/* Copyright 1988, 1998 The Open Group Copyright 2002 Sun Microsystems, Inc. All rights reserved. Copyright 2001-2004 Oswald Buddenhagen Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of a copyright holder shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the copyright holder. */ /* * xdm - display manager daemon * Author: Keith Packard, MIT X Consortium * * xdmcp.c - Support for XDMCP */ #include #ifdef XDMCP #include "dm.h" #include "dm_error.h" #include "dm_auth.h" #include "dm_socket.h" #include #include #include #if defined(IPv6) && defined(AF_INET6) # include #endif /* * Forward reference */ static void broadcast_respond( struct sockaddr *from, int fromlen, int length, int fd ); static void forward_respond (struct sockaddr *from, int fromlen, int length, int fd); static void manage( struct sockaddr *from, int fromlen, int length, int fd ); static void query_respond( struct sockaddr *from, int fromlen, int length, int fd ); static void request_respond( struct sockaddr *from, int fromlen, int length, int fd ); static void send_accept( struct sockaddr *to, int tolen, CARD32 sessionID, ARRAY8Ptr authenticationName, ARRAY8Ptr authenticationData, ARRAY8Ptr authorizationName, ARRAY8Ptr authorizationData, int fd ); static void send_alive( struct sockaddr *from, int fromlen, int length, int fd ); static void send_decline( struct sockaddr *to, int tolen, ARRAY8Ptr authenticationName, ARRAY8Ptr authenticationData, ARRAY8Ptr status, int fd ); static void send_failed( struct sockaddr *from, int fromlen, const char *name, CARD32 sessionID, const char *reason, int fd ); static void send_refuse( struct sockaddr *from, int fromlen, CARD32 sessionID, int fd ); static void send_unwilling( struct sockaddr *from, int fromlen, ARRAY8Ptr authenticationName, ARRAY8Ptr status, int fd ); static void send_willing( struct sockaddr *from, int fromlen, ARRAY8Ptr authenticationName, ARRAY8Ptr status, int fd ); static XdmcpBuffer buffer; static void sendForward( CARD16 connectionType, ARRAY8Ptr address, char *closure ) { #ifdef AF_INET struct sockaddr_in in_addr; #endif #if defined(IPv6) && defined(AF_INET6) struct sockaddr_in6 in6_addr; #endif #ifdef AF_DECnet #endif struct sockaddr *addr; int addrlen; switch (connectionType) { #ifdef AF_INET case FamilyInternet: addr = (struct sockaddr *)&in_addr; bzero( (char *)&in_addr, sizeof(in_addr) ); # ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN in_addr.sin_len = sizeof(in_addr); # endif in_addr.sin_family = AF_INET; in_addr.sin_port = htons( (short)XDM_UDP_PORT ); if (address->length != 4) return; memmove( (char *)&in_addr.sin_addr, address->data, address->length ); addrlen = sizeof(struct sockaddr_in); break; #endif #if defined(IPv6) && defined(AF_INET6) case FamilyInternet6: addr = (struct sockaddr *)&in6_addr; bzero( (char *)&in6_addr, sizeof(in6_addr) ); # ifdef SIN6_LEN in6_addr.sin6_len = sizeof(in6_addr); # endif in6_addr.sin6_family = AF_INET6; in6_addr.sin6_port = htons( (short)XDM_UDP_PORT ); if (address->length != 16) return; memmove( (char *)&in6_addr.sin6_addr, address->data, address->length ); addrlen = sizeof(struct sockaddr_in6); break; #endif #ifdef AF_DECnet case FamilyDECnet: #endif default: return; } XdmcpFlush( (int)closure, &buffer, (XdmcpNetaddr)addr, addrlen ); return; } static void ClientAddress( struct sockaddr *from, ARRAY8Ptr addr, /* return */ ARRAY8Ptr port, /* return */ CARD16 *type ) /* return */ { int length, family; char *data; data = NetaddrPort( (XdmcpNetaddr)from, &length ); XdmcpAllocARRAY8( port, length ); memmove( port->data, data, length ); port->length = length; family = ConvertAddr( (XdmcpNetaddr)from, &length, &data ); XdmcpAllocARRAY8( addr, length ); memmove( addr->data, data, length ); addr->length = length; *type = family; } static void all_query_respond( struct sockaddr *from, int fromlen, ARRAYofARRAY8Ptr authenticationNames, xdmOpCode type, int fd ) { ARRAY8Ptr authenticationName; ARRAY8 status; ARRAY8 addr; CARD16 connectionType; int family; int length; family = ConvertAddr( (XdmcpNetaddr)from, &length, &(addr.data) ); addr.length = length; /* convert int to short */ Debug( "all_query_respond: conntype=%d, addr=%02[*:hhx\n", family, addr.length, addr.data ); if (family < 0) return; connectionType = family; if (type == INDIRECT_QUERY) RememberIndirectClient( &addr, connectionType ); else ForgetIndirectClient( &addr, connectionType ); authenticationName = ChooseAuthentication( authenticationNames ); if (Willing( &addr, connectionType, authenticationName, &status, type )) send_willing( from, fromlen, authenticationName, &status, fd ); else if (type == QUERY) send_unwilling( from, fromlen, authenticationName, &status, fd ); XdmcpDisposeARRAY8( &status ); } static void indirect_respond( struct sockaddr *from, int fromlen, int length, int fd ) { ARRAYofARRAY8 queryAuthenticationNames; ARRAY8 clientAddress; ARRAY8 clientPort; CARD16 connectionType; int expectedLen; int i; XdmcpHeader header; int localHostAsWell; Debug( " respond %d\n", length ); if (!XdmcpReadARRAYofARRAY8( &buffer, &queryAuthenticationNames )) return; expectedLen = 1; for (i = 0; i < (int)queryAuthenticationNames.length; i++) expectedLen += 2 + queryAuthenticationNames.data[i].length; if (length == expectedLen) { ClientAddress( from, &clientAddress, &clientPort, &connectionType ); /* * set up the forward query packet */ header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16)FORWARD_QUERY; header.length = 0; header.length += 2 + clientAddress.length; header.length += 2 + clientPort.length; header.length += 1; for (i = 0; i < (int)queryAuthenticationNames.length; i++) header.length += 2 + queryAuthenticationNames.data[i].length; XdmcpWriteHeader( &buffer, &header ); XdmcpWriteARRAY8( &buffer, &clientAddress ); XdmcpWriteARRAY8( &buffer, &clientPort ); XdmcpWriteARRAYofARRAY8( &buffer, &queryAuthenticationNames ); localHostAsWell = ForEachMatchingIndirectHost( &clientAddress, connectionType, sendForward, (char *)fd ); XdmcpDisposeARRAY8( &clientAddress ); XdmcpDisposeARRAY8( &clientPort ); if (localHostAsWell) all_query_respond( from, fromlen, &queryAuthenticationNames, INDIRECT_QUERY, fd ); } else Debug( " length error got %d expect %d\n", length, expectedLen ); XdmcpDisposeARRAYofARRAY8( &queryAuthenticationNames ); } void ProcessRequestSocket( int fd ) { XdmcpHeader header; #if defined(IPv6) && defined(AF_INET6) struct sockaddr_storage addr; #else struct sockaddr addr; #endif int addrlen = sizeof(addr); Debug( "ProcessRequestSocket\n" ); bzero( (char *)&addr, sizeof(addr) ); if (!XdmcpFill( fd, &buffer, (XdmcpNetaddr)&addr, &addrlen )) { Debug( "XdmcpFill failed\n" ); return; } if (!XdmcpReadHeader( &buffer, &header )) { Debug( "XdmcpReadHeader failed\n" ); return; } if (header.version != XDM_PROTOCOL_VERSION) { Debug( "XDMCP header version read was %d, expected %d\n", header.version, XDM_PROTOCOL_VERSION ); return; } Debug( "header: %d %d %d\n", header.version, header.opcode, header.length ); switch (header.opcode) { case BROADCAST_QUERY: broadcast_respond( (struct sockaddr *)&addr, addrlen, header.length, fd ); break; case QUERY: query_respond( (struct sockaddr *)&addr, addrlen, header.length, fd ); break; case INDIRECT_QUERY: indirect_respond( (struct sockaddr *)&addr, addrlen, header.length, fd ); break; case FORWARD_QUERY: forward_respond ((struct sockaddr *)&addr, addrlen, header.length, fd); break; case REQUEST: request_respond( (struct sockaddr *)&addr, addrlen, header.length, fd ); break; case MANAGE: manage( (struct sockaddr *)&addr, addrlen, header.length, fd ); break; case KEEPALIVE: send_alive( (struct sockaddr *)&addr, addrlen, header.length, fd ); break; } } /* * respond to a request on the UDP socket. */ static void direct_query_respond( struct sockaddr *from, int fromlen, int length, xdmOpCode type, int fd ) { ARRAYofARRAY8 queryAuthenticationNames; int expectedLen; int i; if (!XdmcpReadARRAYofARRAY8( &buffer, &queryAuthenticationNames )) return; expectedLen = 1; for (i = 0; i < (int)queryAuthenticationNames.length; i++) expectedLen += 2 + queryAuthenticationNames.data[i].length; if (length == expectedLen) all_query_respond( from, fromlen, &queryAuthenticationNames, type, fd ); XdmcpDisposeARRAYofARRAY8( &queryAuthenticationNames ); } static void query_respond( struct sockaddr *from, int fromlen, int length, int fd ) { Debug( " respond %d\n", length ); direct_query_respond( from, fromlen, length, QUERY, fd ); } static void broadcast_respond( struct sockaddr *from, int fromlen, int length, int fd ) { direct_query_respond( from, fromlen, length, BROADCAST_QUERY, fd ); } /* computes an X display name */ static char * NetworkAddressToName( CARD16 connectionType, ARRAY8Ptr connectionAddress, struct sockaddr *originalAddress, CARD16 displayNumber ) { switch (connectionType) { case FamilyInternet: #if defined(IPv6) && defined(AF_INET6) case FamilyInternet6: #endif { CARD8 *data; struct hostent *hostent; char *hostname = NULL; char *name; const char *localhost; int multiHomed = 0; int type; #if defined(IPv6) && defined(AF_INET6) struct addrinfo *ai = NULL, *nai, hints; char dotted[INET6_ADDRSTRLEN]; if (connectionType == FamilyInternet6) type = AF_INET6; else #endif type = AF_INET; data = connectionAddress->data; hostent = gethostbyaddr( (char *)data, connectionAddress->length, type ); if (hostent) { if (sourceAddress) { #if defined(IPv6) && defined(AF_INET6) bzero( &hints, sizeof(hints) ); hints.ai_flags = AI_CANONNAME; if (!getaddrinfo( hostent->h_name, NULL, &hints, &ai )) { hostname = ai->ai_canonname; for (nai = ai->ai_next; nai; nai = nai->ai_next) if (ai->ai_protocol == nai->ai_protocol && memcmp( ai->ai_addr, nai->ai_addr, ai->ai_addrlen )) multiHomed = 1; } #else hostent = gethostbyname( hostent->h_name ); if (hostent && hostent->h_addrtype == AF_INET) { multiHomed = hostent->h_addr_list[1] != NULL; hostname = hostent->h_name; } #endif } else hostname = hostent->h_name; } localhost = localHostname(); /* * protect against bogus host names */ if (hostname && *hostname && *hostname != '.' && !multiHomed) { if (!strcmp( localhost, hostname )) ASPrintf( &name, "localhost:%d", displayNumber ); else { if (removeDomainname) { char *remoteDot; char *localDot; /* check for a common domain name. This * could reduce names by recognising common * super-domain names as well, but I don't think * this is as useful, and will confuse more * people */ if ((localDot = strchr( localhost, '.' )) && (remoteDot = strchr( hostname, '.' ))) { /* smash the name in place; it won't * be needed later. */ if (!strcmp( localDot+1, remoteDot+1 )) *remoteDot = '\0'; } } ASPrintf( &name, "%s:%d", hostname, displayNumber ); } } else { #if defined(IPv6) && defined(AF_INET6) if (multiHomed) { if (connectionType == FamilyInternet) { data = (CARD8 *) &((struct sockaddr_in *)originalAddress)->sin_addr; } else { data = (CARD8 *) &((struct sockaddr_in6 *)originalAddress)->sin6_addr; } } inet_ntop( type, data, dotted, sizeof(dotted) ); ASPrintf( &name, "%s:%d", dotted, displayNumber ); #else if (multiHomed) data = (CARD8 *) &((struct sockaddr_in *)originalAddress)->sin_addr; ASPrintf( &name, "%[4|'.'hhu:%d", data, displayNumber ); #endif } #if defined(IPv6) && defined(AF_INET6) if (ai) freeaddrinfo( ai ); #endif return name; } #ifdef DNET case FamilyDECnet: return NULL; #endif /* DNET */ default: return NULL; } } /*ARGSUSED*/ static void forward_respond ( struct sockaddr *from, int fromlen ATTR_UNUSED, int length, int fd) { ARRAY8 clientAddress; ARRAY8 clientPort; ARRAYofARRAY8 authenticationNames; struct sockaddr *client; int clientlen; int expectedLen; int i; Debug( " respond %d\n", length ); clientAddress.length = 0; clientAddress.data = 0; clientPort.length = 0; clientPort.data = 0; authenticationNames.length = 0; authenticationNames.data = 0; if (XdmcpReadARRAY8( &buffer, &clientAddress ) && XdmcpReadARRAY8( &buffer, &clientPort ) && XdmcpReadARRAYofARRAY8( &buffer, &authenticationNames )) { expectedLen = 0; expectedLen += 2 + clientAddress.length; expectedLen += 2 + clientPort.length; expectedLen += 1; /* authenticationNames */ for (i = 0; i < (int)authenticationNames.length; i++) expectedLen += 2 + authenticationNames.data[i].length; if (length == expectedLen) { int j; j = 0; for (i = 0; i < (int)clientPort.length; i++) j = j * 256 + clientPort.data[i]; Debug( " client address (port %d) %[*hhu\n", j, clientAddress.length, clientAddress.data ); switch (from->sa_family) { #ifdef AF_INET case AF_INET: { struct sockaddr_in in_addr; if (clientAddress.length != 4 || clientPort.length != 2) goto badAddress; bzero( (char *)&in_addr, sizeof(in_addr) ); #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN in_addr.sin_len = sizeof(in_addr); #endif in_addr.sin_family = AF_INET; memmove( &in_addr.sin_addr, clientAddress.data, 4 ); memmove( (char *)&in_addr.sin_port, clientPort.data, 2 ); client = (struct sockaddr *)&in_addr; clientlen = sizeof(in_addr); all_query_respond( client, clientlen, &authenticationNames, FORWARD_QUERY, fd ); } break; #endif #if defined(IPv6) && defined(AF_INET6) case AF_INET6: { struct sockaddr_in6 in6_addr; if (clientAddress.length != 16 || clientPort.length != 2) goto badAddress; bzero( (char *)&in6_addr, sizeof(in6_addr) ); #ifdef SIN6_LEN in6_addr.sin6_len = sizeof(in6_addr); #endif in6_addr.sin6_family = AF_INET6; memmove( &in6_addr,clientAddress.data,clientAddress.length ); memmove( (char *)&in6_addr.sin6_port, clientPort.data, 2 ); client = (struct sockaddr *)&in6_addr; clientlen = sizeof(in6_addr); all_query_respond( client, clientlen, &authenticationNames, FORWARD_QUERY, fd ); } break; #endif #ifdef AF_UNIX case AF_UNIX: { struct sockaddr_un un_addr; if (clientAddress.length >= sizeof(un_addr.sun_path)) goto badAddress; bzero( (char *)&un_addr, sizeof(un_addr) ); un_addr.sun_family = AF_UNIX; memmove( un_addr.sun_path, clientAddress.data, clientAddress.length ); un_addr.sun_path[clientAddress.length] = '\0'; client = (struct sockaddr *)&un_addr; #if defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN) && !defined(__Lynx__) && defined(UNIXCONN) un_addr.sun_len = strlen( un_addr.sun_path ); clientlen = SUN_LEN( &un_addr ); #else clientlen = sizeof(un_addr); #endif all_query_respond( client, clientlen, &authenticationNames, FORWARD_QUERY, fd ); } break; #endif #ifdef AF_CHAOS case AF_CHAOS: goto badAddress; #endif #ifdef AF_DECnet case AF_DECnet: goto badAddress; #endif } } else Debug( " length error got %d expect %d\n", length, expectedLen ); } badAddress: XdmcpDisposeARRAY8( &clientAddress ); XdmcpDisposeARRAY8( &clientPort ); XdmcpDisposeARRAYofARRAY8( &authenticationNames ); } static ARRAY8 Hostname; static void send_willing( struct sockaddr *from, int fromlen, ARRAY8Ptr authenticationName, ARRAY8Ptr status, int fd ) { XdmcpHeader header; Debug( "send %.*s %.*s\n", authenticationName->length, authenticationName->data, status->length, status->data ); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16)WILLING; header.length = 6 + authenticationName->length + Hostname.length + status->length; XdmcpWriteHeader( &buffer, &header ); XdmcpWriteARRAY8( &buffer, authenticationName ); XdmcpWriteARRAY8( &buffer, &Hostname ); XdmcpWriteARRAY8( &buffer, status ); XdmcpFlush( fd, &buffer, (XdmcpNetaddr)from, fromlen ); } static void send_unwilling( struct sockaddr *from, int fromlen, ARRAY8Ptr authenticationName, ARRAY8Ptr status, int fd ) { XdmcpHeader header; Debug( "send %.*s %.*s\n", authenticationName->length, authenticationName->data, status->length, status->data ); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16)UNWILLING; header.length = 4 + Hostname.length + status->length; XdmcpWriteHeader( &buffer, &header ); XdmcpWriteARRAY8( &buffer, &Hostname ); XdmcpWriteARRAY8( &buffer, status ); XdmcpFlush( fd, &buffer, (XdmcpNetaddr)from, fromlen ); } static unsigned long globalSessionID; #define NextSessionID() (++globalSessionID) void init_session_id( void ) { /* Set randomly so we are unlikely to reuse id's from a previous * incarnation so we don't say "Alive" to those displays. * Start with low digits 0 to make debugging easier. */ globalSessionID = (time( (Time_t *)0 ) & 0x7fff) * 16000; Hostname.data = (char *)localHostname(); Hostname.length = strlen( Hostname.data ); } static ARRAY8 outOfMemory = { (CARD16)13, (CARD8Ptr)"Out of memory" }; static ARRAY8 noValidAddr = { (CARD16)16, (CARD8Ptr)"No valid address" }; static ARRAY8 noValidAuth = { (CARD16)22, (CARD8Ptr)"No valid authorization" }; static ARRAY8 noAuthentic = { (CARD16)29, (CARD8Ptr)"XDM has no authentication key" }; static void request_respond( struct sockaddr *from, int fromlen, int length, int fd ) { CARD16 displayNumber; ARRAY16 connectionTypes; ARRAYofARRAY8 connectionAddresses; ARRAY8 authenticationName; ARRAY8 authenticationData; ARRAYofARRAY8 authorizationNames; ARRAY8 manufacturerDisplayID; ARRAY8Ptr reason = 0; int expectlen; int i, j; struct protoDisplay *pdpy; ARRAY8 authorizationName, authorizationData; ARRAY8Ptr connectionAddress; Debug( " respond %d\n", length ); connectionTypes.data = 0; connectionAddresses.data = 0; authenticationName.data = 0; authenticationData.data = 0; authorizationNames.data = 0; authorizationName.length = 0; authorizationData.length = 0; manufacturerDisplayID.data = 0; if (XdmcpReadCARD16( &buffer, &displayNumber ) && XdmcpReadARRAY16( &buffer, &connectionTypes ) && XdmcpReadARRAYofARRAY8( &buffer, &connectionAddresses ) && XdmcpReadARRAY8( &buffer, &authenticationName ) && XdmcpReadARRAY8( &buffer, &authenticationData ) && XdmcpReadARRAYofARRAY8( &buffer, &authorizationNames ) && XdmcpReadARRAY8( &buffer, &manufacturerDisplayID )) { expectlen = 0; expectlen += 2; /* displayNumber */ expectlen += 1 + 2 * connectionTypes.length; /* connectionTypes */ expectlen += 1; /* connectionAddresses */ for (i = 0; i < (int)connectionAddresses.length; i++) expectlen += 2 + connectionAddresses.data[i].length; expectlen += 2 + authenticationName.length; /* authenticationName */ expectlen += 2 + authenticationData.length; /* authenticationData */ expectlen += 1; /* authoriationNames */ for (i = 0; i < (int)authorizationNames.length; i++) expectlen += 2 + authorizationNames.data[i].length; expectlen += 2 + manufacturerDisplayID.length; /* displayID */ if (expectlen != length) { Debug( " length error got %d expect %d\n", length, expectlen ); goto abort; } if (connectionTypes.length == 0 || connectionAddresses.length != connectionTypes.length) { reason = &noValidAddr; pdpy = 0; goto decline; } pdpy = FindProtoDisplay( (XdmcpNetaddr)from, fromlen, displayNumber ); if (!pdpy) { /* Check this Display against the Manager's policy */ reason = Accept( from, fromlen, displayNumber ); if (reason) goto decline; /* Check the Display's stream services against Manager's policy */ i = SelectConnectionTypeIndex( &connectionTypes, &connectionAddresses ); if (i < 0) { reason = &noValidAddr; goto decline; } /* The Manager considers this a new session */ connectionAddress = &connectionAddresses.data[i]; pdpy = NewProtoDisplay( (XdmcpNetaddr)from, fromlen, displayNumber, connectionTypes.data[i], connectionAddress, NextSessionID() ); Debug( "NewProtoDisplay %p\n", pdpy ); if (!pdpy) { reason = &outOfMemory; goto decline; } } if (authorizationNames.length == 0) j = 0; else j = SelectAuthorizationTypeIndex( &authenticationName, &authorizationNames ); if (j < 0) { reason = &noValidAuth; goto decline; } if (!CheckAuthentication( pdpy, &manufacturerDisplayID, &authenticationName, &authenticationData )) { reason = &noAuthentic; goto decline; } if (j < (int)authorizationNames.length) { Xauth *auth; SetProtoDisplayAuthorization( pdpy, (unsigned short)authorizationNames.data[j].length, (char *)authorizationNames.data[j].data ); auth = pdpy->xdmcpAuthorization; if (!auth) auth = pdpy->fileAuthorization; if (auth) { authorizationName.length = auth->name_length; authorizationName.data = (CARD8Ptr) auth->name; authorizationData.length = auth->data_length; authorizationData.data = (CARD8Ptr) auth->data; } } if (pdpy) { send_accept( from, fromlen, pdpy->sessionID, &authenticationName, &authenticationData, &authorizationName, &authorizationData, fd ); } else { decline: send_decline( from, fromlen, &authenticationName, &authenticationData, reason, fd ); if (pdpy) DisposeProtoDisplay( pdpy ); } } abort: XdmcpDisposeARRAY16( &connectionTypes ); XdmcpDisposeARRAYofARRAY8( &connectionAddresses ); XdmcpDisposeARRAY8( &authenticationName ); XdmcpDisposeARRAY8( &authenticationData ); XdmcpDisposeARRAYofARRAY8( &authorizationNames ); XdmcpDisposeARRAY8( &manufacturerDisplayID ); } static void send_accept( struct sockaddr *to, int tolen, CARD32 sessionID, ARRAY8Ptr authenticationName, ARRAY8Ptr authenticationData, ARRAY8Ptr authorizationName, ARRAY8Ptr authorizationData, int fd ) { XdmcpHeader header; Debug( " session ID %ld\n", (long)sessionID ); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16)ACCEPT; header.length = 4; /* session ID */ header.length += 2 + authenticationName->length; header.length += 2 + authenticationData->length; header.length += 2 + authorizationName->length; header.length += 2 + authorizationData->length; XdmcpWriteHeader( &buffer, &header ); XdmcpWriteCARD32( &buffer, sessionID ); XdmcpWriteARRAY8( &buffer, authenticationName ); XdmcpWriteARRAY8( &buffer, authenticationData ); XdmcpWriteARRAY8( &buffer, authorizationName ); XdmcpWriteARRAY8( &buffer, authorizationData ); XdmcpFlush( fd, &buffer, (XdmcpNetaddr)to, tolen ); } static void send_decline( struct sockaddr *to, int tolen, ARRAY8Ptr authenticationName, ARRAY8Ptr authenticationData, ARRAY8Ptr status, int fd ) { XdmcpHeader header; Debug( " %.*s\n", status->length, status->data ); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16)DECLINE; header.length = 0; header.length += 2 + status->length; header.length += 2 + authenticationName->length; header.length += 2 + authenticationData->length; XdmcpWriteHeader( &buffer, &header ); XdmcpWriteARRAY8( &buffer, status ); XdmcpWriteARRAY8( &buffer, authenticationName ); XdmcpWriteARRAY8( &buffer, authenticationData ); XdmcpFlush( fd, &buffer, (XdmcpNetaddr)to, tolen ); } static void manage( struct sockaddr *from, int fromlen, int length, int fd ) { CARD32 sessionID; CARD16 displayNumber; ARRAY8 displayClass; int expectlen; struct protoDisplay *pdpy; struct display *d; char *name = NULL; char *class2 = NULL; XdmcpNetaddr from_save; ARRAY8 clientAddress, clientPort; CARD16 connectionType; Debug( " %d\n", length ); displayClass.data = 0; displayClass.length = 0; if (XdmcpReadCARD32( &buffer, &sessionID ) && XdmcpReadCARD16( &buffer, &displayNumber ) && XdmcpReadARRAY8( &buffer, &displayClass )) { expectlen = 4 + /* session ID */ 2 + /* displayNumber */ 2 + displayClass.length; /* displayClass */ if (expectlen != length) { Debug( " length error got %d expect %d\n", length, expectlen ); goto abort; } pdpy = FindProtoDisplay( (XdmcpNetaddr)from, fromlen, displayNumber ); Debug( " session ID %ld, pdpy %p\n", (long)sessionID, pdpy ); if (!pdpy || pdpy->sessionID != sessionID) { /* * We may have already started a session for this display * but it hasn't seen the response in the form of an * XOpenDisplay() yet. So check if it is in the list of active * displays, and if so check that the session id's match. * If all this is true, then we have a duplicate request that * can be ignored. */ if (!pdpy && (d = FindDisplayByAddress( (XdmcpNetaddr)from, fromlen, displayNumber )) && d->sessionID == sessionID) { Debug( "manage: got duplicate pkt, ignoring\n" ); goto abort; } Debug( "session ID %ld refused\n", (long)sessionID ); if (pdpy) Debug( "existing session ID %ld\n", (long)pdpy->sessionID ); send_refuse( from, fromlen, sessionID, fd ); } else { name = NetworkAddressToName( pdpy->connectionType, &pdpy->connectionAddress, from, pdpy->displayNumber ); if (!name) { Debug( "could not compute display name\n" ); send_failed( from, fromlen, "(no name)", sessionID, "out of memory", fd ); goto abort; } Debug( "computed display name: %s\n", name ); if ((d = FindDisplayByName( name ))) { Debug( "terminating active session for %s\n", d->name ); StopDisplay( d ); } if (displayClass.length) { if (!StrNDup( &class2, (char *)displayClass.data, displayClass.length )) { send_failed( from, fromlen, name, sessionID, "out of memory", fd ); goto abort; } } if (!(from_save = (XdmcpNetaddr)Malloc( fromlen ))) { send_failed( from, fromlen, name, sessionID, "out of memory", fd ); goto abort; } memmove( from_save, from, fromlen ); if (!(d = NewDisplay( name ))) { free( (char *)from_save ); send_failed( from, fromlen, name, sessionID, "out of memory", fd ); goto abort; } d->class2 = class2; class2 = 0; d->displayType = dForeign | dTransient | dFromXDMCP; d->sessionID = pdpy->sessionID; d->from.data = (unsigned char *)from_save; d->from.length = fromlen; d->displayNumber = pdpy->displayNumber; ClientAddress( from, &clientAddress, &clientPort, &connectionType ); d->useChooser = 0; d->xdmcpFd = fd; if (IsIndirectClient( &clientAddress, connectionType )) { Debug( "IsIndirectClient\n" ); ForgetIndirectClient( &clientAddress, connectionType ); if (UseChooser( &clientAddress, connectionType )) { d->useChooser = 1; Debug( "use chooser for %s\n", d->name ); } } d->clientAddr = clientAddress; d->connectionType = connectionType; d->remoteHost = NetworkAddressToHostname (pdpy->connectionType, &pdpy->connectionAddress); XdmcpDisposeARRAY8( &clientPort ); if (pdpy->fileAuthorization) { d->authorizations = (Xauth **)Malloc( sizeof(Xauth *) ); if (!d->authorizations) { free( (char *)from_save ); free( (char *)d ); send_failed( from, fromlen, name, sessionID, "out of memory", fd ); goto abort; } d->authorizations[0] = pdpy->fileAuthorization; d->authNum = 1; pdpy->fileAuthorization = 0; } DisposeProtoDisplay( pdpy ); Debug( "starting display %s,%s\n", d->name, d->class2 ); if (LoadDisplayResources( d ) < 0) { LogError( "Unable to read configuration for display %s; " "stopping it.\n", d->name ); StopDisplay( d ); } else StartDisplay( d ); CloseGetter(); } } abort: XdmcpDisposeARRAY8( &displayClass ); if (name) free( (char *)name ); if (class2) free( (char *)class2 ); } void SendFailed( struct display *d, const char *reason ) { Debug( "display start failed, sending \n" ); send_failed( (struct sockaddr *)(d->from.data), d->from.length, d->name, d->sessionID, reason, d->xdmcpFd ); } static void send_failed( struct sockaddr *from, int fromlen, const char *name, CARD32 sessionID, const char *reason, int fd ) { char buf[360]; XdmcpHeader header; ARRAY8 status; sprintf( buf, "Session %ld failed for display %.260s: %s", (long)sessionID, name, reason ); Debug( "send_failed(%\"s)\n", buf ); status.length = strlen( buf ); status.data = (CARD8Ptr) buf; header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16)FAILED; header.length = 6 + status.length; XdmcpWriteHeader( &buffer, &header ); XdmcpWriteCARD32( &buffer, sessionID ); XdmcpWriteARRAY8( &buffer, &status ); XdmcpFlush( fd, &buffer, (XdmcpNetaddr)from, fromlen ); } static void send_refuse( struct sockaddr *from, int fromlen, CARD32 sessionID, int fd ) { XdmcpHeader header; Debug( "send %ld\n", (long)sessionID ); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16)REFUSE; header.length = 4; XdmcpWriteHeader( &buffer, &header ); XdmcpWriteCARD32( &buffer, sessionID ); XdmcpFlush( fd, &buffer, (XdmcpNetaddr)from, fromlen ); } static void send_alive( struct sockaddr *from, int fromlen, int length, int fd ) { CARD32 sessionID; CARD16 displayNumber; struct display *d; XdmcpHeader header; CARD8 sendRunning; CARD32 sendSessionID; Debug( "send \n" ); if (XdmcpReadCARD16( &buffer, &displayNumber ) && XdmcpReadCARD32( &buffer, &sessionID )) { if (length == 6) { if (!(d = FindDisplayBySessionID( sessionID ))) d = FindDisplayByAddress( (XdmcpNetaddr)from, fromlen, displayNumber ); sendRunning = 0; sendSessionID = 0; if (d && d->status == running) { if (d->sessionID == sessionID) sendRunning = 1; sendSessionID = d->sessionID; } header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16)ALIVE; header.length = 5; Debug( ": %d %ld\n", sendRunning, (long)sendSessionID ); XdmcpWriteHeader( &buffer, &header ); XdmcpWriteCARD8( &buffer, sendRunning ); XdmcpWriteCARD32( &buffer, sendSessionID ); XdmcpFlush( fd, &buffer, (XdmcpNetaddr)from, fromlen ); } } } char * NetworkAddressToHostname( CARD16 connectionType, ARRAY8Ptr connectionAddress ) { switch (connectionType) { case FamilyInternet: #if defined(IPv6) && defined(AF_INET6) case FamilyInternet6: #endif { struct hostent *he; char *name, *lname; char *myDot; int af_type; #if defined(IPv6) && defined(AF_INET6) char dotted[INET6_ADDRSTRLEN]; if (connectionType == FamilyInternet6) af_type = AF_INET6; else #endif af_type = AF_INET; he = gethostbyaddr( (char *)connectionAddress->data, connectionAddress->length, af_type ); if (he) { #if defined(IPv6) && defined(AF_INET6) struct addrinfo *ai, *nai; if (!getaddrinfo( he->h_name, NULL, NULL, &ai )) { for (nai = ai; nai; nai = nai->ai_next) { if (af_type == nai->ai_family && !memcmp( nai->ai_family == AF_INET ? (char *)&((struct sockaddr_in *)nai->ai_addr)->sin_addr : (char *)&((struct sockaddr_in6 *)nai->ai_addr)->sin6_addr, connectionAddress->data, connectionAddress->length )) { freeaddrinfo( ai ); goto oki; } } freeaddrinfo( ai ); #else if ((he = gethostbyname( he->h_name )) && he->h_addrtype == AF_INET) { int i; for (i = 0; he->h_addr_list[i]; i++) if (!memcmp( he->h_addr_list[i], connectionAddress->data, 4 )) goto oki; #endif LogError( "DNS spoof attempt or misconfigured resolver.\n" ); } goto gotnone; oki: if (StrDup( &name, he->h_name ) && !strchr( name, '.' ) && (myDot = strchr( localHostname(), '.' ))) { if (ASPrintf( &lname, "%s%s", name, myDot )) { #if defined(IPv6) && defined(AF_INET6) if (!getaddrinfo( lname, NULL, NULL, &ai )) { for (nai = ai; nai; nai = nai->ai_next) { if (af_type == nai->ai_family && !memcmp( nai->ai_family == AF_INET ? (char *)&((struct sockaddr_in *)nai->ai_addr)->sin_addr : (char *)&((struct sockaddr_in6 *)nai->ai_addr)->sin6_addr, connectionAddress->data, connectionAddress->length )) { freeaddrinfo( ai ); free( name ); return lname; } } freeaddrinfo( ai ); } #else if ((he = gethostbyname( lname )) && he->h_addrtype == AF_INET) { int i; for (i = 0; he->h_addr_list[i]; i++) if (!memcmp( he->h_addr_list[i], connectionAddress->data, 4 )) { free( name ); return lname; } } #endif free( lname ); } } } else { gotnone: /* can't get name, so use emergency fallback */ #if defined(IPv6) && defined(AF_INET6) inet_ntop( af_type, connectionAddress->data, dotted, sizeof(dotted) ); StrDup( &name, dotted ); #else ASPrintf( &name, "%[4|'.'hhu", connectionAddress->data ); #endif LogWarn( "Cannot convert Internet address %s to host name\n", name ); } return name; } #ifdef DNET case FamilyDECnet: break; #endif /* DNET */ default: break; } return 0; } #endif /* XDMCP */