Python 2.7 将pysnmp与privProtocol=usm3DESEDEPrivProtocol选项一起使用时出错

我想从配置了auth协议MD5和priv协议3DES的snmp设备获取信息

配置语句是 snmp服务器用户testuser testgroup v3 auth md5 authmd5pwd priv 3des privpwdes

用于访问设备的pysnmp代码为

from pysnmp.hlapi import *

def get(mib):
  errorIndication, errorStatus, errorIndex, varBinds = next(
      getCmd(SnmpEngine(),
             UsmUserData('nmsuser', 'authmd5pwd', 'privpwddes',
                         authProtocol=usmHMACMD5AuthProtocol,
                         privProtocol=usm3DESEDEPrivProtocol),
             UdpTransportTarget(('10.96.158.251', 161)),
             ContextData(),
             ObjectType(ObjectIdentity(mib)))
  )

  if errorIndication:
      print(errorIndication)
  elif errorStatus:
      print('%s at %s' % (errorStatus.prettyPrint(),
                          errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
  else:
      for varBind in varBinds:
          print(varBind[1])

if __name__ == "__main__":
  get('.1.3.6.1.2.1.1.5.0')

当我执行这个时，我得到

Traceback (most recent call last): File "pytest.py", line 24, in get('.1.3.6.1.2.1.1.5.0') File "pytest.py", line 11, in get ObjectType(ObjectIdentity(mib))) File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/hlapi/asyncore/sync/cmdgen.py", line 113, in getCmd File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/carrier/asyncore/dispatch.py", line 50, in runDispatcher pysnmp.error.PySnmpError: poll error: Traceback (most recent call last): ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/carrier/asyncore/dispatch.py", line 46, in runDispatcher use_poll=True, map=self.__sockMap, count=1) ; File "/usr/lib/python2.7/asyncore.py", line 220, in loop poll_fun(timeout, map) ; File "/usr/lib/python2.7/asyncore.py", line 201, in poll2 readwrite(obj, flags) ; File "/usr/lib/python2.7/asyncore.py", line 123, in readwrite obj.handle_error() ; File "/usr/lib/python2.7/asyncore.py", line 108, in readwrite obj.handle_read_event() ; File "/usr/lib/python2.7/asyncore.py", line 449, in handle_read_event self.handle_read() ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/carrier/asyncore/dgram/base.py", line 163, in handle_read self._cbFun(self, transportAddress, incomingMessage) ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/carrier/base.py", line 70, in _cbFun self, transportDomain, transportAddress, incomingMessage ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/entity/engine.py", line 152, in __receiveMessageCbFun self, transportDomain, transportAddress, wholeMsg ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/rfc3412.py", line 344, in receiveMessage statusInformation ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/rfc3412.py", line 533, in __expireRequest cachedParams['cbCtx']) ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/entity/rfc3413/cmdgen.py", line 104, in processResponsePdu (origSendRequestHandle, cbFun, cbCtx)) ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/rfc3412.py", line 153, in sendPdu pduVersion, PDU, expectResponse, sendPduHandle ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/mpmod/rfc3412.py", line 240, in prepareOutgoingMessage securityEngineId, securityName, securityLevel, scopedPDU ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/secmod/rfc3414/service.py", line 525, in generateRequestMsg None) ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/secmod/rfc3414/service.py", line 395, in __generateRequestOrResponseMsg (snmpEngineBoots, snmpEngineTime, None), dataToEncrypt ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/secmod/eso/priv/des3.py", line 117, in encryptData encryptKey, snmpEngineBoots ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/secmod/eso/priv/des3.py", line 77, in __getEncryptionKey preIV = privKey[24:32] ; File "/usr/local/lib/python2.7/dist-packages/pyasn1/type/univ.py", line 996, in __getitem__ return self.clone(self._value[i]) ; File "/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/rfc1902.py", line 202, in clone return univ.OctetString.clone(self, *args, **kwargs).setFixedLength(self.getFixedLength()) ; File "/usr/local/lib/python2.7/dist-packages/pyasn1/type/base.py", line 349, in clone return self.__class__(value, **initilaizers) ; File "/usr/local/lib/python2.7/dist-packages/pyasn1/type/univ.py", line 819, in __init__ base.AbstractSimpleAsn1Item.__init__(self, value, **kwargs) ; File "/usr/local/lib/python2.7/dist-packages/pyasn1/type/base.py", line 246, in __init__ raise exType('%s at %s' % (exValue, self.__class__.__name__)) ;ValueConstraintError: , > failed at: ValueConstraintError(" failed at: ValueConstraintError('',)",) at OctetString 回溯（最近一次呼叫最后一次）： 文件“pytest.py”，第24行，在 获取（“.1.3.6.1.2.1.1.5.0”） get中第11行的文件“pytest.py” ObjectType（ObjectIdentity（mib））） getCmd中的文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/hlapi/asyncore/sync/cmdgen.py”，第113行 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/carrier/asyncore/dispatch.py”，第50行，在runDispatcher中 pysnmp.error.PySnmpError:轮询错误：回溯（最近一次调用）： ; runDispatcher中的文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/carrier/asyncore/dispatch.py”，第46行 使用\u poll=True，map=self.\u sockMap，count=1） ; 文件“/usr/lib/python2.7/asyncore.py”，第220行，在循环中 投票乐趣（超时，地图） ; poll2中第201行的文件“/usr/lib/python2.7/asyncore.py” 读写（对象、标志） ; readwrite中的文件“/usr/lib/python2.7/asyncore.py”，第123行 对象句柄_错误（） ; 文件“/usr/lib/python2.7/asyncore.py”，第108行，读写 对象处理读取事件（） ; handle\u read\u事件中的文件“/usr/lib/python2.7/asyncore.py”，第449行 self.handle_read（） ; 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/carrier/asyncore/dgram/base.py”，第163行，在handle_read中 self.\u cbFun（self、transportAddress、incomingMessage） ; 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/carrier/base.py”，第70行，在 self、transportDomain、transportAddress、incomingMessage ; 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/entity/engine.py”，第152行，在uu receiveMessageCbFun中 self、transportDomain、transportAddress、wholeMsg ; 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/rfc3412.py”，第344行，在receiveMessage中 状态信息 ; 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/rfc3412.py”，第533行，在 cachedParams['cbCtx']） ; processResponsePdu中的文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/entity/rfc3413/cmdgen.py”，第104行 （origSendRequestHandle、cbFun、cbCtx）） ; sendPdu中的文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/rfc3412.py”，第153行 PDU版本，PDU，预期响应，发送PDU处理 ; 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/mpmod/rfc3412.py”，第240行，在prepareOutgoingMessage中 securityEngineId、securityName、securityLevel、scopedPDU ; GenerateRequestSG中的文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/secmod/rfc3414/service.py”，第525行 （无） ; 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/secmod/rfc3414/service.py”，第395行，位于uu generateRequestOrResponseMsg中 （snmpEngineBoots，snmpEngineTime，None），数据加密 ; encryptData中的文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/secmod/eso/priv/des3.py”，第117行 加密密钥，snmpEngineBoots ; 文件“/usr/local/lib/python2.7/dist-packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/secmod/eso/priv/des3.py”，第77行，在 preIV=私钥[24:32] ; 文件“/usr/local/lib/python2.7/dist packages/pyasn1/type/univ.py”，第996行，在__ 返回self.clone（self.\u值[i]） ; 文件“/usr/local/lib/python2.7/dist packages/pysnmp-4.4.3-py2.7.egg/pysnmp/proto/rfc1902.py”，第202行，克隆中 返回univ.OctetString.clone（self，*args，**kwargs）.setFixedLength（self.getFixedLength（）） ; 文件“/usr/local/lib/python2.7/dist packages/pyasn1/type/base.py”，第349行，在clone中 返回self.\uuuu类（值，**初始化器） ; 文件“/usr/local/lib/python2.7/dist packages/pyasn1/type/univ.py”，第819行，在__ base.AbstractSimpleAsn1Item.\uuuuu init\uuuuuu（self，value，**kwargs） ; 文件“/usr/local/lib/python2.7/dist-packages/pyasn1/type/base.py”，第246行，在__ 提升exType（“%s”位于“%s%”（exValue，self.\uuuuuuuu类\uuuuuuuu名称） ;ValueConstraintError:，>在以下位置失败：ValueConstraintError（“在以下位置失败：ValueConstraintError（“”，），）在OctetString

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当将3DE与短哈希HMAC（如MD5）一起使用时，似乎是pysnmp 4.4.3中的一个错误

您可以使用其他一些生成至少32个八位字节长散列的AUTH算法，也可以从其中提取固定pysnmp（4.4.4）

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一旦您更改用户名/密码，您的脚本似乎可以使用。

非常感谢。随着修复工作的顺利进行。pysnmp（4.4.4）将于何时发布？