usmuser.c

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

//==========================================================================
//
//      ./agent/current/src/mibgroup/snmpv3/usmUser.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
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// 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):    [e-mail], [e-mail]
// Contributors: hmt
// Date:         2001-05-29
// 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.
*********************************************************************/
/* 
 * usmUser.c
 */

#include <config.h>

#ifdef CYGPKG_SNMPAGENT_V3_SUPPORT
#include <stdlib.h>

#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif

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

#include "mibincl.h"
#include "snmpusm.h"
#include "snmpv3.h"
#include "snmp-tc.h"
#include "read_config.h"
#include "agent_read_config.h"
//#include "util_funcs.h"
#include "keytools.h"
#include "tools.h"
#include "scapi.h"

#include "usmUser.h"
#include "transform_oids.h"

struct variable4 usmUser_variables[] = {
  { USMUSERSPINLOCK     , ASN_INTEGER   , RWRITE, var_usmUser, 1, { 1 } },
  { USMUSERSECURITYNAME , ASN_OCTET_STR , RONLY , var_usmUser, 3, { 2,1,3 } },
  { USMUSERCLONEFROM    , ASN_OBJECT_ID , RWRITE, var_usmUser, 3, { 2,1,4 } },
  { USMUSERAUTHPROTOCOL , ASN_OBJECT_ID , RWRITE, var_usmUser, 3, { 2,1,5 } },
  { USMUSERAUTHKEYCHANGE, ASN_OCTET_STR , RWRITE, var_usmUser, 3, { 2,1,6 } },
  { USMUSEROWNAUTHKEYCHANGE, ASN_OCTET_STR , RWRITE, var_usmUser, 3, { 2,1,7 } },
  { USMUSERPRIVPROTOCOL , ASN_OBJECT_ID , RWRITE, var_usmUser, 3, { 2,1,8 } },
  { USMUSERPRIVKEYCHANGE, ASN_OCTET_STR , RWRITE, var_usmUser, 3, { 2,1,9 } },
  { USMUSEROWNPRIVKEYCHANGE, ASN_OCTET_STR , RWRITE, var_usmUser, 3, { 2,1,10 } },
  { USMUSERPUBLIC       , ASN_OCTET_STR , RWRITE, var_usmUser, 3, { 2,1,11 } },
  { USMUSERSTORAGETYPE  , ASN_INTEGER   , RWRITE, var_usmUser, 3, { 2,1,12 } },
  { USMUSERSTATUS       , ASN_INTEGER   , RWRITE, var_usmUser, 3, { 2,1,13 } },

};

oid usmUser_variables_oid[] = {1,3,6,1,6,3,15,1,2};


/* needed for the write_ functions to find the start of the index */
#define USM_MIB_LENGTH 12

static unsigned int usmUserSpinLock=0;

void
init_usmUser(void)
{
  snmpd_register_config_handler("usmUser",
                                usm_parse_config_usmUser, NULL, NULL);
  snmpd_register_config_handler("createUser",
                                usm_parse_create_usmUser, NULL,
                                "username (MD5|SHA) passphrase [DES] [passphrase]");

  /* we need to be called back later */
  snmp_register_callback(SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_STORE_DATA,
                         usm_store_users, NULL);
  
  REGISTER_MIB("snmpv3/usmUser", usmUser_variables, variable4,
				 usmUser_variables_oid);

}

/*******************************************************************-o-******
 * usm_generate_OID
 *
 * Parameters:
 *	*prefix		(I) OID prefix to the usmUser table entry.
 *	 prefixLen	(I)
 *	*uptr		(I) Pointer to a user in the user list.
 *	*length		(O) Length of generated index OID.
 *      
 * Returns:
 *	Pointer to the OID index for the user (uptr)  -OR-
 *	NULL on failure.
 *
 *
 * Generate the index OID for a given usmUser name.  'length' is set to
 * the length of the index OID.
 *
 * Index OID format is:
 *
 *    <...prefix>.<engineID_length>.<engineID>.<user_name_length>.<user_name>
 */
oid *
usm_generate_OID(oid *prefix, size_t prefixLen, struct usmUser *uptr,
                       size_t *length)
{
  oid *indexOid;
  int i;

  *length = 2 + uptr->engineIDLen + strlen(uptr->name) + prefixLen;
  indexOid = (oid *) malloc(*length * sizeof(oid));
  if (indexOid) {
    memmove(indexOid, prefix, prefixLen * sizeof (oid));

    indexOid[prefixLen] = uptr->engineIDLen;
    for(i = 0; i < (int)uptr->engineIDLen; i++)
      indexOid[prefixLen+1+i] = (oid) uptr->engineID[i];

    indexOid[prefixLen + uptr->engineIDLen + 1] = strlen(uptr->name);
    for(i = 0; i < (int)strlen(uptr->name); i++)
      indexOid[prefixLen + uptr->engineIDLen + 2 + i] = (oid) uptr->name[i];
  }
  return indexOid;

}  /* end usm_generate_OID() */

/* usm_parse_oid(): parses an index to the usmTable to break it down into
   a engineID component and a name component.  The results are stored in:

   **engineID:   a newly malloced string.
   *engineIDLen: The length of the malloced engineID string above.
   **name:       a newly malloced string.
   *nameLen:     The length of the malloced name string above.

   returns 1 if an error is encountered, or 0 if successful.
*/
int 
usm_parse_oid(oid *oidIndex, size_t oidLen,
              unsigned char **engineID, size_t *engineIDLen,
              unsigned char **name, size_t *nameLen)
{
  int nameL;
  int engineIDL;
  int i;

  /* first check the validity of the oid */
  if ((oidLen <= 0) || (!oidIndex)) {
    DEBUGMSGTL(("usmUser","parse_oid: null oid or zero length oid passed in\n"));
    return 1;
  }
  engineIDL = *oidIndex;		/* initial engineID length */
  if ((int)oidLen < engineIDL + 2) {
    DEBUGMSGTL(("usmUser","parse_oid: invalid oid length: less than the engineIDLen\n"));
    return 1;
  }
  nameL = oidIndex[engineIDL+1];	/* the initial name length */
  if ((int)oidLen != engineIDL + nameL + 2) {
    DEBUGMSGTL(("usmUser","parse_oid: invalid oid length: length is not exact\n"));
    return 1;
  }

  /* its valid, malloc the space and store the results */
  if (engineID == NULL || name == NULL) {
    DEBUGMSGTL(("usmUser","parse_oid: null storage pointer passed in.\n"));
    return 1;
  }

  *engineID = (unsigned char *) malloc(engineIDL);
  if (*engineID == NULL) {
    DEBUGMSGTL(("usmUser","parse_oid: malloc of the engineID failed\n"));
    return 1;
  }
  *engineIDLen = engineIDL;

  *name = (unsigned char *) malloc(nameL+1);
  if (*name == NULL) {
    DEBUGMSGTL(("usmUser","parse_oid: malloc of the name failed\n"));
    free(*engineID);
    return 1;
  }
  *nameLen = nameL;
  
  for(i = 0; i < engineIDL; i++) {
    if (oidIndex[i+1] > 255) {
      goto UPO_parse_error;
    }
    engineID[0][i] = (unsigned char) oidIndex[i+1];
  }

  for(i = 0; i < nameL; i++) {
    if (oidIndex[i+2+engineIDL] > 255) {
      UPO_parse_error:
      free(*engineID);
      free(*name);
      return 1;
    }
    name[0][i] = (unsigned char) oidIndex[i+2+engineIDL];
  }
  name[0][nameL] = 0;

  return 0;

}  /* end usm_parse_oid() */

/*******************************************************************-o-******
 * usm_parse_user
 *
 * Parameters:
 *	*name		Complete OID indexing a given usmUser entry.
 *	 name_length
 *      
 * Returns:
 *	Pointer to a usmUser  -OR-
 *	NULL if name does not convert to a usmUser.
 * 
 * Convert an (full) OID and return a pointer to a matching user in the
 * user list if one exists.
 */
struct usmUser *
usm_parse_user(oid *name, size_t name_len)
{
  struct usmUser *uptr;

  char *newName;
  u_char *engineID;
  size_t nameLen, engineIDLen;
  
  /* get the name and engineID out of the incoming oid */
  if (usm_parse_oid(&name[USM_MIB_LENGTH], name_len-USM_MIB_LENGTH,
                    &engineID, &engineIDLen, (u_char **)&newName, &nameLen))
    return NULL;

  /* Now see if a user exists with these index values */
  uptr = usm_get_user(engineID, engineIDLen, newName);
  free(engineID);
  free(newName);

  return uptr;

}  /* end usm_parse_user() */

/*******************************************************************-o-******
 * var_usmUser
 *
 * Parameters:
 *	  *vp	   (I)     Variable-binding associated with this action.
 *	  *name	   (I/O)   Input name requested, output name found.
 *	  *length  (I/O)   Length of input and output oid's.
 *	   exact   (I)     TRUE if an exact match was requested.
 *	  *var_len (O)     Length of variable or 0 if function returned.
 *	(**write_method)   Hook to name a write method (UNUSED).
 *      
 * Returns:
 *	Pointer to (char *) containing related data of length 'length'
 *	  (May be NULL.)
 *
 *
 * Call-back function passed to the agent in order to return information
 * for the USM MIB tree.
 *
 *
 * If this invocation is not for USMUSERSPINLOCK, lookup user name
 * in the usmUser list.
 *
 * If the name does not match any user and the request
 * is for an exact match, -or- if the usmUser list is empty, create a 
 * new list entry.
 *
 * Finally, service the given USMUSER* var-bind.  A NULL user generally
 * results in a NULL return value.
 */
u_char *
var_usmUser(
    struct variable *vp,
    oid     *name,
    size_t  *length,
    int     exact,
    size_t  *var_len,
    WriteMethod **write_method)
{
  struct usmUser *uptr=NULL, *nptr, *pptr;
  int i, rtest, result;
  oid *indexOid;
  size_t len;

  /* variables we may use later */
  static long long_ret;
  static u_char string[1];
  static oid objid[2];                      /* for .0.0 */

  *write_method = 0;           /* assume it isnt writable for the time being */
  *var_len = sizeof(long_ret); /* assume an integer and change later if not */

  if (vp->magic != USMUSERSPINLOCK) {
    oid newname[MAX_OID_LEN];
    len = (*length < vp->namelen) ? *length : vp->namelen;
    rtest = snmp_oid_compare(name, len, vp->name, len);
    if (rtest > 0 ||
/*      (rtest == 0 && !exact && (int) vp->namelen+1 < (int) *length) || */
        (exact == 1 && rtest != 0)) {
      if (var_len)
	*var_len = 0;
      return 0;
    }
    memset(newname, 0, sizeof(newname));
    if (((int) *length) <= (int) vp->namelen || rtest == -1) {
      /* oid is not within our range yet */
      /* need to fail if not exact */