SNMPv3 Secure, Safe and Still Simple
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1 Dr. Schwartzkopff IT Services SNMPv3 Secure, Safe and Still Simple Dr. Michael Schwartzkopff SNMP Seite 1/19
2 Why SNMPv3? Several attemps for a SNMPv2 solved different problems. SNMPv3 offers a general solution that emphases on security and modularity. Only SNMPv3 offers: Encryption, Authentication and Authorization. SNMPv3 the only valid IETF standard! SNMP Seite 2/19
3 A SNMPv3 Entity SNMPv3 does not speak of agents or managers, but knows entities. The definition of SNMPv3 ist modular. So v1 and v2c integrate nicely. This modularity allows for future extentions. i.e. new encryption algorithm can be implmented. The work is done by so called applications. According to the role of the entity different appications work. SNMP Seite 3/19
4 Modular Architecture SNMP Entity SNMP Applications Command Generator Notification Originator Proxy Forwarder Command Responder Notification Receiver SNMP Engine Dispatcher Message Processing Subsystem Security Subsystem Access Control Subsystem SNMP Seite 4/19
5 The Machine The dispatcher receives and and sends sends the SNMP messages. It passes the data on to the processing. The modular message processing creates or processes mesages. Modules for v1, v2 and v3 exist. The security subsystem authenticates and/or encryptes messages. A COMMUNITY (v1, v2c) and a user based security model (USM, v3) exist. Das acces control subsystem authorizes access to parts of the MIBs (view based access control model, VACM). SNMP Seite 5/19
6 The Applications The command generator creates get, getnext, getbulk and set requests. It also processes the answers. This module works in managers. The command resonder creates the answers to the requests. This module works in agents. The notification originator and receiver create or process notifications. There is pletny room for additional applicationens. SNMP Seite 6/19
7 The entities In v3 entities talk to each other. Each SNMP entity is defined by its snmpengineid. RFC3411 offers some methods calculating an unique ID. Every entity calculates it own ID. Bevore two entities exchange information the ID of the other has to be known. SNMPv3 defines a autodiscovery process. SNMP Seite 7/19
8 More Items... Username SNMPv3 defines many (!) new items. Imporant are: Security Level from noauthnopriv to authpriv. Authentication protocol MD5 or SHA1 Authentication passphrase Privacy Protocol (DES, AES) with passphrase SNMP Seite 8/19
9 The SNMPv3 packet authenticated encrypted msgversion msgid msgmaxsize msgflags msgsecuritymodel msgauthoritativeengineid msgauthoritativeengineboots MsgAutoritativeEngineTime msgusername msgauthenticationparameters msgprivacyparameters contextengineid contexname PDU Message Processing Security Subsystem Payload SNMP Seite 9/19
10 1. Create Users Create users (=secname), or map communities to a secname. USM Option createuser username (MD5 SHA) \ authpassphrase [DES AES] privpassphrase Sample: createuser misch MD5 verysecret v1 and v2c Option com2sec SECNAME SOURCE COMMUNITY z.b.: com2sec readonly /24 public SNMP Seite 10/19
11 2. Group Users Next users are grouped together: group GROUP secmodel secname Sample: group MyROSystem v1 readonly group MyROGroup usm misch SNMP Seite 11/19
12 3. Create Views Views define a part of the complete OID tree. Different groups have access to different views. Views also can be defined exclusive. view VNAME TYPE OID [MASK] Sample: view all included.1 80 view sys included view interfaces included SNMP Seite 12/19
13 4. Define Access All definitions are combined to an access: access GROUP context secmodel seclevel match read write notif Sample: access MyROSystem any noauth exact system none none access MyROGroup usm priv exact all none none SNMP Seite 13/19
14 Simple Usermanagement The options rouser and rwuser provide for a simplified management: rouser USER [noauth auth priv [OID ]] noauth: No authentication for this user. auth: The user has to authenticate. priv: The communication will be encrypted. SNMP Seite 14/19
15 v3 in snmpcmd The command line offers a lot of options for v3 use. a authprotocol MD5 SHA A authpassphrase x privprotocol DES AES X privpassphrase l seclevel noauthnopriv authpriv u secname v 3 SNMP Seite 15/19
16 v3 In The Config File No fun typing all the v3 optins. Therefor the file ~/.snmp/snmp.conf exists: defauthtype MD5 SHA defauthpassphrase passphrase defsecuritylevel noauthnopriv authpriv defsecurityname Username DefVersion 3 defprivtype DES AES defprivpassphrase passphrase Also possible: defpassphrase SNMP Seite 16/19
17 Simple... Having these entries a simple snmpwalk host.system works again. You get: Simple Network Management! SNMP Seite 17/19
18 SNMP Myth SNMP is not secure Yes! But the design of SNMPv1 was never ment to be secure. SNMPv3 is secure. All messages can be authenticated and encrypted. SNMPv3 offers a role based access model. SNMP is not safe (Traps are not acknowledged) SNMPv3 offers Informs that are being acknowledged. SNMP floods the net / overloads my router Depends on the implementation, i.e. on you! A wrong DNS-Server also can flood the net. SNMP Seite 18/19
19 Thank you very much for you attention! Questions? Michael Schwartzkopff, Seite 19/46
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