IABSD.fr/xenocara/xserver/os/mitauth.c

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• Author : matthieu
  Date : 2019-07-27 07:57:06
  Hash : a77e9959
  Message : Update to xserver 1.20.5. Tested by jsg@

• xserver/os/mitauth.c

• /*
  
  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.
  
  */
  
  /*
   * MIT-MAGIC-COOKIE-1 authorization scheme
   * Author:  Keith Packard, MIT X Consortium
   */
  
  #ifdef HAVE_DIX_CONFIG_H
  #include <dix-config.h>
  #endif
  
  #include <X11/X.h>
  #include "os.h"
  #include "osdep.h"
  #include "dixstruct.h"
  
  static struct auth {
      struct auth *next;
      unsigned short len;
      char *data;
      XID id;
  } *mit_auth;
  
  int
  MitAddCookie(unsigned short data_length, const char *data, XID id)
  {
      struct auth *new;
  
      new = malloc(sizeof(struct auth));
      if (!new)
          return 0;
      new->data = malloc((unsigned) data_length);
      if (!new->data) {
          free(new);
          return 0;
      }
      new->next = mit_auth;
      mit_auth = new;
      memmove(new->data, data, (int) data_length);
      new->len = data_length;
      new->id = id;
      return 1;
  }
  
  XID
  MitCheckCookie(unsigned short data_length,
                 const char *data, ClientPtr client, const char **reason)
  {
      struct auth *auth;
  
      for (auth = mit_auth; auth; auth = auth->next) {
          if (data_length == auth->len &&
              timingsafe_memcmp(data, auth->data, (int) data_length) == 0)
              return auth->id;
      }
      *reason = "Invalid MIT-MAGIC-COOKIE-1 key";
      return (XID) -1;
  }
  
  int
  MitResetCookie(void)
  {
      struct auth *auth, *next;
  
      for (auth = mit_auth; auth; auth = next) {
          next = auth->next;
          free(auth->data);
          free(auth);
      }
      mit_auth = 0;
      return 0;
  }
  
  int
  MitFromID(XID id, unsigned short *data_lenp, char **datap)
  {
      struct auth *auth;
  
      for (auth = mit_auth; auth; auth = auth->next) {
          if (id == auth->id) {
              *data_lenp = auth->len;
              *datap = auth->data;
              return 1;
          }
      }
      return 0;
  }
  
  int
  MitRemoveCookie(unsigned short data_length, const char *data)
  {
      struct auth *auth, *prev;
  
      prev = 0;
      for (auth = mit_auth; auth; prev = auth, auth = auth->next) {
          if (data_length == auth->len &&
              memcmp(data, auth->data, data_length) == 0) {
              if (prev)
                  prev->next = auth->next;
              else
                  mit_auth = auth->next;
              free(auth->data);
              free(auth);
              return 1;
          }
      }
      return 0;
  }
  
  static char cookie[16];         /* 128 bits */
  
  XID
  MitGenerateCookie(unsigned data_length,
                    const char *data,
                    XID id, unsigned *data_length_return, char **data_return)
  {
      int i = 0;
      int status;
  
      while (data_length--) {
          cookie[i++] += *data++;
          if (i >= sizeof(cookie))
              i = 0;
      }
      GenerateRandomData(sizeof(cookie), cookie);
      status = MitAddCookie(sizeof(cookie), cookie, id);
      if (!status) {
          id = -1;
      }
      else {
          *data_return = cookie;
          *data_length_return = sizeof(cookie);
      }
      return id;
  }