vacm_vars.c

嵌入式操作系统ECOS的网络开发包

// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
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// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
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// this file might be covered by the GNU General Public License.
//
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// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//####UCDSNMPCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from the UCD-SNMP
// project,  <http://ucd-snmp.ucdavis.edu/>  from the University of
// California at Davis, which was originally based on the Carnegie Mellon
// University SNMP implementation.  Portions of this software are therefore
// covered by the appropriate copyright disclaimers included herein.
//
// The release used was version 4.1.2 of May 2000.  "ucd-snmp-4.1.2"
// -------------------------------------------
//
//####UCDSNMPCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    Manu Sharma
// Contributors: 
// Date:         2002-11-01
// Purpose:      Port of UCD-SNMP distribution to eCos.
// Description:  
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================
/********************************************************************
       Copyright 1989, 1991, 1992 by Carnegie Mellon University

			  Derivative Work -
Copyright 1996, 1998, 1999, 2000 The Regents of the University of California

			 All Rights Reserved

Permission to use, copy, modify and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appears in all copies and
that both that copyright notice and this permission notice appear in
supporting documentation, and that the name of CMU and The Regents of
the University of California not be used in advertising or publicity
pertaining to distribution of the software without specific written
permission.

CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL CMU OR
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*********************************************************************/
/*
 * vacm_vars.c
 *
 * SNMPv3 View-based Access Control Model
 */
/***********************************************************
	Copyright 1988, 1989 by Carnegie Mellon University

                      All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of CMU not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
******************************************************************/

#include <config.h>

#ifdef CYGPKG_SNMPAGENT_V3_SUPPORT
#ifdef CYGPKG_SNMPLIB_FILESYSTEM_SUPPORT

#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_MALLOC_H
#include <malloc.h>
#endif
#include <ctype.h>
#include <sys/types.h>
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif

#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif

#include "mibincl.h"
#include "read_config.h"
#include "agent_read_config.h"
#include "system.h"
#include "vacm.h"
#include "callback.h"
#include "agent_registry.h"
#include "agent_callbacks.h"
#include "vacm_vars.h"

#ifdef USING_MIBII_SYSORTABLE_MODULE
#if TIME_WITH_SYS_TIME
# ifdef WIN32
#  include <sys/timeb.h>
# else
#  include <sys/time.h>
# endif
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
#include <mibgroup/mibII/sysORTable.h>
#endif

void
init_vacm_vars (void) 
{

#ifdef USING_MIBII_SYSORTABLE_MODULE
  static oid reg[] = {SNMP_OID_SNMPMODULES,16,2,2,1};
#endif
  
#define PRIVRW	(SNMPV2ANY | 0x5000)

  struct variable2 vacm_sec2group[] = {
    {SECURITYGROUP, ASN_OCTET_STR, PRIVRW, var_vacm_sec2group, 1, {3}},
    {SECURITYSTORAGE, ASN_INTEGER, PRIVRW, var_vacm_sec2group, 1, {4}},
    {SECURITYSTATUS, ASN_INTEGER, PRIVRW, var_vacm_sec2group, 1, {5}},
  };

  struct variable2 vacm_access[] = {
    {ACCESSMATCH, ASN_INTEGER, PRIVRW, var_vacm_access, 1, {4}},
    {ACCESSREAD, ASN_OCTET_STR, PRIVRW, var_vacm_access, 1, {5}},
    {ACCESSWRITE, ASN_OCTET_STR, PRIVRW, var_vacm_access, 1, {6}},
    {ACCESSNOTIFY, ASN_OCTET_STR, PRIVRW, var_vacm_access, 1, {7}},
    {ACCESSSTORAGE, ASN_INTEGER, PRIVRW, var_vacm_access, 1, {8}},
    {ACCESSSTATUS, ASN_INTEGER, PRIVRW, var_vacm_access, 1, {9}},
  };

  struct variable2 vacm_view[] = {
    {VIEWMASK, ASN_OCTET_STR, PRIVRW, var_vacm_view, 1, {3}},
    {VIEWTYPE, ASN_INTEGER, PRIVRW, var_vacm_view, 1, {4}},
    {VIEWSTORAGE, ASN_INTEGER, PRIVRW, var_vacm_view, 1, {5}},
    {VIEWSTATUS, ASN_INTEGER, PRIVRW, var_vacm_view, 1, {6}},
  };

/* Define the OID pointer to the top of the mib tree that we're
   registering underneath */
  oid vacm_sec2group_oid[] = { OID_VACMGROUPENTRY };
  oid vacm_access_oid[] = { OID_VACMACCESSENTRY};
  oid vacm_view_oid[] = { OID_VACMVIEWENTRY };

  /* register ourselves with the agent to handle our mib tree */
  REGISTER_MIB("mibII/vacm:sec2group", vacm_sec2group, variable2, \
               vacm_sec2group_oid);
  REGISTER_MIB("mibII/vacm:access", vacm_access, variable2, vacm_access_oid);
  REGISTER_MIB("mibII/vacm:view", vacm_view, variable2, vacm_view_oid);

  snmpd_register_config_handler("com2sec", vacm_parse_security,
                                vacm_free_security,"name source community");
  snmpd_register_config_handler("group", vacm_parse_group, vacm_free_group,
                                "name v1|v2c|usm security");
  snmpd_register_config_handler("access", vacm_parse_access, vacm_free_access,
                            "name context model level prefx read write notify");
  snmpd_register_config_handler("view", vacm_parse_view, vacm_free_view,
                                "name type subtree [mask]");
  snmpd_register_config_handler("rwcommunity", vacm_parse_simple,
                                NULL,"community [default|hostname|network/bits] [oid]");
  snmpd_register_config_handler("rocommunity", vacm_parse_simple,
                                NULL,"community [default|hostname|network/bits] [oid]");
  snmpd_register_config_handler("rwuser", vacm_parse_simple,
                                NULL,"user [noauth|auth|priv] [oid]");
  snmpd_register_config_handler("rouser", vacm_parse_simple,
                                NULL,"user [noauth|auth|priv] [oid]");

#ifdef USING_MIBII_SYSORTABLE_MODULE
  register_sysORTable(reg,10,"View-based Access Control Model for SNMP.");
#endif

  /* register ourselves to handle access control */
  snmp_register_callback(SNMP_CALLBACK_APPLICATION, SNMPD_CALLBACK_ACM_CHECK,
                         vacm_in_view_callback, NULL);
  snmp_register_callback(SNMP_CALLBACK_APPLICATION,
                         SNMPD_CALLBACK_ACM_CHECK_INITIAL,
                         vacm_in_view_callback, NULL);
}

static struct vacm_securityEntry *securityFirst =0, *securityLast =0;

#define EXAMPLE_NETWORK		"NETWORK"
#define EXAMPLE_COMMUNITY	"COMMUNITY"

void vacm_parse_security (const char *token, 
			  char *param)
{
    char *name, *source, *community;
    const char *mask;
    char *cp;
    struct vacm_securityEntry *sp, se;
    int maskLength, maskBit;
    struct sockaddr_in *srcIp, *srcMask;
    char null[] = "";

    memset (&se, 0 , sizeof se);
    name = strtok(param, "\t\n ");
    if (!name) {
	config_perror("missing NAME parameter");
	return;
    }
    source = strtok(NULL, "\t\n ");
    if (!source) {
	config_perror("missing SOURCE parameter");
	return;
    }
    if ( !strncmp( source, EXAMPLE_NETWORK, strlen(EXAMPLE_NETWORK)) ) {
	config_perror("Example config NETWORK not properly configured");
	return;		/* or exit(1); */
    }
    community = strtok(NULL, "\t\n ");
    if (!community) {
	config_perror("missing COMMUNITY parameter");
	return;
    }
    if ( !strncmp( community, EXAMPLE_COMMUNITY, strlen(EXAMPLE_COMMUNITY)) ) {
	config_perror("Example config COMMUNITY not properly configured");
	return;		/* or exit(1); */
    }
    srcIp   = (struct sockaddr_in*)&(se.sourceIp);
    srcMask = (struct sockaddr_in*)&(se.sourceMask);
    cp = strchr(source, '/');
    if (cp == NULL) cp = null;
    else *cp++ = 0;
    mask = cp;
    if (strcmp("default", source) == 0 || strcmp("0.0.0.0", source) == 0) {
	memset(&(srcIp->sin_addr), 0, sizeof(struct in_addr));
	mask = "0.0.0.0";
    }
    else if ((srcIp->sin_addr.s_addr = inet_addr (source)) == (unsigned) -1) {
	struct hostent *hp = gethostbyname(source);
	if (hp != NULL) {
	    memcpy(&(srcIp->sin_addr), hp->h_addr, 4);
	}
	else {
	    config_perror ("bad source address");
	    return;
	}
    }
    if (*mask == 0) memset (&(srcMask->sin_addr), 0xff, sizeof(struct in_addr));
    else {
	if (strchr(mask, '.')) {
	    if ((srcMask->sin_addr.s_addr = inet_addr(mask)) == (unsigned)-1) {
		config_perror("bad mask");
		return;
	    }
	}
	else {
	    maskLength = atoi(mask);
	    if (maskLength <= 0 || maskLength > 32) {
		config_perror("bad mask length");
		return;
	    }
	    maskBit = 0x80000000L;
	    srcMask->sin_addr.s_addr = 0;
	    while (maskLength--) {
		srcMask->sin_addr.s_addr |= maskBit;
		maskBit >>= 1;
	    }
	    srcMask->sin_addr.s_addr = htonl(srcMask->sin_addr.s_addr);
	}
    }
    if ((srcIp->sin_addr.s_addr & ~srcMask->sin_addr.s_addr) != 0) {
	config_perror("source/mask mismatch");
	return;
    }
    if (strlen(name)+1 > sizeof(se.securityName)) {
    	config_perror("security name too long");
	return;
    }
    if (strlen(community)+1 > sizeof(se.community)) {
    	config_perror("community name too long");
	return;
    }
    strcpy(se.securityName, name);
    strcpy(se.community, community);
    sp = (struct vacm_securityEntry *)malloc (sizeof *sp);
    if (sp == NULL) {
    	config_perror("memory error");
	return;
    }
    *sp = se;
    if (securityFirst != NULL) {
	securityLast->next = sp;
	securityLast = sp;
    }
    else {
	securityFirst = securityLast = sp;
    }
}

void vacm_free_security (void)
{
    struct vacm_securityEntry *sp;
    while ((sp = securityFirst)) {
	securityFirst = sp->next;
	free(sp);
    }
}

void vacm_parse_group (const char *token, 
		       char *param)
{
    char *group, *model, *security;
    int imodel;
    struct vacm_groupEntry *gp = NULL;

    group = strtok (param, " \t\n");
    model = strtok (NULL, " \t\n");
    security = strtok (NULL, " \t\n");

    if (group == NULL || *group == 0) {
	config_perror("missing GROUP parameter");
	return;
    }
    if (model == NULL || *model == 0) {
	config_perror("missing MODEL parameter");
	return;
    }
    if (security == NULL || *security == 0) {
	config_perror("missing SECURITY parameter");
	return;
    }
    if (strcasecmp(model, "v1") == 0) imodel = SNMP_SEC_MODEL_SNMPv1;
    else if (strcasecmp(model, "v2c") == 0) imodel = SNMP_SEC_MODEL_SNMPv2c;
    else if (strcasecmp(model, "usm") == 0) imodel = SNMP_SEC_MODEL_USM;
    else if (strcasecmp(model, "any") == 0) {
	config_perror("bad security model \"any\" should be: v1, v2c or usm - installing anyway");