Comments (13)
lextm
commented on June 20, 2024
You will need to use pip list to print out the PySNMP packages (pysnmp, pyasn1, and many other related) you are using.
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madhudn24
commented on June 20, 2024
Below is the output of the same.
ubuntu@ubuntu-1:~$ pip3 list
asn1crypto (0.24.0)
attrs (17.4.0)
Automat (0.6.0)
blinker (1.4)
certifi (2018.1.18)
chardet (3.0.4)
click (6.7)
cloud-init (23.1.2)
colorama (0.3.7)
command-not-found (0.3)
configobj (5.0.6)
constantly (15.1.0)
cryptography (2.1.4)
distro-info (0.18ubuntu0.18.04.1)
httplib2 (0.9.2)
hyperlink (17.3.1)
idna (2.6)
incremental (16.10.1)
Jinja2 (2.10)
jsonpatch (1.16)
jsonpointer (1.10)
jsonschema (2.6.0)
keyring (10.6.0)
keyrings.alt (3.0)
language-selector (0.1)
MarkupSafe (1.0)
netifaces (0.10.4)
oauthlib (2.0.6)
PAM (0.4.2)
pexpect (4.2.1)
pip (9.0.1)
ply (3.11)
pyasn1 (0.4.8)
pyasn1-modules (0.2.1)
pycrypto (2.6.1)
pycryptodomex (3.18.0)
pygobject (3.26.1)
PyJWT (1.5.3)
pyOpenSSL (17.5.0)
pyserial (3.4)
pysmi (0.3.4)
pysnmp (4.4.12)
python-apt (1.6.5+ubuntu0.7)
python-debian (0.1.32)
pyxdg (0.25)
PyYAML (3.12)
requests (2.18.4)
requests-unixsocket (0.1.5)
SecretStorage (2.3.1)
service-identity (16.0.0)
setuptools (39.0.1)
six (1.11.0)
sos (4.3)
ssh-import-id (5.7)
systemd-python (234)
Twisted (17.9.0)
ubuntu-advantage-tools (27.2)
ufw (0.36)
unattended-upgrades (0.1)
urllib3 (1.22)
wheel (0.30.0)
zope.interface (4.3.2)
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madhudn24
commented on June 20, 2024
I removed securityEngineId parameter in the usmUserData and this error goes away , however the server seems to report an error saying UnknownEngine ID and this may be because the Username field is empty as per the tcpdump output below.
06:46:06.849054 IP 10.64.3.176.50914 > 192.170.1.2.snmp: F=r U="" E= C="" GetNextRequest(13)
06:46:06.849177 IP 10.64.3.176.50914 > 192.170.1.2.snmp: F=r U="" E= C="" GetNextRequest(13)
06:46:06.849931 IP 192.170.1.2.snmp > 10.64.3.176.50914: F= U="" E=_ff_42 C="" Report(31) S:snmpUsmMIB.usmMIBObjects.usmStats.usmStatsUnknownEngineIDs.0=172
06:46:06.849934 IP 192.170.1.2.snmp > 10.64.3.176.50914: F= U="" E=_ff_42 C="" Report(31) S:snmpUsmMIB.usmMIBObjects.usmStats.usmStatsUnknownEngineIDs.0=172
The SNMP server configuration seems to be fine because the snmpwalk to the same works fine
snmpwalk -v 3 -u vyos -a SHA -A authkey1 -x AES -X privkey1 -l authPriv 192.170.1.2 1.3.6.1.2.1.2.2.1.2
iso.3.6.1.2.1.2.2.1.2.1 = STRING: "lo"
iso.3.6.1.2.1.2.2.1.2.2 = STRING: "Advanced Micro Devices, Inc. [AMD] 79c970 [PCnet32 LANCE]"
iso.3.6.1.2.1.2.2.1.2.3 = STRING: "Advanced Micro Devices, Inc. [AMD] 79c970 [PCnet32 LANCE]"
iso.3.6.1.2.1.2.2.1.2.4 = STRING: "Advanced Micro Devices, Inc. [AMD] 79c970 [PCnet32 LANCE]"
iso.3.6.1.2.1.2.2.1.2.5 = STRING: "Advanced Micro Devices, Inc. [AMD] 79c970 [PCnet32 LANCE]"
iso.3.6.1.2.1.2.2.1.2.6 = STRING: "Advanced Micro Devices, Inc. [AMD] 79c970 [PCnet32 LANCE]"
iso.3.6.1.2.1.2.2.1.2.7 = STRING: "pimreg"
Am i missing anything here ?
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madhudn24
commented on June 20, 2024
@lextm any inputs on this ?
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madhudn24
commented on June 20, 2024
Ok i figured its trying to do a snmpEngineID discovery but after getting the engineID in the Report message it isn't re-sending the request with the EngineID and the username, is this a bug ?
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lextm
commented on June 20, 2024
A few SNMP v3 bugs were only fixed in pysnmp-lextudio.
Read #429 to learn more.
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madhudn24
commented on June 20, 2024
Let me try it out and see.
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madhudn24
commented on June 20, 2024
I upgraded to pysnmp-lextudio but still the same problem with that too
Package Version
------------------ --------
asn1crypto 0.24.0
certifi 2023.5.7
charset-normalizer 3.1.0
cryptography 2.1.4
idna 2.6
keyring 10.6.0
keyrings.alt 3.0
pip 23.1.2
ply 3.11
pyasn1 0.4.8
pycrypto 2.6.1
PyGObject 3.26.1
pysmi-lextudio 1.1.13
pysnmp-lextudio 5.0.28
pysnmpcrypto 0.0.4
pyxdg 0.25
requests 2.31.0
SecretStorage 2.3.1
setuptools 39.0.1
six 1.11.0
urllib3 2.0.3
wheel 0.30.0
The issue i'm seeing closely resembles to what was fixed in below commit. However the version i am using both pysnmp and pysnmp-lextudio has this fix but still i see the issue
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lextm
commented on June 20, 2024
The commit you referred to is irrelevant here. There are far too many SNMP v3 agent implementations out there, so PySNMP at this moment is only known to be compatible to a few of them.
What exactly is the device you are trying to manage (at IP 192.170.1.2)?
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madhudn24
commented on June 20, 2024
Its a Vyos router
vyos@vyos:~$ show version
Version: VyOS 1.4-rolling-202104241757
Release Train: sagitta
Built by: [email protected]
Built on: Sun 25 Apr 2021 01:17 UTC
Build UUID: 70d2ebdf-fcee-4933-a6ec-96f6bbb3bdc6
Build Commit ID: 5fb7304cfba259
Architecture: x86_64
Boot via: installed image
System type: VMware guest
Hardware vendor: VMware, Inc.
Hardware model: VMware Virtual Platform
Hardware S/N: VMware-42 3e d2 67 63 6c 91 43-a5 67 bf e3 8e 50 8b e8
Hardware UUID: 67d23e42-6c63-4391-a567-bfe38e508be8
Copyright: VyOS maintainers and contributors
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madhudn24
commented on June 20, 2024
I tried with a Cisco router with which i'm getting the message Ciphering services not available
I verified with both pycrypto as well as pycrpyptodome packages see the same result.
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madhudn24
commented on June 20, 2024
I enabled logging and checked the usmUserPrivProtocol "1.3.6.1.6.3.10.1.2.4 is valid only still not sure why its throwing this exception here.
2023-06-12 07:07:30,525 pysnmp: __generateRequestOrResponseMsg: cloned USM user entry usmUserName "RO_USER" usmUserSecurityName "RO_USER" usmUserAuthProtocol "1.3.6.1.6.3.10.1.1.3" usmUserAuthKeyLocalized "0x35412b0ea25d2475cb77e1ffd1097b01d4531177" usmUserPrivProtocol "1.3.6.1.6.3.10.1.2.4" usmUserPrivKeyLocalized "0x35412b0ea25d2475cb77e1ffd1097b01" for securityEngineID "0x800000090300c014fe91d7b0" and securityName "RO_USER"
2023-06-12 07:07:30,525 pysnmp: __generateRequestOrResponseMsg: no timeline for securityEngineID <OctetString value object, tagSet <TagSet object, tags 0:0:4>, encoding iso-8859-1, payload [0x800000090300c014fe91d7b0]>
2023-06-12 07:07:30,525 pysnmp: __generateRequestOrResponseMsg: use snmpEngineBoots 0 snmpEngineTime 0 for securityEngineID <OctetString value object, tagSet <TagSet object, tags 0:0:4>, encoding iso-8859-1, payload [0x800000090300c014fe91d7b0]>
2023-06-12 07:07:30,525 pysnmp: __generateRequestOrResponseMsg: scopedPDU ScopedPDU:
contextEngineId=0x800000090300c014fe91d7b0
contextName=
data=PDUs:
get-next-request=GetNextRequestPDU:
request-id=3451467
error-status=noError
error-index=0
variable-bindings=VarBindList:
VarBind:
name=1.3.6.1.2.1.2.2.1.2
=_BindValue:
unSpecified=
2023-06-12 07:07:30,526 pysnmp: __generateRequestOrResponseMsg: scopedPDU encoded into
00000: 30 2E 04 0C 80 00 00 09 03 00 C0 14 FE 91 D7 B0
00016: 04 00 A1 1C 02 03 34 AA 4B 02 01 00 02 01 00 30
00032: 0F 30 0D 06 09 2B 06 01 02 01 02 02 01 02 05 00
2023-06-12 07:07:30,526 pysnmp: StatusInformation: {'errorIndication': EncryptionError('Ciphering services not available')}
2023-06-12 07:07:30,526 pysnmp: processResponsePdu: origSendRequestHandle 2623644, _sendPdu() failed with StatusInformation("caused by <class 'pysnmp.proto.error.StatusInformation'>: {'errorIndication': UnknownEngineID('Unknown SNMP engine ID encountered'), 'oid': <ObjectName value object, tagSet <TagSet object, tags 0:0:6>, payload [1.3.6.1.6.3.15.1.1.4.0]>, 'val': <Counter32 value object, tagSet <TagSet object, tags 64:0:1>, subtypeSpec <ConstraintsIntersection object, consts <ValueRangeConstraint object, consts 0, 4294967295>>, payload [24]>, 'sendPduHandle': 2623644}")
Ciphering services not available
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madhudn24
commented on June 20, 2024
ok the issue with cisco router is resolved after including pycrytodomex instead of pycryptodome package
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