[erlang-questions] Two SNMP questions: SHA auth + authPriv, authenticationFailure trap

Scott Lystig Fritchie <>
Mon Apr 23 09:58:52 CEST 2007


>>>>> "mb" == Martin Bjorklund <> writes:

mb> So validate_key_change/4 should do the
mb> corresponding validation.  Thus, the code should be something
mb> like:

That yields a different error, this during the set phase.

% snmpusm -v 3 -l authPriv -u superuser-sha -a SHA -A shaphrase \
    -x DES privphrase localhost:55161 \
    -Cx passwd privphrase privpriv

=ERROR REPORT==== 23-Apr-2007::01:27:17 ===
** User error: {snmp_user_based_sm_mib,usmUserTable,[]} with set (table), returned: {'EXIT',{function_clause,[{snmp_misc,str_xor,[[],[30,210,149,239,237,30,4,15]]},{snmp_misc,str_xor,2},{snmp_user_based_sm_mib,set_key_change,4},{snmp_user_based_sm_mib,validate_set,3},{snmpa_set_lib,dbg_apply,3},{snmpa_set_lib,set_value_all_rows,4},{snmpa_set_lib,try_set,1},{snmpa_set,set_phase_two,2}]}}. Using genErr.

My naive eyes can't immediately see how
snmp_user_based_sm_mib:extract_new_key/3 is supposed to deal with a
KeyChange list that's much longer than the OldKey: the above error
seems to happen because Delta ends up an empty list.  Hrm.

>> (*) The 5.4 version of "snmpusm" uses a different method for
>> changing passwords, I think.  It appears to be using the "Own"
>> columns in usmUserTable.

mb> But this doesn't work either, does it?

It actually does work, as long as the agent's config uses
{multi_threaded, false} .

-Scott



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