os/mitauth.c

   1 /*
   2
   3 Copyright 1988, 1998  The Open Group
   4
   5 Permission to use, copy, modify, distribute, and sell this software and its
   6 documentation for any purpose is hereby granted without fee, provided that
   7 the above copyright notice appear in all copies and that both that
   8 copyright notice and this permission notice appear in supporting
   9 documentation.
  10
  11 The above copyright notice and this permission notice shall be included
  12 in all copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  17 IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 OTHER DEALINGS IN THE SOFTWARE.
  21
  22 Except as contained in this notice, the name of The Open Group shall
  23 not be used in advertising or otherwise to promote the sale, use or
  24 other dealings in this Software without prior written authorization
  25 from The Open Group.
  26
  27 */
  28
  29 /*
  30  * MIT-MAGIC-COOKIE-1 authorization scheme
  31  * Author:  Keith Packard, MIT X Consortium
  32  */
  33
  34 #ifdef HAVE_DIX_CONFIG_H
  35 #include <dix-config.h>
  36 #endif
  37
  38 #include <X11/X.h>
  39 #include "os.h"
  40 #include "osdep.h"
  41 #include "dixstruct.h"
  42
  43 static struct auth {
  44     struct auth *next;
  45     unsigned short len;
  46     char *data;
  47     XID id;
  48 } *mit_auth;
  49
  50 int
  51 MitAddCookie(unsigned short data_length, const char *data, XID id)
  52 {
  53     struct auth *new;
  54
  55     new = malloc(sizeof(struct auth));
  56     if (!new)
  57         return 0;
  58     new->data = malloc((unsigned) data_length);
  59     if (!new->data) {
  60         free(new);
  61         return 0;
  62     }
  63     new->next = mit_auth;
  64     mit_auth = new;
  65     memmove(new->data, data, (int) data_length);
  66     new->len = data_length;
  67     new->id = id;
  68     return 1;
  69 }
  70
  71 XID
  72 MitCheckCookie(unsigned short data_length,
  73                const char *data, ClientPtr client, const char **reason)
  74 {
  75     struct auth *auth;
  76
  77     for (auth = mit_auth; auth; auth = auth->next) {
  78         if (data_length == auth->len &&
  79             memcmp(data, auth->data, (int) data_length) == 0)
  80             return auth->id;
  81     }
  82     *reason = "Invalid MIT-MAGIC-COOKIE-1 key";
  83     return (XID) -1;
  84 }
  85
  86 int
  87 MitResetCookie(void)
  88 {
  89     struct auth *auth, *next;
  90
  91     for (auth = mit_auth; auth; auth = next) {
  92         next = auth->next;
  93         free(auth->data);
  94         free(auth);
  95     }
  96     mit_auth = 0;
  97     return 0;
  98 }
  99
 100 XID
 101 MitToID(unsigned short data_length, char *data)
 102 {
 103     struct auth *auth;
 104
 105     for (auth = mit_auth; auth; auth = auth->next) {
 106         if (data_length == auth->len &&
 107             memcmp(data, auth->data, data_length) == 0)
 108             return auth->id;
 109     }
 110     return (XID) -1;
 111 }
 112
 113 int
 114 MitFromID(XID id, unsigned short *data_lenp, char **datap)
 115 {
 116     struct auth *auth;
 117
 118     for (auth = mit_auth; auth; auth = auth->next) {
 119         if (id == auth->id) {
 120             *data_lenp = auth->len;
 121             *datap = auth->data;
 122             return 1;
 123         }
 124     }
 125     return 0;
 126 }
 127
 128 int
 129 MitRemoveCookie(unsigned short data_length, const char *data)
 130 {
 131     struct auth *auth, *prev;
 132
 133     prev = 0;
 134     for (auth = mit_auth; auth; prev = auth, auth = auth->next) {
 135         if (data_length == auth->len &&
 136             memcmp(data, auth->data, data_length) == 0) {
 137             if (prev)
 138                 prev->next = auth->next;
 139             else
 140                 mit_auth = auth->next;
 141             free(auth->data);
 142             free(auth);
 143             return 1;
 144         }
 145     }
 146     return 0;
 147 }
 148
 149 #ifdef XCSECURITY
 150
 151 static char cookie[16];         /* 128 bits */
 152
 153 XID
 154 MitGenerateCookie(unsigned data_length,
 155                   const char *data,
 156                   XID id, unsigned *data_length_return, char **data_return)
 157 {
 158     int i = 0;
 159     int status;
 160
 161     while (data_length--) {
 162         cookie[i++] += *data++;
 163         if (i >= sizeof(cookie))
 164             i = 0;
 165     }
 166     GenerateRandomData(sizeof(cookie), cookie);
 167     status = MitAddCookie(sizeof(cookie), cookie, id);
 168     if (!status) {
 169         id = -1;
 170     }
 171     else {
 172         *data_return = cookie;
 173         *data_length_return = sizeof(cookie);
 174     }
 175     return id;
 176 }
 177
 178 #endif                          /* XCSECURITY */