Logo Search packages:      
Sourcecode: xdm version File versions  Download package

auth.c

/* $XdotOrg: app/xdm/auth.c,v 1.5 2005/11/08 06:33:31 jkj Exp $ */
/* $Xorg: auth.c,v 1.5 2001/02/09 02:05:40 xorgcvs Exp $ */
/*

Copyright 1988, 1998  The Open Group

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 OPEN GROUP 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 The Open Group 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 Open Group.

*/
/* $XFree86: xc/programs/xdm/auth.c,v 3.32 2003/12/22 17:48:12 tsi Exp $ */

/*
 * xdm - display manager daemon
 * Author:  Keith Packard, MIT X Consortium
 *
 * auth.c
 *
 * maintain the authorization generation daemon
 */

#include <X11/X.h>
#include <X11/Xlibint.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "dm.h"
#include "dm_auth.h"
#include "dm_error.h"

#include <errno.h>

#include <sys/ioctl.h>

#if defined(TCPCONN) || defined(STREAMSCONN)
# include "dm_socket.h"
#endif
#ifdef DNETCONN
# include <netdnet/dn.h>
# include <netdnet/dnetdb.h>
#endif

#if defined(hpux)
#include <sys/utsname.h>
#endif

#if defined(SYSV) && defined(i386)
# include <sys/stream.h>
# ifdef ISC
#  include <stropts.h>
#  include <sys/sioctl.h>
# endif /* ISC */
#endif /* i386 */

#ifdef SVR4
# include <netdb.h>
# include <sys/sockio.h>
# include <sys/stropts.h>
#endif
#ifdef __convex__
# include <sync/queue.h>
# include <sync/sema.h>
#endif
#ifdef __GNU__
#include <netdb.h>
#undef SIOCGIFCONF
#else /* __GNU__ */
#include <net/if.h>
#endif /* __GNU__ */

#if defined(TCPCONN) && !defined(WIN32)
# include <netinet/in.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

#if ((defined(SVR4) && !defined(sun)) || defined(ISC)) && \
    defined(SIOCGIFCONF) && !defined(USE_SIOCGLIFCONF)
#define SYSV_SIOCGIFCONF
#endif

#ifdef CSRG_BASED
#include <sys/param.h>
#if (BSD >= 199103)
#define VARIABLE_IFREQ
#endif
#endif

#ifdef __UNIXOS2__
#define link rename
int chown(int a,int b,int c) {}
#include <io.h>
#endif

struct AuthProtocol {
    unsigned short  name_length;
    char        *name;
    void        (*InitAuth)(unsigned short len, char *name);
    Xauth       *(*GetAuth)(unsigned short len, char *name);
    void        (*GetXdmcpAuth)(
                  struct protoDisplay     *pdpy,
                  unsigned short    authorizationNameLen,
                  char        *authorizationName);
    int               inited;
};

static struct AuthProtocol AuthProtocols[] = {
{ (unsigned short) 18,  "MIT-MAGIC-COOKIE-1",
    MitInitAuth, MitGetAuth, NULL
},
#ifdef HASXDMAUTH
{ (unsigned short) 19,  "XDM-AUTHORIZATION-1",
    XdmInitAuth, XdmGetAuth, XdmGetXdmcpAuth,
},
#endif
#ifdef SECURE_RPC
{ (unsigned short) 9, "SUN-DES-1",
    SecureRPCInitAuth, SecureRPCGetAuth, NULL,
},
#endif
#ifdef K5AUTH
{ (unsigned short) 14, "MIT-KERBEROS-5",
    Krb5InitAuth, Krb5GetAuth, NULL,
},
#endif
};

#define NUM_AUTHORIZATION (sizeof (AuthProtocols) / sizeof (AuthProtocols[0]))

static struct AuthProtocol *
findProtocol (unsigned short name_length, char *name)
{
    int     i;

    for (i = 0; i < NUM_AUTHORIZATION; 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, char *name)
{
    if (findProtocol (name_length, name))
      return TRUE;
    return FALSE;
}

static Xauth *
GenerateAuthorization (unsigned short name_length, char *name)
{
    struct AuthProtocol *a;
    Xauth   *auth = 0;
    int         i;

    Debug ("GenerateAuthorization %*.*s\n",
          name_length, name_length, name);
    a = findProtocol (name_length, name);
    if (a)
    {
      if (!a->inited)
      {
          (*a->InitAuth) (name_length, name);
          a->inited = TRUE;
      }
      auth = (*a->GetAuth) (name_length, name);
      if (auth)
      {
          Debug ("Got %p (%d %*.*s) ", auth,
            auth->name_length, auth->name_length,
            auth->name_length, auth->name);
          for (i = 0; i < (int)auth->data_length; i++)
            Debug (" %02x", auth->data[i] & 0xff);
          Debug ("\n");
      }
      else
          Debug ("Got (null)\n");
    }
    else
    {
      Debug ("Unknown authorization %*.*s\n", name_length, name_length, name);
    }
    return auth;
}

#ifdef XDMCP

void
SetProtoDisplayAuthorization (
    struct protoDisplay *pdpy,
    unsigned short      authorizationNameLen,
    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_length, auth->name);
      else
          Debug ("Got (null)\n");
    }
}

#endif /* XDMCP */

void
CleanUpFileName (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 char authdir1[] = "authdir";
static char authdir2[] = "authfiles";

static int
MakeServerAuthFile (struct display *d, FILE ** file)
{
    int len;
#if defined(SYSV) && !defined(SVR4)
#define NAMELEN   14
#else
#define NAMELEN   255
#endif
    char    cleanname[NAMELEN];
    int r;
#ifdef HAS_MKSTEMP
    int fd;
#endif
    struct stat   statb;

    *file = NULL;

    if (!d->authFile) {
      if (d->clientAuthFile && *d->clientAuthFile)
          len = strlen (d->clientAuthFile) + 1;
      else
      {
          CleanUpFileName (d->name, cleanname, NAMELEN - 8);
          len = strlen (authDir) + strlen (authdir1) + strlen (authdir2)
            + strlen (cleanname) + 14;
      }
      d->authFile = malloc (len);
      if (!d->authFile)
          return FALSE;
      if (d->clientAuthFile && *d->clientAuthFile)
          strcpy (d->authFile, d->clientAuthFile);
      else
      {
          sprintf (d->authFile, "%s/%s", authDir, authdir1);
          r = stat(d->authFile, &statb);
          if (r == 0) {
            if (statb.st_uid != 0)
                (void) chown(d->authFile, 0, statb.st_gid);
            if ((statb.st_mode & 0077) != 0)
                (void) chmod(d->authFile, statb.st_mode & 0700);
          } else {
            if (errno == ENOENT)
                r = mkdir(d->authFile, 0700);
            if (r < 0) {
                free (d->authFile);
                d->authFile = NULL;
                return FALSE;
            }
          }
          sprintf (d->authFile, "%s/%s/%s", authDir, authdir1, authdir2);
          r = mkdir(d->authFile, 0700);
          if (r < 0  &&  errno != EEXIST) {
            free (d->authFile);
            d->authFile = NULL;
            return FALSE;
          }
          sprintf (d->authFile, "%s/%s/%s/A%s-XXXXXX",
                 authDir, authdir1, authdir2, cleanname);
#ifdef HAS_MKSTEMP
          fd = mkstemp (d->authFile);
          if (fd < 0) {
            free (d->authFile);
            d->authFile = NULL;
            return FALSE;
          }

          *file = fdopen(fd, "w");
          if (!*file)
            (void) close (fd);
          return TRUE;
#else
          (void) mktemp (d->authFile);
#endif
      }
    }

    (void) unlink (d->authFile);
    *file = fopen (d->authFile, "w");
    return TRUE;
}

int
SaveServerAuthorizations (
    struct display  *d,
    Xauth       **auths,
    int               count)
{
    FILE    *auth_file;
    int           mask;
    int           ret;
    int           i;

    mask = umask (0077);
    ret = MakeServerAuthFile(d, &auth_file);
    umask (mask);
    if (!ret)
      return FALSE;
    if (!auth_file) {
      Debug ("Can't creat auth file %s\n", d->authFile);
      LogError ("Cannot open server authorization file %s\n", d->authFile);
      free (d->authFile);
      d->authFile = NULL;
      ret = FALSE;
    }
    else
    {
      Debug ("File: %s auth: %p\n", d->authFile, auths);
      ret = TRUE;
      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)
            {
                LogError ("Cannot write server authorization file %s\n",
                        d->authFile);
                ret = FALSE;
                free (d->authFile);
                d->authFile = NULL;
            }
      }
      fclose (auth_file);
    }
    return ret;
}

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;
    }
    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 (char *name, char *new_name, FILE **oldp, FILE **newp)
{
      int   mask;

      strcpy (new_name, name);
      strcat (new_name, "-n");
      mask = umask (0077);
      (void) unlink (new_name);
      *newp = fopen (new_name, "w");
      (void) umask (mask);
      if (!*newp) {
            Debug ("can't open new file %s\n", new_name);
            return 0;
      }
      if (!*oldp)
          *oldp = fopen (name, "r");
      Debug ("opens succeeded %s %s\n", name, new_name);
      return 1;
}

static int
binaryEqual (char *a, char *b, unsigned short len)
{
      while (len-- > 0)
            if (*a++ != *b++)
                  return FALSE;
      return TRUE;
}

static void
dumpBytes (unsigned short len, char *data)
{
      unsigned short    i;

      Debug ("%d: ", len);
      for (i = 0; i < len; i++)
            Debug ("%02x ", data[i] & 0377);
      Debug ("\n");
}

static void
dumpAuth (Xauth *auth)
{
      Debug ("family: %d\n", auth->family);
      Debug ("addr:   ");
      dumpBytes (auth->address_length, auth->address);
      Debug ("number: ");
      dumpBytes (auth->number_length, auth->number);
      Debug ("name:   ");
      dumpBytes (auth->name_length, auth->name);
      Debug ("data:   ");
      dumpBytes (auth->data_length, auth->data);
}

struct addrList {
      unsigned short    family;
      unsigned short    address_length;
      char  *address;
      unsigned short    number_length;
      char  *number;
      unsigned short    name_length;
      char  *name;
      struct addrList   *next;
};

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;
            if (a->address)
                  free (a->address);
            if (a->number)
                  free (a->number);
            free ((char *) a);
      }
}

static int checkEntry (Xauth *auth);

static void
saveEntry (Xauth *auth)
{
      struct addrList   *new;

      new = (struct addrList *) malloc (sizeof (struct addrList));
      if (!new) {
            LogOutOfMem ("saveEntry");
            return;
      }
      if ((new->address_length = auth->address_length) > 0) {
            new->address = malloc (auth->address_length);
            if (!new->address) {
                  LogOutOfMem ("saveEntry");
                  free ((char *) new);
                  return;
            }
            memmove( new->address, auth->address, (int) auth->address_length);
      } else
            new->address = 0;
      if ((new->number_length = auth->number_length) > 0) {
            new->number = malloc (auth->number_length);
            if (!new->number) {
                  LogOutOfMem ("saveEntry");
                  free (new->address);
                  free ((char *) new);
                  return;
            }
            memmove( new->number, auth->number, (int) auth->number_length);
      } else
            new->number = 0;
      if ((new->name_length = auth->name_length) > 0) {
            new->name = malloc (auth->name_length);
            if (!new->name) {
                  LogOutOfMem ("saveEntry");
                  free (new->number);
                  free (new->address);
                  free ((char *) new);
                  return;
            }
            memmove( new->name, auth->name, (int) auth->name_length);
      } else
            new->name = 0;
      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 &&
                binaryEqual (a->address, auth->address, auth->address_length) &&
                a->number_length == auth->number_length &&
                binaryEqual (a->number, auth->number, auth->number_length) &&
                a->name_length == auth->name_length &&
                binaryEqual (a->name, auth->name, auth->name_length))
            {
                  return 1;
            }
      }
      return 0;
}

static int  doWrite;

static void
writeAuth (FILE *file, Xauth *auth)
{
    if (debugLevel >= 15) {   /* normally too verbose */
        Debug ("writeAuth: doWrite = %d\n", doWrite);
      dumpAuth (auth);  /* does Debug only */
    }
      if (doWrite)
          XauWriteAuth (file, auth);
}

static void
writeAddr (
    int           family,
    int           addr_length,
    char    *addr,
    FILE    *file,
    Xauth   *auth)
{
      auth->family = (unsigned short) family;
      auth->address_length = addr_length;
      auth->address = addr;
      Debug ("writeAddr: writing and saving an entry\n");
      writeAuth (file, auth);
      saveEntry (auth);
}

static void
DefineLocal (FILE *file, Xauth *auth)
{
      char  displayname[100];
      int   len = _XGetHostname (displayname, sizeof(displayname));

/* 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).
 */

#if defined(hpux)
      /*
       * 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().
       */
      char  tmp_displayname[100];
      struct utsname name;
 
      tmp_displayname[0] = 0;
      uname(&name);
      snprintf(tmp_displayname, sizeof(tmp_displayname), "%s", name.nodename);
      writeAddr (FamilyLocal, strlen (tmp_displayname), tmp_displayname,
                     file, auth);
 
      /*
       * If _XGetHostname() returned the same value as uname(), don't 
       * write a duplicate entry.
       */
      if (strcmp (displayname, tmp_displayname))
#endif

      writeAddr (FamilyLocal, len, displayname, file, auth);
}

#ifdef HAS_GETIFADDRS
#include <ifaddrs.h>

static void
DefineSelf(int fd, FILE *file, Xauth *auth)
{
    struct ifaddrs *ifap, *ifr;
    char *addr;
    int family, len;
    
    Debug("DefineSelf\n");
    if (getifaddrs(&ifap) < 0) 
      return;
    for (ifr = ifap; ifr != NULL; ifr = ifr->ifa_next) {
      len = sizeof(*(ifr->ifa_addr));
      family = ConvertAddr((XdmcpNetaddr)(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 && len == 4 &&
          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 && 
            strcmp(auth->name, "XDM-AUTHORIZATION-1") == 0) {
            Debug ("Skipping IPv6 XDM-AUTHORIZATION-1\n");
            continue;
          }
      }
#endif
      writeAddr(family, len, addr, file, auth);
    } 
    Debug("DefineSelf done\n");
}
#else  /* GETIFADDRS */

#ifdef SYSV_SIOCGIFCONF

/* Deal with different SIOCGIFCONF ioctl semantics on SYSV, SVR4 */

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 /* SYSV_SIOCGIFCONF */
#define ifioctl ioctl
#endif /* SYSV_SIOCGIFCONF */

#if defined(STREAMSCONN) && !defined(SYSV_SIOCGIFCONF) && !defined(NCR)

#include <tiuser.h>

/* 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)
{
    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);
}

#else

#ifdef WINTCP /* NCR with Wollongong 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>

static void
DefineSelf (int fd, FILE *file, Xauth *auth)
{
    /*
     * 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 ("Getting interface configuration");

    /* 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 ("Getting interface configuration");
      }

      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 ("Getting interface configuration");
      }

      /*
       * 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);
 
    }
    close(ipfd);
}

#else /* WINTCP */

#if defined(SIOCGIFCONF) || defined (USE_SIOCGLIFCONF)

#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

/* 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)
{
    char          buf[2048], *cp, *cplim;
    int           len;
    char          *addr;
    int           family;
    register 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");
    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;

#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    
    ifc.ifc_len = sizeof (buf);
    ifc.ifc_buf = buf;

#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
#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, (char *) &ifc) < 0) {
        LogError ("Trouble getting network interface configuration");

#ifdef USE_SIOCGLIFCONF
      if (bufptr != buf) {
          free(bufptr);
      }
#endif
      return;
    }

    cplim = (char *) IFC_IFC_REQ + IFC_IFC_LEN;

    for (cp = (char *) IFC_IFC_REQ; 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_IFR_ADDR.sa_family == AF_DECnet) {
            len = sizeof (struct dn_naddr);
            addr = (char *)ifr->ifr_addr.sa_data;
            family = FamilyDECnet;
      } else
#endif
      {
          family = ConvertAddr ((XdmcpNetaddr) &IFR_IFR_ADDR, &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 && len == 4 &&
            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 && 
                strcmp(auth->name, "XDM-AUTHORIZATION-1") == 0) {
                Debug ("Skipping IPv6 XDM-AUTHORIZATION-1\n");
                continue;
            }
          }
#endif
      }
      Debug ("DefineSelf: write network address, length %d\n", len);
      writeAddr (family, len, addr, file, auth);
    }
}

#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)
{
    register int n;
    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);
    hp = gethostbyname (name.nodename);
    if (hp != NULL) {
      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);
      family = ConvertAddr ( &(saddr.sa), &len, &addr);
      if ( family >= 0) {
          writeAddr (FamilyInternet, sizeof (inetaddr->sin_addr),
                  (char *) (&inetaddr->sin_addr), file, auth);
      }
    }
}

             
#endif /* SIOCGIFCONF else */
#endif /* WINTCP else */
#endif /* STREAMSCONN && !SYSV_SIOCGIFCONF else */
#endif /* HAS_GETIFADDRS */

static void
setAuthNumber (Xauth *auth, char *name)
{
    char    *colon;
    char    *dot, *number;

    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);
      number = malloc (auth->number_length + 1);
      if (number) {
          strncpy (number, colon, auth->number_length);
          number[auth->number_length] = '\0';
      } else {
          LogOutOfMem ("setAuthNumber");
          auth->number_length = 0;
      }
      auth->number = number;
      Debug ("setAuthNumber: %s\n", number);
    }
}

static void
writeLocalAuth (FILE *file, Xauth *auth, char *name)
{
    int     fd;

    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);
    t_unbind (fd);
    t_close (fd);
#endif
#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);
    close (fd);
#endif
#ifdef DNETCONN
    fd = socket (AF_DECnet, SOCK_STREAM, 0);
    DefineSelf (fd, file, auth);
    close (fd);
#endif
    DefineLocal (file, auth);
}

#ifdef XDMCP

static void
writeRemoteAuth (FILE *file, Xauth *auth, XdmcpNetaddr peer, int peerlen, char *name)
{
    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 = ConvertAddr (peer, &peerlen, &addr);
    Debug ("writeRemoteAuth: family %d\n", family);
    if (family != FamilyLocal)
    {
      Debug ("writeRemoteAuth: %d, %d, %x\n",
            family, peerlen, *(int *)addr);
      writeAddr (family, peerlen, addr, file, auth);
    }
    else
    {
      writeLocalAuth (file, auth, name);
    }
}

#endif /* XDMCP */

void
SetUserAuthorization (struct display *d, struct verify_info *verify)
{
    FILE    *old = NULL, *new;
    char    home_name[1024], backup_name[1024], new_name[1024];
    char    *name = 0;
    char    *home;
    char    *envname = 0;
    int     lockStatus;
    Xauth   *entry, **auths;
    int           setenv = 0;
    struct stat   statb;
    int           i;
    int           magicCookie;
    int           data_len;
#ifdef HAS_MKSTEMP
    int           fd;
#endif

    Debug ("SetUserAuthorization\n");
    auths = d->authorizations;
    if (auths) {
      home = getEnv (verify->userEnviron, "HOME");
      lockStatus = LOCK_ERROR;
      if (home) {
          snprintf (home_name, sizeof(home_name), "%s/.Xauthority", home);
          Debug ("XauLockAuth %s\n", home_name);
          lockStatus = XauLockAuth (home_name, 1, 2, 10);
          Debug ("Lock is %d\n", lockStatus);
          if (lockStatus == LOCK_SUCCESS) {
            if (openFiles (home_name, new_name, &old, &new)
                && (old != NULL) && (new != NULL)) {
                name = home_name;
                setenv = 0;
            } else {
                Debug ("openFiles failed\n");
                XauUnlockAuth (home_name);
                lockStatus = LOCK_ERROR;
                if (old != NULL) {
                  (void) fclose (old);
                  old = NULL;
                }
                if (new != NULL)
                  (void) fclose (new);
            }     
          }
      }
      if (lockStatus != LOCK_SUCCESS) {
          snprintf (backup_name, sizeof(backup_name),
                  "%s/.XauthXXXXXX", d->userAuthDir);
#ifdef HAS_MKSTEMP
          fd = mkstemp (backup_name);
          if (fd >= 0) {
            old = fdopen (fd, "r");
            if (old == NULL)
                (void) close(fd);
          }

          if (old != NULL)
#else
          (void) mktemp (backup_name);
#endif
          {
            lockStatus = XauLockAuth (backup_name, 1, 2, 10);
            Debug ("backup lock is %d\n", lockStatus);
            if (lockStatus == LOCK_SUCCESS) {
                if (openFiles (backup_name, new_name, &old, &new)
                  && (old != NULL) && (new != NULL)) {
                  name = backup_name;
                  setenv = 1;
                } else {
                  XauUnlockAuth (backup_name);
                  lockStatus = LOCK_ERROR;
                  if (old != NULL) {
                      (void) fclose (old);
                      old = NULL;
                  }
                  if (new != NULL)
                      (void) fclose (new);
                }
#ifdef HAS_MKSTEMP
            } else {
                (void) fclose (old);
#endif
            }
          }
      }
      if (lockStatus != LOCK_SUCCESS) {
          Debug ("can't lock auth file %s or backup %s\n",
                      home_name, backup_name);
          LogError ("can't lock authorization file %s or backup %s\n",
                      home_name, backup_name);
          return;
      }
      initAddrs ();
      doWrite = 1;
      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 &&
            !strncmp (auths[i]->name, "MIT-MAGIC-COOKIE-1", 18))
          {
            magicCookie = i;
            if (d->displayType.location == Local)
                writeLocalAuth (new, auths[i], d->name);
#ifdef XDMCP
            else
                writeRemoteAuth (new, auths[i], d->peer, d->peerlen, d->name);
#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.location == Local)
                writeLocalAuth (new, auths[i], d->name);
#ifdef XDMCP
            else
                writeRemoteAuth (new, auths[i], d->peer, d->peerlen, d->name);
#endif
            auths[i]->data_length = data_len;
          }
      }
      if (old) {
          if (fstat (fileno (old), &statb) != -1)
            chmod (new_name, (int) (statb.st_mode & 0777));
          /*SUPPRESS 560*/
          while ((entry = XauReadAuth (old))) {
            if (!checkEntry (entry))
            {
                Debug ("Writing an entry\n");
                writeAuth (new, entry);
            }
            XauDisposeAuth (entry);
          }
          fclose (old);
      }
      doneAddrs ();
      fclose (new);
      if (unlink (name) == -1)
          Debug ("unlink %s failed\n", name);
      envname = name;
      if (link (new_name, name) == -1) {
          Debug ("link failed %s %s\n", new_name, name);
          LogError ("Can't move authorization into place\n");
          setenv = 1;
          envname = new_name;
      } else {
          Debug ("new is in place, go for it!\n");
          unlink (new_name);
      }
      if (setenv) {
          verify->userEnviron = setEnv (verify->userEnviron,
                            "XAUTHORITY", envname);
          verify->systemEnviron = setEnv (verify->systemEnviron,
                            "XAUTHORITY", envname);
      }
      XauUnlockAuth (name);
      if (envname)
          chown (envname, verify->uid, verify->gid);
    }
    Debug ("done SetUserAuthorization\n");
}

void
RemoveUserAuthorization (struct display *d, struct verify_info *verify)
{
    char    *home;
    Xauth   **auths, *entry;
    char    name[1024], new_name[1024];
    int         lockStatus;
    FILE    *old, *new;
    struct stat   statb;
    int         i;

    if (!(auths = d->authorizations))
      return;
    home = getEnv (verify->userEnviron, "HOME");
    if (!home)
      return;
    Debug ("RemoveUserAuthorization\n");
    snprintf(name, sizeof(name), "%s/.Xauthority", home);
    Debug ("XauLockAuth %s\n", name);
    lockStatus = XauLockAuth (name, 1, 2, 10);
    Debug ("Lock is %d\n", lockStatus);
    if (lockStatus != LOCK_SUCCESS)
      return;
    old = NULL;
    if (openFiles (name, new_name, &old, &new))
    {
      initAddrs ();
      doWrite = 0;
      for (i = 0; i < d->authNum; i++)
      {
          if (d->displayType.location == Local)
            writeLocalAuth (new, auths[i], d->name);
#ifdef XDMCP
          else
            writeRemoteAuth (new, auths[i], d->peer, d->peerlen, d->name);
#endif
      }
      doWrite = 1;
      if (old) {
          if (fstat (fileno (old), &statb) != -1)
            chmod (new_name, (int) (statb.st_mode & 0777));
          /*SUPPRESS 560*/
          while ((entry = XauReadAuth (old))) {
            if (!checkEntry (entry))
            {
                Debug ("Writing an entry\n");
                writeAuth (new, entry);
            }
            XauDisposeAuth (entry);
          }
          fclose (old);
      }
      doneAddrs ();
      fclose (new);
      if (unlink (name) == -1)
          Debug ("unlink %s failed\n", name);
      if (link (new_name, name) == -1) {
          Debug ("link failed %s %s\n", new_name, name);
          LogError ("Can't move authorization into place\n");
      } else {
          Debug ("new is in place, go for it!\n");
          unlink (new_name);
      }
    }
    XauUnlockAuth (name);
}

Generated by  Doxygen 1.6.0   Back to index