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/* This file is part of the Project Athena Zephyr Notification System.
* It contains functions for dealing with acl's.
*
* Created by: John T. Kohl
*
* $Id: access.c 2527 2009-08-09 18:42:32Z kcr@ATHENA.MIT.EDU $
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include <zephyr/mit-copyright.h>
#include "zserver.h"
#if !defined (lint) && !defined (SABER)
static const char rcsid_access_c[] =
"$Id: access.c 2527 2009-08-09 18:42:32Z kcr@ATHENA.MIT.EDU $";
#endif
/*
*
* External routines:
*
* int access_check(notice, acl, accesstype)
* ZNotice_t *notice;
* Acl *acl;
* Access accesstype;
*
* void access_init();
*
* void access_reinit();
*/
/*
* Each restricted class has four ACL's associated with it,
* governing subscriptions, transmission, and instance restrictions.
* This module provides the 'glue' between the standard Athena ACL
* routines and the support needed by the Zephyr server.
*/
/*
* Our private types for the acl_types field in the Acl structure.
* -TYT 8/14/90
*/
#define ACL_XMT 1
#define ACL_SUB 2
#define ACL_IWS 4
#define ACL_IUI 8
static void check_acl(Acl *acl);
static void check_acl_type(Acl *acl, Access accesstype, int typeflag);
static void access_setup(int first);
/*
* check access. return 1 if ok, 0 if not ok.
*/
int
access_check(char *sender,
Acl *acl,
Access accesstype)
{
char buf[MAXPATHLEN]; /* holds the real acl name */
char *prefix;
int flag;
int retval;
switch (accesstype) {
case TRANSMIT:
prefix = "xmt";
flag = ACL_XMT;
break;
case SUBSCRIBE:
prefix = "sub";
flag = ACL_SUB;
break;
case INSTWILD:
prefix = "iws";
flag = ACL_IWS;
break;
case INSTUID:
prefix = "iui";
flag = ACL_IUI;
break;
default:
syslog(LOG_ERR, "unknown access type %d", (int) accesstype);
return 0;
}
if (!(acl->acl_types & flag)) /* no acl ==> no restriction */
return 1;
sprintf(buf, "%s/%s-%s.acl", acl_dir, prefix, acl->acl_filename);
/*
* If we can't load it (because it probably doesn't exist),
* we deny access.
*/
retval = acl_load(buf);
if (retval < 0) {
syslog(LOG_DEBUG, "Error in acl_load of %s for %s", buf, sender);
return 0;
}
return acl_check(buf, sender);
}
static void
check_acl(Acl *acl)
{
acl->acl_types = 0;
check_acl_type(acl, TRANSMIT, ACL_XMT);
check_acl_type(acl, SUBSCRIBE, ACL_SUB);
check_acl_type(acl, INSTWILD, ACL_IWS);
check_acl_type(acl, INSTUID, ACL_IUI);
}
static void
check_acl_type(Acl *acl,
Access accesstype,
int typeflag)
{
char buf[MAXPATHLEN]; /* holds the real acl name */
char *prefix;
switch (accesstype) {
case TRANSMIT:
prefix = "xmt";
break;
case SUBSCRIBE:
prefix = "sub";
break;
case INSTWILD:
prefix = "iws";
break;
case INSTUID:
prefix = "iui";
break;
default:
syslog(LOG_ERR, "unknown access type %d", (int) accesstype);
return;
}
sprintf(buf, "%s/%s-%s.acl", acl_dir, prefix, acl->acl_filename);
if (!access(buf, F_OK))
acl->acl_types |= typeflag;
}
/*
* Re-init code written by TYT, 8/14/90.
*
* General plan of action; we reread the registry list, and add any
* new restricted classes. If any restricted classes disappear (this
* should be rarely) the Acl structure is not deallocated; rather,
* the acl_types field will be left at zero, since there will be no
* acl files for the (non-)restricted class.
*/
static void
access_setup(int first)
{
char buf[MAXPATHLEN];
char class_name[512]; /* assume class names <= 511 bytes */
FILE *registry;
Acl *acl;
int len;
char *colon_idx;
Code_t retval = 0;
sprintf(buf, "%s/%s", acl_dir, ZEPHYR_CLASS_REGISTRY);
registry = fopen(buf, "r");
if (!registry) {
syslog(LOG_ERR, "no registry available, all classes are free");
return;
}
while (fgets(class_name, 512, registry)) {
colon_idx = strchr(class_name, ':');
if (colon_idx != NULL)
*colon_idx = '\0';
else if ((len = strlen(class_name)) != 0)
class_name[len - 1] = '\0';
acl = 0;
if (!first) {
String *z;
z = make_string(class_name,1);
acl = class_get_acl(z);
free_string(z);
}
if (!acl) {
acl = (Acl *) malloc(sizeof(Acl));
if (!acl) {
syslog(LOG_ERR, "no mem acl alloc");
abort();
}
acl->acl_filename = strsave(class_name);
check_acl(acl);
if (!first) {
/* Try to restrict already existing class */
retval = class_restrict(class_name, acl);
if (retval == ZSRV_NOCLASS)
retval = class_setup_restricted(class_name, acl);
} else {
retval = class_setup_restricted(class_name, acl);
}
}
if (retval) {
syslog(LOG_ERR, "can't restrict %s: %s",
class_name, error_message(retval));
continue;
}
zdbug((LOG_DEBUG, "restricted %s", class_name));
}
fclose(registry);
}
void
access_init(void)
{
access_setup(1);
}
void
access_reinit(void)
{
acl_cache_reset();
access_setup(0);
}
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