/* Copyright 1988, 1998 The Open Group Copyright 2000-2004 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 * * maintain the authorization generation daemon */ #include "dm.h" #include "dm_auth.h" #include "dm_error.h" #include #include #include #ifdef __OpenBSD__ #include #endif #include #include "dm_socket.h" #ifdef DNETCONN # include #endif #if (defined(_POSIX_SOURCE) && !defined(_AIX) && !defined(__QNX__)) || defined(__hpux) || defined(__svr4__) /* XXX */ # define NEED_UTSNAME # include #endif #ifdef __GNU__ # include # undef SIOCGIFCONF #else /* __GNU__ */ # include # ifdef __svr4__ # include # include # include # endif # ifdef __EMX__ # define link rename # define chown(a,b,c) # include # endif #endif /* __GNU__ */ struct AuthProtocol { unsigned short name_length; const char *name; void (*InitAuth)( unsigned short len, const char *name ); Xauth *(*GetAuth)( unsigned short len, const char *name ); #ifdef XDMCP void (*GetXdmcpAuth)( struct protoDisplay *pdpy, unsigned short authorizationNameLen, const char *authorizationName ); #endif int inited; }; #ifdef XDMCP # define xdmcpauth(arg) , arg #else # define xdmcpauth(arg) #endif static struct AuthProtocol AuthProtocols[] = { { (unsigned short)18, "MIT-MAGIC-COOKIE-1", MitInitAuth, MitGetAuth xdmcpauth(NULL), 0 }, #ifdef HASXDMAUTH { (unsigned short)19, "XDM-AUTHORIZATION-1", XdmInitAuth, XdmGetAuth xdmcpauth(XdmGetXdmcpAuth), 0 }, #endif #ifdef SECURE_RPC { (unsigned short)9, "SUN-DES-1", SecureRPCInitAuth, SecureRPCGetAuth xdmcpauth(NULL), 0 }, #endif #ifdef K5AUTH { (unsigned short)14, "MIT-KERBEROS-5", Krb5InitAuth, Krb5GetAuth xdmcpauth(NULL), 0 }, #endif }; static struct AuthProtocol * findProtocol( unsigned short name_length, const char *name ) { unsigned i; for (i = 0; i < as(AuthProtocols); i++) if (AuthProtocols[i].name_length == name_length && memcmp( AuthProtocols[i].name, name, name_length ) == 0) { return &AuthProtocols[i]; } return (struct AuthProtocol *)0; } int ValidAuthorization( unsigned short name_length, const char *name ) { if (findProtocol( name_length, name )) return TRUE; return FALSE; } static Xauth * GenerateAuthorization( unsigned short name_length, const char *name ) { struct AuthProtocol *a; Xauth *auth = 0; Debug( "GenerateAuthorization %s\n", name ); if ((a = findProtocol( name_length, name ))) { if (!a->inited) { (*a->InitAuth)( name_length, name ); a->inited = TRUE; } auth = (*a->GetAuth)( name_length, name ); if (auth) { Debug( "got %p (%d %.*s) %02[*hhx\n", auth, auth->name_length, auth->name_length, auth->name, auth->data_length, auth->data ); } else Debug( "got (null)\n" ); } else Debug( "unknown authorization %s\n", name ); return auth; } #ifdef XDMCP void SetProtoDisplayAuthorization( struct protoDisplay *pdpy, unsigned short authorizationNameLen, const char *authorizationName ) { struct AuthProtocol *a; Xauth *auth; a = findProtocol( authorizationNameLen, authorizationName ); pdpy->xdmcpAuthorization = pdpy->fileAuthorization = 0; if (a) { if (!a->inited) { (*a->InitAuth)( authorizationNameLen, authorizationName ); a->inited = TRUE; } if (a->GetXdmcpAuth) { (*a->GetXdmcpAuth)( pdpy, authorizationNameLen, authorizationName ); auth = pdpy->xdmcpAuthorization; } else { auth = (*a->GetAuth)( authorizationNameLen, authorizationName ); pdpy->fileAuthorization = auth; pdpy->xdmcpAuthorization = 0; } if (auth) Debug( "got %p (%d %.*s)\n", auth, auth->name_length, auth->name_length, auth->name ); else Debug( "got (null)\n" ); } } #endif /* XDMCP */ void CleanUpFileName( const char *src, char *dst, int len ) { while (*src) { if (--len <= 0) break; switch (*src & 0x7f) { case '/': *dst++ = '_'; break; case '-': *dst++ = '.'; break; default: *dst++ = (*src & 0x7f); } ++src; } *dst = '\0'; } static FILE * fdOpenW( int fd ) { FILE *f; if (fd >= 0) { if ((f = fdopen( fd, "w" ))) return f; close( fd ); } return 0; } static FILE * mkTempFile( char *nambuf, int namelen ) { FILE *f; int r; for (r = 0; r < 100; r++) { randomStr( nambuf + namelen ); if ((f = fdOpenW( open( nambuf, O_WRONLY | O_CREAT | O_EXCL, 0600 ) ))) return f; if (errno != EEXIST) break; } return 0; } #define NAMELEN 255 static FILE * MakeServerAuthFile( struct display *d ) { FILE *f; int i; char cleanname[NAMELEN], nambuf[NAMELEN+128]; /* * Some paranoid, but still not sufficient (DoS was still possible) * checks used to be here. I removed all this stuff because * a) authDir is supposed to be /var/run/xauth (=safe) or similar and * b) even if it's not (say, /tmp), we create files safely (hopefully). */ if (mkdir( authDir, 0755 ) < 0 && errno != EEXIST) return 0; CleanUpFileName( d->name, cleanname, NAMELEN - 8 ); i = sprintf( nambuf, "%s/A%s-", authDir, cleanname ); if ((f = mkTempFile( nambuf, i ))) { StrDup( &d->authFile, nambuf ); return f; } return 0; } int SaveServerAuthorizations( struct display *d, Xauth **auths, int count ) { FILE *auth_file; int i; if (!d->authFile && d->clientAuthFile && *d->clientAuthFile) StrDup( &d->authFile, d->clientAuthFile ); if (d->authFile) { if (!(auth_file = fdOpenW( creat( d->authFile, 0600 ) ))) { LogError( "Cannot open X server authorization file %s\n", d->authFile ); free( d->authFile ); d->authFile = NULL; return FALSE; } } else { if (!(auth_file = MakeServerAuthFile( d ))) { LogError( "Cannot create X server authorization file\n" ); return FALSE; } } #ifdef __OpenBSD__ { struct passwd *x11; uid_t uid; gid_t gid; /* Give read capability to group _x11 */ x11 = getpwnam("_x11"); if (x11 == NULL) { LogError("Can't find _x11 user\n"); uid = getuid(); gid = getgid(); } else { uid = x11->pw_uid; gid = x11->pw_gid; } fchown(fileno(auth_file), uid, gid); } #endif Debug( "file: %s auth: %p\n", d->authFile, auths ); for (i = 0; i < count; i++) { /* * User-based auths may not have data until * a user logs in. In which case don't write * to the auth file so xrdb and setup programs don't fail. */ if (auths[i]->data_length > 0) if (!XauWriteAuth( auth_file, auths[i] ) || fflush( auth_file ) == EOF) { fclose( auth_file ); LogError( "Cannot write X server authorization file %s\n", d->authFile ); free( d->authFile ); d->authFile = NULL; return FALSE; } } fclose( auth_file ); return TRUE; } void SetLocalAuthorization( struct display *d ) { Xauth *auth, **auths; int i, j; if (d->authorizations) { for (i = 0; i < d->authNum; i++) XauDisposeAuth( d->authorizations[i] ); free( (char *)d->authorizations ); d->authorizations = (Xauth **)NULL; d->authNum = 0; } Debug( "SetLocalAuthorization %s, auths %[s\n", d->name, d->authNames ); if (!d->authNames) return; for (i = 0; d->authNames[i]; i++) ; d->authNameNum = i; if (d->authNameLens) free( (char *)d->authNameLens ); d->authNameLens = (unsigned short *)Malloc( d->authNameNum * sizeof(unsigned short) ); if (!d->authNameLens) return; for (i = 0; i < d->authNameNum; i++) d->authNameLens[i] = strlen( d->authNames[i] ); auths = (Xauth **)Malloc( d->authNameNum * sizeof(Xauth *) ); if (!auths) return; j = 0; for (i = 0; i < d->authNameNum; i++) { auth = GenerateAuthorization( d->authNameLens[i], d->authNames[i] ); if (auth) auths[j++] = auth; } if (SaveServerAuthorizations( d, auths, j )) { d->authorizations = auths; d->authNum = j; } else { for (i = 0; i < j; i++) XauDisposeAuth( auths[i] ); free( (char *)auths ); } } /* * Set the authorization to use for xdm's initial connection * to the X server. Cannot use user-based authorizations * because no one has logged in yet, so we don't have any * user credentials. * Well, actually we could use SUN-DES-1 because we tell the server * to allow root in. This is bogus and should be fixed. */ void SetAuthorization( struct display *d ) { register Xauth **auth = d->authorizations; int i; for (i = 0; i < d->authNum; i++) { if (auth[i]->name_length == 9 && memcmp( auth[i]->name, "SUN-DES-1", 9 ) == 0) continue; if (auth[i]->name_length == 14 && memcmp( auth[i]->name, "MIT-KERBEROS-5", 14 ) == 0) continue; XSetAuthorization( auth[i]->name, (int)auth[i]->name_length, auth[i]->data, (int)auth[i]->data_length ); } } static int openFiles( const char *name, char *new_name, FILE **oldp, FILE **newp ) { strcat( strcpy( new_name, name ), "-n" ); if (!(*newp = fdOpenW( creat( new_name, 0600 ) ))) { Debug( "can't open new file %s\n", new_name ); return 0; } *oldp = fopen( name, "r" ); Debug( "opens succeeded %s %s\n", name, new_name ); return 1; } struct addrList { struct addrList *next; unsigned short family, address_length, number_length; char data[1]; }; static struct addrList *addrs; static void initAddrs( void ) { addrs = 0; } static void doneAddrs( void ) { struct addrList *a, *n; for (a = addrs; a; a = n) { n = a->next; free( a ); } } static void saveEntry( Xauth *auth ) { struct addrList *new; if (!(new = Malloc( offsetof(struct addrList, data) + auth->address_length + auth->number_length ))) return; new->address_length = auth->address_length; new->number_length = auth->number_length; memcpy( new->data, auth->address, (int)auth->address_length ); memcpy( new->data + (int)auth->address_length, auth->number, (int)auth->number_length ); new->family = auth->family; new->next = addrs; addrs = new; } static int checkEntry( Xauth *auth ) { struct addrList *a; for (a = addrs; a; a = a->next) if (a->family == auth->family && a->address_length == auth->address_length && !memcmp( a->data, auth->address, auth->address_length ) && a->number_length == auth->number_length && !memcmp( a->data + a->address_length, auth->number, auth->number_length )) return 1; return 0; } static void writeAuth( FILE *file, Xauth *auth, int *ok ) { if (debugLevel & DEBUG_AUTH) /* normally too verbose */ Debug( "writeAuth: doWrite = %d\n" "family: %d\n" "addr: %02[*:hhx\n" "number: %02[*:hhx\n" "name: %02[*:hhx\n" "data: %02[*:hhx\n", ok != 0, auth->family, auth->address_length, auth->address, auth->number_length, auth->number, auth->name_length, auth->name, auth->data_length, auth->data ); if (ok && !XauWriteAuth( file, auth )) *ok = FALSE; } static void writeAddr( int family, int addr_length, char *addr, FILE *file, Xauth *auth, int *ok ) { auth->family = (unsigned short)family; auth->address_length = addr_length; auth->address = addr; Debug( "writeAddr: writing and saving an entry\n" ); writeAuth( file, auth, ok ); if (!checkEntry( auth )) saveEntry( auth ); } static void DefineLocal( FILE *file, Xauth *auth, int *ok ) { #if !defined(NEED_UTSNAME) || defined(__hpux) char displayname[100]; #endif #ifdef NEED_UTSNAME struct utsname name; #endif /* stolen from xinit.c */ /* Make sure this produces the same string as _XGetHostname in lib/X/XlibInt.c. * Otherwise, Xau will not be able to find your cookies in the Xauthority file. * * Note: POSIX says that the ``nodename'' member of utsname does _not_ have * to have sufficient information for interfacing to the network, * and so, you may be better off using gethostname (if it exists). */ #ifdef NEED_UTSNAME /* hpux: * 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. */ uname( &name ); writeAddr( FamilyLocal, strlen( name.nodename ), name.nodename, file, auth, ok ); #endif #if !defined(NEED_UTSNAME) || defined(__hpux) /* _AIX: * In _AIX, _POSIX_SOURCE is defined, but uname gives only first * field of hostname. Thus, we use gethostname instead. */ /* * For HP-UX, HP's Xlib expects a fully-qualified domain name, which * is achieved by using gethostname(). For compatability, we must * also still create the entry using uname() above. */ displayname[0] = 0; if (!gethostname( displayname, sizeof(displayname) )) displayname[sizeof(displayname) - 1] = 0; # ifdef NEED_UTSNAME /* * If gethostname and uname both returned the same name, * do not write a duplicate entry. */ if (strcmp( displayname, name.nodename )) # endif writeAddr( FamilyLocal, strlen( displayname ), displayname, file, auth, ok ); #endif } #ifdef SYSV_SIOCGIFCONF /* Deal with different SIOCGIFCONF ioctl semantics on SYSV, SVR4 */ 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; } else { ioc.ic_len = sizeof(struct ifreq); ioc.ic_dp = arg; } ret = ioctl( fd, I_STR, (char *)&ioc ); if (ret >= 0 && cmd == SIOCGIFCONF) ((struct ifconf *)arg)->ifc_len = ioc.ic_len; return (ret); } #endif /* SYSV_SIOCGIFCONF */ #ifdef HAVE_GETIFADDRS # include static void DefineSelf( FILE *file, Xauth *auth, int *ok ) { struct ifaddrs *ifap, *ifr; char *addr; int family, len; if (getifaddrs( &ifap ) < 0) return; for (ifr = ifap; ifr; ifr = ifr->ifa_next) { if (!ifr->ifa_addr) continue; family = ConvertAddr( (char *)(ifr->ifa_addr), &len, &addr ); if (family == -1 || family == FamilyLocal) continue; /* * don't write out 'localhost' entries, as * they may conflict with other local entries. * DefineLocal will always be called to add * the local entry anyway, so this one can * be tossed. */ if (family == FamilyInternet && addr[0] == 127 && addr[1] == 0 && addr[2] == 0 && addr[3] == 1) { Debug( "Skipping localhost address\n" ); continue; } # if defined(IPv6) && defined(AF_INET6) if (family == FamilyInternet6) { if (IN6_IS_ADDR_LOOPBACK( ((struct in6_addr *)addr) )) { Debug( "Skipping IPv6 localhost address\n" ); continue; } /* Also skip XDM-AUTHORIZATION-1 */ if (auth->name_length == 19 && !memcmp( auth->name, "XDM-AUTHORIZATION-1", 19 )) { Debug( "Skipping IPv6 XDM-AUTHORIZATION-1\n" ); continue; } } # endif writeAddr( family, len, addr, file, auth, ok ); } freeifaddrs( ifap ); } #else /* GETIFADDRS */ #if defined(STREAMSCONN) && !defined(SYSV_SIOCGIFCONF) && !defined(WINTCP) #include /* Define this host for access control. Find all the hosts the OS knows about * for this fd and add them to the selfhosts list. * TLI version, written without sufficient documentation. */ static void DefineSelf( int fd, FILE *file, Xauth *auth, int *ok ) { struct netbuf netb; char addrret[1024]; /* easier than t_alloc */ netb.maxlen = sizeof(addrret); netb.buf = addrret; if (t_getname( fd, &netb, LOCALNAME ) == -1) t_error( "t_getname" ); /* what a kludge */ writeAddr( FamilyInternet, 4, netb.buf+4, file, auth, ok ); } #else #ifdef WINTCP /* NCR with Wollongong TCP */ #include #include #include #include #include #include #include #include static void DefineSelf( int fd, FILE *file, Xauth *auth, int *ok ) { /* * The Wollongong 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; int len, ipfd; if ((ipfd = open( "/dev/ip", O_RDWR, 0 )) < 0) { LogError( "Trouble getting interface configuration\n" ); return; } /* 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( ipfd, (int)I_STR, (char *)&str ) < 0) { close( ipfd ); LogError( "Trouble getting interface configuration\n" ); return; } 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( ipfd, (int)I_STR, (char *)&str ) < 0) { close( ipfd ); LogError( "Trouble getting interface configuration\n" ); return; } /* * Ignore the 127.0.0.1 entry. */ if (IA_SIN( &ifaddr )->sin_addr.s_addr == htonl( 0x7f000001 ) ) continue; writeAddr( FamilyInternet, 4, (char *)&(IA_SIN( &ifaddr )->sin_addr), file, auth, ok ); } close( ipfd ); } #else /* WINTCP */ /* 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 #if defined(SIOCGIFCONF) || defined (USE_SIOCGLIFCONF) #if !defined(SYSV_SIOCGIFCONF) || defined(USE_SIOCGLIFCONF) # define ifioctl ioctl #endif #ifdef USE_SIOCGLIFCONF # define ifr_type struct lifreq #else # define ifr_type struct ifreq #endif /* Handle variable length ifreq in BNR2 and later */ #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)) #else # define ifr_size(p) (sizeof(ifr_type)) #endif #ifdef USE_SIOCGLIFCONF # define IFC_IOCTL_REQ SIOCGLIFCONF # define IFC_REQ(ifc) ifc.lifc_req # define IFC_LEN(ifc) ifc.lifc_len # define IFR_ADDR(ifr) ifr->lifr_addr # define IFR_NAME(ifr) ifr->lifr_name #else # define IFC_IOCTL_REQ SIOCGIFCONF # define IFC_REQ(ifc) ifc.ifc_req # define IFC_LEN(ifc) ifc.ifc_len # define IFR_ADDR(ifr) ifr->ifr_addr # define IFR_NAME(ifr) ifr->ifr_name #endif /* Define this host for access control. Find all the hosts the OS knows about * for this fd and add them to the selfhosts list. */ static void DefineSelf( int fd, FILE *file, Xauth *auth, int *ok ) { char buf[2048], *cp, *cplim; int len; char *addr; int family; ifr_type *ifr; #ifdef USE_SIOCGLIFCONF int n; void * bufptr = buf; size_t buflen = sizeof(buf); struct lifconf ifc; # ifdef SIOCGLIFNUM struct lifnum ifn; # endif #else struct ifconf ifc; #endif #if defined(SIOCGLIFNUM) && defined(SIOCGLIFCONF) ifn.lifn_family = AF_UNSPEC; ifn.lifn_flags = 0; if (ioctl( fd, (int)SIOCGLIFNUM, (char *)&ifn ) < 0) LogError( "Failed getting interface count\n" ); if (buflen < (ifn.lifn_count * sizeof(struct lifreq))) { buflen = ifn.lifn_count * sizeof(struct lifreq); bufptr = Malloc( buflen ); } #endif #ifdef USE_SIOCGLIFCONF ifc.lifc_family = AF_UNSPEC; ifc.lifc_flags = 0; ifc.lifc_len = buflen; ifc.lifc_buf = bufptr; #else ifc.ifc_len = sizeof(buf); ifc.ifc_buf = buf; #endif if (ifioctl (fd, IFC_IOCTL_REQ, (char *)&ifc) < 0) { LogError( "Trouble getting network interface configuration\n" ); #if defined(SIOCGLIFNUM) && defined(SIOCGLIFCONF) if (bufptr != buf) free( bufptr ); #endif return; } cplim = (char *)IFC_REQ( ifc ) + IFC_LEN( ifc ); for (cp = (char *)IFC_REQ( ifc ); cp < cplim; cp += ifr_size (ifr)) { ifr = (ifr_type *) cp; #ifdef DNETCONN /* * this is ugly but SIOCGIFCONF returns decnet addresses in * a different form from other decnet calls */ if (IFR_ADDR( ifr ).sa_family == AF_DECnet) { len = sizeof(struct dn_naddr); addr = (char *)IFR_ADDR( ifr ).sa_data; family = FamilyDECnet; } else #endif { family = ConvertAddr( (char *)&IFR_ADDR( ifr ), &len, &addr ); if (family < 0) continue; if (len == 0) { Debug( "skipping zero length address\n" ); continue; } /* * don't write out 'localhost' entries, as * they may conflict with other local entries. * DefineLocal will always be called to add * the local entry anyway, so this one can * be tossed. */ if (family == FamilyInternet && addr[0] == 127 && addr[1] == 0 && addr[2] == 0 && addr[3] == 1) { Debug( "skipping localhost address\n" ); continue; } #if defined(IPv6) && defined(AF_INET6) if (family == FamilyInternet6) { if (IN6_IS_ADDR_LOOPBACK( ((struct in6_addr *)addr) )) { Debug( "Skipping IPv6 localhost address\n" ); continue; } /* Also skip XDM-AUTHORIZATION-1 */ if (auth->name_length == 19 && !memcmp( auth->name, "XDM-AUTHORIZATION-1", 19 )) { Debug( "Skipping IPv6 XDM-AUTHORIZATION-1\n" ); continue; } } #endif } Debug( "DefineSelf: write network address, length %d\n", len ); writeAddr( family, len, addr, file, auth, ok ); } #if defined(SIOCGLIFNUM) && defined(SIOCGLIFCONF) if (bufptr != buf) free( bufptr ); #endif } #else /* SIOCGIFCONF */ /* Define this host for access control. Find all the hosts the OS knows about * for this fd and add them to the selfhosts list. */ static void DefineSelf( int fd, int file, int auth, int *ok ) { int len; caddr_t addr; int family; struct utsname name; register struct hostent *hp; union { struct sockaddr sa; struct sockaddr_in in; } saddr; struct sockaddr_in *inetaddr; /* hpux: * 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. */ uname( &name ); if ((hp = gethostbyname( name.nodename ))) { saddr.sa.sa_family = hp->h_addrtype; inetaddr = (struct sockaddr_in *)(&(saddr.sa)); memmove( (char *)&(inetaddr->sin_addr), (char *)hp->h_addr, (int)hp->h_length ); if ( (family = ConvertAddr( &(saddr.sa), &len, &addr )) >= 0) writeAddr( FamilyInternet, sizeof(inetaddr->sin_addr), (char *)(&inetaddr->sin_addr), file, auth, ok ); } } #endif /* SIOCGIFCONF else */ #endif /* WINTCP else */ #endif /* STREAMSCONN && !SYSV_SIOCGIFCONF else */ #endif /* HAVE_GETIFADDRS */ static void setAuthNumber( Xauth *auth, const char *name ) { char *colon; char *dot; Debug( "setAuthNumber %s\n", name ); colon = strrchr( name, ':' ); if (colon) { ++colon; dot = strchr( colon, '.' ); if (dot) auth->number_length = dot - colon; else auth->number_length = strlen( colon ); if (!StrNDup( &auth->number, colon, auth->number_length )) auth->number_length = 0; Debug( "setAuthNumber: %s\n", auth->number ); } } static void writeLocalAuth( FILE *file, Xauth *auth, const char *name, int *ok ) { #if defined(STREAMSCONN) || !defined(HAVE_GETIFADDRS) int fd; #endif Debug( "writeLocalAuth: %s %.*s\n", name, auth->name_length, auth->name ); setAuthNumber( auth, name ); # ifdef STREAMSCONN fd = t_open( "/dev/tcp", O_RDWR, 0 ); t_bind( fd, NULL, NULL ); DefineSelf( fd, file, auth, ok ); t_unbind( fd ); t_close( fd ); # elif defined(HAVE_GETIFADDRS) DefineSelf( file, auth, ok ); # else # ifdef TCPCONN # if defined(IPv6) && defined(AF_INET6) fd = socket( AF_INET6, SOCK_STREAM, 0 ); if (fd < 0) # endif fd = socket( AF_INET, SOCK_STREAM, 0 ); DefineSelf( fd, file, auth, ok ); close( fd ); # endif # ifdef DNETCONN fd = socket( AF_DECnet, SOCK_STREAM, 0 ); DefineSelf( fd, file, auth, ok ); close( fd ); # endif # endif /* HAVE_GETIFADDRS */ DefineLocal( file, auth, ok ); } #ifdef XDMCP /* * Call ConvertAddr(), and if it returns an IPv4 localhost, convert it * to a local display name. Meets the _XTransConvertAddress's localhost * hack. */ static int ConvertAuthAddr( char *saddr, int *len, char **addr ) { int ret = ConvertAddr( saddr, len, addr ); if (ret == FamilyInternet && ((struct in_addr *)*addr)->s_addr == htonl( 0x7F000001L )) ret = FamilyLocal; return ret; } static void writeRemoteAuth( FILE *file, Xauth *auth, XdmcpNetaddr peer, int peerlen, const char *name, int *ok ) { int family = FamilyLocal; char *addr; Debug( "writeRemoteAuth: %s %.*s\n", name, auth->name_length, auth->name ); if (!peer || peerlen < 2) return; setAuthNumber( auth, name ); family = ConvertAuthAddr( peer, &peerlen, &addr ); Debug( "writeRemoteAuth: family %d\n", family ); if (family != FamilyLocal) { Debug( "writeRemoteAuth: %d, %02[*:hhx\n", family, peerlen, addr ); writeAddr( family, peerlen, addr, file, auth, ok ); } else writeLocalAuth( file, auth, name, ok ); } #endif /* XDMCP */ #define NBSIZE 1024 static void startUserAuth( char *buf, char *nbuf, FILE **old, FILE **new ) { const char *home; int lockStatus; initAddrs(); *new = 0; if ((home = getEnv( userEnviron, "HOME" )) && strlen( home ) < NBSIZE - 12) { sprintf( buf, "%s/.Xauthority", home ); Debug( "XauLockAuth %s\n", buf ); lockStatus = XauLockAuth( buf, 1, 2, 10 ); Debug( "lock is %d\n", lockStatus ); if (lockStatus == LOCK_SUCCESS) if (!openFiles( buf, nbuf, old, new )) XauUnlockAuth( buf ); } if (!*new) LogWarn( "Can't update authorization file in home dir %s\n", home ); } static int endUserAuth( FILE *old, FILE *new, const char *nname, int ok ) { Xauth *entry; struct stat statb; if (old) { if (fstat( fileno( old ), &statb ) != -1) chmod( nname, (int)(statb.st_mode & 0777) ); /*SUPPRESS 560*/ while ((entry = XauReadAuth( old ))) { if (!checkEntry( entry )) { Debug( "writing an entry\n" ); writeAuth( new, entry, &ok ); } XauDisposeAuth( entry ); } fclose( old ); } if (fclose( new ) == EOF) ok = FALSE; doneAddrs(); return ok; } static void undoUserAuth( const char *name, const char *new_name ) { LogWarn( "Can't save user authorization in home dir\n" ); unlink( new_name ); XauUnlockAuth( name ); } static char * moveUserAuth( const char *name, char *new_name, char *envname ) { if (unlink( name )) Debug( "unlink %s failed\n", name ); if (link( new_name, name )) { Debug( "link failed %s %s\n", new_name, name ); LogError( "Can't move user authorization into place\n" ); envname = new_name; } else { Debug( "new authorization moved into place\n" ); unlink( new_name ); } XauUnlockAuth( name ); return envname; } void SetUserAuthorization( struct display *d ) { FILE *old, *new; char *name; char *envname; Xauth **auths; int i, ok; int magicCookie; int data_len; char name_buf[NBSIZE], new_name[NBSIZE + 2]; Debug( "SetUserAuthorization\n" ); auths = d->authorizations; if (auths) { startUserAuth( name_buf, new_name, &old, &new ); if (new) { envname = 0; name = name_buf; } else { fallback: if (strlen( d->userAuthDir ) >= NBSIZE - 13) return; /* * Note, that we don't lock the auth file here, as it's * temporary - we can assume, that we are the only ones * knowing about this file anyway. */ i = sprintf( name_buf, "%s/.Xauth", d->userAuthDir ); new = mkTempFile( name_buf, i ); if (!new) { LogError( "Can't create authorization file in %s\n", d->userAuthDir ); return; } name = 0; envname = name_buf; old = 0; } ok = TRUE; Debug( "%d authorization protocols for %s\n", d->authNum, d->name ); /* * Write MIT-MAGIC-COOKIE-1 authorization first, so that * R4 clients which only knew that, and used the first * matching entry will continue to function */ magicCookie = -1; for (i = 0; i < d->authNum; i++) { if (auths[i]->name_length == 18 && !memcmp( auths[i]->name, "MIT-MAGIC-COOKIE-1", 18 )) { magicCookie = i; if ((d->displayType & d_location) == dLocal) writeLocalAuth( new, auths[i], d->name, &ok ); #ifdef XDMCP else writeRemoteAuth( new, auths[i], (XdmcpNetaddr)d->peer.data, d->peer.length, d->name, &ok ); #endif break; } } /* now write other authorizations */ for (i = 0; i < d->authNum; i++) { if (i != magicCookie) { data_len = auths[i]->data_length; /* client will just use default Kerberos cache, so don't * even write cache info into the authority file. */ if (auths[i]->name_length == 14 && !strncmp( auths[i]->name, "MIT-KERBEROS-5", 14 )) auths[i]->data_length = 0; if ((d->displayType & d_location) == dLocal) writeLocalAuth( new, auths[i], d->name, &ok ); #ifdef XDMCP else writeRemoteAuth( new, auths[i], (XdmcpNetaddr)d->peer.data, d->peer.length, d->name, &ok ); #endif auths[i]->data_length = data_len; } } if (!endUserAuth( old, new, new_name, ok )) { if (!name) { LogError( "Can't save user authorization\n" ); return; } undoUserAuth( name, new_name ); initAddrs(); goto fallback; } if (name) envname = moveUserAuth( name, new_name, envname ); if (envname) { userEnviron = setEnv( userEnviron, "XAUTHORITY", envname ); systemEnviron = setEnv( systemEnviron, "XAUTHORITY", envname ); } /* a chown() used to be here, but this code runs as user anyway */ } Debug( "done SetUserAuthorization\n" ); } void RemoveUserAuthorization( struct display *d ) { Xauth **auths; FILE *old, *new; int i; char name[NBSIZE], new_name[NBSIZE + 2]; if (!(auths = d->authorizations)) return; Debug( "RemoveUserAuthorization\n" ); startUserAuth( name, new_name, &old, &new ); if (new) { for (i = 0; i < d->authNum; i++) { if ((d->displayType & d_location) == dLocal) writeLocalAuth( new, auths[i], d->name, 0 ); #ifdef XDMCP else writeRemoteAuth( new, auths[i], (XdmcpNetaddr)d->peer.data, d->peer.length, d->name, 0 ); #endif } if (endUserAuth( old, new, new_name, TRUE )) (void)moveUserAuth( name, new_name, 0 ); else undoUserAuth( name, new_name ); } Debug( "done RemoveUserAuthorization\n" ); }