transaction.
+ */
+void context_loop(ParsedHttpHdrs *Hdr) {
+ int isbogus = 0;
+ wcsession *TheSession;
+ struct timeval tx_start;
+ struct timeval tx_finish;
+ int session_may_be_reused = 1;
+ time_t now;
+
+ gettimeofday(&tx_start, NULL); /* start a stopwatch for performance timing */
+
+ /*
+ * Find out what it is that the web browser is asking for
+ */
+ isbogus = ReadHTTPRequest(Hdr);
+
+ Hdr->HR.dav_depth = 32767; /* TODO: find a general way to have non-0 defaults */
+
+ if (!isbogus) {
+ isbogus = AnalyseHeaders(Hdr);
+ }
+
+ if ( (isbogus)
+ || ((Hdr->HR.Handler != NULL)
+ && ((Hdr->HR.Handler->Flags & BOGUS) != 0))
+ ) {
+ wcsession *Bogus;
+ Bogus = CreateSession(0, 1, NULL, Hdr, NULL);
+ do_404();
+ syslog(LOG_WARNING, "HTTP: 404 [%ld.%06ld] %s %s",
+ ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
+ ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
+ ReqStrs[Hdr->HR.eReqType],
+ ChrPtr(Hdr->this_page)
+ );
+ session_detach_modules(Bogus);
+ session_destroy_modules(&Bogus);
+ return;
+ }
+
+ if ((Hdr->HR.Handler != NULL) && ((Hdr->HR.Handler->Flags & ISSTATIC) != 0)) {
+ wcsession *Static;
+ Static = CreateSession(0, 1, NULL, Hdr, NULL);
+
+ Hdr->HR.Handler->F();
+
+ /* How long did this transaction take? */
+ gettimeofday(&tx_finish, NULL);
+
+ if (verbose)
+ syslog(LOG_DEBUG, "HTTP: 200 [%ld.%06ld] %s %s",
+ ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
+ ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
+ ReqStrs[Hdr->HR.eReqType],
+ ChrPtr(Hdr->this_page)
+ );
+ session_detach_modules(Static);
+ session_destroy_modules(&Static);
+ return;
+ }
+
+ if (Hdr->HR.got_auth == AUTH_BASIC) {
+ CheckAuthBasic(Hdr);
+ }
+
+ if (Hdr->HR.got_auth) {
+ session_may_be_reused = 0;
+ }
+
+ /*
+ * See if there's an existing session open with any of:
+ * - The desired Session ID
+ * - A matching http-auth username and password
+ * - An unbound session flagged as reusable
+ */
+ TheSession = FindSession(&SessionList, Hdr, &SessionListMutex);
+
+ /*
+ * If there were no qualifying sessions, then create a new one.
+ */
+ if ((TheSession == NULL) || (TheSession->killthis != 0)) {
+ TheSession = CreateSession(1, 0, &SessionList, Hdr, &SessionListMutex);
+ }
+
+ /*
+ * Reject transactions which require http-auth, if http-auth was not provided
+ */
+ if ( (StrLength(Hdr->c_username) == 0)
+ && (!Hdr->HR.DontNeedAuth)
+ && (Hdr->HR.Handler != NULL)
+ && ((XHTTP_COMMANDS & Hdr->HR.Handler->Flags) == XHTTP_COMMANDS)
+ ) {
+ syslog(LOG_DEBUG, "http-auth required but not provided");
+ OverrideRequest(Hdr, HKEY("GET /401 HTTP/1.0"));
+ Hdr->HR.prohibit_caching = 1;
+ }
+
+ /*
+ * A future improvement might be to check the session integrity
+ * at this point before continuing.
+ */
+
+ /*
+ * Bind to the session and perform the transaction
+ */
+ now = time(NULL);;
+ CtdlLogResult(pthread_mutex_lock(&TheSession->SessionMutex));
+ pthread_setspecific(MyConKey, (void *)TheSession);
+
+ TheSession->inuse = 1; /* mark the session as bound */
+ TheSession->isFailure = 0; /* reset evntually existing error flags */
+ TheSession->lastreq = now; /* log */
+ TheSession->Hdr = Hdr;
+
+ /*
+ * If a language was requested via a cookie, select that language now.
+ */
+ if (StrLength(Hdr->c_language) > 0) {
+ if (verbose) {
+ syslog(LOG_DEBUG, "Session cookie requests language '%s'", ChrPtr(Hdr->c_language));
+ }
+ set_selected_language(ChrPtr(Hdr->c_language));
+ go_selected_language();
+ }
+
+ /*
+ * do the transaction
+ */
+ session_attach_modules(TheSession);
+ session_loop();
+
+ /* How long did this transaction take? */
+ gettimeofday(&tx_finish, NULL);
+
+ if (verbose || strstr(ChrPtr(Hdr->this_page), "sslg") == NULL) {
+ syslog(LOG_INFO, "HTTP: 200 [%ld.%06ld] %s %s",
+ ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
+ ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
+ ReqStrs[Hdr->HR.eReqType],
+ ChrPtr(Hdr->this_page)
+ );
+ }
+ session_detach_modules(TheSession);
+
+ /* If *this* very transaction did not explicitly specify a session cookie,
+ * and it did not log in, we want to flag the session as a candidate for
+ * re-use by the next unbound client that comes along. This keeps our session
+ * table from getting bombarded with new sessions when, for example, a web
+ * spider crawls the site without using cookies.
+ */
+ if ((session_may_be_reused) && (!TheSession->logged_in)) {
+ TheSession->wc_session = 0; /* flag as available for re-use */
+ TheSession->selected_language = -1; /* clear any non-default language setting */
+ }
+
+ TheSession->Hdr = NULL;
+ TheSession->inuse = 0; /* mark the session as unbound */
+ CtdlLogResult(pthread_mutex_unlock(&TheSession->SessionMutex));
+}
+
+void tmplput_nonce(StrBuf *Target, WCTemplputParams *TP)
+{
+ wcsession *WCC = WC;
+ StrBufAppendPrintf(Target, "%ld",
+ (WCC != NULL)? WCC->nonce:0);
+}
+
+void tmplput_current_user(StrBuf *Target, WCTemplputParams *TP)
+{
+ StrBufAppendTemplate(Target, TP, WC->wc_fullname, 0);
+}
+
+void Header_HandleContentLength(StrBuf *Line, ParsedHttpHdrs *hdr)
+{
+ hdr->HR.ContentLength = StrToi(Line);
+}
+
+void Header_HandleContentType(StrBuf *Line, ParsedHttpHdrs *hdr)
+{
+ hdr->HR.ContentType = Line;
+}
+
+
+void Header_HandleHost(StrBuf *Line, ParsedHttpHdrs *hdr)
+{
+ if (hdr->HostHeader != NULL) {
+ FreeStrBuf(&hdr->HostHeader);
+ }
+ hdr->HostHeader = NewStrBuf();
+ StrBufAppendPrintf(hdr->HostHeader, "%s://", (is_https ? "https" : "http") );
+ StrBufAppendBuf(hdr->HostHeader, Line, 0);
+}
+
+void Header_HandleXFFHost(StrBuf *Line, ParsedHttpHdrs *hdr)
+{
+ if (!follow_xff) return;
+
+ if (hdr->HostHeader != NULL) {
+ FreeStrBuf(&hdr->HostHeader);
+ }
+
+ hdr->HostHeader = NewStrBuf();
+ StrBufAppendPrintf(hdr->HostHeader, "http://"); /* this is naive; do something about it */
+ StrBufAppendBuf(hdr->HostHeader, Line, 0);
+}
+
+
+void Header_HandleXFF(StrBuf *Line, ParsedHttpHdrs *hdr)
+{
+ hdr->HR.browser_host = Line;
+
+ while (StrBufNum_tokens(hdr->HR.browser_host, ',') > 1) {
+ StrBufRemove_token(hdr->HR.browser_host, 0, ',');
+ }
+ StrBufTrim(hdr->HR.browser_host);
+}
+
+void Header_HandleIfModSince(StrBuf *Line, ParsedHttpHdrs *hdr)
+{
+ hdr->HR.if_modified_since = httpdate_to_timestamp(Line);
+}
+
+void Header_HandleAcceptEncoding(StrBuf *Line, ParsedHttpHdrs *hdr)
+{
+ /*
+ * Can we compress?
+ */
+ if (strstr(&ChrPtr(Line)[16], "gzip")) {
+ hdr->HR.gzip_ok = 1;
+ }
+}
+
+void Header_HandleContentRange(StrBuf *Line, ParsedHttpHdrs *hdr)
+{
+ const char *PRange = ChrPtr(Line);
+
+ while ((*PRange != '=') && (*PRange != '\0'))
+ PRange ++;
+ if (*PRange == '=')
+ PRange ++;
+ if ((*PRange == '\0'))
+ return;
+ hdr->HaveRange = 1;
+ hdr->RangeStart = atol(PRange);
+
+ while (isdigit(*PRange))
+ PRange++;
+
+ if (*PRange == '-')
+ PRange ++;
+ if ((*PRange == '\0'))
+ hdr->RangeTil = -1;
+ else
+ hdr->RangeTil = atol(PRange);
+}
+
+const char *ReqStrs[eNONE] = {
+ "GET",
+ "POST",
+ "OPTIONS",
+ "PROPFIND",
+ "PUT",
+ "DELETE",
+ "HEAD",
+ "MOVE",
+ "COPY",
+ "REPORT"
+};
+
+void
+ServerStartModule_CONTEXT
+(void)
+{
+ long *v;
+ HttpReqTypes = NewHash(1, NULL);
+ HttpHeaderHandler = NewHash(1, NULL);
+
+ v = malloc(sizeof(long));
+ *v = eGET;
+ Put(HttpReqTypes, HKEY("GET"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = ePOST;
+ Put(HttpReqTypes, HKEY("POST"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = eOPTIONS;
+ Put(HttpReqTypes, HKEY("OPTIONS"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = ePROPFIND;
+ Put(HttpReqTypes, HKEY("PROPFIND"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = ePUT;
+ Put(HttpReqTypes, HKEY("PUT"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = eDELETE;
+ Put(HttpReqTypes, HKEY("DELETE"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = eHEAD;
+ Put(HttpReqTypes, HKEY("HEAD"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = eMOVE;
+ Put(HttpReqTypes, HKEY("MOVE"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = eCOPY;
+ Put(HttpReqTypes, HKEY("COPY"), v, NULL);
+
+ v = malloc(sizeof(long));
+ *v = eREPORT;
+ Put(HttpReqTypes, HKEY("REPORT"), v, NULL);
+}
+
+void
+ServerShutdownModule_CONTEXT
+(void)
+{
+ DeleteHash(&HttpReqTypes);
+ DeleteHash(&HttpHeaderHandler);
+}
+
+void RegisterHeaderHandler(const char *Name, long Len, Header_Evaluator F)
+{
+ OneHttpHeader *pHdr;
+ pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
+ memset(pHdr, 0, sizeof(OneHttpHeader));
+ pHdr->H = F;
+ Put(HttpHeaderHandler, Name, Len, pHdr, DestroyHttpHeaderHandler);
+}
+
+
+void
+InitModule_CONTEXT
+(void)
+{
+ RegisterHeaderHandler(HKEY("RANGE"), Header_HandleContentRange);
+ RegisterHeaderHandler(HKEY("CONTENT-LENGTH"), Header_HandleContentLength);
+ RegisterHeaderHandler(HKEY("CONTENT-TYPE"), Header_HandleContentType);
+ RegisterHeaderHandler(HKEY("X-FORWARDED-HOST"), Header_HandleXFFHost); /* Apache way... */
+ RegisterHeaderHandler(HKEY("X-REAL-IP"), Header_HandleXFFHost); /* NGinX way... */
+ RegisterHeaderHandler(HKEY("HOST"), Header_HandleHost);
+ RegisterHeaderHandler(HKEY("X-FORWARDED-FOR"), Header_HandleXFF);
+ RegisterHeaderHandler(HKEY("ACCEPT-ENCODING"), Header_HandleAcceptEncoding);
+ RegisterHeaderHandler(HKEY("IF-MODIFIED-SINCE"), Header_HandleIfModSince);
+
+ RegisterNamespace("CURRENT_USER", 0, 1, tmplput_current_user, NULL, CTX_NONE);
+ RegisterNamespace("NONCE", 0, 0, tmplput_nonce, NULL, 0);
+
+ WebcitAddUrlHandler(HKEY("404"), "", 0, do_404, ANONYMOUS|COOKIEUNNEEDED);
+/*
+ * Look for commonly-found probes of malware such as worms, viruses, trojans, and Microsoft Office.
+ * Short-circuit these requests so we don't have to send them through the full processing loop.
+ */
+ WebcitAddUrlHandler(HKEY("scripts"), "", 0, do_404, ANONYMOUS|BOGUS); /* /root.exe - Worms and trojans and viruses, oh my! */
+ WebcitAddUrlHandler(HKEY("c"), "", 0, do_404, ANONYMOUS|BOGUS); /* /winnt */
+ WebcitAddUrlHandler(HKEY("MSADC"), "", 0, do_404, ANONYMOUS|BOGUS);
+ WebcitAddUrlHandler(HKEY("_vti"), "", 0, do_404, ANONYMOUS|BOGUS); /* Broken Microsoft DAV implementation */
+ WebcitAddUrlHandler(HKEY("MSOffice"), "", 0, do_404, ANONYMOUS|BOGUS); /* Stoopid MSOffice thinks everyone is IIS */
+ WebcitAddUrlHandler(HKEY("nonexistenshit"), "", 0, do_404, ANONYMOUS|BOGUS); /* Exploit found in the wild January 2009 */
+}
+
+
+void
+HttpNewModule_CONTEXT
+(ParsedHttpHdrs *httpreq)
+{
+ httpreq->PlainArgs = NewStrBufPlain(NULL, SIZ);
+ httpreq->this_page = NewStrBufPlain(NULL, SIZ);
+}
+
+void
+HttpDetachModule_CONTEXT
+(ParsedHttpHdrs *httpreq)
+{
+ FlushStrBuf(httpreq->PlainArgs);
+ FlushStrBuf(httpreq->HostHeader);
+ FlushStrBuf(httpreq->this_page);
+ FlushStrBuf(httpreq->PlainArgs);
+ DeleteHash(&httpreq->HTTPHeaders);
+ memset(&httpreq->HR, 0, sizeof(HdrRefs));
+}
+
+void
+HttpDestroyModule_CONTEXT
+(ParsedHttpHdrs *httpreq)
+{
+ FreeStrBuf(&httpreq->this_page);
+ FreeStrBuf(&httpreq->PlainArgs);
+ FreeStrBuf(&httpreq->this_page);
+ FreeStrBuf(&httpreq->PlainArgs);
+ FreeStrBuf(&httpreq->HostHeader);
+ DeleteHash(&httpreq->HTTPHeaders);
+
+}
projects / citadel.git / blobdiff