snmpv3.c

eCos/RedBoot for勤研ARM AnywhereII(4510) 含全部源代码

//==========================================================================
//
//      ./lib/current/src/snmpv3.c
//
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// 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.
//
// 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
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// 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):    hmt
// Contributors: hmt
// Date:         2000-05-30
// 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.
*********************************************************************/
/*
 * snmpv3.c
 */

#include <config.h>

#ifdef CYGPKG_SNMPAGENT_V3_SUPPORT
#include <stdio.h>
#include <sys/types.h>
#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
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_STDLIB_H
#       include <stdlib.h>
#endif

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

#include "system.h"
#include "asn1.h"
#include "snmpv3.h"
#include "callback.h"
#include "snmpusm.h"
#include "snmp.h"
#include "snmp_api.h"
#include "snmp_impl.h"
#include "read_config.h"
#include "lcd_time.h"
#include "scapi.h"
#include "tools.h"
#include "keytools.h"
#include "lcd_time.h"
#include "snmp_debug.h"
#include "snmp_logging.h"
#include "default_store.h"

#include "transform_oids.h"

static u_long		 engineBoots	   = 1;
static unsigned char	*engineID	   = NULL;
static size_t		 engineIDLength	   = 0;
static unsigned char	*oldEngineID	   = NULL;
static size_t		 oldEngineIDLength = 0;
static struct timeval	 snmpv3starttime;

/* 
 * Set up default snmpv3 parameter value storage.
 */
static oid	*defaultAuthType	= NULL;
static size_t	 defaultAuthTypeLen	= 0;
static oid	*defaultPrivType	= NULL;
static size_t	 defaultPrivTypeLen	= 0;

void
snmpv3_authtype_conf(const char *word, char *cptr)
{
  if (strcasecmp(cptr,"MD5") == 0)
    defaultAuthType = usmHMACMD5AuthProtocol;
  else if (strcasecmp(cptr,"SHA") == 0)
    defaultAuthType = usmHMACMD5AuthProtocol;
  else
    config_perror("Unknown authentication type");
  defaultAuthTypeLen = USM_LENGTH_OID_TRANSFORM;
  DEBUGMSGTL(("snmpv3","set default authentication type: %s\n", cptr));
}

oid *
get_default_authtype(size_t *len)
{
  if (defaultAuthType == NULL) {
    defaultAuthType = SNMP_DEFAULT_AUTH_PROTO;
    defaultAuthTypeLen = SNMP_DEFAULT_AUTH_PROTOLEN;
  }
  if (len)
    *len = defaultAuthTypeLen;
  return defaultAuthType;
}

void
snmpv3_privtype_conf(const char *word, char *cptr)
{
  if (strcasecmp(cptr,"DES") == 0)
    defaultPrivType = SNMP_DEFAULT_PRIV_PROTO;
  else
    config_perror("Unknown privacy type");
  defaultPrivTypeLen = SNMP_DEFAULT_PRIV_PROTOLEN;
  DEBUGMSGTL(("snmpv3","set default privacy type: %s\n", cptr));
}

oid *
get_default_privtype(size_t *len)
{
  if (defaultAuthType == NULL) {
    defaultAuthType = usmDESPrivProtocol;
    defaultPrivTypeLen = USM_LENGTH_OID_TRANSFORM;
  }
  if (len)
    *len = defaultPrivTypeLen;
  return defaultPrivType;
}

/*******************************************************************-o-******
 * snmpv3_secLevel_conf
 *
 * Parameters:
 *	*word
 *	*cptr
 *
 * Line syntax:
 *	defSecurityLevel "noAuthNoPriv" | "authNoPriv" | "authPriv"
 */
void
snmpv3_secLevel_conf(const char *word, char *cptr)
{
  char buf[1024];
  
  if (strcasecmp(cptr,"noAuthNoPriv") == 0 || strcmp(cptr, "1") == 0
	|| strcasecmp(cptr, "nanp") == 0)
    ds_set_int(DS_LIBRARY_ID, DS_LIB_SECLEVEL, SNMP_SEC_LEVEL_NOAUTH);
  else if (strcasecmp(cptr,"authNoPriv") == 0 || strcmp(cptr, "2") == 0
	|| strcasecmp(cptr, "anp") == 0)
    ds_set_int(DS_LIBRARY_ID, DS_LIB_SECLEVEL, SNMP_SEC_LEVEL_AUTHNOPRIV);
  else if (strcasecmp(cptr,"authPriv") == 0 || strcmp(cptr, "3") == 0
	|| strcasecmp(cptr, "ap") == 0)
    ds_set_int(DS_LIBRARY_ID, DS_LIB_SECLEVEL, SNMP_SEC_LEVEL_AUTHPRIV);
  else {
    sprintf(buf,"Unknown security level: %s", cptr);
    config_perror(buf);
  }
  DEBUGMSGTL(("snmpv3","default secLevel set to: %s = %d\n", cptr,
              ds_get_int(DS_LIBRARY_ID, DS_LIB_SECLEVEL)));
}

/*******************************************************************-o-******
 * setup_engineID
 *
 * Parameters:
 *	**eidp
 *	 *text	Printable (?) text to be plugged into the snmpEngineID.
 *
 * Return:
 *	Length of allocated engineID string in bytes,  -OR-
 *	-1 on error.
 *
 *
 * Create an snmpEngineID using text and the local IP address.  If eidp
 * is defined, use it to return a pointer to the newly allocated data.
 * Otherwise, use the result to define engineID defined in this module.
 *
 * Line syntax:
 *	engineID <text> | NULL
 *
 * XXX	What if a node has multiple interfaces?
 * XXX	What if multiple engines all choose the same address?
 *      (answer:  You're screwed, because you might need a kul database
 *       which is dependant on the current engineID.  Enumeration and other
 *       tricks won't work). 
 */
int
setup_engineID(u_char **eidp, const char *text)
{
  int		  enterpriseid	= htonl(ENTERPRISE_NUMBER),
		  localsetup	= (eidp) ? 0 : 1;
			/* Use local engineID if *eidp == NULL.  */
#ifdef HAVE_GETHOSTNAME
  u_char	  buf[SNMP_MAXBUF_SMALL];
  struct hostent *hent;
#endif
  u_char     *bufp = NULL;
  size_t	  len;
 

  /*
   * Determine length of the engineID string.
   */
  if (text) {
    len = 5+strlen(text);	/* 5 leading bytes+text. */

  } else {
    len = 5 + 4;		/* 5 leading bytes + four byte IPv4 address */
#ifdef HAVE_GETHOSTNAME
    gethostname((char *)buf, sizeof(buf));
    hent = gethostbyname((char *)buf);
#ifdef AF_INET6
    if (hent && hent->h_addrtype == AF_INET6)
      len += 12;		/* 16 bytes total for IPv6 address. */
#endif
#endif /* HAVE_GETHOSTNAME */
  }  /* endif -- text (1) */


  /*
   * Allocate memory and store enterprise ID.
   */
  if ((bufp = (u_char *) malloc(len)) == NULL) {
    snmp_log_perror("setup_engineID malloc");
    return -1;
  }

  memcpy(bufp, &enterpriseid, sizeof(enterpriseid)); /* XXX Must be 4 bytes! */
  bufp[0] |= 0x80;
  

  /*
   * Store the given text  -OR-   the first found IP address.
   */
  if (text) {
    bufp[4] = 4;
    memcpy((char *)bufp+5, text, strlen(text));

  } else {
    bufp[4] = 1;
#ifdef HAVE_GETHOSTNAME
    gethostname((char *)buf, sizeof(buf));
    hent = gethostbyname((char *)buf);

    if (hent && hent->h_addrtype == AF_INET) {
      memcpy(bufp+5, hent->h_addr_list[0], hent->h_length);

#ifdef AF_INET6
    } else if (hent && hent->h_addrtype == AF_INET6) {
      bufp[4] = 2;
      memcpy(bufp+5, hent->h_addr_list[0], hent->h_length);
#endif

    } else {		/* Unknown address type.  Default to 127.0.0.1. */

      bufp[5] = 127;
      bufp[6] = 0;
      bufp[7] = 0;
      bufp[8] = 1;
    }
#else /* HAVE_GETHOSTNAME */
    /* Unknown address type.  Default to 127.0.0.1. */
    
    bufp[5] = 127;
    bufp[6] = 0;
    bufp[7] = 0;
    bufp[8] = 1;
#endif /* HAVE_GETHOSTNAME */
    
  }  /* endif -- text (2) */


  /*
   * Pass the string back to the calling environment, or use it for
   * our local engineID.
   */
  if (localsetup) {
	SNMP_FREE(engineID);
	engineID	= bufp;
	engineIDLength	= len;

  } else {
	*eidp = bufp;
  }


  return len;

}  /* end setup_engineID() */

void
usm_parse_create_usmUser(const char *token, char *line) {
  char *cp;
  char buf[SNMP_MAXBUF_MEDIUM];
  struct usmUser *newuser;
  u_char	  userKey[SNMP_MAXBUF_SMALL];
  size_t	  userKeyLen = SNMP_MAXBUF_SMALL;
  int ret;

  newuser = usm_create_user();

  /* READ: Security Name */
  cp = copy_word(line, buf);
  newuser->secName = strdup(buf);
  newuser->name = strdup(buf);

  newuser->engineID = snmpv3_generate_engineID(&ret);
  if ( ret < 0 ) {
    usm_free_user(newuser);
    return;
  }
  newuser->engineIDLen = ret;

  if (!cp)
    goto add; /* no authentication or privacy type */

  /* READ: Authentication Type */
  if (strncmp(cp, "MD5", 3) == 0) {
    memcpy(newuser->authProtocol, usmHMACMD5AuthProtocol,
           sizeof(usmHMACMD5AuthProtocol));
  } else if (strncmp(cp, "SHA", 3) == 0) {
    memcpy(newuser->authProtocol, usmHMACSHA1AuthProtocol,
           sizeof(usmHMACSHA1AuthProtocol));
  } else {
    config_perror("Unknown authentication protocol");
    usm_free_user(newuser);
    return;
  }

  cp = skip_token(cp);