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IABSD.fr/xenocara/xserver/os/access.c
matthieu
- xserver/os/access.c
-
/*********************************************************** Copyright 1987, 1998 The Open Group Copyright 2004 Sun Microsystems, Inc. All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, provided that the above copyright notice(s) and this permission notice appear in all copies of the Software and that both the above copyright notice(s) and this permission notice appear in supporting documentation. 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 OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 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 of the copyright holder. X Window System is a trademark of The Open Group. Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Digital not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ #ifdef HAVE_DIX_CONFIG_H #include <dix-config.h> #endif #ifdef WIN32 #include <X11/Xwinsock.h> #endif #include <stdio.h> #include <stdlib.h> #define XSERV_t #define TRANS_SERVER #define TRANS_REOPEN #include <X11/Xtrans/Xtrans.h> #include <X11/Xauth.h> #include <X11/X.h> #include <X11/Xproto.h> #include "misc.h" #include "site.h" #include <errno.h> #include <sys/types.h> #ifndef WIN32 #ifndef Lynx #include <sys/socket.h> #else #include <socket.h> #endif #include <sys/ioctl.h> #include <ctype.h> #if defined(TCPCONN) || defined(STREAMSCONN) || defined(ISC) || defined(__SCO__) #include <netinet/in.h> #endif /* TCPCONN || STREAMSCONN || ISC || __SCO__ */ #ifdef DNETCONN #include <netdnet/dn.h> #include <netdnet/dnetdb.h> #endif #ifdef HAS_GETPEERUCRED # include <ucred.h> # ifdef sun # include <zone.h> # endif #endif #if defined(DGUX) #include <sys/ioctl.h> #include <sys/socket.h> #include <net/if.h> #include <netinet/in.h> #include <ctype.h> #include <sys/utsname.h> #include <sys/stream.h> #include <sys/stropts.h> #include <sys/param.h> #include <sys/sockio.h> #endif #if defined(hpux) || defined(QNX4) # include <sys/utsname.h> # ifdef HAS_IFREQ # include <net/if.h> # endif #else #if defined(SVR4) || (defined(SYSV) && defined(i386)) || defined(__GNU__) # include <sys/utsname.h> #endif #if defined(SYSV) && defined(i386) # include <sys/stream.h> # ifdef ISC # include <sys/stropts.h> # include <sys/sioctl.h> # endif /* ISC */ #endif #ifdef __GNU__ #undef SIOCGIFCONF #include <netdb.h> #else /*!__GNU__*/ # include <net/if.h> #endif /*__GNU__ */ #endif /* hpux */ #ifdef SVR4 #include <sys/sockio.h> #include <sys/stropts.h> #endif #include <netdb.h> #ifdef CSRG_BASED #include <sys/param.h> #if (BSD >= 199103) #define VARIABLE_IFREQ #endif #endif #ifdef BSD44SOCKETS #ifndef VARIABLE_IFREQ #define VARIABLE_IFREQ #endif #endif #ifdef HAS_GETIFADDRS #include <ifaddrs.h> #endif /* Solaris provides an extended interface SIOCGLIFCONF. Other systems * may have this as well, but the code has only been tested on Solaris * so far, so we only enable it there. Other platforms may be added as * needed. * * Test for Solaris commented out -- TSI @ UQV 2003.06.13 */ #ifdef SIOCGLIFCONF /* #if defined(sun) */ #define USE_SIOCGLIFCONF /* #endif */ #endif #endif /* WIN32 */ #ifndef PATH_MAX #ifndef Lynx #include <sys/param.h> #else #include <param.h> #endif #ifndef PATH_MAX #ifdef MAXPATHLEN #define PATH_MAX MAXPATHLEN #else #define PATH_MAX 1024 #endif #endif #endif #ifdef __SCO__ /* The system defined value is wrong. MAXPATHLEN is set in sco5.cf. */ #undef PATH_MAX #endif #define X_INCLUDE_NETDB_H #include <X11/Xos_r.h> #include "dixstruct.h" #include "osdep.h" #include "xace.h" #ifndef PATH_MAX #ifdef MAXPATHLEN #define PATH_MAX MAXPATHLEN #else #define PATH_MAX 1024 #endif #endif Bool defeatAccessControl = FALSE; #define acmp(a1, a2, len) memcmp((char *)(a1), (char *)(a2), len) #define acopy(a1, a2, len) memmove((char *)(a2), (char *)(a1), len) #define addrEqual(fam, address, length, host) \ ((fam) == (host)->family &&\ (length) == (host)->len &&\ !acmp (address, (host)->addr, length)) static int ConvertAddr(struct sockaddr * /*saddr*/, int * /*len*/, pointer * /*addr*/); static int CheckAddr(int /*family*/, pointer /*pAddr*/, unsigned /*length*/); static Bool NewHost(int /*family*/, pointer /*addr*/, int /*len*/, int /* addingLocalHosts */); static int LocalClientCredAndGroups(ClientPtr client, int *pUid, int *pGid, int **pSuppGids, int *nSuppGids); /* XFree86 bug #156: To keep track of which hosts were explicitly requested in /etc/X<display>.hosts, we've added a requested field to the HOST struct, and a LocalHostRequested variable. These default to FALSE, but are set to TRUE in ResetHosts when reading in /etc/X<display>.hosts. They are checked in DisableLocalHost(), which is called to disable the default local host entries when stronger authentication is turned on. */ typedef struct _host { short family; short len; unsigned char *addr; struct _host *next; int requested; } HOST; #define MakeHost(h,l) (h)=(HOST *) xalloc(sizeof *(h)+(l));\ if (h) { \ (h)->addr=(unsigned char *) ((h) + 1);\ (h)->requested = FALSE; \ } #define FreeHost(h) xfree(h) static HOST *selfhosts = NULL; static HOST *validhosts = NULL; static int AccessEnabled = DEFAULT_ACCESS_CONTROL; static int LocalHostEnabled = FALSE; static int LocalHostRequested = FALSE; static int UsingXdmcp = FALSE; /* FamilyServerInterpreted implementation */ static Bool siAddrMatch(int family, pointer addr, int len, HOST *host, ClientPtr client); static int siCheckAddr(const char *addrString, int length); static void siTypesInitialize(void); /* * called when authorization is not enabled to add the * local host to the access list */ void EnableLocalHost (void) { if (!UsingXdmcp) { LocalHostEnabled = TRUE; AddLocalHosts (); } } /* * called when authorization is enabled to keep us secure */ void DisableLocalHost (void) { HOST *self; if (!LocalHostRequested) /* Fix for XFree86 bug #156 */ LocalHostEnabled = FALSE; for (self = selfhosts; self; self = self->next) { if (!self->requested) /* Fix for XFree86 bug #156 */ (void) RemoveHost ((ClientPtr)NULL, self->family, self->len, (pointer)self->addr); } } /* * called at init time when XDMCP will be used; xdmcp always * adds local hosts manually when needed */ void AccessUsingXdmcp (void) { UsingXdmcp = TRUE; LocalHostEnabled = FALSE; } #if ((defined(SVR4) && !defined(DGUX) && !defined(SCO325) && !defined(sun) && !defined(NCR)) || defined(ISC)) && !defined(__sgi) && defined(SIOCGIFCONF) && !defined(USE_SIOCGLIFCONF) /* Deal with different SIOCGIFCONF ioctl semantics on these OSs */ static int ifioctl (int fd, int cmd, char *arg) { struct strioctl ioc; int ret; bzero((char *) &ioc, sizeof(ioc)); ioc.ic_cmd = cmd; ioc.ic_timout = 0; if (cmd == SIOCGIFCONF) { ioc.ic_len = ((struct ifconf *) arg)->ifc_len; ioc.ic_dp = ((struct ifconf *) arg)->ifc_buf; #ifdef ISC /* SIOCGIFCONF is somewhat brain damaged on ISC. The argument * buffer must contain the ifconf structure as header. Ifc_req * is also not a pointer but a one element array of ifreq * structures. On return this array is extended by enough * ifreq fields to hold all interfaces. The return buffer length * is placed in the buffer header. */ ((struct ifconf *) ioc.ic_dp)->ifc_len = ioc.ic_len - sizeof(struct ifconf); #endif } else { ioc.ic_len = sizeof(struct ifreq); ioc.ic_dp = arg; } ret = ioctl(fd, I_STR, (char *) &ioc); if (ret >= 0 && cmd == SIOCGIFCONF) #ifdef SVR4 ((struct ifconf *) arg)->ifc_len = ioc.ic_len; #endif #ifdef ISC { ((struct ifconf *) arg)->ifc_len = ((struct ifconf *)ioc.ic_dp)->ifc_len; ((struct ifconf *) arg)->ifc_buf = (caddr_t)((struct ifconf *)ioc.ic_dp)->ifc_req; } #endif return(ret); } #else /* Case DGUX, sun, SCO325 NCR and others */ #define ifioctl ioctl #endif /* ((SVR4 && !DGUX !sun !SCO325 !NCR) || ISC) && SIOCGIFCONF */ /* * DefineSelf (fd): * * Define this host for access control. Find all the hosts the OS knows about * for this fd and add them to the selfhosts list. */ #ifdef WINTCP /* NCR Wollongong based TCP */ #include <sys/un.h> #include <stropts.h> #include <tiuser.h> #include <sys/stream.h> #include <net/if.h> #include <netinet/ip.h> #include <netinet/ip_var.h> #include <netinet/in.h> #include <netinet/in_var.h> void DefineSelf (int fd) { /* * The Wolongong drivers used by NCR SVR4/MP-RAS don't understand the * socket IO calls that most other drivers seem to like. Because of * this, this routine must be special cased for NCR. Eventually, * this will be cleared up. */ struct ipb ifnet; struct in_ifaddr ifaddr; struct strioctl str; unsigned char *addr; register HOST *host; int family, len; if ((fd = open ("/dev/ip", O_RDWR, 0 )) < 0) Error ("Getting interface configuration (1)"); /* Indicate that we want to start at the begining */ ifnet.ib_next = (struct ipb *) 1; while (ifnet.ib_next) { str.ic_cmd = IPIOC_GETIPB; str.ic_timout = 0; str.ic_len = sizeof (struct ipb); str.ic_dp = (char *) &ifnet; if (ioctl (fd, (int) I_STR, (char *) &str) < 0) { close (fd); Error ("Getting interface configuration (2)"); } ifaddr.ia_next = (struct in_ifaddr *) ifnet.if_addrlist; str.ic_cmd = IPIOC_GETINADDR; str.ic_timout = 0; str.ic_len = sizeof (struct in_ifaddr); str.ic_dp = (char *) &ifaddr; if (ioctl (fd, (int) I_STR, (char *) &str) < 0) { close (fd); Error ("Getting interface configuration (3)"); } len = sizeof(struct sockaddr_in); family = ConvertAddr (IA_SIN(&ifaddr), &len, (pointer *)&addr); if (family == -1 || family == FamilyLocal) continue; for (host = selfhosts; host && !addrEqual (family, addr, len, host); host = host->next) ; if (host) continue; MakeHost(host,len) if (host) { host->family = family; host->len = len; acopy(addr, host->addr, len); host->next = selfhosts; selfhosts = host; } #ifdef XDMCP { struct sockaddr broad_addr; /* * If this isn't an Internet Address, don't register it. */ if (family != FamilyInternet) continue; /* * Ignore 'localhost' entries as they're not useful * on the other end of the wire. */ if (len == 4 && addr[0] == 127 && addr[1] == 0 && addr[2] == 0 && addr[3] == 1) continue; /* * Ignore '0.0.0.0' entries as they are * returned by some OSes for unconfigured NICs but they are * not useful on the other end of the wire. */ if (len == 4 && addr[0] == 0 && addr[1] == 0 && addr[2] == 0 && addr[3] == 0) continue; XdmcpRegisterConnection (family, (char *)addr, len); #define IA_BROADADDR(ia) ((struct sockaddr_in *)(&((struct in_ifaddr *)ia)->ia_broadaddr)) XdmcpRegisterBroadcastAddress ( (struct sockaddr_in *) IA_BROADADDR(&ifaddr)); #undef IA_BROADADDR } #endif /* XDMCP */ } close(fd); /* * add something of FamilyLocalHost */ for (host = selfhosts; host && !addrEqual(FamilyLocalHost, "", 0, host); host = host->next); if (!host) { MakeHost(host, 0); if (host) { host->family = FamilyLocalHost; host->len = 0; acopy("", host->addr, 0); host->next = selfhosts; selfhosts = host; } } } #else /* WINTCP */ #if !defined(SIOCGIFCONF) || (defined (hpux) && ! defined (HAS_IFREQ)) || defined(QNX4) void DefineSelf (int fd) { #if !defined(TCPCONN) && !defined(STREAMSCONN) && !defined(UNIXCONN) && !defined(MNX_TCPCONN) return; #else register int n; int len; caddr_t addr; int family; register HOST *host; #ifndef WIN32 struct utsname name; #else struct { char nodename[512]; } name; #endif register struct hostent *hp; union { struct sockaddr sa; struct sockaddr_in in; #if defined(IPv6) && defined(AF_INET6) struct sockaddr_in6 in6; #endif } saddr; struct sockaddr_in *inetaddr; struct sockaddr_in6 *inet6addr; struct sockaddr_in broad_addr; #ifdef XTHREADS_NEEDS_BYNAMEPARAMS _Xgethostbynameparams hparams; #endif /* Why not use gethostname()? Well, at least on my system, I've had to * make an ugly kernel patch to get a name longer than 8 characters, and * uname() lets me access to the whole string (it smashes release, you * see), whereas gethostname() kindly truncates it for me. */ #ifndef QNX4 #ifndef WIN32 uname(&name); #else gethostname(name.nodename, sizeof(name.nodename)); #endif #else /* QNX4's uname returns node number in name.nodename, not the hostname have to overwrite it */ char hname[1024]; gethostname(hname, 1024); name.nodename = hname; #endif hp = _XGethostbyname(name.nodename, hparams); if (hp != NULL) { saddr.sa.sa_family = hp->h_addrtype; switch (hp->h_addrtype) { case AF_INET: inetaddr = (struct sockaddr_in *) (&(saddr.sa)); acopy ( hp->h_addr, &(inetaddr->sin_addr), hp->h_length); len = sizeof(saddr.sa); break; #if defined(IPv6) && defined(AF_INET6) case AF_INET6: inet6addr = (struct sockaddr_in6 *) (&(saddr.sa)); acopy ( hp->h_addr, &(inet6addr->sin6_addr), hp->h_length); len = sizeof(saddr.in6); break; #endif default: goto DefineLocalHost; } family = ConvertAddr ( &(saddr.sa), &len, (pointer *)&addr); if ( family != -1 && family != FamilyLocal ) { for (host = selfhosts; host && !addrEqual (family, addr, len, host); host = host->next) ; if (!host) { /* add this host to the host list. */ MakeHost(host,len) if (host) { host->family = family; host->len = len; acopy ( addr, host->addr, len); host->next = selfhosts; selfhosts = host; } #ifdef XDMCP /* * If this is an Internet Address, but not the localhost * address (127.0.0.1), nor the bogus address (0.0.0.0), * register it. */ if (family == FamilyInternet && !(len == 4 && ((addr[0] == 127 && addr[1] == 0 && addr[2] == 0 && addr[3] == 1) || (addr[0] == 0 && addr[1] == 0 && addr[2] == 0 && addr[3] == 0))) ) { XdmcpRegisterConnection (family, (char *)addr, len); broad_addr = *inetaddr; ((struct sockaddr_in *) &broad_addr)->sin_addr.s_addr = htonl (INADDR_BROADCAST); XdmcpRegisterBroadcastAddress ((struct sockaddr_in *) &broad_addr); } #if defined(IPv6) && defined(AF_INET6) else if (family == FamilyInternet6 && !(IN6_IS_ADDR_LOOPBACK((struct in6_addr *)addr))) { XdmcpRegisterConnection (family, (char *)addr, len); } #endif #endif /* XDMCP */ } } } /* * now add a host of family FamilyLocalHost... */ DefineLocalHost: for (host = selfhosts; host && !addrEqual(FamilyLocalHost, "", 0, host); host = host->next); if (!host) { MakeHost(host, 0); if (host) { host->family = FamilyLocalHost; host->len = 0; acopy("", host->addr, 0); host->next = selfhosts; selfhosts = host; } } #endif /* !TCPCONN && !STREAMSCONN && !UNIXCONN && !MNX_TCPCONN */ } #else #ifdef USE_SIOCGLIFCONF #define ifr_type struct lifreq #else #define ifr_type struct ifreq #endif #ifdef VARIABLE_IFREQ #define ifr_size(p) (sizeof (struct ifreq) + \ (p->ifr_addr.sa_len > sizeof (p->ifr_addr) ? \ p->ifr_addr.sa_len - sizeof (p->ifr_addr) : 0)) #define ifraddr_size(a) (a.sa_len) #else #ifdef QNX4 #define ifr_size(p) (p->ifr_addr.sa_len + IFNAMSIZ) #define ifraddr_size(a) (a.sa_len) #else #define ifr_size(p) (sizeof (ifr_type)) #define ifraddr_size(a) (sizeof (a)) #endif #endif #if defined(DEF_SELF_DEBUG) || (defined(IPv6) && defined(AF_INET6)) #include <arpa/inet.h> #endif #if defined(IPv6) && defined(AF_INET6) static void in6_fillscopeid(struct sockaddr_in6 *sin6) { #if defined(__KAME__) if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { sin6->sin6_scope_id = ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]); sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0; } #endif } #endif void DefineSelf (int fd) { #ifndef HAS_GETIFADDRS char buf[2048], *cp, *cplim; void * bufptr = buf; #ifdef USE_SIOCGLIFCONF struct lifconf ifc; register struct lifreq *ifr; #ifdef SIOCGLIFNUM struct lifnum ifn; #endif #else struct ifconf ifc; register struct ifreq *ifr; #endif #else struct ifaddrs * ifap, *ifr; #endif int len; unsigned char * addr; int family; register HOST *host; #ifdef DNETCONN struct dn_naddr *dnaddr = getnodeadd(); /* * AF_DECnet may not be listed in the interface list. Instead use * the supported library call to find out the local address (if any). */ if (dnaddr) { addr = (unsigned char *) dnaddr; len = dnaddr->a_len + sizeof(dnaddr->a_len); family = FamilyDECnet; for (host = selfhosts; host && !addrEqual (family, addr, len, host); host = host->next) ; if (!host) { MakeHost(host,len) if (host) { host->family = family; host->len = len; acopy(addr, host->addr, len); host->next = selfhosts; selfhosts = host; } } } #endif /* DNETCONN */ #ifndef HAS_GETIFADDRS len = sizeof(buf); #ifdef USE_SIOCGLIFCONF #ifdef SIOCGLIFNUM ifn.lifn_family = AF_UNSPEC; ifn.lifn_flags = 0; if (ioctl (fd, SIOCGLIFNUM, (char *) &ifn) < 0) Error ("Getting interface count"); if (len < (ifn.lifn_count * sizeof(struct lifreq))) { len = ifn.lifn_count * sizeof(struct lifreq); bufptr = xalloc(len); } #endif ifc.lifc_family = AF_UNSPEC; ifc.lifc_flags = 0; ifc.lifc_len = len; ifc.lifc_buf = bufptr; #define IFC_IOCTL_REQ SIOCGLIFCONF #define IFC_IFC_REQ ifc.lifc_req #define IFC_IFC_LEN ifc.lifc_len #define IFR_IFR_ADDR ifr->lifr_addr #define IFR_IFR_NAME ifr->lifr_name #else /* Use SIOCGIFCONF */ ifc.ifc_len = len; ifc.ifc_buf = bufptr; #define IFC_IOCTL_REQ SIOCGIFCONF #ifdef ISC #define IFC_IFC_REQ (struct ifreq *) ifc.ifc_buf #else #define IFC_IFC_REQ ifc.ifc_req #endif /* ISC */ #define IFC_IFC_LEN ifc.ifc_len #define IFR_IFR_ADDR ifr->ifr_addr #define IFR_IFR_NAME ifr->ifr_name #endif if (ifioctl (fd, IFC_IOCTL_REQ, (pointer) &ifc) < 0) Error ("Getting interface configuration (4)"); cplim = (char *) IFC_IFC_REQ + IFC_IFC_LEN; for (cp = (char *) IFC_IFC_REQ; cp < cplim; cp += ifr_size (ifr)) { ifr = (ifr_type *) cp; len = ifraddr_size (IFR_IFR_ADDR); family = ConvertAddr ((struct sockaddr *) &IFR_IFR_ADDR, &len, (pointer *)&addr); #ifdef DNETCONN /* * DECnet was handled up above. */ if (family == AF_DECnet) continue; #endif /* DNETCONN */ if (family == -1 || family == FamilyLocal) continue; #if defined(IPv6) && defined(AF_INET6) if (family == FamilyInternet6) in6_fillscopeid((struct sockaddr_in6 *)&IFR_IFR_ADDR); #endif #ifdef DEF_SELF_DEBUG if (family == FamilyInternet) ErrorF("Xserver: DefineSelf(): ifname = %s, addr = %d.%d.%d.%d\n", IFR_IFR_NAME, addr[0], addr[1], addr[2], addr[3]); #if defined(IPv6) && defined(AF_INET6) else if (family == FamilyInternet6) { char cp[INET6_ADDRSTRLEN] = ""; inet_ntop(AF_INET6, addr, cp, sizeof(cp)); ErrorF("Xserver: DefineSelf(): ifname = %s, addr = %s\n", IFR_IFR_NAME, cp); } #endif #endif /* DEF_SELF_DEBUG */ for (host = selfhosts; host && !addrEqual (family, addr, len, host); host = host->next) ; if (host) continue; MakeHost(host,len) if (host) { host->family = family; host->len = len; acopy(addr, host->addr, len); host->next = selfhosts; selfhosts = host; } #ifdef XDMCP { #ifdef USE_SIOCGLIFCONF struct sockaddr_storage broad_addr; #else struct sockaddr broad_addr; #endif /* * If this isn't an Internet Address, don't register it. */ if (family != FamilyInternet #if defined(IPv6) && defined(AF_INET6) && family != FamilyInternet6 #endif ) continue; /* * ignore 'localhost' entries as they're not useful * on the other end of the wire */ if (family == FamilyInternet && addr[0] == 127 && addr[1] == 0 && addr[2] == 0 && addr[3] == 1) continue; #if defined(IPv6) && defined(AF_INET6) else if (family == FamilyInternet6 && IN6_IS_ADDR_LOOPBACK((struct in6_addr *)addr)) continue; #endif /* * Ignore '0.0.0.0' entries as they are * returned by some OSes for unconfigured NICs but they are * not useful on the other end of the wire. */ if (len == 4 && addr[0] == 0 && addr[1] == 0 && addr[2] == 0 && addr[3] == 0) continue; XdmcpRegisterConnection (family, (char *)addr, len); #if defined(IPv6) && defined(AF_INET6) /* IPv6 doesn't support broadcasting, so we drop out here */ if (family == FamilyInternet6) continue; #endif broad_addr = IFR_IFR_ADDR; ((struct sockaddr_in *) &broad_addr)->sin_addr.s_addr = htonl (INADDR_BROADCAST); #if defined(USE_SIOCGLIFCONF) && defined(SIOCGLIFBRDADDR) { struct lifreq broad_req; broad_req = *ifr; if (ioctl (fd, SIOCGLIFFLAGS, (char *) &broad_req) != -1 && (broad_req.lifr_flags & IFF_BROADCAST) && (broad_req.lifr_flags & IFF_UP) ) { broad_req = *ifr; if (ioctl (fd, SIOCGLIFBRDADDR, &broad_req) != -1) broad_addr = broad_req.lifr_broadaddr; else continue; } else continue; } #elif defined(SIOCGIFBRDADDR) { struct ifreq broad_req; broad_req = *ifr; if (ifioctl (fd, SIOCGIFFLAGS, (pointer) &broad_req) != -1 && (broad_req.ifr_flags & IFF_BROADCAST) && (broad_req.ifr_flags & IFF_UP) ) { broad_req = *ifr; if (ifioctl (fd, SIOCGIFBRDADDR, (pointer) &broad_req) != -1) broad_addr = broad_req.ifr_addr; else continue; } else continue; } #endif /* SIOCGIFBRDADDR */ #ifdef DEF_SELF_DEBUG ErrorF("Xserver: DefineSelf(): ifname = %s, baddr = %s\n", IFR_IFR_NAME, inet_ntoa(((struct sockaddr_in *) &broad_addr)->sin_addr)); #endif /* DEF_SELF_DEBUG */ XdmcpRegisterBroadcastAddress ((struct sockaddr_in *) &broad_addr); } #endif /* XDMCP */ } if (bufptr != buf) free(bufptr); #else /* HAS_GETIFADDRS */ if (getifaddrs(&ifap) < 0) { ErrorF("Warning: getifaddrs returns %s\n", strerror(errno)); return; } for (ifr = ifap; ifr != NULL; ifr = ifr->ifa_next) { if (!ifr->ifa_addr) continue; #ifdef DNETCONN if (ifr->ifa_addr.sa_family == AF_DECnet) continue; #endif /* DNETCONN */ len = sizeof(*(ifr->ifa_addr)); family = ConvertAddr(ifr->ifa_addr, &len, (pointer *)&addr); if (family == -1 || family == FamilyLocal) continue; #if defined(IPv6) && defined(AF_INET6) if (family == FamilyInternet6) in6_fillscopeid((struct sockaddr_in6 *)ifr->ifa_addr); #endif #ifdef DEF_SELF_DEBUG if (family == FamilyInternet) ErrorF("Xserver: DefineSelf(): ifname = %s, addr = %d.%d.%d.%d\n", ifr->ifa_name, addr[0], addr[1], addr[2], addr[3]); #if defined(IPv6) && defined(AF_INET6) else if (family == FamilyInternet6) { char cp[INET6_ADDRSTRLEN]; inet_ntop(AF_INET6, addr, cp, sizeof(cp)); ErrorF("Xserver: DefineSelf(): ifname = %s addr = %s\n", ifr->ifa_name, cp); } #endif #endif /* DEF_SELF_DEBUG */ for (host = selfhosts; host != NULL && !addrEqual(family, addr, len, host); host = host->next) ; if (host != NULL) continue; MakeHost(host, len); if (host != NULL) { host->family = family; host->len = len; acopy(addr, host->addr, len); host->next = selfhosts; selfhosts = host; } #ifdef XDMCP { struct sockaddr broad_addr; /* * If this isn't an Internet Address, don't register it. */ if (family != FamilyInternet #if defined(IPv6) && defined(AF_INET6) && family != FamilyInternet6 #endif ) continue; /* * ignore 'localhost' entries as they're not useful * on the other end of the wire */ if (ifr->ifa_flags & IFF_LOOPBACK) continue; if (family == FamilyInternet && addr[0] == 127 && addr[1] == 0 && addr[2] == 0 && addr[3] == 1) continue; /* * Ignore '0.0.0.0' entries as they are * returned by some OSes for unconfigured NICs but they are * not useful on the other end of the wire. */ if (len == 4 && addr[0] == 0 && addr[1] == 0 && addr[2] == 0 && addr[3] == 0) continue; #if defined(IPv6) && defined(AF_INET6) else if (family == FamilyInternet6 && IN6_IS_ADDR_LOOPBACK((struct in6_addr *)addr)) continue; #endif XdmcpRegisterConnection(family, (char *)addr, len); #if defined(IPv6) && defined(AF_INET6) if (family == FamilyInternet6) /* IPv6 doesn't support broadcasting, so we drop out here */ continue; #endif if ((ifr->ifa_flags & IFF_BROADCAST) && (ifr->ifa_flags & IFF_UP)) broad_addr = *ifr->ifa_broadaddr; else continue; #ifdef DEF_SELF_DEBUG ErrorF("Xserver: DefineSelf(): ifname = %s, baddr = %s\n", ifr->ifa_name, inet_ntoa(((struct sockaddr_in *) &broad_addr)->sin_addr)); #endif /* DEF_SELF_DEBUG */ XdmcpRegisterBroadcastAddress((struct sockaddr_in *) &broad_addr); } #endif /* XDMCP */ } /* for */ freeifaddrs(ifap); #endif /* HAS_GETIFADDRS */ /* * add something of FamilyLocalHost */ for (host = selfhosts; host && !addrEqual(FamilyLocalHost, "", 0, host); host = host->next); if (!host) { MakeHost(host, 0); if (host) { host->family = FamilyLocalHost; host->len = 0; acopy("", host->addr, 0); host->next = selfhosts; selfhosts = host; } } } #endif /* hpux && !HAS_IFREQ */ #endif /* WINTCP */ #ifdef XDMCP void AugmentSelf(pointer from, int len) { int family; pointer addr; register HOST *host; family = ConvertAddr(from, &len, (pointer *)&addr); if (family == -1 || family == FamilyLocal) return; for (host = selfhosts; host; host = host->next) { if (addrEqual(family, addr, len, host)) return; } MakeHost(host,len) if (!host) return; host->family = family; host->len = len; acopy(addr, host->addr, len); host->next = selfhosts; selfhosts = host; } #endif void AddLocalHosts (void) { HOST *self; for (self = selfhosts; self; self = self->next) /* Fix for XFree86 bug #156: pass addingLocal = TRUE to * NewHost to tell that we are adding the default local * host entries and not to flag the entries as being * explicitely requested */ (void) NewHost (self->family, self->addr, self->len, TRUE); } /* Reset access control list to initial hosts */ void ResetHosts (char *display) { register HOST *host; char lhostname[120], ohostname[120]; char *hostname = ohostname; char fname[PATH_MAX + 1]; int fnamelen; FILE *fd; char *ptr; int i, hostlen; #if ((defined(TCPCONN) || defined(STREAMSCONN) || defined(MNX_TCPCONN)) && \ (!defined(IPv6) || !defined(AF_INET6))) || defined(DNETCONN) union { struct sockaddr sa; #if defined(TCPCONN) || defined(STREAMSCONN) || defined(MNX_TCPCONN) struct sockaddr_in in; #endif /* TCPCONN || STREAMSCONN */ #ifdef DNETCONN struct sockaddr_dn dn; #endif } saddr; #endif #ifdef DNETCONN struct nodeent *np; struct dn_naddr dnaddr, *dnaddrp, *dnet_addr(); #endif int family = 0; pointer addr; int len; siTypesInitialize(); AccessEnabled = defeatAccessControl ? FALSE : DEFAULT_ACCESS_CONTROL; LocalHostEnabled = FALSE; while ((host = validhosts) != 0) { validhosts = host->next; FreeHost (host); } #if defined WIN32 && defined __MINGW32__ #define ETC_HOST_PREFIX "X" #else #define ETC_HOST_PREFIX "/etc/X" #endif #define ETC_HOST_SUFFIX ".hosts" fnamelen = strlen(ETC_HOST_PREFIX) + strlen(ETC_HOST_SUFFIX) + strlen(display) + 1; if (fnamelen > sizeof(fname)) FatalError("Display name `%s' is too long\n", display); snprintf(fname, sizeof(fname), ETC_HOST_PREFIX "%s" ETC_HOST_SUFFIX, display); if ((fd = fopen (fname, "r")) != 0) { while (fgets (ohostname, sizeof (ohostname), fd)) { family = FamilyWild; if (*ohostname == '#') continue; if ((ptr = strchr(ohostname, '\n')) != 0) *ptr = 0; hostlen = strlen(ohostname) + 1; for (i = 0; i < hostlen; i++) lhostname[i] = tolower(ohostname[i]); hostname = ohostname; if (!strncmp("local:", lhostname, 6)) { family = FamilyLocalHost; NewHost(family, "", 0, FALSE); LocalHostRequested = TRUE; /* Fix for XFree86 bug #156 */ } #if defined(TCPCONN) || defined(STREAMSCONN) || defined(MNX_TCPCONN) else if (!strncmp("inet:", lhostname, 5)) { family = FamilyInternet; hostname = ohostname + 5; } #if defined(IPv6) && defined(AF_INET6) else if (!strncmp("inet6:", lhostname, 6)) { family = FamilyInternet6; hostname = ohostname + 6; } #endif #endif #ifdef DNETCONN else if (!strncmp("dnet:", lhostname, 5)) { family = FamilyDECnet; hostname = ohostname + 5; } #endif #ifdef SECURE_RPC else if (!strncmp("nis:", lhostname, 4)) { family = FamilyNetname; hostname = ohostname + 4; } #endif else if (!strncmp("si:", lhostname, 3)) { family = FamilyServerInterpreted; hostname = ohostname + 3; hostlen -= 3; } if (family == FamilyServerInterpreted) { len = siCheckAddr(hostname, hostlen); if (len >= 0) { NewHost(family, hostname, len, FALSE); } } else #ifdef DNETCONN if ((family == FamilyDECnet) || ((family == FamilyWild) && (ptr = strchr(hostname, ':')) && (*(ptr + 1) == ':') && !(*ptr = '\0'))) /* bash trailing colons if necessary */ { /* node name (DECnet names end in "::") */ dnaddrp = dnet_addr(hostname); if (!dnaddrp && (np = getnodebyname (hostname))) { /* node was specified by name */ saddr.sa.sa_family = np->n_addrtype; len = sizeof(saddr.sa); if (ConvertAddr (&saddr.sa, &len, (pointer *)&addr) == FamilyDECnet) { bzero ((char *) &dnaddr, sizeof (dnaddr)); dnaddr.a_len = np->n_length; acopy (np->n_addr, dnaddr.a_addr, np->n_length); dnaddrp = &dnaddr; } } if (dnaddrp) (void) NewHost(FamilyDECnet, (pointer)dnaddrp, (int)(dnaddrp->a_len + sizeof(dnaddrp->a_len)), FALSE); } else #endif /* DNETCONN */ #ifdef SECURE_RPC if ((family == FamilyNetname) || (strchr(hostname, '@'))) { SecureRPCInit (); (void) NewHost (FamilyNetname, hostname, strlen (hostname), FALSE); } else #endif /* SECURE_RPC */ #if defined(TCPCONN) || defined(STREAMSCONN) || defined(MNX_TCPCONN) { #if defined(IPv6) && defined(AF_INET6) if ( (family == FamilyInternet) || (family == FamilyInternet6) || (family == FamilyWild) ) { struct addrinfo *addresses; struct addrinfo *a; int f; if (getaddrinfo(hostname, NULL, NULL, &addresses) == 0) { for (a = addresses ; a != NULL ; a = a->ai_next) { len = a->ai_addrlen; f = ConvertAddr(a->ai_addr,&len,(pointer *)&addr); if ( (family == f) || ((family == FamilyWild) && (f != -1)) ) { NewHost(f, addr, len, FALSE); } } freeaddrinfo(addresses); } } #else #ifdef XTHREADS_NEEDS_BYNAMEPARAMS _Xgethostbynameparams hparams; #endif register struct hostent *hp; /* host name */ if ((family == FamilyInternet && ((hp = _XGethostbyname(hostname, hparams)) != 0)) || ((hp = _XGethostbyname(hostname, hparams)) != 0)) { saddr.sa.sa_family = hp->h_addrtype; len = sizeof(saddr.sa); if ((family = ConvertAddr (&saddr.sa, &len, (pointer *)&addr)) != -1) { #ifdef h_addr /* new 4.3bsd version of gethostent */ char **list; /* iterate over the addresses */ for (list = hp->h_addr_list; *list; list++) (void) NewHost (family, (pointer)*list, len, FALSE); #else (void) NewHost (family, (pointer)hp->h_addr, len, FALSE); #endif } } #endif /* IPv6 */ } #endif /* TCPCONN || STREAMSCONN */ family = FamilyWild; } fclose (fd); } } /* Is client on the local host */ _X_EXPORT Bool LocalClient(ClientPtr client) { int alen, family, notused; Xtransaddr *from = NULL; pointer addr; register HOST *host; if (!_XSERVTransGetPeerAddr (((OsCommPtr)client->osPrivate)->trans_conn, ¬used, &alen, &from)) { family = ConvertAddr ((struct sockaddr *) from, &alen, (pointer *)&addr); if (family == -1) { xfree ((char *) from); return FALSE; } if (family == FamilyLocal) { xfree ((char *) from); return TRUE; } for (host = selfhosts; host; host = host->next) { if (addrEqual (family, addr, alen, host)) return TRUE; } xfree ((char *) from); } return FALSE; } /* * Return the uid and gid of a connected local client * or the uid/gid for nobody those ids cannot be determined * * Used by XShm to test access rights to shared memory segments */ int LocalClientCred(ClientPtr client, int *pUid, int *pGid) { return LocalClientCredAndGroups(client, pUid, pGid, NULL, NULL); } /* * Return the uid and all gids of a connected local client * or the uid/gid for nobody those ids cannot be determined * * If the caller passes non-NULL values for pSuppGids & nSuppGids, * they are responsible for calling XFree(*pSuppGids) to release the * memory allocated for the supplemental group ids list. * * Used by localuser & localgroup ServerInterpreted access control forms below */ static int LocalClientCredAndGroups(ClientPtr client, int *pUid, int *pGid, int **pSuppGids, int *nSuppGids) { #if defined(HAS_GETPEEREID) || defined(HAS_GETPEERUCRED) || defined(SO_PEERCRED) int fd; XtransConnInfo ci; #ifdef HAS_GETPEEREID uid_t uid; gid_t gid; #elif defined(HAS_GETPEERUCRED) ucred_t *peercred = NULL; #elif defined(SO_PEERCRED) struct ucred peercred; socklen_t so_len = sizeof(peercred); #endif if (client == NULL) return -1; ci = ((OsCommPtr)client->osPrivate)->trans_conn; #if !(defined(sun) && defined(HAS_GETPEERUCRED)) /* Most implementations can only determine peer credentials for Unix * domain sockets - Solaris getpeerucred can work with a bit more, so * we just let it tell us if the connection type is supported or not */ if (!_XSERVTransIsLocal(ci)) { return -1; } #endif if (pSuppGids != NULL) *pSuppGids = NULL; if (nSuppGids != NULL) *nSuppGids = 0; fd = _XSERVTransGetConnectionNumber(ci); #ifdef HAS_GETPEEREID if (getpeereid(fd, &uid, &gid) == -1) return -1; if (pUid != NULL) *pUid = uid; if (pGid != NULL) *pGid = gid; return 0; #elif defined(HAS_GETPEERUCRED) if (getpeerucred(fd, &peercred) < 0) return -1; #ifdef sun /* Ensure process is in the same zone */ if (getzoneid() != ucred_getzoneid(peercred)) { ucred_free(peercred); return -1; } #endif if (pUid != NULL) *pUid = ucred_geteuid(peercred); if (pGid != NULL) *pGid = ucred_getegid(peercred); if (pSuppGids != NULL && nSuppGids != NULL) { const gid_t *gids; *nSuppGids = ucred_getgroups(peercred, &gids); if (*nSuppGids > 0) { *pSuppGids = xalloc(sizeof(int) * (*nSuppGids)); if (*pSuppGids == NULL) { *nSuppGids = 0; } else { int i; for (i = 0 ; i < *nSuppGids; i++) { (*pSuppGids)[i] = (int) gids[i]; } } } } ucred_free(peercred); return 0; #elif defined(SO_PEERCRED) if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &peercred, &so_len) == -1) return -1; if (pUid != NULL) *pUid = peercred.uid; if (pGid != NULL) *pGid = peercred.gid; return 0; #endif #else /* No system call available to get the credentials of the peer */ #define NO_LOCAL_CLIENT_CRED return -1; #endif } static Bool AuthorizedClient(ClientPtr client) { if (!client || defeatAccessControl) return TRUE; /* untrusted clients can't change host access */ if (!XaceHook(XACE_HOSTLIST_ACCESS, client, DixWriteAccess)) return FALSE; return LocalClient(client); } /* Add a host to the access control list. This is the external interface * called from the dispatcher */ int AddHost (ClientPtr client, int family, unsigned length, /* of bytes in pAddr */ pointer pAddr) { int len; if (!AuthorizedClient(client)) return(BadAccess); switch (family) { case FamilyLocalHost: len = length; LocalHostEnabled = TRUE; break; #ifdef SECURE_RPC case FamilyNetname: len = length; SecureRPCInit (); break; #endif case FamilyInternet: #if defined(IPv6) && defined(AF_INET6) case FamilyInternet6: #endif case FamilyDECnet: case FamilyChaos: case FamilyServerInterpreted: if ((len = CheckAddr (family, pAddr, length)) < 0) { client->errorValue = length; return (BadValue); } break; case FamilyLocal: default: client->errorValue = family; return (BadValue); } if (NewHost (family, pAddr, len, FALSE)) return Success; return BadAlloc; } Bool ForEachHostInFamily (int family, Bool (*func)( unsigned char * /* addr */, short /* len */, pointer /* closure */), pointer closure) { HOST *host; for (host = validhosts; host; host = host->next) if (family == host->family && func (host->addr, host->len, closure)) return TRUE; return FALSE; } /* Add a host to the access control list. This is the internal interface * called when starting or resetting the server */ static Bool NewHost (int family, pointer addr, int len, int addingLocalHosts) { register HOST *host; for (host = validhosts; host; host = host->next) { if (addrEqual (family, addr, len, host)) return TRUE; } if (!addingLocalHosts) { /* Fix for XFree86 bug #156 */ for (host = selfhosts; host; host = host->next) { if (addrEqual (family, addr, len, host)) { host->requested = TRUE; break; } } } MakeHost(host,len) if (!host) return FALSE; host->family = family; host->len = len; acopy(addr, host->addr, len); host->next = validhosts; validhosts = host; return TRUE; } /* Remove a host from the access control list */ int RemoveHost ( ClientPtr client, int family, unsigned length, /* of bytes in pAddr */ pointer pAddr) { int len; register HOST *host, **prev; if (!AuthorizedClient(client)) return(BadAccess); switch (family) { case FamilyLocalHost: len = length; LocalHostEnabled = FALSE; break; #ifdef SECURE_RPC case FamilyNetname: len = length; break; #endif case FamilyInternet: #if defined(IPv6) && defined(AF_INET6) case FamilyInternet6: #endif case FamilyDECnet: case FamilyChaos: case FamilyServerInterpreted: if ((len = CheckAddr (family, pAddr, length)) < 0) { client->errorValue = length; return(BadValue); } break; case FamilyLocal: default: client->errorValue = family; return(BadValue); } for (prev = &validhosts; (host = *prev) && (!addrEqual (family, pAddr, len, host)); prev = &host->next) ; if (host) { *prev = host->next; FreeHost (host); } return (Success); } /* Get all hosts in the access control list */ int GetHosts ( pointer *data, int *pnHosts, int *pLen, BOOL *pEnabled) { int len; register int n = 0; register unsigned char *ptr; register HOST *host; int nHosts = 0; *pEnabled = AccessEnabled ? EnableAccess : DisableAccess; for (host = validhosts; host; host = host->next) { nHosts++; n += (((host->len + 3) >> 2) << 2) + sizeof(xHostEntry); } if (n) { *data = ptr = (pointer) xalloc (n); if (!ptr) { return(BadAlloc); } for (host = validhosts; host; host = host->next) { len = host->len; ((xHostEntry *)ptr)->family = host->family; ((xHostEntry *)ptr)->length = len; ptr += sizeof(xHostEntry); acopy (host->addr, ptr, len); ptr += ((len + 3) >> 2) << 2; } } else { *data = NULL; } *pnHosts = nHosts; *pLen = n; return(Success); } /* Check for valid address family and length, and return address length. */ /*ARGSUSED*/ static int CheckAddr ( int family, pointer pAddr, unsigned length) { int len; switch (family) { #if defined(TCPCONN) || defined(STREAMSCONN) || defined(MNX_TCPCONN) case FamilyInternet: if (length == sizeof (struct in_addr)) len = length; else len = -1; break; #if defined(IPv6) && defined(AF_INET6) case FamilyInternet6: if (length == sizeof (struct in6_addr)) len = length; else len = -1; break; #endif #endif #ifdef DNETCONN case FamilyDECnet: { struct dn_naddr *dnaddr = (struct dn_naddr *) pAddr; if ((length < sizeof(dnaddr->a_len)) || (length < dnaddr->a_len + sizeof(dnaddr->a_len))) len = -1; else len = dnaddr->a_len + sizeof(dnaddr->a_len); if (len > sizeof(struct dn_naddr)) len = -1; } break; #endif case FamilyServerInterpreted: len = siCheckAddr(pAddr, length); break; default: len = -1; } return (len); } /* Check if a host is not in the access control list. * Returns 1 if host is invalid, 0 if we've found it. */ int InvalidHost ( register struct sockaddr *saddr, int len, ClientPtr client) { int family; pointer addr; register HOST *selfhost, *host; if (!AccessEnabled) /* just let them in */ return(0); family = ConvertAddr (saddr, &len, (pointer *)&addr); if (family == -1) return 1; if (family == FamilyLocal) { if (!LocalHostEnabled) { /* * check to see if any local address is enabled. This * implicitly enables local connections. */ for (selfhost = selfhosts; selfhost; selfhost=selfhost->next) { for (host = validhosts; host; host=host->next) { if (addrEqual (selfhost->family, selfhost->addr, selfhost->len, host)) return 0; } } } else return 0; } for (host = validhosts; host; host = host->next) { if ((host->family == FamilyServerInterpreted)) { if (siAddrMatch (family, addr, len, host, client)) { return (0); } } else { if (addrEqual (family, addr, len, host)) return (0); } } return (1); } static int ConvertAddr ( register struct sockaddr *saddr, int *len, pointer *addr) { if (*len == 0) return (FamilyLocal); switch (saddr->sa_family) { case AF_UNSPEC: #if defined(UNIXCONN) || defined(LOCALCONN) case AF_UNIX: #endif return FamilyLocal; #if defined(TCPCONN) || defined(STREAMSCONN) || defined(MNX_TCPCONN) case AF_INET: #ifdef WIN32 if (16777343 == *(long*)&((struct sockaddr_in *) saddr)->sin_addr) return FamilyLocal; #endif *len = sizeof (struct in_addr); *addr = (pointer) &(((struct sockaddr_in *) saddr)->sin_addr); return FamilyInternet; #if defined(IPv6) && defined(AF_INET6) case AF_INET6: { struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *) saddr; if (IN6_IS_ADDR_V4MAPPED(&(saddr6->sin6_addr))) { *len = sizeof (struct in_addr); *addr = (pointer) &(saddr6->sin6_addr.s6_addr[12]); return FamilyInternet; } else { *len = sizeof (struct in6_addr); *addr = (pointer) &(saddr6->sin6_addr); return FamilyInternet6; } } #endif #endif #ifdef DNETCONN case AF_DECnet: { struct sockaddr_dn *sdn = (struct sockaddr_dn *) saddr; *len = sdn->sdn_nodeaddrl + sizeof(sdn->sdn_nodeaddrl); *addr = (pointer) &(sdn->sdn_add); } return FamilyDECnet; #endif #ifdef CHAOSCONN case AF_CHAOS: { not implemented } return FamilyChaos; #endif default: return -1; } } int ChangeAccessControl( ClientPtr client, int fEnabled) { if (!AuthorizedClient(client)) return BadAccess; AccessEnabled = fEnabled; return Success; } /* returns FALSE if xhost + in effect, else TRUE */ int GetAccessControl(void) { return AccessEnabled; } /***************************************************************************** * FamilyServerInterpreted host entry implementation * * Supports an extensible system of host types which the server can interpret * See the IPv6 extensions to the X11 protocol spec for the definition. * * Currently supported schemes: * * hostname - hostname as defined in IETF RFC 2396 * ipv6 - IPv6 literal address as defined in IETF RFC's 3513 and <TBD> * * See xc/doc/specs/SIAddresses for formal definitions of each type. */ /* These definitions and the siTypeAdd function could be exported in the * future to enable loading additional host types, but that was not done for * the initial implementation. */ typedef Bool (*siAddrMatchFunc)(int family, pointer addr, int len, const char *siAddr, int siAddrlen, ClientPtr client, void *siTypePriv); typedef int (*siCheckAddrFunc)(const char *addrString, int length, void *siTypePriv); struct siType { struct siType * next; const char * typeName; siAddrMatchFunc addrMatch; siCheckAddrFunc checkAddr; void * typePriv; /* Private data for type routines */ }; static struct siType *siTypeList; static int siTypeAdd(const char *typeName, siAddrMatchFunc addrMatch, siCheckAddrFunc checkAddr, void *typePriv) { struct siType *s, *p; if ((typeName == NULL) || (addrMatch == NULL) || (checkAddr == NULL)) return BadValue; for (s = siTypeList, p = NULL; s != NULL ; p = s, s = s->next) { if (strcmp(typeName, s->typeName) == 0) { s->addrMatch = addrMatch; s->checkAddr = checkAddr; s->typePriv = typePriv; return Success; } } s = (struct siType *) xalloc(sizeof(struct siType)); if (s == NULL) return BadAlloc; if (p == NULL) siTypeList = s; else p->next = s; s->next = NULL; s->typeName = typeName; s->addrMatch = addrMatch; s->checkAddr = checkAddr; s->typePriv = typePriv; return Success; } /* Checks to see if a host matches a server-interpreted host entry */ static Bool siAddrMatch(int family, pointer addr, int len, HOST *host, ClientPtr client) { Bool matches = FALSE; struct siType *s; const char *valueString; int addrlen; valueString = (const char *) memchr(host->addr, '\0', host->len); if (valueString != NULL) { for (s = siTypeList; s != NULL ; s = s->next) { if (strcmp((char *) host->addr, s->typeName) == 0) { addrlen = host->len - (strlen((char *)host->addr) + 1); matches = s->addrMatch(family, addr, len, valueString + 1, addrlen, client, s->typePriv); break; } } #ifdef FAMILY_SI_DEBUG ErrorF( "Xserver: siAddrMatch(): type = %s, value = %*.*s -- %s\n", host->addr, addrlen, addrlen, valueString + 1, (matches) ? "accepted" : "rejected"); #endif } return matches; } static int siCheckAddr(const char *addrString, int length) { const char *valueString; int addrlen, typelen; int len = -1; struct siType *s; /* Make sure there is a \0 byte inside the specified length to separate the address type from the address value. */ valueString = (const char *) memchr(addrString, '\0', length); if (valueString != NULL) { /* Make sure the first string is a recognized address type, * and the second string is a valid address of that type. */ typelen = strlen(addrString) + 1; addrlen = length - typelen; for (s = siTypeList; s != NULL ; s = s->next) { if (strcmp(addrString, s->typeName) == 0) { len = s->checkAddr(valueString + 1, addrlen, s->typePriv); if (len >= 0) { len += typelen; } break; } } #ifdef FAMILY_SI_DEBUG { const char *resultMsg; if (s == NULL) { resultMsg = "type not registered"; } else { if (len == -1) resultMsg = "rejected"; else resultMsg = "accepted"; } ErrorF("Xserver: siCheckAddr(): type = %s, value = %*.*s, len = %d -- %s\n", addrString, addrlen, addrlen, valueString + 1, len, resultMsg); } #endif } return len; } /*** * Hostname server-interpreted host type * * Stored as hostname string, explicitly defined to be resolved ONLY * at access check time, to allow for hosts with dynamic addresses * but static hostnames, such as found in some DHCP & mobile setups. * * Hostname must conform to IETF RFC 2396 sec. 3.2.2, which defines it as: * hostname = *( domainlabel "." ) toplabel [ "." ] * domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum * toplabel = alpha | alpha *( alphanum | "-" ) alphanum */ #ifdef NI_MAXHOST # define SI_HOSTNAME_MAXLEN NI_MAXHOST #else # ifdef MAXHOSTNAMELEN # define SI_HOSTNAME_MAXLEN MAXHOSTNAMELEN # else # define SI_HOSTNAME_MAXLEN 256 # endif #endif static Bool siHostnameAddrMatch(int family, pointer addr, int len, const char *siAddr, int siAddrLen, ClientPtr client, void *typePriv) { Bool res = FALSE; /* Currently only supports checking against IPv4 & IPv6 connections, but * support for other address families, such as DECnet, could be added if * desired. */ #if defined(IPv6) && defined(AF_INET6) if ((family == FamilyInternet) || (family == FamilyInternet6)) { char hostname[SI_HOSTNAME_MAXLEN]; struct addrinfo *addresses; struct addrinfo *a; int f, hostaddrlen; pointer hostaddr; if (siAddrLen >= sizeof(hostname)) return FALSE; strncpy(hostname, siAddr, siAddrLen); hostname[siAddrLen] = '\0'; if (getaddrinfo(hostname, NULL, NULL, &addresses) == 0) { for (a = addresses ; a != NULL ; a = a->ai_next) { hostaddrlen = a->ai_addrlen; f = ConvertAddr(a->ai_addr,&hostaddrlen,&hostaddr); if ((f == family) && (len == hostaddrlen) && (acmp (addr, hostaddr, len) == 0) ) { res = TRUE; break; } } freeaddrinfo(addresses); } } #else /* IPv6 not supported, use gethostbyname instead for IPv4 */ if (family == FamilyInternet) { register struct hostent *hp; #ifdef XTHREADS_NEEDS_BYNAMEPARAMS _Xgethostbynameparams hparams; #endif char hostname[SI_HOSTNAME_MAXLEN]; int f, hostaddrlen; pointer hostaddr; const char **addrlist; if (siAddrLen >= sizeof(hostname)) return FALSE; strncpy(hostname, siAddr, siAddrLen); hostname[siAddrLen] = '\0'; if ((hp = _XGethostbyname(hostname, hparams)) != NULL) { #ifdef h_addr /* new 4.3bsd version of gethostent */ /* iterate over the addresses */ for (addrlist = hp->h_addr_list; *addrlist; addrlist++) #else addrlist = &hp->h_addr; #endif { struct sockaddr_in sin; sin.sin_family = hp->h_addrtype; acopy ( *addrlist, &(sin.sin_addr), hp->h_length); hostaddrlen = sizeof(sin); f = ConvertAddr ((struct sockaddr *)&sin, &hostaddrlen, &hostaddr); if ((f == family) && (len == hostaddrlen) && (acmp (addr, hostaddr, len) == 0) ) { res = TRUE; break; } } } } #endif return res; } static int siHostnameCheckAddr(const char *valueString, int length, void *typePriv) { /* Check conformance of hostname to RFC 2396 sec. 3.2.2 definition. * We do not use ctype functions here to avoid locale-specific * character sets. Hostnames must be pure ASCII. */ int len = length; int i; Bool dotAllowed = FALSE; Bool dashAllowed = FALSE; if ((length <= 0) || (length >= SI_HOSTNAME_MAXLEN)) { len = -1; } else { for (i = 0; i < length; i++) { char c = valueString[i]; if (c == 0x2E) { /* '.' */ if (dotAllowed == FALSE) { len = -1; break; } else { dotAllowed = FALSE; dashAllowed = FALSE; } } else if (c == 0x2D) { /* '-' */ if (dashAllowed == FALSE) { len = -1; break; } else { dotAllowed = FALSE; } } else if (((c >= 0x30) && (c <= 0x3A)) /* 0-9 */ || ((c >= 0x61) && (c <= 0x7A)) /* a-z */ || ((c >= 0x41) && (c <= 0x5A)) /* A-Z */) { dotAllowed = TRUE; dashAllowed = TRUE; } else { /* Invalid character */ len = -1; break; } } } return len; } #if defined(IPv6) && defined(AF_INET6) /*** * "ipv6" server interpreted type * * Currently supports only IPv6 literal address as specified in IETF RFC 3513 * * Once draft-ietf-ipv6-scoping-arch-00.txt becomes an RFC, support will be * added for the scoped address format it specifies. */ /* Maximum length of an IPv6 address string - increase when adding support * for scoped address qualifiers. Includes room for trailing NUL byte. */ #define SI_IPv6_MAXLEN INET6_ADDRSTRLEN static Bool siIPv6AddrMatch(int family, pointer addr, int len, const char *siAddr, int siAddrlen, ClientPtr client, void *typePriv) { struct in6_addr addr6; char addrbuf[SI_IPv6_MAXLEN]; if ((family != FamilyInternet6) || (len != sizeof(addr6))) return FALSE; memcpy(addrbuf, siAddr, siAddrlen); addrbuf[siAddrlen] = '\0'; if (inet_pton(AF_INET6, addrbuf, &addr6) != 1) { perror("inet_pton"); return FALSE; } if (memcmp(addr, &addr6, len) == 0) { return TRUE; } else { return FALSE; } } static int siIPv6CheckAddr(const char *addrString, int length, void *typePriv) { int len; /* Minimum length is 3 (smallest legal address is "::1") */ if (length < 3) { /* Address is too short! */ len = -1; } else if (length >= SI_IPv6_MAXLEN) { /* Address is too long! */ len = -1; } else { /* Assume inet_pton is sufficient validation */ struct in6_addr addr6; char addrbuf[SI_IPv6_MAXLEN]; memcpy(addrbuf, addrString, length); addrbuf[length] = '\0'; if (inet_pton(AF_INET6, addrbuf, &addr6) != 1) { perror("inet_pton"); len = -1; } else { len = length; } } return len; } #endif /* IPv6 */ #if !defined(NO_LOCAL_CLIENT_CRED) /*** * "localuser" & "localgroup" server interpreted types * * Allows local connections from a given local user or group */ #include <pwd.h> #include <grp.h> #define LOCAL_USER 1 #define LOCAL_GROUP 2 typedef struct { int credType; } siLocalCredPrivRec, *siLocalCredPrivPtr; static siLocalCredPrivRec siLocalUserPriv = { LOCAL_USER }; static siLocalCredPrivRec siLocalGroupPriv = { LOCAL_GROUP }; static Bool siLocalCredGetId(const char *addr, int len, siLocalCredPrivPtr lcPriv, int *id) { Bool parsedOK = FALSE; char *addrbuf = xalloc(len + 1); if (addrbuf == NULL) { return FALSE; } memcpy(addrbuf, addr, len); addrbuf[len] = '\0'; if (addr[0] == '#') { /* numeric id */ char *cp; errno = 0; *id = strtol(addrbuf + 1, &cp, 0); if ((errno == 0) && (cp != (addrbuf+1))) { parsedOK = TRUE; } } else { /* non-numeric name */ if (lcPriv->credType == LOCAL_USER) { struct passwd *pw = getpwnam(addrbuf); if (pw != NULL) { *id = (int) pw->pw_uid; parsedOK = TRUE; } } else { /* group */ struct group *gr = getgrnam(addrbuf); if (gr != NULL) { *id = (int) gr->gr_gid; parsedOK = TRUE; } } } xfree(addrbuf); return parsedOK; } static Bool siLocalCredAddrMatch(int family, pointer addr, int len, const char *siAddr, int siAddrlen, ClientPtr client, void *typePriv) { int connUid, connGid, *connSuppGids, connNumSuppGids, siAddrId; siLocalCredPrivPtr lcPriv = (siLocalCredPrivPtr) typePriv; if (LocalClientCredAndGroups(client, &connUid, &connGid, &connSuppGids, &connNumSuppGids) == -1) { return FALSE; } if (siLocalCredGetId(siAddr, siAddrlen, lcPriv, &siAddrId) == FALSE) { return FALSE; } if (lcPriv->credType == LOCAL_USER) { if (connUid == siAddrId) { return TRUE; } } else { if (connGid == siAddrId) { return TRUE; } if (connSuppGids != NULL) { int i; for (i = 0 ; i < connNumSuppGids; i++) { if (connSuppGids[i] == siAddrId) { xfree(connSuppGids); return TRUE; } } xfree(connSuppGids); } } return FALSE; } static int siLocalCredCheckAddr(const char *addrString, int length, void *typePriv) { int len = length; int id; if (siLocalCredGetId(addrString, length, (siLocalCredPrivPtr)typePriv, &id) == FALSE) { len = -1; } return len; } #endif /* localuser */ static void siTypesInitialize(void) { siTypeAdd("hostname", siHostnameAddrMatch, siHostnameCheckAddr, NULL); #if defined(IPv6) && defined(AF_INET6) siTypeAdd("ipv6", siIPv6AddrMatch, siIPv6CheckAddr, NULL); #endif #if !defined(NO_LOCAL_CLIENT_CRED) siTypeAdd("localuser", siLocalCredAddrMatch, siLocalCredCheckAddr, &siLocalUserPriv); siTypeAdd("localgroup", siLocalCredAddrMatch, siLocalCredCheckAddr, &siLocalGroupPriv); #endif }