464 lines
12 KiB
C
464 lines
12 KiB
C
/*
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Copyright 1988, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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*/
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/*
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* XDM-AUTHENTICATION-1 (XDMCP authentication) and
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* XDM-AUTHORIZATION-1 (client authorization) protocols
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*
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* Author: Keith Packard, MIT X Consortium
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*/
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#include <dix-config.h>
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#include <stdio.h>
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#include <X11/X.h>
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#define XSERV_t
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#define TRANS_SERVER
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#define TRANS_REOPEN
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#include <X11/Xtrans/Xtrans.h>
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#include "os/auth.h"
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#include "os.h"
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#include "osdep.h"
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#include "xdmcp.h"
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#include "xdmauth.h"
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#include "dixstruct.h"
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#ifdef HASXDMAUTH
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static Bool authFromXDMCP;
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#ifdef XDMCP
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#include <X11/Xmd.h>
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#undef REQUEST
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#include <X11/Xdmcp.h>
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/* XDM-AUTHENTICATION-1 */
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static XdmAuthKeyRec privateKey;
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static char XdmAuthenticationName[] = "XDM-AUTHENTICATION-1";
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#define XdmAuthenticationNameLen (sizeof XdmAuthenticationName - 1)
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static XdmAuthKeyRec global_rho;
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static Bool
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XdmAuthenticationValidator(ARRAY8Ptr privateData, ARRAY8Ptr incomingData,
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xdmOpCode packet_type)
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{
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XdmAuthKeyPtr incoming;
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XdmcpUnwrap(incomingData->data, (unsigned char *) &privateKey,
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incomingData->data, incomingData->length);
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if (packet_type == ACCEPT) {
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if (incomingData->length != 8)
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return FALSE;
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incoming = (XdmAuthKeyPtr) incomingData->data;
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XdmcpDecrementKey(incoming);
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return XdmcpCompareKeys(incoming, &global_rho);
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}
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return FALSE;
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}
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static Bool
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XdmAuthenticationGenerator(ARRAY8Ptr privateData, ARRAY8Ptr outgoingData,
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xdmOpCode packet_type)
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{
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outgoingData->length = 0;
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outgoingData->data = 0;
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if (packet_type == REQUEST) {
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if (XdmcpAllocARRAY8(outgoingData, 8))
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XdmcpWrap((unsigned char *) &global_rho, (unsigned char *) &privateKey,
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outgoingData->data, 8);
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}
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return TRUE;
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}
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static Bool
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XdmAuthenticationAddAuth(int name_len, const char *name,
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int data_len, char *data)
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{
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Bool ret;
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XdmcpUnwrap((unsigned char *) data, (unsigned char *) &privateKey,
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(unsigned char *) data, data_len);
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authFromXDMCP = TRUE;
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ret = AddAuthorization(name_len, name, data_len, data);
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authFromXDMCP = FALSE;
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return ret;
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}
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#define atox(c) ('0' <= c && c <= '9' ? c - '0' : \
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'a' <= c && c <= 'f' ? c - 'a' + 10 : \
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'A' <= c && c <= 'F' ? c - 'A' + 10 : -1)
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static int
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HexToBinary(const char *in, char *out, int len)
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{
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int top, bottom;
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while (len > 0) {
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top = atox(in[0]);
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if (top == -1)
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return 0;
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bottom = atox(in[1]);
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if (bottom == -1)
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return 0;
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*out++ = (top << 4) | bottom;
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in += 2;
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len -= 2;
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}
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if (len)
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return 0;
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*out++ = '\0';
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return 1;
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}
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void
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XdmAuthenticationInit(const char *cookie, int cookie_len)
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{
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memset(privateKey.data, 0, 8);
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if (!strncmp(cookie, "0x", 2) || !strncmp(cookie, "0X", 2)) {
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if (cookie_len > 2 + 2 * 8)
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cookie_len = 2 + 2 * 8;
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HexToBinary(cookie + 2, (char *) privateKey.data, cookie_len - 2);
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}
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else {
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if (cookie_len > 7)
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cookie_len = 7;
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memmove(privateKey.data + 1, cookie, cookie_len);
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}
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XdmcpGenerateKey(&global_rho);
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XdmcpRegisterAuthentication(XdmAuthenticationName, XdmAuthenticationNameLen,
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(char *) &global_rho,
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sizeof(global_rho),
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(ValidatorFunc) XdmAuthenticationValidator,
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(GeneratorFunc) XdmAuthenticationGenerator,
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(AddAuthorFunc) XdmAuthenticationAddAuth);
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}
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#endif /* XDMCP */
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/* XDM-AUTHORIZATION-1 */
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typedef struct _XdmAuthorization {
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struct _XdmAuthorization *next;
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XdmAuthKeyRec rho;
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XdmAuthKeyRec key;
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XID id;
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} XdmAuthorizationRec, *XdmAuthorizationPtr;
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static XdmAuthorizationPtr xdmAuth;
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typedef struct _XdmClientAuth {
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struct _XdmClientAuth *next;
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XdmAuthKeyRec rho;
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char client[6];
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long time;
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} XdmClientAuthRec, *XdmClientAuthPtr;
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static XdmClientAuthPtr xdmClients;
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static long clockOffset;
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static Bool gotClock;
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#define TwentyMinutes (20 * 60)
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#define TwentyFiveMinutes (25 * 60)
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static Bool
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XdmClientAuthCompare(const XdmClientAuthPtr a, const XdmClientAuthPtr b)
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{
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int i;
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if (!XdmcpCompareKeys(&a->rho, &b->rho))
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return FALSE;
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for (i = 0; i < 6; i++)
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if (a->client[i] != b->client[i])
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return FALSE;
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return a->time == b->time;
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}
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static void
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XdmClientAuthDecode(const unsigned char *plain, XdmClientAuthPtr auth)
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{
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int i, j;
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j = 0;
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for (i = 0; i < 8; i++) {
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auth->rho.data[i] = plain[j];
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++j;
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}
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for (i = 0; i < 6; i++) {
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auth->client[i] = plain[j];
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++j;
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}
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auth->time = 0;
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for (i = 0; i < 4; i++) {
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auth->time |= plain[j] << ((3 - i) << 3);
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j++;
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}
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}
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static void
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XdmClientAuthTimeout(long now)
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{
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XdmClientAuthPtr client, next, prev;
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prev = 0;
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for (client = xdmClients; client; client = next) {
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next = client->next;
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if (labs(now - client->time) > TwentyFiveMinutes) {
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if (prev)
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prev->next = next;
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else
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xdmClients = next;
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free(client);
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}
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else
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prev = client;
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}
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}
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static XdmClientAuthPtr
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XdmAuthorizationValidate(unsigned char *plain, int length,
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XdmAuthKeyPtr rho, ClientPtr xclient,
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const char **reason)
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{
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XdmClientAuthPtr client, existing;
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long now;
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int i;
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if (length != (192 / 8)) {
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if (reason)
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*reason = "Bad XDM authorization key length";
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return NULL;
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}
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client = malloc(sizeof(XdmClientAuthRec));
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if (!client)
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return NULL;
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XdmClientAuthDecode(plain, client);
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if (!XdmcpCompareKeys(&client->rho, rho)) {
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free(client);
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if (reason)
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*reason = "Invalid XDM-AUTHORIZATION-1 key (failed key comparison)";
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return NULL;
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}
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for (i = 18; i < 24; i++)
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if (plain[i] != 0) {
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free(client);
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if (reason)
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*reason = "Invalid XDM-AUTHORIZATION-1 key (failed NULL check)";
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return NULL;
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}
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if (xclient) {
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int family, addr_len;
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Xtransaddr *addr;
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if (_XSERVTransGetPeerAddr(((OsCommPtr) xclient->osPrivate)->trans_conn,
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&family, &addr_len, &addr) == 0
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&& _XSERVTransConvertAddress(&family, &addr_len, &addr) == 0) {
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#if defined(TCPCONN)
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if (family == FamilyInternet &&
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memcmp((char *) addr, client->client, 4) != 0) {
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free(client);
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free(addr);
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if (reason)
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*reason =
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"Invalid XDM-AUTHORIZATION-1 key (failed address comparison)";
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return NULL;
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}
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#endif
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free(addr);
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}
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}
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now = time(0);
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if (!gotClock) {
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clockOffset = client->time - now;
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gotClock = TRUE;
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}
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now += clockOffset;
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XdmClientAuthTimeout(now);
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if (labs(client->time - now) > TwentyMinutes) {
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free(client);
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if (reason)
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*reason = "Excessive XDM-AUTHORIZATION-1 time offset";
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return NULL;
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}
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for (existing = xdmClients; existing; existing = existing->next) {
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if (XdmClientAuthCompare(existing, client)) {
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free(client);
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if (reason)
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*reason = "XDM authorization key matches an existing client!";
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return NULL;
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}
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}
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return client;
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}
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int
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XdmAddCookie(unsigned short data_length, const char *data, XID id)
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{
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XdmAuthorizationPtr new;
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unsigned char *rho_bits, *key_bits;
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switch (data_length) {
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case 16: /* auth from files is 16 bytes long */
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#ifdef XDMCP
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if (authFromXDMCP) {
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/* R5 xdm sent bogus authorization data in the accept packet,
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* but we can recover */
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rho_bits = global_rho.data;
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key_bits = (unsigned char *) data;
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key_bits[0] = '\0';
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}
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else
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#endif
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{
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rho_bits = (unsigned char *) data;
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key_bits = (unsigned char *) (data + 8);
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}
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break;
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#ifdef XDMCP
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case 8: /* auth from XDMCP is 8 bytes long */
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rho_bits = global_rho.data;
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key_bits = (unsigned char *) data;
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break;
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#endif
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default:
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return 0;
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}
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/* the first octet of the key must be zero */
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if (key_bits[0] != '\0')
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return 0;
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new = malloc(sizeof(XdmAuthorizationRec));
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if (!new)
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return 0;
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new->next = xdmAuth;
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xdmAuth = new;
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memcpy(new->key.data, key_bits, 8);
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memcpy(new->rho.data, rho_bits, 8);
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new->id = id;
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return 1;
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}
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XID
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XdmCheckCookie(unsigned short cookie_length, const char *cookie,
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ClientPtr xclient, const char **reason)
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{
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XdmAuthorizationPtr auth;
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XdmClientAuthPtr client;
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unsigned char *plain;
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/* Auth packets must be a multiple of 8 bytes long */
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if (cookie_length & 7)
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return (XID) -1;
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plain = malloc(cookie_length);
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if (!plain)
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return (XID) -1;
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for (auth = xdmAuth; auth; auth = auth->next) {
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XdmcpUnwrap((unsigned char *) cookie, (unsigned char *) &auth->key,
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plain, cookie_length);
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if ((client =
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XdmAuthorizationValidate(plain, cookie_length, &auth->rho, xclient,
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reason)) != NULL) {
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client->next = xdmClients;
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xdmClients = client;
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free(plain);
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return auth->id;
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}
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}
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free(plain);
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return (XID) -1;
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}
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int
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XdmResetCookie(void)
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{
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XdmAuthorizationPtr auth, next_auth;
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XdmClientAuthPtr client, next_client;
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for (auth = xdmAuth; auth; auth = next_auth) {
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next_auth = auth->next;
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free(auth);
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}
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xdmAuth = 0;
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for (client = xdmClients; client; client = next_client) {
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next_client = client->next;
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free(client);
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}
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xdmClients = (XdmClientAuthPtr) 0;
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return 1;
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}
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int
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XdmFromID(XID id, unsigned short *data_lenp, char **datap)
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{
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XdmAuthorizationPtr auth;
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for (auth = xdmAuth; auth; auth = auth->next) {
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if (id == auth->id) {
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*data_lenp = 16;
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*datap = (char *) &auth->rho;
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return 1;
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}
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}
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return 0;
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}
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int
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XdmRemoveCookie(unsigned short data_length, const char *data)
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{
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XdmAuthorizationPtr auth;
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XdmAuthKeyPtr key_bits, rho_bits;
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switch (data_length) {
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case 16:
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rho_bits = (XdmAuthKeyPtr) data;
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key_bits = (XdmAuthKeyPtr) (data + 8);
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break;
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#ifdef XDMCP
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case 8:
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rho_bits = &global_rho;
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key_bits = (XdmAuthKeyPtr) data;
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break;
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#endif
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default:
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return 0;
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}
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for (auth = xdmAuth; auth; auth = auth->next) {
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if (XdmcpCompareKeys(rho_bits, &auth->rho) &&
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XdmcpCompareKeys(key_bits, &auth->key)) {
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xdmAuth = auth->next;
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free(auth);
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return 1;
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}
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}
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return 0;
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}
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#endif
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