xserver

xserver with xephyr scale patch
git clone https://git.neptards.moe/u3shit/xserver.git
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mitauth.c (3972B)

      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             timingsafe_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 int
    101 MitFromID(XID id, unsigned short *data_lenp, char **datap)
    102 {
    103     struct auth *auth;
    104 
    105     for (auth = mit_auth; auth; auth = auth->next) {
    106         if (id == auth->id) {
    107             *data_lenp = auth->len;
    108             *datap = auth->data;
    109             return 1;
    110         }
    111     }
    112     return 0;
    113 }
    114 
    115 int
    116 MitRemoveCookie(unsigned short data_length, const char *data)
    117 {
    118     struct auth *auth, *prev;
    119 
    120     prev = 0;
    121     for (auth = mit_auth; auth; prev = auth, auth = auth->next) {
    122         if (data_length == auth->len &&
    123             memcmp(data, auth->data, data_length) == 0) {
    124             if (prev)
    125                 prev->next = auth->next;
    126             else
    127                 mit_auth = auth->next;
    128             free(auth->data);
    129             free(auth);
    130             return 1;
    131         }
    132     }
    133     return 0;
    134 }
    135 
    136 static char cookie[16];         /* 128 bits */
    137 
    138 XID
    139 MitGenerateCookie(unsigned data_length,
    140                   const char *data,
    141                   XID id, unsigned *data_length_return, char **data_return)
    142 {
    143     int i = 0;
    144     int status;
    145 
    146     while (data_length--) {
    147         cookie[i++] += *data++;
    148         if (i >= sizeof(cookie))
    149             i = 0;
    150     }
    151     GenerateRandomData(sizeof(cookie), cookie);
    152     status = MitAddCookie(sizeof(cookie), cookie, id);
    153     if (!status) {
    154         id = -1;
    155     }
    156     else {
    157         *data_return = cookie;
    158         *data_length_return = sizeof(cookie);
    159     }
    160     return id;
    161 }