Network Working Group M. Bjorklund Internet-Draft Tail-f Systems Intended status: Standards Track J. Schoenwaelder Expires: January 24, 2015 Jacobs University July 23, 2014 A YANG Data Model for SNMP Configuration draft-ietf-netmod-snmp-cfg-06 Abstract This document defines a collection of YANG definitions for configuring SNMP engines. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on January 24, 2015. Copyright Notice Copyright (c) 2014 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 1] Internet-Draft July 2014 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Data Model . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 3 2.2. General Considerations . . . . . . . . . . . . . . . . . 4 2.3. Common Definitions . . . . . . . . . . . . . . . . . . . 4 2.4. Engine Configuration . . . . . . . . . . . . . . . . . . 4 2.5. Target Configuration . . . . . . . . . . . . . . . . . . 5 2.6. Notification Configuration . . . . . . . . . . . . . . . 6 2.7. Proxy Configuration . . . . . . . . . . . . . . . . . . . 7 2.8. Community Configuration . . . . . . . . . . . . . . . . . 8 2.9. View-based Access Control Model Configuration . . . . . . 9 2.10. User-based Security Model Configuration . . . . . . . . . 9 2.11. Transport Security Model Configuration . . . . . . . . . 11 2.12. Transport Layer Security Transport Model Configuration . 11 2.13. Secure Shell Transport Model Configuration . . . . . . . 12 3. Implementation Guidelines . . . . . . . . . . . . . . . . . . 13 3.1. Supporting read-only SNMP Access . . . . . . . . . . . . 14 3.2. Supporting read-write SNMP access . . . . . . . . . . . . 14 4. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.1. Module 'ietf-x509-cert-to-name' . . . . . . . . . . . . . 15 4.2. Module 'ietf-snmp' . . . . . . . . . . . . . . . . . . . 21 4.3. Submodule 'ietf-snmp-common' . . . . . . . . . . . . . . 23 4.4. Submodule 'ietf-snmp-engine' . . . . . . . . . . . . . . 27 4.5. Submodule 'ietf-snmp-target' . . . . . . . . . . . . . . 30 4.6. Submodule 'ietf-snmp-notification' . . . . . . . . . . . 34 4.7. Submodule 'ietf-snmp-proxy' . . . . . . . . . . . . . . . 38 4.8. Submodule 'ietf-snmp-community' . . . . . . . . . . . . . 41 4.9. Submodule 'ietf-snmp-vacm' . . . . . . . . . . . . . . . 46 4.10. Submodule 'ietf-snmp-usm' . . . . . . . . . . . . . . . . 51 4.11. Submodule 'ietf-snmp-tsm' . . . . . . . . . . . . . . . . 55 4.12. Submodule 'ietf-snmp-tls' . . . . . . . . . . . . . . . . 58 4.13. Submodule 'ietf-snmp-ssh' . . . . . . . . . . . . . . . . 62 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 65 6. Security Considerations . . . . . . . . . . . . . . . . . . . 67 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 69 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 69 8.1. Normative References . . . . . . . . . . . . . . . . . . 69 8.2. Informative References . . . . . . . . . . . . . . . . . 69 Appendix A. Example configurations . . . . . . . . . . . . . . . 70 A.1. Engine Configuration Example . . . . . . . . . . . . . . 71 A.2. Community Configuration Example . . . . . . . . . . . . . 71 A.3. User-based Security Model Configuration Example . . . . . 72 A.4. Target and Notification Configuration Example . . . . . . 73 A.5. Proxy Configuration Example . . . . . . . . . . . . . . . 75 A.6. View-based Access Control Model Configuration Example . . 78 A.7. Transport Layer Security Transport Model Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . 80 Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 2] Internet-Draft July 2014 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 80 1. Introduction This document defines a YANG [RFC6020] data model for the configuration of SNMP engines. The configuration model is consistent with the MIB modules defined in [RFC3411], [RFC3412], [RFC3413], [RFC3414], [RFC3415], [RFC3418], [RFC3584], [RFC5591], [RFC5592], and [RFC6353] but takes advantage of YANG's ability to define hierarchical configuration data models. The configuration data model in particular has been designed for SNMP deployments where SNMP runs in read-only mode and NETCONF is used to configure the SNMP agent. Nevertheless, the data model allows implementations that support write access both via SNMP and NETCONF in order to interwork with SNMP-managed management applications manipulating SNMP agent configuration using SNMP. Further details can be found in Section 3. The YANG data model focuses on configuration. Operational state objects are not explicitely modeled. The operational state of an SNMP agent can either be accessed directly via SNMP or, alternatively, via NETCONF using the read-only translation of the relevant SNMP MIB modules into YANG modules [RFC6643]. This document also defines a YANG data model for mapping a X.509 certificate to a name. The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, [RFC2119]. 2. Data Model In order to preserve the modularity of SNMP, the YANG configuration data model is organized in a set of YANG submodules, all sharing the same module namespace. This allows to add configuration support for additional SNMP features while keeping the number of namespaces that have to be dealt with down to a minimum. 2.1. Tree Diagrams A simplified graphical representation of the data model is used in this document. The meaning of the symbols in these diagrams is as follows: o Brackets "[" and "]" enclose list keys. Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 3] Internet-Draft July 2014 o Abbreviations before data node names: "rw" means configuration (read-write) and "ro" state data (read-only). o Symbols after data node names: "?" means an optional node, "!" means a presence container, and "*" denotes a list and leaf-list. o Parentheses enclose choice and case nodes, and case nodes are also marked with a colon (":"). o Ellipsis ("...") stands for contents of subtrees that are not shown. 2.2. General Considerations Most YANG nodes are mapped 1-1 to the corresponding MIB object. The "reference" statement is used to indicate which corresponding MIB object the YANG node is mapped to. When there is not a simple 1-1 mapping, the "description" statement explains the mapping. The persistency models in SNMP and NETCONF are quite different. In NETCONF, the persistency is defined by the datastore, whereas in SNMP it is defined either explicitly in the data model, or on a row-by-row basis by using the TEXTUAL-CONVENTION "StorageType". Thus, in the YANG model defined here, the "StorageType" columns are not present. For implementation guidelines, see Section 3. In SNMP, row creation and deletion are controlled by using the TEXTUAL-CONVENTION "RowStatus". In NETCONF, creation and deletion are handled by the protocol, not in the data model. Thus, in the YANG model defined here, the "RowStatus" columns are not present. 2.3. Common Definitions The submodule "ietf-snmp-common" defines a set of common typedefs and the top-level container "snmp". All configuration parameters defined in the other submodules are organized under this top-level container. 2.4. Engine Configuration The submodule "ietf-snmp-engine", which defines configuration parameters that are specific to SNMP engines, has the following structure: +--rw snmp +--rw engine +--rw enabled? boolean +--rw listen* [name] | +--rw name snmp:identifier Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 4] Internet-Draft July 2014 | +--rw (transport) | +--:(udp) | +--rw udp | +--rw ip inet:ip-address | +--rw port? inet:port-number +--rw version | +--rw v1? empty | +--rw v2c? empty | +--rw v3? empty +--rw engine-id? snmp:engine-id +--rw enable-authen-traps? boolean The leaf "/snmp/engine/enabled" can be used to enable/disable an SNMP engine. The list "/snmp/engine/listen" provides configuration of the transport endpoints the engine is listening to. In this submodule, SNMP over UDP is defined. SSH, TLS and Datagram Transport Layer Security (DTLS) are also supported, defined in "ietf-snmp-ssh" (Section 2.13) and "ietf-snmp-tls" (Section 2.12), respectively. The "transport" choice is expected to be augmented for other transports. The "/snmp/engine/version" container can be used to enable/disable the different message processing models [RFC3411]. 2.5. Target Configuration The submodule "ietf-snmp-target", which defines configuration parameters that correspond to the objects in SNMP-TARGET-MIB, has the following structure: Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 5] Internet-Draft July 2014 +--rw snmp +--rw target* [name] | +--rw name snmp:identifier | +--rw (transport) | | +--:(udp) | | +--rw udp | | +--rw ip inet:ip-address | | +--rw port? inet:port-number | | +--rw prefix-length? uint8 | +--rw tag* snmp:identifier | +--rw timeout? uint32 | +--rw retries? uint8 | +--rw target-params snmp:identifier +--rw target-params* [name] +--rw name snmp:identifier +--rw (params)? An entry in the list "/snmp/target" corresponds to an "snmpTargetAddrEntry". The "snmpTargetAddrTDomain" and "snmpTargetAddrTAddress" objects are mapped to transport-specific YANG nodes. Each transport is configured as a separate case in the "transport" choice. In this submodule, SNMP over UDP is defined. TLS and DTLS are also supported, defined in "ietf-snmp-tls" (Section 2.12). The "transport" choice is expected to be augmented for other transports. An entry in the list "/snmp/target-params" corresponds to an "snmpTargetParamsEntry". This list contains a choice "params", which is augmented by security model specific submodules, currently "ietf-snmp-community" (Section 2.8), "ietf-snmp-usm" (Section 2.10), and "ietf-snmp-tls" (Section 2.12). 2.6. Notification Configuration The submodule "ietf-snmp-notification", which defines configuration parameters that correspond to the objects in SNMP-NOTIFICATION-MIB, has the following structure: +--rw snmp +--rw notify* [name] | +--rw name snmp:identifier | +--rw tag snmp:identifier | +--rw type? enumeration +--rw notify-filter-profile* [name] +--rw name snmp:identifier +--rw include* snmp:wildcard-object-identifier Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 6] Internet-Draft July 2014 +--rw exclude* snmp:wildcard-object-identifier It also augments the "target-params" list defined in the "ietf-snmp-target" submodule (Section 2.5) with one leaf: +--rw snmp +--rw target-params* [name] ... +--rw notify-filter-profile? leafref An entry in the list "/snmp/notify" corresponds to an "snmpNotifyEntry". An entry in the list "/snmp/notify-filter-profile" corresponds to an "snmpNotifyFilterProfileEntry". In the MIB, there is a sparse relationship between "snmpTargetParamsTable" and "snmpNotifyFilterProfileTable". In the YANG model, this sparse relationship is represented with a leafref leaf "notify-filter-profile" in the "/snmp/target-params" list, which refers to an entry in the "/snmp/notify-filter-profile" list. The "snmpNotifyFilterTable" is represented as a list "filter" within the "/snmp/notify-filter-profile" list. This submodule defines the feature "notification-filter". A server implements this feature if it supports SNMP notification filtering [RFC3413]. 2.7. Proxy Configuration The submodule "ietf-snmp-proxy", which defines configuration parameters that correspond to the objects in SNMP-PROXY-MIB, has the following structure: +--rw snmp +--rw proxy* [name] +--rw name snmp:identifier +--rw type enumeration +--rw context-engine-id snmp:engine-id +--rw context-name? snmp:context-name +--rw target-params-in? snmp:identifier +--rw single-target-out? snmp:identifier +--rw multiple-target-out? snmp:identifier Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 7] Internet-Draft July 2014 An entry in the list "/snmp/proxy" corresponds to an "snmpProxyEntry". This submodule defines the feature "proxy". A server implements this feature if it can act as an SNMP Proxy [RFC3413]. 2.8. Community Configuration The submodule "ietf-snmp-community", which defines configuration parameters that correspond to the objects in SNMP-COMMUNITY-MIB, has the following structure: +--rw snmp +--rw community* [index] +--rw index snmp:identifier +--rw (name)? | +--:(text-name) | | +--rw text-name? string | +--:(binary-name) | +--rw binary-name? binary +--rw security-name snmp:security-name +--rw engine-id? snmp:engine-id +--rw context? snmp:context-name +--rw target-tag? snmp:identifier It also augments the "/snmp/target-params/params" choice with nodes for the Community-Based Security Model used by SNMPv1 and SNMPv2c: +--rw snmp +--rw target-params* [name] | ... | +--rw (params)? | +--:(v1) | | +--rw v1 | | +--rw security-name snmp:security-name | +--:(v2c) | +--rw v2c | +--rw security-name snmp:security-name +--rw target* [name] +--rw mms? union An entry in the list "/snmp/community" corresponds to an "snmpCommunityEntry". When a case "v1" or "v2c" is chosen, it implies a snmpTargetParamsMPModel 0 (SNMPv1) or 1 (SNMPv2), and a Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 8] Internet-Draft July 2014 snmpTargetParamsSecurityModel 1 (SNMPv1) or 2 (SNMPv2), respectively. Both cases implies a snmpTargetParamsSecurityLevel of noAuthNoPriv. 2.9. View-based Access Control Model Configuration The submodule "ietf-snmp-vacm", which defines configuration parameters that correspond to the objects in SNMP-VIEW-BASED-ACM-MIB, has the following structure: +--rw snmp +--rw vacm +--rw group* [name] | +--rw name group-name | +--rw member* [security-name] | | +--rw security-name snmp:security-name | | +--rw security-model* snmp:security-model | +--rw access* [context security-model security-level] | +--rw context snmp:context-name | +--rw context-match? enumeration | +--rw security-model snmp:security-model-or-any | +--rw security-level snmp:security-level | +--rw read-view? view-name | +--rw write-view? view-name | +--rw notify-view? vire-name +--rw view* [name] +--rw name view-name +--rw include* snmp:wildcard-object-identifier +--rw exclude* snmp:wildcard-object-identifier The "vacmSecurityToGroupTable" and "vacmAccessTable" are mapped to a structure of nested lists in the YANG model. Groups are defined in the list "/snmp/vacm/group" and for each group there is a sublist "member" that maps to "vacmSecurityToGroupTable", and a sublist "access" that maps to "vacmAccessTable". MIB views are defined in the list "/snmp/vacm/view" and for each MIB view there is a leaf-list of included subtree families and a leaf- list of excluded subtree families. This is more compact and thus a more readable representation of the "vacmViewTreeFamilyTable". 2.10. User-based Security Model Configuration The submodule "ietf-snmp-usm", which defines configuration parameters that correspond to the objects in SNMP-USER-BASED-SM-MIB, has the following structure: Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 9] Internet-Draft July 2014 +--rw snmp +--rw usm +--rw local | +--rw user* [name] | +-- {common user params} +--rw remote* [engine-id] +--rw engine-id snmp:engine-id +--rw user* [name] +-- {common user params} The "{common user params}" are: +--rw name snmp:identifier +--rw auth! | +--rw (protocol) | +--:(md5) | | +--rw md5 | | +-- rw key yang:hex-string | +--:(sha) | +--rw sha | +-- rw key yang:hex-string +--rw priv! +--rw (protocol) +--:(des) | +--rw des | +-- rw key yang:hex-string +--:(aes) +--rw aes +-- rw key yang:hex-string It also augments the "/snmp/target-params/params" choice with nodes for the SNMP User-based Security Model. +--rw snmp +--rw target-params* [name] ... +--rw (params)? +--:(usm) +--rw usm +--rw user-name snmp:security-name +--rw security-level security-level In the MIB, there is a single table with local and remote users, indexed by the engine id and user name. In the YANG model, there is one list of local users, and a nested list of remote users. Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 10] Internet-Draft July 2014 In the MIB, there are several objects related to changing the authentication and privacy keys. These objects are not present in the YANG model. However, the localized key can be changed. This implies that if the engine id is changed, all users keys need to be changed as well. 2.11. Transport Security Model Configuration The submodule "ietf-snmp-tsm", which defines configuration parameters that correspond to the objects in SNMP-TSM-MIB, has the following structure: +--rw snmp +--rw tsm +--rw use-prefix? boolean It also augments the "/snmp/target-params/params" choice with nodes for the SNMP Transport Security Model. +--rw snmp +--rw target-params* [name] ... +--rw (params)? +--:(tsm) +--rw tsm +--rw security-name snmp:security-name +--rw security-level security-level This submodule defines the feature "tsm". A server implements this feature if it supports the Transport Security Model (tsm) [RFC5591]. 2.12. Transport Layer Security Transport Model Configuration The submodule "ietf-snmp-tls", which defines configuration parameters that correspond to the objects in SNMP-TLS-TM-MIB, has the following structure: +--rw snmp ... +--rw target* [name] | ... | +--rw (transport) | ... | +--:(tls) | | +--rw tls | | +-- {common (d)tls transport params} Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 11] Internet-Draft July 2014 | +--:(dtls) | +--rw dtls | +-- {common (d)tls transport params} +--rw tlstm +--rw cert-to-name* [id] +--rw id uint32 +--rw fingerprint x509c2n:tls-fingerprint +--rw map-type identityref +--rw name string The "{common (d)tls transport params}" are: +--rw ip? inet:host +--rw port? inet:port-number +--rw client-fingerprint? x509c2n:tls-fingerprint +--rw server-fingerprint? x509c2n:tls-fingerprint +--rw server-identity? snmp:admin-string It also augments the "/snmp/engine/listen/transport" choice with objects for the D(TLS) transport endpoints: +--rw snmp +--rw engine ... +--rw listen* [name] ... +--rw (transport) ... +--:(tls) | +--rw tls | +--rw ip inet:ip-address | +--rw port? inet:port-number +--:(dtls) +--rw dtls +--rw ip inet:ip-address +--rw port? inet:port-number This submodule defines the feature "tlstm". A server implements this feature if it supports the Transport Layer Security (TLS) Transport Model (tlstm) [RFC6353]. 2.13. Secure Shell Transport Model Configuration Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 12] Internet-Draft July 2014 The submodule "ietf-snmp-ssh", which defines configuration parameters that correspond to the objects in SNMP-SSH-TM-MIB, has the following structure: +--rw snmp ... +--rw target* [name] ... +--rw (transport) ... +--:(ssh) +--rw ssh +--rw ip inet:host +--rw port? inet:port-number +--rw username? string It also augments the "/snmp/engine/listen/transport" choice with objects for the SSH transport endpoints: +--rw snmp +--rw engine ... +--rw listen* [name] ... +--rw (transport) ... +--:(ssh) +--rw ssh +--rw ip inet:host +--rw port? inet:port-number +--rw username? string This submodule defines the feature "sshtm". A server implements this feature if it supports the Secure Shell (SSH) Transport Model (sshtm) [RFC5592]. 3. Implementation Guidelines This section describes some challenges for implementations that support both the YANG models defined in this document, and either read-write or read-only SNMP access to the same data, using the standard MIB modules. As described in Section 2.2, the persistency models in NETCONF and SNMP are quite different. This poses a challenge for an implementation to support both NETCONF and SNMP access to the same Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 13] Internet-Draft July 2014 data, in particular if the data is writable over both protocols. Specifically, the configuration data may exist in some combination of the three NETCONF configuration datastores, and this data must be mapped to rows in the SNMP tables, in some SNMP contexts, with proper values for the StorageType columns. This problem is not new; it has been handled in many implementations that support configuration of the SNMP engine over a command line interface (CLI), which normally have a persistency model similar to NETCONF. Since there is not one solution that works for all cases, this document does not provide a recommended solution. Instead some of the challenges involved are described below. 3.1. Supporting read-only SNMP Access If a device implements only :writable-running, it is trivial to map the contents of "running" to data in the SNMP tables, where all instances of the StorageType columns have the value "nonVolatile". If a device implements :candidate, but not :startup, the implementation may choose to not expose the contents of the "candidate" datastore over SNMP, and map the contents of "running" as described above. As an option, the contents of "candidate" might be accessible in a separate SNMP context. If a device implements :startup, the handling of StorageType becomes more difficult. Since the contents of "running" and "startup" might differ, data in running cannot automatically be mapped to instances with StorageType "nonVolatile". If a particular entry exists in "running" but not in "startup", its StorageType should be "volatile". If a particular entry exists in "startup", but not "running", it should not be mapped to an SNMP instance, at least not in the default SNMP context. 3.2. Supporting read-write SNMP access If the implementation supports read-write access to data over SNMP, and specifically creation of table rows, special attention has to be given the handling of the RowStatus and StorageType columns. The problem is to determine which table rows to store in the configuration datastores, and which configuration datastore is appropriate for each row. The SNMP tables contain a mix of configured data and operational state, and only rows with an "active" RowStatus column should be stored in a configuration datastore. Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 14] Internet-Draft July 2014 If a device implements only :writable-running, "active" rows with a "nonVolatile" StorageType column can be stored in "running". Rows with a "volatile" StorageType column are operational state. If a device implements :candidate, but not :writable-running, all configuration changes typically go through the "candidate", even if they are done over SNMP. An implementation might have to perform some automatic commit of the "candidate" when data is written over SNMP, since there is no explicit "commit" operation in SNMP. If a device implements :startup, "nonVolatile" rows cannot just be written to "running", they must also be copied into "startup". "volatile" rows may be treated as operational state and not copied to any datastore, or copied into "running". Cooperating SNMP management applications may use spin lock objects (snmpTargetSpinLock [RFC3413], usmUserSpinLock [RFC3414], vacmViewSpinLock [RFC3415]) to coordinate concurrent write requests. Implementations supporting modifications of MIB objects protected by a spin lock via NETCONF should ensure that the spin lock objects are properly incremented whenever objects are changed via NETCONF. This allows cooperating SNMP management applications to discover that concurrent modifications are taking place. 4. Definitions 4.1. Module 'ietf-x509-cert-to-name' This YANG module imports typedefs from [RFC6991]. file "ietf-x509-cert-to-name.yang" module ietf-x509-cert-to-name { namespace "urn:ietf:params:xml:ns:yang:ietf-x509-cert-to-name"; prefix x509c2n; import ietf-yang-types { prefix yang; } organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 15] Internet-Draft July 2014 WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This module contains a collection of YANG definitions for extracting a name from a X.509 certificate. The algorithm used to extract a name from a X.509 certificate was first defined in RFC 6353. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC6353: Transport Layer Security (TLS) Transport Model for the Simple Network Management Protocol (SNMP)"; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 16] Internet-Draft July 2014 typedef tls-fingerprint { type yang:hex-string { pattern '([0-9a-fA-F]){2}(:([0-9a-fA-F]){2}){0,254}'; } description "A fingerprint value that can be used to uniquely reference other data of potentially arbitrary length. An tls-fingerprint value is composed of a 1-octet hashing algorithm identifier followed by the fingerprint value. The first octet value identifying the hashing algorithm is taken from the IANA TLS HashAlgorithm Registry (RFC 5246). The remaining octets are filled using the results of the hashing algorithm."; reference "SNMP-TLS-TM-MIB.SnmpTLSFingerprint"; } /* Identities */ identity cert-to-name { description "Base identity for algorithms to derive a name from a certificate."; } identity specified { base cert-to-name; description "Directly specifies the name to be used for the certificate. The value of the leaf 'name' in 'cert-to-name' list is used."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertSpecified"; } identity san-rfc822-name { base cert-to-name; description "Maps a subjectAltName's rfc822Name to a name. The local part of the rfc822Name is passed unaltered but the host-part of the name must be passed in lowercase. This mapping results in a 1:1 correspondence between equivalent subjectAltName rfc822Name values and name values except that the host-part of the name MUST be passed in lowercase. For example, the rfc822Name field FooBar@Example.COM is mapped to name FooBar@example.com."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertSANRFC822Name"; } identity san-dns-name { Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 17] Internet-Draft July 2014 base cert-to-name; description "Maps a subjectAltName's dNSName to a name after first converting it to all lowercase (RFC 5280 does not specify converting to lowercase so this involves an extra step). This mapping results in a 1:1 correspondence between subjectAltName dNSName values and the name values."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertSANDNSName"; } identity san-ip-address { base cert-to-name; description "Maps a subjectAltName's iPAddress to a name by transforming the binary encoded address as follows: 1) for IPv4, the value is converted into a decimal-dotted quad address (e.g., '192.0.2.1'). 2) for IPv6 addresses, the value is converted into a 32-character all lowercase hexadecimal string without any colon separators. This mapping results in a 1:1 correspondence between subjectAltName iPAddress values and the name values."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertSANIpAddress"; } identity san-any { base cert-to-name; description "Maps any of the following fields using the corresponding mapping algorithms: +------------+-----------------+ | Type | Algorithm | |------------+-----------------| | rfc822Name | san-rfc822-name | | dNSName | san-dns-name | | iPAddress | san-ip-address | +------------+-----------------+ The first matching subjectAltName value found in the certificate of the above types MUST be used when deriving the name. The mapping algorithm specified in the 'Algorithm' column MUST be used to derive the name. This mapping results in a 1:1 correspondence between Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 18] Internet-Draft July 2014 subjectAltName values and name values. The three sub-mapping algorithms produced by this combined algorithm cannot produce conflicting results between themselves."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertSANAny"; } identity common-name { base cert-to-name; description "Maps a certificate's CommonName to a name after converting it to a UTF-8 encoding. The usage of CommonNames is deprecated and users are encouraged to use subjectAltName mapping methods instead. This mapping results in a 1:1 correspondence between certificate CommonName values and name values."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertCommonName"; } /* * Groupings */ grouping cert-to-name { description "Defines nodes for mapping certificates to names. Modules that uses this grouping should describe how the resulting name is used."; list cert-to-name { key id; description "This list defines how certificates are mapped to names. The name is derived by considering each cert-to-name list entry in order. The cert-to-name entry's fingerprint determines whether the list entry is a match: 1) If the cert-to-name list entry's fingerprint value matches that of the presented certificate, then consider the list entry as a successful match. 2) If the cert-to-name list entry's fingerprint value matches that of a locally held copy of a trusted CA certificate, and that CA certificate was part of the CA certificate chain to the presented certificate, then consider the list entry as a successful match. Once a matching cert-to-name list entry has been found, the map-type is used to determine how the name associated with Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 19] Internet-Draft July 2014 the certificate should be determined. See the map-type leaf's description for details on determining the name value. If it is impossible to determine a name from the cert-to-name list entry's data combined with the data presented in the certificate, then additional cert-to-name list entries MUST be searched looking for another potential match. Security administrators are encouraged to make use of certificates with subjectAltName fields that can be mapped to names so that a single root CA certificate can allow all child certificate's subjectAltName to map directly to a name via a 1:1 transformation."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertToTSNEntry"; leaf id { type uint32; description "The id specifies the order in which the entries in the cert-to-name list are searched. Entries with lower numbers are searched first."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertToTSNID"; } leaf fingerprint { type x509c2n:tls-fingerprint; mandatory true; description "Specifies a value with which the fingerprint of the certificate presented by the peer is compared. If the fingerprint of the certificate presented by the peer does not match the fingerprint configured, then the entry is skipped and the search for a match continues."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertToTSNFingerprint"; } leaf map-type { type identityref { base cert-to-name; } mandatory true; description "Specifies the algorithm used to map the certificate presented by the peer to a name. Mappings that need additional configuration objects should use the 'when' statement to make them conditional based on the 'map-type'."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertToTSNMapType"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 20] Internet-Draft July 2014 } leaf name { when "../map-type = 'x509c2n:specified'"; type string; mandatory true; description "Directly specifies the NETCONF username when the 'map-type' is 'specified'."; reference "SNMP-TLS-TM-MIB.snmpTlstmCertToTSNData"; } } } } 4.2. Module 'ietf-snmp' file "ietf-snmp.yang" module ietf-snmp { namespace "urn:ietf:params:xml:ns:yang:ietf-snmp"; prefix snmp; // RFC Ed.: update the dates below with the date of RFC publication // and remove this note. include ietf-snmp-common { revision-date 2014-05-06; } include ietf-snmp-engine { revision-date 2014-05-06; } include ietf-snmp-target { revision-date 2014-05-06; } include ietf-snmp-notification { revision-date 2014-05-06; } include ietf-snmp-proxy { revision-date 2014-05-06; } include ietf-snmp-community { revision-date 2014-05-06; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 21] Internet-Draft July 2014 include ietf-snmp-usm { revision-date 2014-05-06; } include ietf-snmp-tsm { revision-date 2014-05-06; } include ietf-snmp-vacm { revision-date 2014-05-06; } include ietf-snmp-tls { revision-date 2014-05-06; } include ietf-snmp-ssh { revision-date 2014-05-06; } organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This module contains a collection of YANG definitions for configuring SNMP engines. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 22] Internet-Draft July 2014 This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } } 4.3. Submodule 'ietf-snmp-common' file "ietf-snmp-common.yang" submodule ietf-snmp-common { belongs-to ietf-snmp { prefix snmp; } import ietf-yang-types { prefix yang; } organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 23] Internet-Draft July 2014 Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of common YANG definitions for configuring SNMP engines. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } /* Collection of SNMP specific data types */ typedef admin-string { type string { length "0..255"; } description "Represents and SnmpAdminString as defined in RFC 3411. Note that the size of an SnmpAdminString is measured in octets, not characters."; reference "SNMP-FRAMEWORK-MIB.SnmpAdminString"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 24] Internet-Draft July 2014 } typedef identifier { type admin-string { length "1..32"; } description "Identifiers are used to name items in the SNMP configuration data store."; } typedef context-name { type admin-string { length "0..32"; } description "The context type represents an SNMP context name."; reference "RFC3411: An Architecture for Describing SNMP Management Frameworks"; } typedef security-name { type admin-string { length "1..32"; } description "The security-name type represents an SNMP security name."; reference "RFC3411: An Architecture for Describing SNMP Management Frameworks"; } typedef security-model { type union { type enumeration { enum v1 { value 1; } enum v2c { value 2; } enum usm { value 3; } enum tsm { value 4; } } type int32 { range "1..2147483647"; } } reference "RFC3411: An Architecture for Describing SNMP Management Frameworks"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 25] Internet-Draft July 2014 } typedef security-model-or-any { type union { type enumeration { enum any { value 0; } } type security-model; } reference "RFC3411: An Architecture for Describing SNMP Management Frameworks"; } typedef security-level { type enumeration { enum no-auth-no-priv { value 1; } enum auth-no-priv { value 2; } enum auth-priv { value 3; } } reference "RFC3411: An Architecture for Describing SNMP Management Frameworks"; } typedef engine-id { type yang:hex-string { pattern '([0-9a-fA-F]){2}(:([0-9a-fA-F]){2}){4,31}'; } description "The Engine ID specified as a list of colon-specified hexa- decimal octets, e.g., '80:00:02:b8:04:61:62:63'."; reference "RFC3411: An Architecture for Describing SNMP Management Frameworks"; } typedef wildcard-object-identifier { type string; description "The wildcard-object-identifier type represents an SNMP object identifier where subidentifiers can be given either as a label, in numeric form, or a wildcard, represented by a *."; } typedef tag-value { type string { length "0..255"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 26] Internet-Draft July 2014 } description "Represents and SnmpTagValue as defined in RFC 3413. Note that the size of an SnmpTagValue is measured in octets, not characters."; reference "SNMP-TARGET-MIB.SnmpTagValue"; } container snmp { description "Top-level container for SNMP related configuration and status objects."; } } 4.4. Submodule 'ietf-snmp-engine' file "ietf-snmp-engine.yang" submodule ietf-snmp-engine { belongs-to ietf-snmp { prefix snmp; } import ietf-inet-types { prefix inet; } include ietf-snmp-common; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 27] Internet-Draft July 2014 Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring SNMP engines. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } augment /snmp:snmp { container engine { description "Configuration of the SNMP engine."; leaf enabled { type boolean; default "false"; description "Enables the SNMP engine."; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 28] Internet-Draft July 2014 } list listen { key "name"; description "Configuration of the transport endpoints on which the engine listens."; leaf name { type snmp:identifier; description "An arbitrary name for the list entry."; } choice transport { mandatory true; description "The transport protocol specific parameters for this endpoint. Submodules providing configuration for additional transports are expected to augment this choice."; case udp { container udp { leaf ip { type inet:ip-address; mandatory true; description "The IPv4 or IPv6 address on which the engine listens."; } leaf port { type inet:port-number; description "The UDP port on which the engine listens. If the port is not configured, an engine that acts as a Command Responder uses port 161, and an engine that acts as a Notification Receiver uses port 162."; } } } } } container version { description "SNMP version used by the engine"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 29] Internet-Draft July 2014 leaf v1 { type empty; } leaf v2c { type empty; } leaf v3 { type empty; } } leaf engine-id { type snmp:engine-id; description "The local SNMP engine's administratively-assigned unique identifier. If this leaf is not set, the device automatically calculates an engine id, as described in RFC 3411. A server MAY initialize this leaf with the automatically created value."; reference "SNMP-FRAMEWORK-MIB.snmpEngineID"; } leaf enable-authen-traps { type boolean; description "Indicates whether the SNMP entity is permitted to generate authenticationFailure traps."; reference "SNMPv2-MIB.snmpEnableAuthenTraps"; } } } } 4.5. Submodule 'ietf-snmp-target' file "ietf-snmp-target.yang" submodule ietf-snmp-target { belongs-to ietf-snmp { prefix snmp; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 30] Internet-Draft July 2014 import ietf-inet-types { prefix inet; } include ietf-snmp-common; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring SNMP targets. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC3413: Simple Network Management Protocol (SNMP) Applications"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 31] Internet-Draft July 2014 // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } augment /snmp:snmp { list target { key name; description "List of targets."; reference "SNMP-TARGET-MIB.snmpTargetAddrTable"; leaf name { type snmp:identifier; description "Identifies the target."; reference "SNMP-TARGET-MIB.snmpTargetAddrName"; } choice transport { mandatory true; description "Transport address of the target. The snmpTargetAddrTDomain and snmpTargetAddrTAddress objects are mapped to transport-specific YANG nodes. Each transport is configured as a separate case in this choice. Submodules providing configuration for additional transports are expected to augment this choice."; reference "SNMP-TARGET-MIB.snmpTargetAddrTDomain SNMP-TARGET-MIB.snmpTargetAddrTAddress"; case udp { reference "SNMPv2-TM.snmpUDPDomain TRANSPORT-ADDRESS-MIB.transportDomainUdpIpv4 TRANSPORT-ADDRESS-MIB.transportDomainUdpIpv4z TRANSPORT-ADDRESS-MIB.transportDomainUdpIpv6 TRANSPORT-ADDRESS-MIB.transportDomainUdpIpv6z"; container udp { leaf ip { type inet:ip-address; mandatory true; reference "SNMP-TARGET-MIB.snmpTargetAddrTAddress"; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 32] Internet-Draft July 2014 leaf port { type inet:port-number; default 162; description "UDP port number"; reference "SNMP-TARGET-MIB.snmpTargetAddrTAddress"; } leaf prefix-length { type uint8; description "The value of this leaf must match the value of ../snmp:ip. If ../snmp:ip contains an ipv4 address, this leaf must be less than or equal to 32. If it contains an ipv6 address, it must be less than or equal to 128. Note that the prefix-length is currently only used by the Community-based Security Model to filter incoming messages. Furthermore, the prefix-length filtering does not cover all possible filters supported by the corresponding MIB object."; reference "SNMP-COMMUNITY-MIB.snmpTargetAddrTMask"; } } } } leaf-list tag { type snmp:tag-value; description "List of tag values used to select target address."; reference "SNMP-TARGET-MIB.snmpTargetAddrTagList"; } leaf timeout { type uint32; units "0.01 seconds"; default 1500; description "Needed only if this target can receive InformRequest-PDUs."; reference "SNMP-TARGET-MIB.snmpTargetAddrTimeout"; } leaf retries { type uint8; default 3; description "Needed only if this target can receive InformRequest-PDUs."; reference "SNMP-TARGET-MIB.snmpTargetAddrRetryCount"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 33] Internet-Draft July 2014 } leaf target-params { type snmp:identifier; mandatory true; reference "SNMP-TARGET-MIB.snmpTargetAddrParams"; } } list target-params { key name; description "List of target parameters."; reference "SNMP-TARGET-MIB.snmpTargetParamsTable"; leaf name { type snmp:identifier; } choice params { description "This choice is augmented with case nodes containing security model specific configuration parameters."; } } } } 4.6. Submodule 'ietf-snmp-notification' file "ietf-snmp-notification.yang" submodule ietf-snmp-notification { belongs-to ietf-snmp { prefix snmp; } include ietf-snmp-common; include ietf-snmp-target; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 34] Internet-Draft July 2014 WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring SNMP notifications. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC3413: Simple Network Management Protocol (SNMP) Applications"; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } feature notification-filter { description Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 35] Internet-Draft July 2014 "A server implements this feature if it supports SNMP notification filtering."; reference "RFC3413: Simple Network Management Protocol (SNMP) Applications"; } augment /snmp:snmp { list notify { key name; description "Targets that will receive notifications. Entries in this lists are mapped 1-1 to entries in snmpNotifyTable, except that if an entry in snmpNotifyTable has a snmpNotifyTag for which no snmpTargetAddrEntry exists, then the snmpNotifyTable entry is not mapped to an entry in this list."; reference "SNMP-NOTIFICATION-MIB.snmpNotifyTable"; leaf name { type snmp:identifier; description "An arbitrary name for the list entry."; reference "SNMP-NOTIFICATION-MIB.snmpNotifyName"; } leaf tag { type snmp:tag-value; mandatory true; description "Target tag, selects a set of notification targets. Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/target/tag in a valid configuration."; reference "SNMP-NOTIFICATION-MIB.snmpNotifyTag"; } leaf type { type enumeration { enum trap { value 1; } enum inform { value 2; } } default trap; description "Defines the notification type to be generated."; reference "SNMP-NOTIFICATION-MIB.snmpNotifyType"; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 36] Internet-Draft July 2014 } list notify-filter-profile { if-feature snmp:notification-filter; key name; description "Notification filter profiles. The leaf /snmp/target/notify-filter-profile is used to associate a filter profile with a target. If an entry in this list is referred to by one or more /snmp/target/notify-filter-profile, each such notify-filter-profile is represented by one snmpNotifyFilterProfileEntry. If an entry in this list is not referred to by any /snmp/target/notify-filter-profile, the entry is not mapped to snmpNotifyFilterProfileTable."; reference "SNMP-NOTIFICATION-MIB.snmpNotifyFilterProfileTable SNMP-NOTIFICATION-MIB.snmpNotifyFilterTable"; leaf name { type snmp:identifier; description "Name of the filter profile"; reference "SNMP-NOTIFICATION-MIB.snmpNotifyFilterProfileName"; } leaf-list include { type snmp:wildcard-object-identifier; description "A family of subtrees included in this filter."; reference "SNMP-NOTIFICATION-MIB.snmpNotifyFilterSubtree SNMP-NOTIFICATION-MIB.snmpNotifyFilterMask SNMP-NOTIFICATION-MIB.snmpNotifyFilterType"; } leaf-list exclude { type snmp:wildcard-object-identifier; description "A family of subtrees excluded from this filter."; reference "SNMP-NOTIFICATION-MIB.snmpNotifyFilterSubtree SNMP-NOTIFICATION-MIB.snmpNotifyFilterMask SNMP-NOTIFICATION-MIB.snmpNotifyFilterType"; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 37] Internet-Draft July 2014 } } augment /snmp:snmp/snmp:target-params { reference "SNMP-NOTIFICATION-MIB.snmpNotifyFilterProfileTable"; leaf notify-filter-profile { if-feature snmp:notification-filter; type leafref { path "/snmp/notify-filter-profile/name"; } description "This leafref leaf is used to represent the sparse relationship between the /snmp/target-params list and the /snmp/notify-filter-profile list."; reference "SNMP-NOTIFICATION-MIB.snmpNotifyFilterProfileName"; } } } 4.7. Submodule 'ietf-snmp-proxy' file "ietf-snmp-proxy.yang" submodule ietf-snmp-proxy { belongs-to ietf-snmp { prefix snmp; } include ietf-snmp-common; include ietf-snmp-target; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 38] Internet-Draft July 2014 Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring SNMP proxies. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC3413: Simple Network Management Protocol (SNMP) Applications"; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } feature proxy { description "A server implements this feature if it can act as an SNMP Proxy"; reference "RFC3413: Simple Network Management Protocol (SNMP) Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 39] Internet-Draft July 2014 Applications"; } augment /snmp:snmp { if-feature snmp:proxy; list proxy { key name; description "List of proxy parameters."; reference "SNMP-PROXY-MIB.snmpProxyTable"; leaf name { type snmp:identifier; description "Identifies the proxy parameter entry."; reference "SNMP-PROXY-MIB.snmpProxyName"; } leaf type { type enumeration { enum read { value 1; } enum write { value 2; } enum trap { value 3; } enum inform { value 4; } } mandatory true; reference "SNMP-PROXY-MIB.snmpProxyType"; } leaf context-engine-id { type snmp:engine-id; mandatory true; reference "SNMP-PROXY-MIB.snmpProxyContextEngineID"; } leaf context-name { type snmp:context-name; reference "SNMP-PROXY-MIB.snmpProxyContextName"; } leaf target-params-in { type snmp:identifier; description "The name of a target parameters list entry. Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/target-params/name in a valid configuration."; reference "SNMP-PROXY-MIB.snmpProxyTargetParamsIn"; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 40] Internet-Draft July 2014 leaf single-target-out { when "../type = 'read' or ../type = 'write'"; type snmp:identifier; description "Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/target/name in a valid configuration."; reference "SNMP-PROXY-MIB.snmpProxySingleTargetOut"; } leaf multiple-target-out { when "../type = 'trap' or ../type = 'inform'"; type snmp:tag-value; description "Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/target/tag in a valid configuration."; reference "SNMP-PROXY-MIB.snmpProxyMultipleTargetOut"; } } } } 4.8. Submodule 'ietf-snmp-community' file "ietf-snmp-community.yang" submodule ietf-snmp-community { belongs-to ietf-snmp { prefix snmp; } import ietf-netconf-acm { prefix nacm; } include ietf-snmp-common; include ietf-snmp-target; include ietf-snmp-proxy; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 41] Internet-Draft July 2014 WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring community-based SNMP. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC3584: Coexistence between Version 1, Version 2, and Version 3 of the Internet-standard Network Management Framework"; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 42] Internet-Draft July 2014 augment /snmp:snmp { list community { key index; description "List of communities"; reference "SNMP-COMMUNITY-MIB.snmpCommunityTable"; leaf index { type snmp:identifier; description "Index into the community list."; reference "SNMP-COMMUNITY-MIB.snmpCommunityIndex"; } choice name { nacm:default-deny-all; description "The community name, either specified as a string or as a binary. The binary name is used when the community name contains characters that are not legal in a string. If not set, the value of 'security-name' is operationally used as the snmpCommunityName."; reference "SNMP-COMMUNITY-MIB.snmpCommunityName"; leaf text-name { type string; description "A community name that can be represented as a YANG string."; } leaf binary-name { type binary; description "A community name represented as a binary value."; } } leaf security-name { type snmp:security-name; mandatory true; nacm:default-deny-all; description "The snmpCommunitySecurityName of this entry."; reference "SNMP-COMMUNITY-MIB.snmpCommunitySecurityName"; } leaf engine-id { if-feature snmp:proxy; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 43] Internet-Draft July 2014 type snmp:engine-id; description "If not set, the value of the local SNMP engine is operationally used by the device."; reference "SNMP-COMMUNITY-MIB.snmpCommunityContextEngineID"; } leaf context { type snmp:context-name; default ""; description "The context in which management information is accessed when using the community string specified by this entry."; reference "SNMP-COMMUNITY-MIB.snmpCommunityContextName"; } leaf target-tag { type snmp:tag-value; description "Used to limit access for this community to the specified targets. Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/target/tag in a valid configuration."; reference "SNMP-COMMUNITY-MIB.snmpCommunityTransportTag"; } } } grouping v1-target-params { container v1 { description "SNMPv1 parameters type. Represents snmpTargetParamsMPModel '0', snmpTargetParamsSecurityModel '1', and snmpTargetParamsSecurityLevel 'noAuthNoPriv'."; leaf security-name { type snmp:security-name; mandatory true; description "Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/community/security-name in a valid configuration."; reference "SNMP-TARGET-MIB.snmpTargetParamsSecurityName"; } } } grouping v2c-target-params { Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 44] Internet-Draft July 2014 container v2c { description "SNMPv2 community parameters type. Represents snmpTargetParamsMPModel '1', snmpTargetParamsSecurityModel '2', and snmpTargetParamsSecurityLevel 'noAuthNoPriv'."; leaf security-name { type snmp:security-name; mandatory true; description "Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/community/security-name in a valid configuration."; reference "SNMP-TARGET-MIB.snmpTargetParamsSecurityName"; } } } augment /snmp:snmp/snmp:target-params/snmp:params { case v1 { uses v1-target-params; } case v2c { uses v2c-target-params; } } augment /snmp:snmp/snmp:target { when "snmp:v1 or snmp:v2c"; leaf mms { type union { type enumeration { enum "unknown" { value 0; } } type int32 { range "484..max"; } } default "484"; description "The maximum message size."; reference "SNMP-COMMUNITY-MIB.snmpTargetAddrMMS"; } } } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 45] Internet-Draft July 2014 4.9. Submodule 'ietf-snmp-vacm' file "ietf-snmp-vacm.yang" submodule ietf-snmp-vacm { belongs-to ietf-snmp { prefix snmp; } include ietf-snmp-common; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring the View-based Access Control Model (VACM) of SNMP. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 46] Internet-Draft July 2014 This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC3415: View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)"; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } typedef view-name { type snmp:identifier; description "The view-name type represents an SNMP VACM view name."; } typedef group-name { type snmp:identifier; description "The group-name type represents an SNMP VACM group name."; } augment /snmp:snmp { container vacm { description "Configuration of the View-based Access Control Model"; list group { key name; description "VACM Groups. This data model has a different structure than the MIB. Groups are explicitly defined in this list, and group members are defined in the 'member' list (mapped to vacmSecurityToGroupTable), and access for the group is defined in the 'access' list (mapped to Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 47] Internet-Draft July 2014 vacmAccessTable)."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmSecurityToGroupTable SNMP-VIEW-BASED-ACM-MIB.vacmAccessTable"; leaf name { type group-name; description "The name of this VACM group."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmGroupName"; } list member { key "security-name"; description "A member of this VACM group. A certain combination of security-name and security-model MUST NOT be present in more than one group."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmSecurityToGroupTable"; leaf security-name { type snmp:security-name; description "The securityName of a group member."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmSecurityName"; } leaf-list security-model { type snmp:security-model; min-elements 1; description "The security models under which this security-name is a member of this group."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmSecurityModel"; } } list access { key "context security-model security-level"; description "Definition of access right for groups"; reference "SNMP-VIEW-BASED-ACM-MIB.vacmAccessTable"; leaf context { type snmp:context-name; description Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 48] Internet-Draft July 2014 "The context (prefix) under which the access rights apply."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmAccessContextPrefix"; } leaf context-match { type enumeration { enum exact { value 1; } enum prefix { value 2; } } default exact; reference "SNMP-VIEW-BASED-ACM-MIB.vacmAccessContextMatch"; } leaf security-model { type snmp:security-model-or-any; description "The security model under which the access rights apply."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmAccessSecurityModel"; } leaf security-level { type snmp:security-level; description "The minimum security level under which the access rights apply."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmAccessSecurityLevel"; } leaf read-view { type view-name; description "The name of the MIB view of the SNMP context authorizing read access. If this leaf does not exist in a configuration, it maps to a zero-length vacmAccessReadViewName. Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/vacm/view/name in a valid configuration."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmAccessReadViewName"; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 49] Internet-Draft July 2014 leaf write-view { type view-name; description "The name of the MIB view of the SNMP context authorizing write access. If this leaf does not exist in a configuration, it maps to a zero-length vacmAccessWriteViewName. Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/vacm/view/name in a valid configuration."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmAccessWriteViewName"; } leaf notify-view { type view-name; description "The name of the MIB view of the SNMP context authorizing notify access. If this leaf does not exist in a configuration, it maps to a zero-length vacmAccessNotifyViewName. Implementations MAY restrict the values of this leaf to be one of the available values of /snmp/vacm/view/name in a valid configuration."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmAccessNotifyViewName"; } } } list view { key name; description "Definition of MIB views."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmViewTreeFamilyTable"; leaf name { type view-name; description "The name of this VACM MIB view."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmViewTreeFamilyName"; } leaf-list include { Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 50] Internet-Draft July 2014 type snmp:wildcard-object-identifier; description "A family of subtrees included in this MIB view."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmViewTreeFamilySubtree SNMP-VIEW-BASED-ACM-MIB.vacmViewTreeFamilyMask SNMP-VIEW-BASED-ACM-MIB.vacmViewTreeFamilyType"; } leaf-list exclude { type snmp:wildcard-object-identifier; description "A family of subtrees excluded from this MIB view."; reference "SNMP-VIEW-BASED-ACM-MIB.vacmViewTreeFamilySubtree SNMP-VIEW-BASED-ACM-MIB.vacmViewTreeFamilyMask SNMP-VIEW-BASED-ACM-MIB.vacmViewTreeFamilyType"; } } } } } 4.10. Submodule 'ietf-snmp-usm' This YANG submodule imports YANG extensions from [RFC6536]. file "ietf-snmp-usm.yang" submodule ietf-snmp-usm { belongs-to ietf-snmp { prefix snmp; } import ietf-yang-types { prefix yang; } import ietf-netconf-acm { prefix nacm; } include ietf-snmp-common; include ietf-snmp-target; include ietf-snmp-proxy; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 51] Internet-Draft July 2014 organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring the User-based Security Model (USM) of SNMP. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC3414: User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)."; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 52] Internet-Draft July 2014 "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } grouping key { leaf key { type yang:hex-string; mandatory true; nacm:default-deny-all; description "Localized key specified as a list of colon-specified hexa-decimal octets"; } } grouping user-list { list user { key "name"; reference "SNMP-USER-BASED-SM-MIB.usmUserTable"; leaf name { type snmp:identifier; reference "SNMP-USER-BASED-SM-MIB.usmUserName"; } container auth { presence "enables authentication"; description "Enables authentication of the user"; choice protocol { mandatory true; reference "SNMP-USER-BASED-SM-MIB.usmUserAuthProtocol"; container md5 { uses key; reference "SNMP-USER-BASED-SM-MIB.usmHMACMD5AuthProtocol"; } container sha { uses key; reference "SNMP-USER-BASED-SM-MIB.usmHMACSHAAuthProtocol"; } } } container priv { must "../auth" { error-message Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 53] Internet-Draft July 2014 "when privacy is used, authentication must also be used"; } presence "enables encryption"; description "Enables encryption of SNMP messages."; choice protocol { mandatory true; reference "SNMP-USER-BASED-SM-MIB.usmUserPrivProtocol"; container des { uses key; reference "SNMP-USER-BASED-SM-MIB.usmDESPrivProtocol"; } container aes { uses key; reference "SNMP-USM-AES-MIB.usmAesCfb128Protocol"; } } } } } augment /snmp:snmp { container usm { description "Configuration of the User-based Security Model"; container local { uses user-list; } list remote { key "engine-id"; leaf engine-id { type snmp:engine-id; reference "SNMP-USER-BASED-SM-MIB.usmUserEngineID"; } uses user-list; } } } grouping usm-target-params { container usm { description "User based SNMPv3 parameters type. Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 54] Internet-Draft July 2014 Represents snmpTargetParamsMPModel '3' and snmpTargetParamsSecurityModel '3'"; leaf user-name { type snmp:security-name; mandatory true; reference "SNMP-TARGET-MIB.snmpTargetParamsSecurityName"; } leaf security-level { type snmp:security-level; mandatory true; reference "SNMP-TARGET-MIB.snmpTargetParamsSecurityLevel"; } } } augment /snmp:snmp/snmp:target-params/snmp:params { case usm { uses usm-target-params; } } } 4.11. Submodule 'ietf-snmp-tsm' file "ietf-snmp-tsm.yang" submodule ietf-snmp-tsm { belongs-to ietf-snmp { prefix snmp; } include ietf-snmp-common; include ietf-snmp-target; include ietf-snmp-proxy; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 55] Internet-Draft July 2014 WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring the Transport Security Model (TSM) of SNMP. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC5591: Transport Security Model for the Simple Network Management Protocol (SNMP)"; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } feature tsm { description Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 56] Internet-Draft July 2014 "A server implements this feature if it supports the Transport Security Model for SNMP."; reference "RFC5591: Transport Security Model for the Simple Network Management Protocol (SNMP)"; } augment /snmp:snmp { if-feature tsm; container tsm { description "Configuration of the Transport-based Security Model"; leaf use-prefix { type boolean; default false; reference "SNMP-TSM-MIB.snmpTsmConfigurationUsePrefix"; } } } grouping tsm-target-params { container tsm { description "Transport based security SNMPv3 parameters type. Represents snmpTargetParamsMPModel '3' and snmpTargetParamsSecurityModel '4'"; leaf security-name { type snmp:security-name; mandatory true; reference "SNMP-TARGET-MIB.snmpTargetParamsSecurityName"; } leaf security-level { type snmp:security-level; mandatory true; reference "SNMP-TARGET-MIB.snmpTargetParamsSecurityLevel"; } } } augment /snmp:snmp/snmp:target-params/snmp:params { if-feature tsm; case tsm { uses tsm-target-params; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 57] Internet-Draft July 2014 } } } 4.12. Submodule 'ietf-snmp-tls' file "ietf-snmp-tls.yang" submodule ietf-snmp-tls { belongs-to ietf-snmp { prefix snmp; } import ietf-inet-types { prefix inet; } import ietf-x509-cert-to-name { prefix x509c2n; } include ietf-snmp-common; include ietf-snmp-engine; include ietf-snmp-target; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 58] Internet-Draft July 2014 description "This submodule contains a collection of YANG definitions for configuring the Transport Layer Security Transport Model (TLSTM) of SNMP. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC6353: Transport Layer Security (TLS) Transport Model for the Simple Network Management Protocol (SNMP)"; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for SNMP Configuration"; } feature tlstm { description "A server implements this feature if it supports the Transport Layer Security Transport Model for SNMP."; reference "RFC6353: Transport Layer Security (TLS) Transport Model for the Simple Network Management Protocol (SNMP)"; } augment /snmp:snmp/snmp:engine/snmp:listen/snmp:transport { if-feature tlstm; case tls { container tls { Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 59] Internet-Draft July 2014 description "A list of IPv4 and IPv6 addresses and ports to which the engine listens for SNMP messages over TLS."; leaf ip { type inet:ip-address; mandatory true; description "The IPv4 or IPv6 address on which the engine listens for SNMP messages over TLS."; } leaf port { type inet:port-number; description "The TCP port on which the engine listens for SNMP messages over TLS. If the port is not configured, an engine that acts as a Command Responder uses port 10161, and an engine that acts as a Notification Receiver uses port 10162."; } } } case dtls { container dtls { description "A list of IPv4 and IPv6 addresses and ports to which the engine listens for SNMP messages over DTLS."; leaf ip { type inet:ip-address; mandatory true; description "The IPv4 or IPv6 address on which the engine listens for SNMP messages over DTLS."; } leaf port { type inet:port-number; description "The UDP port on which the engine listens for SNMP messages over DTLS. If the port is not configured, an engine that acts as a Command Responder uses port 10161, and an engine that acts as a Notification Receiver uses port 10162."; } Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 60] Internet-Draft July 2014 } } } augment /snmp:snmp { if-feature tlstm; container tlstm { uses x509c2n:cert-to-name { description "Defines how certificates are mapped to names. The resulting name is used as a security name."; refine cert-to-name/map-type { description "Mappings that use the snmpTlstmCertToTSNData column need to augment the 'cert-to-name' list with additional configuration objects corresponding to the snmpTlstmCertToTSNData value. Such objects should use the 'when' statement to make them conditional based on the 'map-type'."; } } } } grouping tls-transport { leaf ip { type inet:host; mandatory true; reference "SNMP-TARGET-MIB.snmpTargetAddrTAddress SNMP-TLS-TM-MIB.SnmpTLSAddress"; } leaf port { type inet:port-number; default 10161; reference "SNMP-TARGET-MIB.snmpTargetAddrTAddress SNMP-TLS-TM-MIB.SnmpTLSAddress"; } leaf client-fingerprint { type x509c2n:tls-fingerprint; reference "SNMP-TLS-TM-MIB.snmpTlstmParamsClientFingerprint"; } leaf server-fingerprint { type x509c2n:tls-fingerprint; reference "SNMP-TLS-TM-MIB.snmpTlstmAddrServerFingerprint"; } leaf server-identity { type snmp:admin-string; reference "SNMP-TLS-TM-MIB.snmpTlstmAddrServerIdentity"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 61] Internet-Draft July 2014 } } augment /snmp:snmp/snmp:target/snmp:transport { if-feature tlstm; case tls { reference "SNMP-TLS-TM-MIB.snmpTLSTCPDomain"; container tls { uses tls-transport; } } } augment /snmp:snmp/snmp:target/snmp:transport { if-feature tlstm; case dtls { reference "SNMP-TLS-TM-MIB.snmpDTLSUDPDomain"; container dtls { uses tls-transport; } } } } 4.13. Submodule 'ietf-snmp-ssh' file "ietf-snmp-ssh.yang" submodule ietf-snmp-ssh { belongs-to ietf-snmp { prefix snmp; } import ietf-inet-types { prefix inet; } include ietf-snmp-common; include ietf-snmp-engine; include ietf-snmp-target; organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 62] Internet-Draft July 2014 contact "WG Web: WG List: WG Chair: Thomas Nadeau WG Chair: Juergen Schoenwaelder Editor: Martin Bjorklund Editor: Juergen Schoenwaelder "; description "This submodule contains a collection of YANG definitions for configuring the Secure Shell Transport Model (SSHTM) of SNMP. Copyright (c) 2014 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this // note. reference "RFC5592: Secure Shell Transport Model for the Simple Network Management Protocol (SNMP)"; // RFC Ed.: update the date below with the date of RFC publication // and remove this note. revision 2014-05-06 { description "Initial revision."; reference Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 63] Internet-Draft July 2014 "RFC XXXX: A YANG Data Model for SNMP Configuration"; } feature sshtm { description "A server implements this feature if it supports the Secure Shell Transport Model for SNMP."; reference "RFC5592: Secure Shell Transport Model for the Simple Network Management Protocol (SNMP)"; } augment /snmp:snmp/snmp:engine/snmp:listen/snmp:transport { if-feature sshtm; case ssh { container ssh { description "The IPv4 or IPv6 address and port to which the engine listens for SNMP messages over SSH."; leaf ip { type inet:ip-address; mandatory true; description "The IPv4 or IPv6 address on which the engine listens for SNMP messages over SSH."; } leaf port { type inet:port-number; description "The TCP port on which the engine listens for SNMP messages over SSH. If the port is not configured, an engine that acts as a Command Responder uses port 5161, and an engine that acts as a Notification Receiver uses port 5162."; } } } } augment /snmp:snmp/snmp:target/snmp:transport { if-feature sshtm; case ssh { reference "SNMP-SSH-TM-MIB.snmpSSHDomain"; container ssh { leaf ip { Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 64] Internet-Draft July 2014 type inet:host; mandatory true; reference "SNMP-TARGET-MIB.snmpTargetAddrTAddress SNMP-SSH-TM-MIB.SnmpSSHAddress"; } leaf port { type inet:port-number; default 5161; reference "SNMP-TARGET-MIB.snmpTargetAddrTAddress SNMP-SSH-TM-MIB.SnmpSSHAddress"; } leaf username { type string; reference "SNMP-TARGET-MIB.snmpTargetAddrTAddress SNMP-SSH-TM-MIB.SnmpSSHAddress"; } } } } } 5. IANA Considerations This document registers a URI in the IETF XML registry [RFC3688]. Following the format in RFC 3688, the following registration is requested to be made. URI: urn:ietf:params:xml:ns:yang:ietf-snmp Registrant Contact: The NETMOD WG of the IETF. XML: N/A, the requested URI is an XML namespace. This document registers the following YANG modules in the YANG Module Names registry [RFC6020]. name: ietf-snmp namespace: urn:ietf:params:xml:ns:yang:ietf-snmp prefix: snmp reference: RFC XXXX name: ietf-x509-cert-to-name namespace: urn:ietf:params:xml:ns:yang:ietf-x509-cert-to-name Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 65] Internet-Draft July 2014 prefix: x509c2n reference: RFC XXXX The document registers the following YANG submodules in the YANG Module Names registry [RFC6020]. name: ietf-snmp-common parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-engine parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-community parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-notification parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-target parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-vacm parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-usm parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-tsm parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-tls parent: ietf-snmp reference: RFC XXXX name: ietf-snmp-ssh parent: ietf-snmp reference: RFC XXXX Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 66] Internet-Draft July 2014 6. Security Considerations The YANG module and submodules defined in this memo are designed to be accessed via the NETCONF protocol [RFC6241]. The lowest NETCONF layer is the secure transport layer and the mandatory-to-implement secure transport is SSH [RFC6242]. There are a number of data nodes defined in the YANG module and submodules which are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability: o The /snmp/engine subtree contains the configuration of general parameters of an SNMP engine such as the endpoints to listen on, the transports and SNMP versions enabled, or the engine's identity. Write access to this subtree should only be granted to entities configuring general SNMP engine parameters. o The /snmp/target subtree contains the configuration of SNMP targets and in particular which transports to use and their security parameters. Write access to this subtree should only be granted to the security administrator and entities configuring SNMP notification forwarding behavior. o The /snmp/notify and /snmp/notify-filter-profile subtrees contain the configuration for SNMP notification forwarding and filtering mechanism. Write access to this subtree should only be granted to entities configuring SNMP notification forwarding behavior. o The /snmp/proxy subtree contains the configuration for SNMP proxies. Write access to this subtree should only be granted to entities configuring SNMP proxies. o The /snmp/community subtree contains the configuration of the community-based security model. Write access to this subtree should only be granted to the security administrator. o The /snmp/usm subtree contains the configuration of the user-based security model. Write access to this subtree should only be granted to the security administrator. o The /snmp/tsm subtree contains the configuration of the transport layer security model for SNMP. Write access to this subtree should only be granted to the security administrator. Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 67] Internet-Draft July 2014 o The /snmp/tlstm subtree contains the configuration of the SNMP transport over (D)TLS and in particular the configuration how certificates are mapped to SNMP security names. Write access to this subtree should only be granted to the security administrator. o The /snmp/vacm subtree contains the configuration of the view- based access control mechanism used by SNMP to authorize access to management information via SNMP. Write access to this subtree should only be granted to the security administrator. Some of the readable data nodes in the YANG module and submodules may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get- config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability: o The /snmp/engine subtree subtree exposes general information about an SNMP engine such as which version(s) of SNMP are enabled or which transports are enabled. o The /snmp/target subtree exposes information which transports are used to reach certain SNMP targets which transport specific parameters are used. o The /snmp/notify and /snmp/notify-filter-profile subtrees exposes information how notifications are filtered and forwarded to notification targets. o The /snmp/proxy subtree exposes information about proxy relationships. o The /snmp/community, /snmp/usm, /snmp/tsm, /snmp/tlstm, and /snmp/ vacm subtrees are specifically sensitive since they expose information about the authentication and authorization policy used by an SNMP engine. Changes to the SNMP access control rules should be done either in an atomic way (through a single edit-config or a single commit) or care must be taken that they are done in a sequence that does not open temporarily access to resources. Implementations supporting SNMP write access must ensure that any SNMP access control rule changes over NETCONF are atomic as well to the SNMP instrumentation. In particular changes involving an internal delete/create cycle (e.g., to move a user to a different group) must be done with sufficient protections such that even a power fail immediately after the delete does not leave the administrator locked out. Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 68] Internet-Draft July 2014 Security administrators need to ensure that NETCONF access control rules and SNMP access control rules implement a consistent security policy. Specifically, the SNMP access control rules should prevent accidental leakage of sensitive security parameters such as community strings. See the Security Considerations section of [RFC3584] for further details. 7. Acknowledgments The authors want to thank Wes Hardaker and David Spakes for their detailed reviews. Additional valuable comments were provided by David Harrington, Borislav Lukovic and Randy Presuhn. Juergen Schoenwaelder was partly funded by Flamingo, a Network of Excellence project (ICT-318488) supported by the European Commission under its Seventh Framework Programme. 8. References 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC6020] Bjorklund, M., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, October 2010. [RFC6241] Enns, R., Bjorklund, M., Schoenwaelder, J., and A. Bierman, "Network Configuration Protocol (NETCONF)", RFC 6241, June 2011. [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, June 2011. [RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration Protocol (NETCONF) Access Control Model", RFC 6536, March 2012. [RFC6991] Schoenwaelder, J., "Common YANG Data Types", RFC 6991, July 2013. 8.2. Informative References [RFC3411] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks", STD 62, RFC 3411, December 2002. Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 69] Internet-Draft July 2014 [RFC3412] Case, J., Harrington, D., Presuhn, R., and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", STD 62, RFC 3412, December 2002. [RFC3413] Levi, D., Meyer, P., and B. Stewart, "Simple Network Management Protocol (SNMP) Applications", STD 62, RFC 3413, December 2002. [RFC3414] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", STD 62, RFC 3414, December 2002. [RFC3415] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", STD 62, RFC 3415, December 2002. [RFC3418] Presuhn, R., "Management Information Base (MIB) for the Simple Network Management Protocol (SNMP)", STD 62, RFC 3418, December 2002. [RFC3584] Frye, R., Levi, D., Routhier, S., and B. Wijnen, "Coexistence between Version 1, Version 2, and Version 3 of the Internet-standard Network Management Framework", BCP 74, RFC 3584, August 2003. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, January 2004. [RFC5591] Harrington, D. and W. Hardaker, "Transport Security Model for the Simple Network Management Protocol (SNMP)", RFC 5591, June 2009. [RFC5592] Harrington, D., Salowey, J., and W. Hardaker, "Secure Shell Transport Model for the Simple Network Management Protocol (SNMP)", RFC 5592, June 2009. [RFC6353] Hardaker, W., "Transport Layer Security (TLS) Transport Model for the Simple Network Management Protocol (SNMP)", RFC 6353, July 2011. [RFC6643] Schoenwaelder, J., "Translation of Structure of Management Information Version 2 (SMIv2) MIB Modules to YANG Modules", RFC 6643, July 2012. Appendix A. Example configurations Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 70] Internet-Draft July 2014 A.1. Engine Configuration Example Below is an XML instance document showing a configuration of an SNMP engine listening on UDP port 161 on IPv4 and IPv6 endpoints and accepting SNMPv2c and SNMPv3 messages. true all-ipv4-udp 0.0.0.0 161 all-ipv6-udp :: 161 80:00:02:b8:04:61:62:63 A.2. Community Configuration Example Below is an XML instance document showing a configuration that maps the community name "public" to the security-name "community-public" on the local engine with the default context name. The target tag "community-public-access" filters the access to this community name. 1 public community-public community-public-access management-station Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 71] Internet-Draft July 2014 2001:db8::abcd 161 blue community-public-access v2c-public v2c-public community-public A.3. User-based Security Model Configuration Example Below is an XML instance document showing the configuration of a local user "joey" who has no authentication or privacy keys. For the remote SNMP engine identified by the snmpEngineID '800002b804616263'H, two users are configure. The user "matt" has a localized SHA authentication key and the user "russ" has a localized SHA authentication key and an AES encryption key. joey 00:00:00:00:00:00:00:00:00:00:00:02 matt 66:95:fe:bc:92:88:e3:62:82:23: 5f:c7:15:1f:12:84:97:b3:8f:3f Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 72] Internet-Draft July 2014 russ 66:95:fe:bc:92:88:e3:62:82:23: 5f:c7:15:1f:12:84:97:b3:8f:3f 66:95:fe:bc:92:88:e3:62:82:23: 5f:c7:15:1f:12:84 bluebox 2001:db8::abcd 161 blue matt-auth matt-auth matt auth-no-priv A.4. Target and Notification Configuration Example Below is an XML instance document showing the configuration of a notification generator application (see Appendix A of [RFC3413]). Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 73] Internet-Draft July 2014 Note that the USM specific objects are defined in the ietf-snmp- usm.yang submodule. addr1 192.0.2.3 162 group1 joe-auth addr2 192.0.2.6 162 group1 joe-auth addr3 192.0.2.9 162 group2 bob-priv joe-auth joe auth-no-priv bob-priv bob auth-priv group1 group1 Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 74] Internet-Draft July 2014 trap group2 group2 trap A.5. Proxy Configuration Example Below is an XML instance document showing the configuration of a proxy forwarder application. It proxies SNMPv2c messages from command generators to a file server running a SNMPv1 agent that recognizes two community strings, "private" and "public", with different associated read views. The fileserver is represented as two "target" instances, one for each community string. If the proxy receives a SNMPv2c message with the community string "public" from a device in the "Office Network" or "Home Office Network", it gets tagged as "trusted", and the proxy uses the "private" community string when sending the message to the file server. Other SNMPv2c messages with the community string "public" get tagged as "non-trusted", and the proxy uses the "public" community string for these messages. There is also a special "backdoor" community string that can be used from any location to get "trusted" access. The "Office Network" and "Home Office Network" are represented as two "target" instances. These "target" instances have target-params "none", which refers to a non-existing target-params entry. File Server (private) 192.0.2.1 v1-private File Server (public) 192.0.2.1 v1-public Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 75] Internet-Draft July 2014 Office Network 192.0.2.0 24 office none Home Office Network 203.0.113.0 24 home-office none v1-private private v1-public public v2c-public public c1 public 80:00:61:81:c8 Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 76] Internet-Draft July 2014 trusted office c2 public 80:00:61:81:c8 trusted home-office c3 public 80:00:61:81:c8 not-trusted c4 backdoor public 80:00:61:81:c8 trusted c5 private 80:00:61:81:c8 trusted p1 read 80:00:61:81:c8 trusted v2c-public File Server (private) p2 read 80:00:61:81:c8 not-trusted v2c-public File Server (public) Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 77] Internet-Draft July 2014 If an SNMPv2c Get request with community string "public" is received from an IP address tagged as "office" or "home-office", or if the request is received from anywhere else with community string "backdoor", the implied context is "trusted" and so proxy entry "p1" matches. The request is forwarded to the file server as SNMPv1 with community "private" using community table entry "c5" for outbound params lookup. If an SNMPv2c Get request with community string "public" is received from any other IP address, the implied context is "not-trusted" so proxy entry "p2" matches, and the request is forwarded to the file server as SNMPv1 with community "public". A.6. View-based Access Control Model Configuration Example Below is an XML instance document showing the minimum-secure VACM configuration (see Appendix A of [RFC3415]). initial initial usm usm no-auth-no-priv restricted restricted usm auth-no-priv internet internet internet initial 1.3.6.1 restricted Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 78] Internet-Draft July 2014 1.3.6.1 The following XML instance document shows the semi-secure VACM configuration (only the view configuration is different). initial initial usm usm no-auth-no-priv restricted restricted usm auth-no-priv internet internet internet initial 1.3.6.1 restricted 1.3.6.1.2.1.1 1.3.6.1.2.1.11 1.3.6.1.6.3.10.2.1 1.3.6.1.6.3.11.2.1 1.3.6.1.6.3.15.1.1 Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 79] Internet-Draft July 2014 A.7. Transport Layer Security Transport Model Configuration Example Below is an XML instance document showing the configuration of the certificate to security name mapping (see Appendix A.2 and A.3 of [RFC6353]). 1 11:0A:05:11:00 x509c2n:san-any 2 11:0A:05:11:00 x509c2n:specified Joe Cool Authors' Addresses Martin Bjorklund Tail-f Systems Email: mbj@tail-f.com Juergen Schoenwaelder Jacobs University Email: j.schoenwaelder@jacobs-university.de Bjorklund & SchoenwaeldeExpires January 24, 2015 [Page 80]