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Merge pull request #222 from lowSoA/enhancement-snmpv3-support

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Implement SNMPv3 support
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lgandx 2023-08-13 11:21:10 -03:00 • committed by GitHub
commit 83c817d9c2
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1 changed files with 29 additions and 17 deletions
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46
servers/SNMP.py
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@ -15,15 +15,14 @@
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from utils import *
from binascii import hexlify
from pyasn1.codec.ber.decoder import decode
if settings.Config.PY2OR3 == "PY3":
from socketserver import BaseRequestHandler
else:
from SocketServer import BaseRequestHandler
from pyasn1.codec.der.decoder import decode
class SNMP(BaseRequestHandler):
def handle(self):
data = self.request[0]
@ -31,20 +30,33 @@ class SNMP(BaseRequestHandler):
snmp_version = int(received_record['field-0'])
if snmp_version > 1:
# TODO: Add support for SNMPv3 (which will have a field-0 value of 2)
print(text("[SNMP] Unsupported SNMPv3 request received from %s" % self.client_address[0].replace("::ffff:","")))
return
if snmp_version == 3:
full_snmp_msg = hexlify(data).decode('utf-8')
received_record_inner, _ = decode(received_record['field-2'])
snmp_user = str(received_record_inner['field-3'])
engine_id = hexlify(received_record_inner['field-0']._value).decode('utf-8')
auth_params = hexlify(received_record_inner['field-4']._value).decode('utf-8')
community_string = str(received_record['field-1'])
SaveToDb(
{
SaveToDb({
"module": "SNMP",
"type": "Cleartext",
"client": self.client_address[0],
"user": community_string,
"cleartext": community_string,
"fullhash": community_string,
}
)
"type": "SNMPv3",
"client" : self.client_address[0],
"user": snmp_user,
"hash": auth_params,
"fullhash": "{}:{}:{}:{}".format(snmp_user, full_snmp_msg, engine_id, auth_params)
})
else:
community_string = str(received_record['field-1'])
snmp_version = '1' if snmp_version == 0 else '2c'
SaveToDb(
{
"module": "SNMP",
"type": "Cleartext SNMPv{}".format(snmp_version),
"client": self.client_address[0],
"user": community_string,
"cleartext": community_string,
"fullhash": community_string,
}
)