pysnmp v3 walk 上出现加密服务不可用错误

Question

我可以从命令行运行此命令：

snmpwalk -v3 -m +MY-MIB-ROOT -m +MY-MIB -l authPriv -u MYUSER -a SHA -A "XXXXXXXX"  -x AES -X "XXXXXXXX" 1.2.3.4 .1.3.6.1.4.1.52330.6.1.2

我正在尝试使用 pysnmp 在 python 脚本中实现相同的命令：

import asyncio
from pysnmp.hlapi.v3arch.asyncio import *
from pysnmp.smi import builder, view, compiler
import logging
logging.basicConfig(level=logging.DEBUG)

# snmpwalk -v3 -m +MY-MIB-ROOT -m +MY-MIB -l authPriv -u MYUSER -a SHA -A "XXXXXXXX"  -x AES -X "XXXXXXXX" 1.2.3.4 .1.3.6.1.4.1.52330.6.1.2


# Load MIBs
mibBuilder = builder.MibBuilder()
compiler.addMibCompiler(mibBuilder, sources=['file:///usr/share/snmp/mibs'])
mibViewController = view.MibViewController(mibBuilder)

loadedModules = mibBuilder.mibSymbols.keys()
print("loadedModules:", loadedModules)

async def run(varBinds):
    snmpEngine = SnmpEngine()
    while True:
        print("A")
        errorIndication, errorStatus, errorIndex, varBindTable = await bulkCmd(
            snmpEngine,
            UsmUserData(
                'MYUSER',
                'XXXXXXXX',
                'XXXXXXXX',
                authProtocol=usmHMACSHAAuthProtocol,
                privProtocol=usmAesCfb128Protocol,
            ),
            await UdpTransportTarget.create(('1.2.3.4', 161)),
            ContextData(),
            0,
            50,
            *varBinds
        )
        if errorIndication:
            print(errorIndication)
            break
        elif errorStatus:
            print(
                f"{errorStatus.prettyPrint()} at {varBinds[int(errorIndex) - 1][0] if errorIndex else '?'}"
            )
        else:
            for varBind in varBindTable:
                oid = varBind.__getitem__(0)
                print(oid)
        varBinds = varBindTable
        if isEndOfMib(varBinds):
            break
    return

asyncio.run(
    run([ObjectType(ObjectIdentity('1.3.6.1.4.1.52330.6.1.2'))])
)

我收到此错误：

Ciphering services not available

我正在 Red Hat Enterprise Linux 版本 9.4 (Plow) 上的虚拟环境中运行脚本

$ pip list
Package            Version
------------------ ---------
certifi            2024.8.30
charset-normalizer 3.3.2
idna               3.10
Jinja2             3.1.4
MarkupSafe         2.1.5
pip                24.2
ply                3.11
pyasn1             0.6.1
pycryptodomex      3.20.0
pysmi              1.5.0
pysnmp             7.1.4
requests           2.32.3
setuptools         53.0.0
urllib3            2.2.3

Answer 1

如果其他人遇到此问题，最新版本使用了加密包，因此在我安装后它可以工作：

pip install cryptography