RE: SNMPV3 user Authentication Failed

Gentlemen,
		Any helping hand on this??

Thanks,
Madan 

-----Original Message-----
From: Madan (Madan Mohan) Goud 
Sent: Monday, October 08, 2007 5:43 PM
To: [email protected]
Cc: Madan (Madan Mohan) Goud
Subject: SNMPV3 user Authentication Failed

Hi All,
        Thanks for reading. I am facing problem with SNMPV3 user
authentication.

(1) I created an SNMPv3 user at the initialization code(init_usm() in
snmpusm.c). I wrote an API to create an user. It is in accordance with
usm_parse_create_usmUser API present in snmpv3.c. Instead of taking
parameters like username and authentication key from snmpd.conf, I am
supplying them as parameters to my API. I am creating this user here as
I am not using snmpd.conf for configuration. The API I wrote for
creating the user is attached with this e-mail. For clarity, I am
including only the part I changed in snmpusm.c file.

(2)  When I create the user without Authentication and Privacy, SNMPV3
works fine and I get response. When I create user with Authentication
and privacy parameters, It fails. Basically I am getting failure in the
following piece of code in the API usm_process_in_msg present in
snmpusm.c :


  /*
     * Check the authentication credentials of the message.
     */
    if (secLevel == SNMP_SEC_LEVEL_AUTHNOPRIV
        || secLevel == SNMP_SEC_LEVEL_AUTHPRIV) {
        if (sc_check_keyed_hash(user->authProtocol,
user->authProtocolLen,
                                user->authKey, user->authKeyLen,
                                wholeMsg, wholeMsgLen,
                                signature, signature_length)
            != SNMP_ERR_NOERROR) {
            DEBUGMSGTL(("usm", "Verification failed.\n"));
           if (snmp_increment_statistic(STAT_USMSTATSWRONGDIGESTS) == 0)
{
                DEBUGMSGTL(("usm", "%s\n",
                            "Failed to increment statistic."));
            }
      snmp_log(LOG_WARNING, "Authentication failed for
%s\n",user->name);      -> I am getting this error on console for the
user I created.

            return SNMPERR_USM_AUTHENTICATIONFAILURE;
        }

        DEBUGMSGTL(("usm", "Verification succeeded.\n"));
    }


Please let me know if the way I am creating user is correct. It seems
the authentication is getting failed. Your inputs for solving this
problem are highly appreciated.


Thanks in advance,
Madan



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