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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
*
* $Source$
* $Author$
*
* 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>
#if !defined (lint) && !defined (SABER)
static char rcsid_access_c[] =
"$Id$";
#endif
/*
*
* External routines:
*
* int access_check(notice, acl, accesstype)
* ZNotice_t *notice;
* ZAcl_t *acl;
* ZAccess_t 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.
*/
#include <sys/param.h>
#include "zserver.h"
/*
* Our private types for the acl_types field in the ZAcl_t structure.
* -TYT 8/14/90
*/
#define ACL_XMT 1
#define ACL_SUB 2
#define ACL_IWS 4
#define ACL_IUI 8
#ifdef __STDC__
# define P(s) s
#else
# define P(s) ()
#endif
static void check_acl P((ZAcl_t *acl));
static void check_acl_type P((ZAcl_t *acl, ZAccess_t accesstype,
int typeflag));
static void access_setup P((int first));
#undef P
/*
* check access. return 1 if ok, 0 if not ok.
*/
int
access_check(sender, acl, accesstype)
char *sender;
ZAcl_t *acl;
ZAccess_t 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
==> thumbs up */
return (1);
(void) sprintf(buf, "%s%s-%s.acl",
ZEPHYR_ACL_DIR,
prefix,
acl->acl_filename);
/*
* If we can't load it (because it probably doesn't exist),
* we deny access.
*/
#if 0
zdbug ((LOG_DEBUG, "checking %s for %s", buf, sender));
#endif
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)
ZAcl_t *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, accesstype, typeflag)
ZAcl_t *acl;
ZAccess_t 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;
}
(void) sprintf(buf, "%s%s-%s.acl",
ZEPHYR_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 ZAcl_t 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;
ZAcl_t *acl;
register int len;
register char *colon_idx;
Code_t retval = 0;
(void) sprintf(buf, "%s%s", ZEPHYR_ACL_DIR, ZEPHYR_CLASS_REGISTRY);
if ((registry = fopen(buf, "r")) == (FILE *) NULL) {
syslog(LOG_ERR, "no registry available, all classes are free");
return;
}
while (fgets(class_name, 512, registry) != NULL) {
if (colon_idx = index(class_name, ':'))
*colon_idx = '\0';
else if (len = strlen(class_name))
class_name[len - 1] = '\0';
acl = 0;
if (!first) {
ZSTRING *z;
z = make_zstring(class_name,1);
acl = class_get_acl(z);
free_zstring(z);
}
if (!acl) {
acl = (ZAcl_t *) xmalloc(sizeof(ZAcl_t));
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));
}
(void) fclose(registry);
return;
}
void
access_init (void)
{
access_setup (1);
}
void
access_reinit (void)
{
acl_cache_reset ();
access_setup (0);
}
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