| Internet-Draft | NSF-Facing Interface YANG Data Model | January 2022 |
| Kim, et al. | Expires 1 August 2022 | [Page] |
This document defines a YANG data model for configuring security policy rules on Network Security Functions (NSF) in the Interface to Network Security Functions (I2NSF) framework. The YANG data model in this document corresponds to the information model for NSF-Facing Interface in the I2NSF framework.¶
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Copyright (c) 2022 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 (https://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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.¶
This document defines a YANG [RFC6020][RFC7950] data model for security policy rule configuration of Network Security Functions (NSF). The YANG data model in this document is based on the information and data model in [I-D.ietf-i2nsf-capability-data-model] for the NSF-Facing Interface in the Interface to Network Security Functions (I2NSF) architecture [RFC8329]. The YANG data model in this document focuses on security policy configuration for the NSFs discussed in [I-D.ietf-i2nsf-capability-data-model], i.e., generic NSF (operate on packet header for layer 2, layer3, and layer 4) and advanced NSF (Intrusion Prevention System, URL-Filtering, anti-DDoS, Antivirus, and VoIP/VoLTE Filter).¶
This YANG data model uses an "Event-Condition-Action" (ECA) policy model that is used as the basis for the design of I2NSF Policy described in [RFC8329] and [I-D.ietf-i2nsf-capability-data-model].¶
The "ietf-i2nsf-policy-rule-for-nsf" YANG module defined in this document provides the configuration of the following features.¶
The key words "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] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶
This document uses the terminology described in [RFC8329].¶
This document follows the guidelines of [RFC8407], uses the common YANG types defined in [RFC6991], and adopts the Network Management Datastore Architecture (NMDA). The meaning of the symbols in tree diagrams is defined in [RFC8340].¶
This section shows a YANG tree diagram of policy for network security functions. [I-D.ietf-i2nsf-capability-data-model].¶
This section shows a YANG tree diagram for a general I2NSF security policy rule for generic network security functions.¶
module: ietf-i2nsf-policy-rule-for-nsf
+--rw i2nsf-security-policy* [name]
+--rw name string
+--rw priority-usage? identityref
+--rw resolution-strategy? identityref
+--rw default-action? identityref
+--rw rules* [name]
| +--rw name string
| +--rw description? string
| +--rw priority? uint8
| +--rw enable? boolean
| +--rw session-aging-time? uint16
| +--rw long-connection
| | +--rw enable? boolean
| | +--rw duration? uint16
| +--rw event
| | ...
| +--rw condition
| | ...
| +--rw action
| ...
+--rw rule-group
+--rw groups* [name]
+--rw name string
+--rw rule-name* -> ../../../rules/name
+--rw enable? boolean
+--rw description? string
A security policy is used by one virtual instance of an NSF/device as a set of security rules to protect assets from major risk factors that threaten the system. There can be multiple security policies in a single NSF to provide the necessary protection. The security policy includes its name, priority usage, resolution strategy, default action, and rules.¶
A resolution strategy is used to decide how to resolve conflicts that occur between the actions of the same or different policy rules that are matched and contained in a particular NSF. The resolution strategy is defined as First Matching Rule (FMR), Last Matching Rule (LMR), Prioritized Matching Rule (PMR) with Errors (PMRE), and Prioritized Matching Rule with No Errors (PMRN). The resolution strategy can be extended according to specific vendor action features. The resolution strategy is described in detail in [I-D.ietf-i2nsf-capability-data-model].¶
A default action is used to execute I2NSF policy rule when no rule matches a packet. The default action is defined as pass, drop, rate-limit, and mirror. The default action can be extended according to specific vendor action features. The default action is described in detail in [I-D.ietf-i2nsf-capability-data-model].¶
The rules include rule name, rule description, rule priority, rule enable, event, condition, and action.¶
This section shows a YANG tree diagram for an event clause for a general I2NSF security policy rule for generic network security functions.¶
module: ietf-i2nsf-policy-rule-for-nsf
+--rw i2nsf-security-policy* [name]
...
+--rw rules* [name]
| ...
| +--rw event
| | +--rw description? string
| | +--rw time
| | | +--rw start-date-time? yang:date-and-time
| | | +--rw end-date-time? yang:date-and-time
| | | +--rw period
| | | | +--rw start-time? time
| | | | +--rw end-time? time
| | | | +--rw day* day
| | | | +--rw date* int8
| | | | +--rw month* string
| | | +--rw frequency? enumeration
| | +--rw event-clauses
| | +--rw system-event* identityref
| | +--rw system-alarm* identityref
| +--rw condition
| ...
| +--rw action
| ...
+--rw rule-group
...
module: ietf-i2nsf-policy-rule-for-nsf
+--rw i2nsf-security-policy* [name]
...
+--rw rules* [name]
| ...
| +--rw event
| | +--rw description? string
| | +--rw time
| | | +--rw start-date-time? yang:date-and-time
| | | +--rw end-date-time? yang:date-and-time
| | | +--rw period
| | | | +--rw start-time? time
| | | | +--rw end-time? time
| | | | +--rw day* day
| | | | +--rw date* int8
| | | | +--rw month* string
| | | +--rw frequency? enumeration
| | +--rw event-clauses
| | +--rw system-event* identityref
| | +--rw system-alarm* identityref
| +--rw condition
| | ...
| +--rw action
| ...
+--rw rule-group
...
An event clause is any important occurrence at a specific time of a change in the system being managed, and/or in the environment of the system being managed. An event clause is used to trigger the evaluation of the condition clause of the I2NSF Policy Rule. The event clause is defined as a system event, system alarm [I-D.ietf-i2nsf-nsf-monitoring-data-model] and time. The event clause can be extended according to specific vendor event features. The event clause is described in detail in [I-D.ietf-i2nsf-capability-data-model].¶
This section shows a YANG tree diagram for a condition clause for a general I2NSF security policy rule for generic network security functions.¶
module: ietf-i2nsf-policy-rule-for-nsf
+--rw i2nsf-security-policy* [name]
...
+--rw rules* [name]
| ...
| +--rw event
| ...
| +--rw condition
| | +--rw description? string
| | +--rw ethernet
| | | +--rw description? string
| | | +--rw destination-mac-address? yang:mac-address
| | | +--rw destination-mac-address-mask? yang:mac-address
| | | +--rw source-mac-address? yang:mac-address
| | | +--rw source-mac-address-mask? yang:mac-address
| | | +--rw ethertype? eth:ethertype
| | +--rw ipv4
| | | +--rw description? string
| | | +--rw dscp? inet:dscp
| | | +--rw ecn? uint8
| | | +--rw length? uint16
| | | +--rw ttl? uint8
| | | +--rw protocol? uint8
| | | +--rw ihl? uint8
| | | +--rw flags? bits
| | | +--rw offset? uint16
| | | +--rw identification? uint16
| | | +--rw (destination-network)?
| | | | +--:(destination-ipv4-network)
| | | | +--rw destination-ipv4-network? inet:ipv4-prefix
| | | +--rw (source-network)?
| | | +--:(source-ipv4-network)
| | | +--rw source-ipv4-network? inet:ipv4-prefix
| | +--rw ipv6
| | | +--rw description? string
| | | +--rw dscp? inet:dscp
| | | +--rw ecn? uint8
| | | +--rw length? uint16
| | | +--rw ttl? uint8
| | | +--rw protocol? uint8
| | | +--rw (destination-network)?
| | | | +--:(destination-ipv6-network)
| | | | +--rw destination-ipv6-network? inet:ipv6-prefix
| | | +--rw (source-network)?
| | | | +--:(source-ipv6-network)
| | | | +--rw source-ipv6-network? inet:ipv6-prefix
| | | +--rw flow-label? inet:ipv6-flow-label
| | +--rw tcp
| | | +--rw description? string
| | | +--rw source-port-number
| | | | +--rw (source-port)?
| | | | +--:(range-or-operator)
| | | | | +--rw (port-range-or-operator)?
| | | | | +--:(range)
| | | | | | +--rw lower-port inet:port-number
| | | | | | +--rw upper-port inet:port-number
| | | | | +--:(operator)
| | | | | +--rw operator? operator
| | | | | +--rw port inet:port-number
| | | | +--:(port-list)
| | | | +--rw port-numbers* [start]
| | | | +--rw start inet:port-number
| | | | +--rw end? inet:port-number
| | | +--rw destination-port-number
| | | | +--rw (destination-port)?
| | | | +--:(range-or-operator)
| | | | | +--rw (port-range-or-operator)?
| | | | | +--:(range)
| | | | | | +--rw lower-port inet:port-number
| | | | | | +--rw upper-port inet:port-number
| | | | | +--:(operator)
| | | | | +--rw operator? operator
| | | | | +--rw port inet:port-number
| | | | +--:(port-list)
| | | | +--rw port-numbers* [start]
| | | | +--rw start inet:port-number
| | | | +--rw end? inet:port-number
| | | +--rw sequence-number? uint32
| | | +--rw acknowledgement-number? uint32
| | | +--rw data-offset? uint8
| | | +--rw reserved? uint8
| | | +--rw flags? bits
| | | +--rw window-size? uint16
| | | +--rw urgent-pointer? uint16
| | | +--rw options? binary
| | +--rw udp
| | | +--rw description? string
| | | +--rw source-port-number
| | | | +--rw (source-port)?
| | | | +--:(range-or-operator)
| | | | | +--rw (port-range-or-operator)?
| | | | | +--:(range)
| | | | | | +--rw lower-port inet:port-number
| | | | | | +--rw upper-port inet:port-number
| | | | | +--:(operator)
| | | | | +--rw operator? operator
| | | | | +--rw port inet:port-number
| | | | +--:(port-list)
| | | | +--rw port-numbers* [start]
| | | | +--rw start inet:port-number
| | | | +--rw end? inet:port-number
| | | +--rw destination-port-number
| | | | +--rw (destination-port)?
| | | | +--:(range-or-operator)
| | | | | +--rw (port-range-or-operator)?
| | | | | +--:(range)
| | | | | | +--rw lower-port inet:port-number
| | | | | | +--rw upper-port inet:port-number
| | | | | +--:(operator)
| | | | | +--rw operator? operator
| | | | | +--rw port inet:port-number
| | | | +--:(port-list)
| | | | +--rw port-numbers* [start]
| | | | +--rw start inet:port-number
| | | | +--rw end? inet:port-number
| | | +--rw length? uint16
| | +--rw sctp
| | | +--rw description? string
| | | +--rw source-port-number
| | | | +--rw (source-port)?
| | | | +--:(range-or-operator)
| | | | | +--rw (port-range-or-operator)?
| | | | | +--:(range)
| | | | | | +--rw lower-port inet:port-number
| | | | | | +--rw upper-port inet:port-number
| | | | | +--:(operator)
| | | | | +--rw operator? operator
| | | | | +--rw port inet:port-number
| | | | +--:(port-list)
| | | | +--rw port-numbers* [start]
| | | | +--rw start inet:port-number
| | | | +--rw end? inet:port-number
| | | +--rw destination-port-number
| | | | +--rw (destination-port)?
| | | | +--:(range-or-operator)
| | | | | +--rw (port-range-or-operator)?
| | | | | +--:(range)
| | | | | | +--rw lower-port inet:port-number
| | | | | | +--rw upper-port inet:port-number
| | | | | +--:(operator)
| | | | | +--rw operator? operator
| | | | | +--rw port inet:port-number
| | | | +--:(port-list)
| | | | +--rw port-numbers* [start]
| | | | +--rw start inet:port-number
| | | | +--rw end? inet:port-number
| | | +--rw chunk-type* uint8
| | +--rw dccp
| | | +--rw description? string
| | | +--rw source-port-number
| | | | +--rw (source-port)?
| | | | +--:(range-or-operator)
| | | | | +--rw (port-range-or-operator)?
| | | | | +--:(range)
| | | | | | +--rw lower-port inet:port-number
| | | | | | +--rw upper-port inet:port-number
| | | | | +--:(operator)
| | | | | +--rw operator? operator
| | | | | +--rw port inet:port-number
| | | | +--:(port-list)
| | | | +--rw port-numbers* [start]
| | | | +--rw start inet:port-number
| | | | +--rw end? inet:port-number
| | | +--rw destination-port-number
| | | | +--rw (destination-port)?
| | | | +--:(range-or-operator)
| | | | | +--rw (port-range-or-operator)?
| | | | | +--:(range)
| | | | | | +--rw lower-port inet:port-number
| | | | | | +--rw upper-port inet:port-number
| | | | | +--:(operator)
| | | | | +--rw operator? operator
| | | | | +--rw port inet:port-number
| | | | +--:(port-list)
| | | | +--rw port-numbers* [start]
| | | | +--rw start inet:port-number
| | | | +--rw end? inet:port-number
| | | +--rw service-code* uint32
| | | +--rw type* uint8
| | +--rw icmp* [version]
| | | +--rw description? string
| | | +--rw version enumeration
| | | +--rw type? uint8
| | | +--rw code? uint8
| | | +--rw rest-of-header? binary
| | +--rw url-category
| | | +--rw description? string
| | | +--rw pre-defined* string
| | | +--rw user-defined* string
| | +--rw voice
| | | +--rw description? string
| | | +--rw source-voice-id* string
| | | +--rw destination-voice-id* string
| | | +--rw user-agent* string
| | +--rw ddos
| | | +--rw description? string
| | | +--rw alert-packet-rate? uint32
| | | +--rw alert-flow-rate? uint32
| | | +--rw alert-byte-rate? uint32
| | +--rw anti-virus
| | | +--rw profile* string
| | | +--rw exception-files* string
| | +--rw payload
| | | +--rw description? string
| | | +--rw content* string
| | +--rw context
| | +--rw description? string
| | +--rw application
| | | +--rw description? string
| | | +--rw object* string
| | | +--rw group* string
| | | +--rw label* string
| | | +--rw category
| | | +--rw application-category* [name subcategory]
| | | +--rw name string
| | | +--rw subcategory string
| | +--rw device-type
| | | +--rw description? string
| | | +--rw device* identityref
| | +--rw users
| | | +--rw description? string
| | | +--rw user* [id]
| | | | +--rw id uint32
| | | | +--rw name? string
| | | +--rw group* [id]
| | | | +--rw id uint32
| | | | +--rw name? string
| | | +--rw security-group? string
| | +--rw geographic-location
| | +--rw description? string
| | +--rw source* string
| | +--rw destination* string
| +--rw action
| ...
+--rw rule-group
...
A condition clause is defined as a set of attributes, features, and/or values that are to be compared with a set of known attributes, features, and/or values in order to determine whether or not the set of actions in that (imperative) I2NSF policy rule can be executed or not. A condition clause is classified as a condition of generic network security functions, advanced network security functions, or context. A condition clause of generic network security functions is defined as IPv4 condition, IPv6 condition, TCP condition, UDP condition, SCTP condition, DCCP condition, or ICMP (ICMPv4 and ICMPv6) condition.¶
Note that the data model in this document does not focus on only IP addresses, but focuses on all the fields of IPv4 and IPv6 headers. The IPv4 and IPv6 headers have similarity with some different fields. In this case, it is better to handle separately the IPv4 and IPv6 headers such that the different fields can be used to handle IPv4 and IPv6 packets.¶
A condition clause of advanced network security functions is defined as url category condition, voice condition, DDoS condition, or payload condition. A condition clause of context is defined as application condition, target condition, users condition, and geography condition.¶
Note that this document deals only with conditions of several advanced network security functions such as url filter (i.e., web filter), VoIP/VoLTE security, and DDoS-attack mitigator. A condition clause of other advanced network security functions such as Intrusion Prevention System (IPS) and Data Loss Prevention (DLP) can be defined as an extension in future. A condition clause can be extended according to specific vendor condition features. A condition clause is described in detail in [I-D.ietf-i2nsf-capability-data-model].¶
This section shows a YANG tree diagram for an action clause for a general I2NSF security policy rule for generic network security functions.¶
module: ietf-i2nsf-policy-rule-for-nsf
+--rw i2nsf-security-policy* [name]
...
+--rw rules* [name]
| ...
| +--rw event
| ...
| +--rw condition
| ...
| +--rw action
| +--rw description? string
| +--rw packet-action
| | +--rw ingress-action? identityref
| | +--rw egress-action? identityref
| | +--rw log-action? identityref
| +--rw flow-action
| | +--rw ingress-action? identityref
| | +--rw egress-action? identityref
| | +--rw log-action? identityref
| +--rw advanced-action
| +--rw content-security-control* identityref
| +--rw attack-mitigation-control* identityref
+--rw rule-group
...
An action is used to control and monitor aspects of flow-based NSFs when the policy rule event and condition clauses are satisfied. NSFs provide security services by executing various actions. The action clause is defined as ingress action, egress action, or log action for packet action, flow action, and advanced action for additional inspection. The packet action is an action for an individual packet such as an IP datagram as a stateless process that uses the packet's header and payload. The flow action is an action of a traffic flow such as the packets of a TCP session (e.g., an HTTP/HTTPS session) as a stateful process that uses the traffic flow information such as 5-tuple information, packet counts, and byte counts. The advanced action is an action for an advanced security service (e.g., url filter, DDoS-attack mitigator, and VoIP/VoLTE filter) for either a packet or a traffic flow according to the intention of such an advanced security service. The action clause can be extended according to specific vendor action features. The action clause is described in detail in [I-D.ietf-i2nsf-capability-data-model].¶
The main objective of this data model is to provide both an information model and the corresponding YANG data model of I2NSF NSF-Facing Interface. This interface can be used to deliver control and management messages between Security Controller and NSFs for the I2NSF low-level security policies.¶
This data model is designed to support the I2NSF framework that can be extended according to the security needs. In other words, the model design is independent of the content and meaning of specific policies as well as the implementation approach.¶
With the YANG data model of I2NSF NSF-Facing Interface, this document suggests use cases for security policy rules such as time-based firewall, web filter, VoIP/VoLTE security service, and DDoS-attack mitigation in Section 5.¶
This section describes a YANG module of NSF-Facing Interface. This document provides identities in the data model for the configuration of an NSF. The identity has the same concept with the corresponding identity in [I-D.ietf-i2nsf-consumer-facing-interface-dm]. This YANG module imports from [RFC6991] and [RFC8519]. It makes references to [RFC0768] [RFC0791] [RFC0792] [RFC3261] [RFC4340] [RFC4443] [RFC4732] [RFC4987] [RFC4960] [RFC5595] [RFC6335] [RFC8075] [RFC8200] [RFC8329] [RFC8335] [IEEE-802.3] [ISO-3166] [I-D.ietf-tcpm-rfc793bis] [I-D.ietf-i2nsf-capability-data-model] [I-D.ietf-i2nsf-nsf-monitoring-data-model] [I-D.ietf-netmod-geo-location].¶
<CODE BEGINS> file "ietf-i2nsf-policy-rule-for-nsf@2022-01-28.yang"
module ietf-i2nsf-policy-rule-for-nsf {
yang-version 1.1;
namespace
"urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf";
prefix
nsfintf;
import ietf-inet-types{
prefix inet;
reference
"Section 4 of RFC 6991";
}
import ietf-yang-types {
prefix yang;
reference
"Section 3 of RFC 6991";
}
import ietf-packet-fields {
prefix packet-fields;
reference
"Section 4.2 of RFC 8519";
}
organization
"IETF I2NSF (Interface to Network Security Functions)
Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/i2nsf>
WG List: <mailto:i2nsf@ietf.org>
Editor: Jinyong Tim Kim
<mailto:timkim@skku.edu>
Editor: Jaehoon Paul Jeong
<mailto:pauljeong@skku.edu>";
description
"This module is a YANG module for Network Security Functions
(NSF)-Facing Interface.
The key words '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
(RFC 2119) (RFC 8174) when, and only when, they appear
in all capitals, as shown here.
Copyright (c) 2022 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
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
for full legal notices.";
revision "2022-01-28"{
description "The latest revision.";
reference
"RFC XXXX: I2NSF Network Security Function-Facing Interface
YANG Data Model";
}
/*
* Identities
*/
identity priority-usage {
description
"Base identity for priority usage type to define the type of
priority to be implemented in a security policy rule, such
as priority by order and priority by number.";
}
identity priority-by-order {
base priority-usage;
description
"Identity for priority by order. This indicates the
priority of a security policy rule follows the order of the
configuration. The earlier the configuration is, the higher
the priority is.";
}
identity priority-by-number {
base priority-usage;
description
"Identity for priority by number. This indicates the priority
of a security policy rule follows the number or value of the
configuration. The higher the value is, the higher the
priority is.";
}
identity event {
description
"Base identity for policy events.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - Event";
}
identity system-event {
base event;
description
"Identity for system events. System event (called alert) is
defined as a warning about any changes of configuration, any
access violation, the information of sessions and traffic
flows.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System event";
}
identity system-alarm {
base event;
description
"Identity for system alarms. System alarm is defined as a
warning related to service degradation in system hardware.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System alarm";
}
identity access-violation {
base system-event;
description
"Identity for access-violation. Access-violation system
event is an event when a user tries to access (read, write,
create, or delete) any information or execute commands
above their privilege (i.e., not-conformant with the
access profile).";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System event for access
violation";
}
identity configuration-change {
base system-event;
description
"Identity for configuration change. Configuration change is
a system event when a new configuration is added or an
existing configuration is modified.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System event for
configuration change";
}
identity memory-alarm {
base system-alarm;
description
"Identity for memory alarm. Memory is the hardware to store
information temporarily or for a short period, i.e., Random
Access Memory (RAM). A memory-alarm is emitted when the memory
usage is exceeding the threshold.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System alarm for memory";
}
identity cpu-alarm {
base system-alarm;
description
"Identity for CPU alarm. CPU is the Central Processing Unit
that executes basic operations of the system. A cpu-alarm
is emitted when the CPU usage is exceeding the threshold.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System alarm for CPU";
}
identity disk-alarm {
base system-alarm;
description
"Identity for disk alarm. Disk is the hardware to store
information for a long period, i.e., Hard Disk and Solid-State
Drive. A disk-alarm is emitted when the disk usage is
exceeding the threshold.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System alarm for disk";
}
identity hardware-alarm {
base system-alarm;
description
"Identity for hardware alarm. A hardware alarm is emitted
when a problem of hardware (e.g., CPU, memory, disk, or
interface) is detected.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System alarm for
hardware";
}
identity interface-alarm {
base system-alarm;
description
"Identity for interface alarm. Interface is the network
interface for connecting a device with the network. The
interface-alarm is emitted when the state of the interface
is changed.";
reference
"draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF NSF
Monitoring Interface YANG Data Model - System alarm for
interface";
}
identity device-type {
description
"Base identity for types of device. This identity is used for
type of the device for the destination of a packet or traffic
flow.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model";
}
identity computer {
base device-type;
description
"Identity for computer such as personal computer (PC)
and server.";
}
identity mobile-phone {
base device-type;
description
"Identity for mobile-phone such as smartphone and
cellphone";
}
identity voip-volte-phone {
base device-type;
description
"Identity for voip-volte-phone";
}
identity tablet {
base device-type;
description
"Identity for tablet devices";
}
identity network-infrastructure-device {
base device-type;
description
"Identity for network infrastructure devices
such as switch, router, and access point";
}
identity iot-device {
base device-type;
description
"Identity for IoT (Internet of Things) devices";
}
identity ot {
base device-type;
description
"Identity for Operational Technology (OT) devices (also
known as industrial control systems) that interact
with the physical environment and detect or cause direct
change through the monitoring and control of devices,
processes, and events such as programmable logic
controllers (PLCs), digital oscilloscopes, building
management systems (BMS), and fire control systems";
}
identity vehicle {
base device-type;
description
"Identity for transportation vehicles that connect to and
share data through the Internet over Vehicle-to-Everything
(V2X) communications.";
}
identity advanced-nsf {
description
"Base identity for advanced Network Security Function (NSF)
capability. This can be used for advanced NSFs such as
Anti-DDoS Attack, IPS, URL-Filtering, Antivirus,
and VoIP/VoLTE Filter.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model";
}
identity content-security-control {
base advanced-nsf;
description
"Base identity for content security control. Content security
control is an NSF that evaluates the payload of a packet,
such as Intrusion Prevention System (IPS), URL Filter,
Antivirus, and VoIP/VoLTE Filter.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model";
}
identity ips {
base content-security-control;
description
"Identity for IPS (Intrusion Prevention System)
that prevents malicious activity within a network";
}
identity url-filtering {
base content-security-control;
description
"Identity for url filtering that limits access by comparing the
web traffic's URL with the URLs for web filtering in a
database";
}
identity anti-virus {
base content-security-control;
description
"Identity for antivirus to protect the network by detecting and
removing viruses or malwares.";
}
identity voip-volte-filter {
base content-security-control;
description
"Identity for VoIP/VoLTE security service that filters out the
packets or flows of malicious users with a deny list of
malicious users in a database";
}
identity attack-mitigation-control {
base advanced-nsf;
description
"Base identity for attack mitigation control. Attack mitigation
control is an NSF that mitigates an attack such as
anti-DDoS (i.e., DDoS-mitigator).";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model";
}
identity anti-ddos {
base attack-mitigation-control;
description
"Identity for advanced NSF Anti-DDoS or DDoS Mitigator to
protect a server or network from a DDoS attack. The mitigation
approach is up to the implementation.";
reference
"RFC 4732: Internet Denial-of-Service Considerations - DoS
Mitigation Strategies
RFC 4987: TCP SYN Flooding Attacks and Common Mitigations -
Common Defenses";
}
identity action {
description
"Base identity for action.";
}
identity ingress-action {
base action;
description
"Base identity for ingress action. The action to handle the
network traffic that is entering the secured network.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Ingress Action";
}
identity egress-action {
base action;
description
"Base identity for egress action. The action to handle the
network traffic that is exiting the secured network.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Egress Action";
}
identity default-action {
base action;
description
"Base identity for default action. The default action of the
NSF when no rule matches the packet or flow.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Default Action";
}
identity pass {
base ingress-action;
base egress-action;
base default-action;
description
"Identity for pass. The pass action allows traffic that matches
the rule to proceed through the NSF to reach the
destination.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Actions and
Default Action";
}
identity drop {
base ingress-action;
base egress-action;
base default-action;
description
"Identity for drop. The drop action denies the traffic that
matches the rule. The drop action should do a silent drop,
which does not give any response to the source.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Actions and
Default Action";
}
identity reject {
base ingress-action;
base egress-action;
base default-action;
description
"Identity for reject action capability. The reject action
denies packet to go through the NSF entering or exiting the
internal network and send a response back to the source.
The response depends on the packet and implementation.
For example, a TCP packet is rejected with TCP RST response
or a UDP packet may be rejected with an ICMP response message
with Type 3 Code 3, i.e., Destination Unreachable: Destination
port unreachable.";
}
identity mirror {
base ingress-action;
base egress-action;
base default-action;
description
"Identity for mirror. The mirror action copies a packet and
sends the packet's copy to the monitoring entity while still
allowing the packet or flow to go through the NSF.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Actions and
Default Action";
}
identity rate-limit {
base ingress-action;
base egress-action;
base default-action;
description
"Identity for rate limiting action. The rate limit action
limits the number of packets or flows that can go through the
NSF by dropping packets or flows (randomly or
systematically). The drop mechanism, e.g., silent drop and
unreachable drop (i.e., reject), is up to the implementation";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Actions and
Default Action";
}
identity log-action {
base action;
description
"Base identity for log action";
}
identity rule-log {
base log-action;
description
"Identity for rule log. Log the received packet or flow based
on the rule.";
}
identity session-log {
base log-action;
description
"Identity for session log. Log the tasks that is performed
during a session.";
}
identity invoke-signaling {
base egress-action;
description
"Identity for invoke signaling. The invoke signaling action
is used to convey information of the event triggering this
action to a monitoring entity.";
}
identity tunnel-encapsulation {
base egress-action;
description
"Identity for tunnel encapsulation. The tunnel encapsulation
action is used to encapsulate the packet to be tunneled across
the network to enable a secure connection.";
}
identity forwarding {
base egress-action;
description
"Identity for forwarding. The forwarding action is used to
relay the packet from one network segment to another node
in the network.";
}
identity transformation {
base egress-action;
description
"Identity for transformation. The transformation action is used
to transform the packet by modifying its protocol header such
as HTTP-to-CoAP translation.";
reference
"RFC 8075: Guidelines for Mapping Implementations: HTTP to the
Constrained Application Protocol (CoAP) - Translation between
HTTP and CoAP.";
}
identity redirection {
base egress-action;
description
"Identity for redirection. This action redirects the packet to
another destination.";
}
identity resolution-strategy {
description
"Base identity for resolution strategy";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Resolution Strategy";
}
identity fmr {
base resolution-strategy;
description
"Identity for First Matching Rule (FMR)";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Resolution Strategy";
}
identity lmr {
base resolution-strategy;
description
"Identity for Last Matching Rule (LMR)";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Resolution Strategy";
}
identity pmr {
base resolution-strategy;
description
"Identity for Prioritized Matching Rule (PMR)";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Resolution Strategy";
}
identity pmre {
base resolution-strategy;
description
"Identity for Prioritized Matching Rule
with Errors (PMRE)";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Resolution Strategy";
}
identity pmrn {
base resolution-strategy;
description
"Identity for Prioritized Matching Rule with No Errors (PMRN)";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Resolution Strategy";
}
identity application-protocol {
description
"Base identity for Application protocol";
}
identity http {
base application-protocol;
description
"The identity for Hypertext Transfer Protocol.";
reference
"RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message
Syntax and Routing
RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics
and Content";
}
identity https {
base application-protocol;
description
"The identity for Hypertext Transfer Protocol Secure.";
reference
"RFC 2818: HTTP over TLS (HTTPS)
RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message
Syntax and Routing
RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics
and Content";
}
identity ftp {
base application-protocol;
description
"The identity for File Transfer Protocol.";
reference
"RFC 959: File Transfer Protocol (FTP)";
}
identity ssh {
base application-protocol;
description
"The identity for Secure Shell (SSH) protocol.";
reference
"RFC 4250: The Secure Shell (SSH) Protocol";
}
identity telnet {
base application-protocol;
description
"The identity for telnet.";
reference
"RFC 854: Telnet Protocol";
}
identity smtp {
base application-protocol;
description
"The identity for Simple Mail Transfer Protocol.";
reference
"RFC 5321: Simple Mail Transfer Protocol (SMTP)";
}
identity pop3 {
base application-protocol;
description
"The identity for Post Office Protocol 3. This includes
POP3 over TLS";
reference
"RFC 1939: Post Office Protocol - Version 3 (POP3)";
}
identity imap {
base application-protocol;
description
"The identity for Internet Message Access Protocol. This
includes IMAP over TLS";
reference
"RFC 9051: Internet Message Access Protocol (IMAP) - Version
4rev2";
}
/*
* Typedefs
*/
typedef time {
type string {
pattern '(0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](\.\d+)?'
+ '(Z|[\+\-]((1[0-3]|0[0-9]):([0-5][0-9])|14:00))?';
}
description
"The time type represents an instance of time of zero-duration
that recurs every day.";
}
typedef day {
type enumeration {
enum monday {
description
"This represents Monday.";
}
enum tuesday {
description
"This represents Tuesday.";
}
enum wednesday {
description
"This represents Wednesday";
}
enum thursday {
description
"This represents Thursday.";
}
enum friday {
description
"This represents Friday.";
}
enum saturday {
description
"This represents Saturday.";
}
enum sunday {
description
"This represents Sunday.";
}
}
description
"The type for representing the day of the week.";
}
/*
* Groupings
*/
grouping port-range {
leaf start {
type inet:port-number;
description
"Starting port number for a range match.";
}
leaf end {
type inet:port-number;
must '. >= ../start' {
error-message
"The end port number MUST be equal to or greater than the
start port number.";
}
description
"Ending port number for a range match.";
}
description
"Range match for the port numbers. If only one value is needed,
then set both start and end to the same value.";
reference
"draft-ietf-tcpm-rfc793bis-25: Transmission Control Protocol
(TCP) Specification - Port Number
RFC 768: User Datagram Protocol - Port Number
RFC 4960: Stream Control Transmission Protocol - Port Number
RFC 4340: Datagram Congestion Control Protocol (DCCP)
- Port Number";
}
/*
* Data nodes
*/
list i2nsf-security-policy {
key "name";
description
"Container for security policy
including a set of security rules according to certain logic,
i.e., their similarity or mutual relations, etc. The network
security policy can be applied to both the unidirectional
and bidirectional traffic across the NSF.
The I2NSF security policies use the Event-Condition-Action
(ECA) policy model ";
reference
"RFC 8329: Framework for Interface to Network Security
Functions - I2NSF Flow Security Policy Structure
draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Design Principles and
ECA Policy Model Overview";
leaf name {
type string;
description
"The name of the security policy.
This must be unique.";
}
leaf priority-usage {
type identityref {
base priority-usage;
}
default priority-by-order;
description
"Priority usage type for security policy rule:
priority by order and priority by number";
}
leaf resolution-strategy {
type identityref {
base resolution-strategy;
}
default fmr;
description
"The resolution strategies that can be used to
specify how to resolve conflicts that occur between
actions of the same or different policy rules that
are matched and contained in this particular NSF";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Resolution strategy";
}
leaf default-action {
type identityref {
base default-action;
}
default mirror;
description
"This default action can be used to specify a predefined
action when no other alternative action was matched
by the currently executing I2NSF Policy Rule. An analogy
is the use of a default statement in a C switch statement.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Default Action";
}
list rules {
key "name";
description
"This is a rule for network security functions.";
leaf name {
type string;
description
"The name of the rule.";
}
leaf description {
type string;
description
"This description gives more information about
rules.";
}
leaf priority {
type uint8 {
range "1..255";
}
description
"The priority for the rule comes with a mandatory
numeric value which can range from 1 up to 255.
Note that a higher number means a higher priority";
}
leaf enable {
type boolean;
description
"If true, the rule is enabled and enforced.
If false, the rule is configured but disabled and not
enforced.";
}
leaf session-aging-time {
type uint16;
units "second";
description
"This is session aging time.";
}
container long-connection {
description
"A container for long connection. A long connection is a
connection that is maintained after the socket connection
is established, regardless of whether it is used for data
traffic or not.";
leaf enable {
type boolean;
description
"If true, the rule is enabled and enforced.
If false, the rule is configured but disabled
and not enforced.";
}
leaf duration {
type uint16;
units "second";
description
"This is the duration of the long-connection.";
}
}
container event {
description
"An event is defined as any important
occurrence in time of a change in the system being
managed, and/or in the environment of the system being
managed. When used in the context of policy rules for
a flow-based NSF, it is used to determine whether the
Condition clause of the Policy Rule can be evaluated
or not. Examples of an I2NSF event include time and
user actions (e.g., logon, logoff, and actions that
violate any ACL.).";
reference
"RFC 8329: Framework for Interface to Network Security
Functions - I2NSF Flow Security Policy Structure
draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Design Principles and
ECA Policy Model Overview
draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF
NSF Monitoring YANG Data Model - Alarms, Events, Logs,
and Counters";
leaf description {
type string;
description
"Description for an event clause";
}
container time {
description
"Time to determine when the policy should be applied";
leaf start-date-time {
type yang:date-and-time;
description
"This is the start date and time for a security policy
rule.";
}
leaf end-date-time {
type yang:date-and-time;
description
"This is the end date and time for a policy rule. The
policy rule will stop working after the specified
end-date-time.";
}
container period {
when
"../frequency!='only-once'";
description
"This represents the repetition time. In the case
where the frequency is weekly, the days can be set.";
leaf start-time {
type time;
description
"This is a period's start time for an event.";
}
leaf end-time {
type time;
description
"This is a period's end time for an event.";
}
leaf-list day {
when
"../../frequency='weekly'";
type day;
min-elements 1;
description
"This represents the repeated day of every week
(e.g., Monday and Tuesday). More than one day can
be specified.";
}
leaf-list date {
when
"../../frequency='monthly'";
type int8 {
range "1..31";
}
min-elements 1;
description
"This represents the repeated date of every month.
More than one date can be specified.";
}
leaf-list month {
when
"../../frequency='yearly'";
type string{
pattern '\d{2}-\d{2}';
}
min-elements 1;
description
"This represents the repeated date and month of every
year. More than one can be specified. A pattern
used here is Month and Date (MM-DD).";
}
}
leaf frequency {
type enumeration {
enum only-once {
description
"This represents that the rule is immediately
enforcedonly once and not repeated. The policy
will continuously be active from the start-time
to the end-time.";
}
enum daily {
description
"This represents that the rule is enforced on a
daily basis. The policy will be repeated
daily until the end-date.";
}
enum weekly {
description
"This represents that the rule is enforced on a
weekly basis. The policy will be repeated weekly
until the end-date. The repeated days can be
specified.";
}
enum monthly {
description
"This represents that the rule is enforced on a
monthly basis. The policy will be repeated monthly
until the end-date.";
}
enum yearly {
description
"This represents that the rule is enforced on
a yearly basis. The policy will be repeated
yearly until the end-date.";
}
}
default only-once;
description
"This represents how frequently the rule
should be enforced.";
}
}
container event-clauses {
description
"Event Clause - either a system event or
system alarm";
reference
"RFC 8329: Framework for Interface to Network Security
Functions - I2NSF Flow Security Policy Structure
draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Design Principles and
ECA Policy Model Overview
draft-ietf-i2nsf-nsf-monitoring-data-model-13: I2NSF
NSF Monitoring YANG Data Model - Alarms, Events, Logs,
and Counters";
leaf-list system-event {
type identityref {
base system-event;
}
description
"The security policy rule according to
system events.";
}
leaf-list system-alarm {
type identityref {
base system-alarm;
}
description
"The security policy rule according to
system alarms.";
}
}
}
container condition {
description
"A condition is defined as a set
of attributes, features, and/or values that are to be
compared with a set of known attributes, features,
and/or values in order to determine whether or not the
set of Actions in that (imperative) I2NSF Policy Rule
can be executed or not. Examples of I2NSF Conditions
include matching attributes of a packet or flow, and
comparing the internal state of an NSF to a desired
state.";
reference
"RFC 8329: Framework for Interface to Network Security
Functions - I2NSF Flow Security Policy Structure
draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Design Principles and
ECA Policy Model Overview";
leaf description {
type string;
description
"Description for a condition clause.";
}
container ethernet {
description
"The purpose of this container is to represent layer 2
packet header information to determine the set of policy
actions in this ECA policy rule should be executed or
not.";
reference
"IEEE 802.3: IEEE Standard for Ethernet";
leaf description {
type string;
description
"The ethernet condition description";
}
uses packet-fields:acl-eth-header-fields;
}
container ipv4 {
description
"The purpose of this container is to represent IPv4
packet header information to determine if the set
of policy actions in this ECA policy rule should be
executed or not.";
reference
"RFC 791: Internet Protocol";
leaf description {
type string;
description
"ipv4 condition textual description.";
}
uses packet-fields:acl-ip-header-fields;
uses packet-fields:acl-ipv4-header-fields;
}
container ipv6 {
description
"The purpose of this container is to represent
IPv6 packet header information to determine
if the set of policy actions in this ECA policy
rule should be executed or not.";
reference
"RFC 8200: Internet Protocol, Version 6 (IPv6)
Specification";
leaf description {
type string;
description
"This is description for ipv6 condition.";
}
uses packet-fields:acl-ip-header-fields;
uses packet-fields:acl-ipv6-header-fields;
}
container tcp {
description
"The purpose of this container is to represent
TCP packet header information to determine
if the set of policy actions in this ECA policy
rule should be executed or not.";
reference
"draft-ietf-tcpm-rfc793bis-25: Transmission Control
Protocol (TCP) Specification";
leaf description {
type string;
description
"This is description for tcp condition.";
}
container source-port-number {
choice source-port {
case range-or-operator {
uses packet-fields:port-range-or-operator;
description
"Source port definition from range or operator.
Can be used when a single port range to be
specified.";
}
case port-list {
list port-numbers {
key "start";
uses port-range;
description
"List of source port numbers.";
}
description
"Source port definition from list of port numbers.
In the case of multiple port ranges needed to be
specified.";
}
description
"The choice of source port definition using
range/operator or a choice to use list of port
numbers.";
}
description
"The security policy rule according to
tcp source port number.";
reference
"draft-ietf-tcpm-rfc793bis-25: Transmission Control
Protocol (TCP) Specification - Port Number";
}
container destination-port-number {
choice destination-port {
case range-or-operator {
uses packet-fields:port-range-or-operator;
description
"Destination port definition from range or
operator.
Can be used when a single port range to be
specified.";
}
case port-list {
list port-numbers {
key "start";
uses port-range;
description
"List of destination port numbers.";
}
description
"Destination port definition from list of port
numbers.
In the case of multiple port ranges needed to be
specified.";
}
description
"The choice of destination port definition using
range/operator or a choice to use list of port
numbers.";
}
description
"The security policy rule according to
tcp destination port number.";
reference
"draft-ietf-tcpm-rfc793bis-25: Transmission Control
Protocol (TCP) Specification - Port Number";
}
uses packet-fields:acl-tcp-header-fields;
}
container udp {
description
"The purpose of this container is to represent
UDP packet header information to determine
if the set of policy actions in this ECA policy
rule should be executed or not.";
reference
"RFC 768: User Datagram Protocol";
leaf description {
type string;
description
"This is description for udp condition.";
}
container source-port-number {
choice source-port {
case range-or-operator {
uses packet-fields:port-range-or-operator;
description
"Source port definition from range or operator.
Can be used when a single port range to be
specified.";
}
case port-list {
list port-numbers {
key "start";
uses port-range;
description
"List of source port numbers.";
}
description
"Source port definition from list of port numbers.
In the case of multiple port ranges needed to be
specified.";
}
description
"The choice of source port definition using
range/operator or a choice to use list of port
numbers.";
}
description
"The security policy rule according to
udp source port number.";
reference
"RFC 768: User Datagram Protocol - Port Number";
}
container destination-port-number {
choice destination-port {
case range-or-operator {
uses packet-fields:port-range-or-operator;
description
"Destination port definition from range or
operator.
Can be used when a single port range to be
specified.";
}
case port-list {
list port-numbers {
key "start";
uses port-range;
description
"List of destination port numbers.";
}
description
"Destination port definition from list of port
numbers.
In the case of multiple port ranges needed to be
specified.";
}
description
"The choice of destination port definition using
range/operator or a choice to use list of port
numbers.";
}
description
"The security policy rule according to
udp destination port number.";
reference
"RFC 768: User Datagram Protocol - Port Number";
}
uses packet-fields:acl-udp-header-fields;
}
container sctp {
description
"The purpose of this container is to represent
SCTP packet header information to determine
if the set of policy actions in this ECA policy
rule should be executed or not.";
leaf description {
type string;
description
"This is description for sctp condition.";
}
container source-port-number {
choice source-port {
case range-or-operator {
uses packet-fields:port-range-or-operator;
description
"Source port definition from range or operator.
Can be used when a single port range to be
specified.";
}
case port-list {
list port-numbers {
key "start";
uses port-range;
description
"List of source port numbers.";
}
description
"Source port definition from list of port numbers.
In the case of multiple port ranges needed to be
specified.";
}
description
"The choice of source port definition using
range/operator or a choice to use list of port
numbers.";
}
description
"The security policy rule according to
sctp source port number.";
reference
"RFC 4960: Stream Control Transmission Protocol
- Port number";
}
container destination-port-number {
choice destination-port {
case range-or-operator {
uses packet-fields:port-range-or-operator;
description
"Destination port definition from range or
operator.
Can be used when a single port range to be
specified.";
}
case port-list {
list port-numbers {
key "start";
uses port-range;
description
"List of destination port numbers.";
}
description
"Destination port definition from list of port
numbers.
In the case of multiple port ranges needed to be
specified.";
}
description
"The choice of destination port definition using
range/operator or a choice to use list of port
numbers.";
}
description
"The security policy rule according to
sctp destination port number.";
reference
"RFC 4960: Stream Control Transmission Protocol
- Port Number";
}
leaf-list chunk-type {
type uint8;
description
"The security policy rule according to
sctp chunk type ID Value.";
reference
"RFC 4960: Stream Control Transmission Protocol
- Chunk Type";
}
}
container dccp {
description
"The purpose of this container is to represent
DCCP packet header information to determine
if the set of policy actions in this ECA policy
rule should be executed or not.";
leaf description {
type string;
description
"This is description for dccp condition.";
}
container source-port-number {
choice source-port {
case range-or-operator {
uses packet-fields:port-range-or-operator;
description
"Source port definition from range or operator.
Can be used when a single port range to be
specified.";
}
case port-list {
list port-numbers {
key "start";
uses port-range;
description
"List of source port numbers.";
}
description
"Source port definition from list of port numbers.
In the case of multiple port ranges needed to be
specified.";
}
description
"The choice of source port definition using
range/operator or a choice to use list of port
numbers.";
}
description
"The security policy rule according to
dccp source port number.";
reference
"RFC 4340: Datagram Congestion Control Protocol (DCCP)
- Port number";
}
container destination-port-number {
choice destination-port {
case range-or-operator {
uses packet-fields:port-range-or-operator;
description
"Destination port definition from range or
operator.
Can be used when a single port range to be
specified.";
}
case port-list {
list port-numbers {
key "start";
uses port-range;
description
"List of destination port numbers.";
}
description
"Destination port definition from list of port
numbers.
In the case of multiple port ranges needed to be
specified.";
}
description
"The choice of destination port definition using
range/operator or a choice to use list of port
numbers.";
}
description
"The security policy rule according to
dccp destination port number.";
reference
"RFC 4340: Datagram Congestion Control Protocol (DCCP)
- Port number";
}
leaf-list service-code {
type uint32;
description
"The security policy rule according to
dccp service code.";
reference
"RFC 4340: Datagram Congestion Control Protocol (DCCP)
- Service Codes
RFC 5595: The Datagram Congestion Control Protocol
(DCCP) Service Codes
RFC 6335: Internet Assigned Numbers Authority (IANA)
Procedures for the Management of the Service
Name and Transport Protocol Port Number
Registry - Service Code";
}
leaf-list type {
type uint8 {
range "0..15";
}
description
"The security policy rule according to the 4 bits of
dccp type header field for dccp packet types such as
DCCP-Request, DCCP-Response, DCCP-Data, DCCP-Ack, and
DCCP-DataAck.";
reference
"RFC 4340: Datagram Congestion Control Protocol (DCCP)
- Packet Types";
}
}
list icmp {
key "version";
description
"The purpose of this container is to represent
ICMP packet header information to determine
if the set of policy actions in this ECA policy
rule should be executed or not.";
reference
"RFC 792: Internet Control Message Protocol
RFC 8335: PROBE: A Utility for Probing Interfaces";
leaf description {
type string;
description
"This is description for icmp condition.";
}
leaf version {
type enumeration {
enum icmpv4 {
value "1";
description
"The ICMPv4 Protocol as defined in RFC 792";
}
enum icmpv6 {
value "2";
description
"The ICMPv6 Protocol as defined in RFC 4443";
}
}
description
"The ICMP version to be matched. This value
affected the type and code values.";
reference
"RFC 792: Internet Control Message Protocol
RFC 4443: Internet Control Message Protocol (ICMPv6)
for the Internet Protocol Version 6 (IPv6)
Specification";
}
uses packet-fields:acl-icmp-header-fields;
}
container url-category {
description
"Condition for url category";
leaf description {
type string;
description
"This is description for the condition of a URL's
category such as SNS sites, game sites, ecommerce
sites, company sites, and university sites.";
}
leaf-list pre-defined {
type string;
description
"This is pre-defined-category. To specify the name of
URL database.";
}
leaf-list user-defined {
type string;
description
"This user-defined-category. To allow a users manual
addition of URLs for URL filtering.";
}
}
container voice {
description
"For the VoIP/VoLTE security system, a VoIP/
VoLTE security system can monitor each
VoIP/VoLTE flow and manage VoIP/VoLTE
security rules controlled by a centralized
server for VoIP/VoLTE security service
(called VoIP IPS). The VoIP/VoLTE security
system controls each switch for the
VoIP/VoLTE call flow management by
manipulating the rules that can be added,
deleted, or modified dynamically.";
reference
"RFC 3261: SIP: Session Initiation Protocol";
leaf description {
type string;
description
"This is description for voice condition.";
}
leaf-list source-voice-id {
type string;
description
"The security policy rule according to
a source voice ID for VoIP and VoLTE.";
}
leaf-list destination-voice-id {
type string;
description
"The security policy rule according to
a destination voice ID for VoIP and VoLTE.";
}
leaf-list user-agent {
type string;
description
"The security policy rule according to
an user agent for VoIP and VoLTE.";
}
}
container ddos {
description
"Condition for DDoS attack.";
leaf description {
type string;
description
"This is description for ddos condition.";
}
leaf alert-packet-rate {
type uint32;
units "pps";
description
"The alert rate of flood detection for
packets per second (PPS) of an IP address.
If the PPS of an IP address exceeds
the alert rate threshold, an alert
will be generated.";
}
leaf alert-flow-rate {
type uint32;
description
"The alert rate of flood detection for
flows per second of an IP address.
If the flows per second of an IP address
exceeds the alert rate threshold, an alert
will be generated.";
}
leaf alert-byte-rate {
type uint32;
units "Bps";
description
"The alert rate of flood detection for
bytes per second (Bps) of an IP address.
If the bytes per second of an IP address
exceeds the alert rate threshold, an alert
will be generated.";
}
}
container anti-virus {
description
"Condition for antivirus";
leaf-list profile {
type string;
description
"The security profile for antivirus. This is used to
update the security profile for improving the
security. The security profile is used to scan
the viruses.";
}
leaf-list exception-files {
type string;
description
"The type or name of the files to be excluded by the
anti-virus. This can be used to keep the known
harmless files.";
}
}
container payload {
description
"Condition for packet payload";
leaf description {
type string;
description
"This is description for payload condition.";
}
leaf-list content {
type string;
description
"This is a condition for packet payload content.";
}
}
container context {
description
"Condition for context";
leaf description {
type string;
description
"This is description for context condition.";
}
container application {
description
"Condition for application";
leaf description {
type string;
description
"This is description for application condition.";
}
leaf-list protocol {
type identityref {
base application-protocol;
}
description
"The condition based on the application layer
protocol";
}
}
container device-type {
description
"Condition for type of the destination device";
leaf description {
type string;
description
"This is description for destination device type
condition. Vendors can write instructions for the
condition that vendor made";
}
leaf-list device {
type identityref {
base device-type;
}
description
"The device attribute that can identify a device,
including the device type (i.e., router, switch,
pc, ios, or android) and the device's owner as
well.";
}
}
container users {
description
"Condition for users";
leaf description {
type string;
description
"This is the description for users' condition.";
}
list user {
key "id";
description
"The user with which the traffic flow is associated
can be identified by either a user id or user name.
The user-to-IP address mapping is assumed to be
provided by the unified user management system via
network.";
leaf id {
type uint32;
description
"The ID of the user.";
}
leaf name {
type string;
description
"The name of the user.";
}
}
list group {
key "id";
description
"The user group with which the traffic flow is
associated can be identified by either a group id
or group name. The group-to-IP address and
user-to-group mappings are assumed to be provided by
the unified user management system via network.";
leaf id {
type uint32;
description
"The ID of the group.";
}
leaf name {
type string;
description
"The name of the group.";
}
}
leaf security-group {
type string;
description
"security-group.";
}
}
container geographic-location {
description
"The location which network traffic flow is associated
with. The region can be the geographic location such
as country, province, and city, as well as the logical
network location such as IP address, network section,
and network domain.";
reference
"draft-ietf-netmod-geo-location-11: A YANG Grouping for
Geographic Locations";
leaf description {
type string;
description
"This is the description for the geographic location
condition. It is used to describe the conditions and
instructions that should be implemented.";
}
leaf-list source {
type string;
description
"The source is a geographic location mapped into an
IP address. It matches the mapped IP address to the
source IP address of the traffic flow.";
reference
"ISO 3166: Codes for the representation of
names of countries and their subdivisions
draft-ietf-netmod-geo-location-11: A YANG Grouping
for Geographic Locations";
}
leaf-list destination {
type string;
description
"The destination is a geographic location mapped into
an IP address. It matches the mapped IP address to
the destination IP address of the traffic flow.";
reference
"ISO 3166: Codes for the representation of
names of countries and their subdivisions
draft-ietf-netmod-geo-location-11: A YANG Grouping
for Geographic Locations";
}
}
}
}
container action {
description
"An action is used to control and monitor aspects of
flow-based NSFs when the event and condition clauses
are satisfied. NSFs provide security functions by
executing various Actions. Examples of I2NSF Actions
include providing intrusion detection and/or protection,
web and flow filtering, and deep packet inspection
for packets and flows.";
reference
"RFC 8329: Framework for Interface to Network Security
Functions - I2NSF Flow Security Policy Structure
draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Design Principles and
ECA Policy Model Overview";
leaf description {
type string;
description
"Description for an action clause.";
}
container packet-action {
description
"Action for packets";
reference
"RFC 8329: Framework for Interface to Network Security
Functions - I2NSF Flow Security Policy Structure
draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Design Principles and
ECA Policy Model Overview";
leaf ingress-action {
type identityref {
base ingress-action;
}
description
"Ingress Action: pass, drop, rate-limit, and
mirror.";
}
leaf egress-action {
type identityref {
base egress-action;
}
description
"Egress action: pass, drop, rate-limit, mirror,
invoke-signaling, tunnel-encapsulation, forwarding,
and redirection.";
}
leaf log-action {
type identityref {
base log-action;
}
description
"Log action: rule log and session log";
}
}
container flow-action {
description
"Action for flows";
reference
"RFC 8329: Framework for Interface to Network Security
Functions - I2NSF Flow Security Policy Structure
draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - Design Principles and
ECA Policy Model Overview";
leaf ingress-action {
type identityref {
base ingress-action;
}
description
"Action: pass, drop, rate-limit, and mirror.";
}
leaf egress-action {
type identityref {
base egress-action;
}
description
"Egress action: pass, drop, rate-limit, mirror,
invoke-signaling, tunnel-encapsulation, forwarding,
and redirection.";
}
leaf log-action {
type identityref {
base log-action;
}
description
"Log action: rule log and session log";
}
}
container advanced-action {
description
"If the packet needs to be additionally inspected,
the packet is passed to advanced network
security functions according to the profile.
The profile means the types of NSFs where the packet
will be forwarded in order to additionally
inspect the packet.
The advanced action activates Service Function
Chaining (SFC) for further inspection of a packet.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - YANG Tree
Diagram";
leaf-list content-security-control {
type identityref {
base content-security-control;
}
description
"Content-security-control is the NSFs that
inspect the payload of the packet.
The profile for the types of NSFs for mitigation is
divided into content security control and
attack-mitigation-control.
Content security control: ips, url filtering,
anti-virus, and voip-volte-filter. This can be
extended according to the provided NSFs.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - YANG Tree Diagram";
}
leaf-list attack-mitigation-control {
type identityref {
base attack-mitigation-control;
}
description
"Attack-mitigation-control is the NSFs that weaken
the attacks related to a denial of service
and reconnaissance.
The profile for the types of NSFs for mitigation is
divided into content security control and
attack-mitigation-control.
Attack mitigation control: Anti-DDoS or DDoS
mitigator. This can be extended according to the
provided NSFs such as mitigators for ip sweep,
port scanning, ping of death, teardrop, oversized
icmp, and tracert.";
reference
"draft-ietf-i2nsf-capability-data-model-22:
I2NSF Capability YANG Data Model - YANG Tree Diagram";
}
}
}
}
container rule-group {
description
"This is rule group";
list groups {
key "name";
description
"This is a group for rules";
leaf name {
type string;
description
"This is the name of the group for rules";
}
leaf-list rule-name {
type leafref {
path
"../../../rules/name";
}
description
"The names of the rules to be grouped.";
}
leaf enable {
type boolean;
description
"If true, the rule is enabled and enforced.
If false, the rule is configured but disabled
and not enforced.";
}
leaf description {
type string;
description
"This is a description for rule-group";
}
}
}
}
}
<CODE ENDS>
This section shows XML configuration examples of low-level security policy rules that are delivered from the Security Controller to NSFs over the NSF-Facing Interface. For security requirements, we assume that the NSFs (i.e., General firewall, Time-based firewall, URL filter, VoIP/VoLTE filter, and http and https flood mitigation) described in Appendix A of [I-D.ietf-i2nsf-capability-data-model] are registered with the I2NSF framework. With the registered NSFs, we show configuration examples for security policy rules of network security functions according to the following three security requirements: (i) Block Social Networking Service (SNS) access during business hours, (ii) Block malicious VoIP/VoLTE packets coming to the company, and (iii) Mitigate http and https flood attacks on company web server.¶
This section shows a configuration example for blocking SNS access during business hours in IPv4 networks or IPv6 networks.¶
<i2nsf-security-policy
xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf">
<name>sns_access</name>
<rules>
<name>block_sns_access_during_operation_time</name>
<event>
<time>
<start-date-time>2021-03-11T09:00:00.00Z</start-date-time>
<end-date-time>2021-12-31T18:00:00.00Z</end-date-time>
<period>
<start-time>09:00:00Z</start-time>
<end-time>18:00:00Z</end-time>
<day>monday</day>
<day>tuesday</day>
<day>wednesday</day>
<day>thursday</day>
<day>friday</day>
</period>
<frequency>weekly</frequency>
</time>
</event>
<condition>
<ipv4>
<source-ipv4-network>192.0.2.0/24</source-ipv4-network>
</ipv4>
</condition>
<action>
<advanced-action>
<content-security-control>
url-filtering
</content-security-control>
</advanced-action>
</action>
</rules>
</i2nsf-security-policy>
<i2nsf-security-policy
xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf">
<name>sns_access</name>
<rules>
<name>block_sns_access_during_operation_time</name>
<event>
<time>
<start-date-time>2021-03-11T09:00:00.00Z</start-date-time>
<end-date-time>2021-12-31T18:00:00.00Z</end-date-time>
<period>
<start-time>09:00:00Z</start-time>
<end-time>18:00:00Z</end-time>
<day>monday</day>
<day>tuesday</day>
<day>wednesday</day>
<day>thursday</day>
<day>friday</day>
</period>
<frequency>weekly</frequency>
</time>
</event>
<condition>
<ipv6>
<source-ipv6-network>2001:db8:0:1::0/120</source-ipv6-network>
</ipv6>
</condition>
<action>
<advanced-action>
<content-security-control>
url-filtering
</content-security-control>
</advanced-action>
</action>
</rules>
</i2nsf-security-policy>
<i2nsf-security-policy
xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf">
<name>sns_access</name>
<rules>
<name>block_sns_access_during_operation_time</name>
<condition>
<url-category>
<user-defined>SNS_1</user-defined>
<user-defined>SNS_2</user-defined>
</url-category>
</condition>
<action>
<packet-action>
<egress-action>drop</egress-action>
</packet-action>
</action>
</rules>
</i2nsf-security-policy>
Figure 6 (or Figure 7) and Figure 8 show the configuration XML documents for time-based firewall and web filter to block SNS access during business hours in IPv4 networks (or IPv6 networks). For the security requirement, two NSFs (i.e., a time-based firewall and a web filter) were used because one NSF cannot meet the security requirement. The instances of XML documents for the time-based firewall and the web filter are as follows: Note that a detailed data model for the configuration of the advanced network security function (i.e., web filter) can be defined as an extension in future.¶
Time-based Firewall is as follows:¶
Web Filter is as follows:¶
This section shows a configuration example for blocking malicious VoIP/VoLTE packets coming to a company.¶
<i2nsf-security-policy
xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf">
<name>voip_volte_inspection</name>
<rules>
<name>block_malicious_voice_id</name>
<condition>
<ipv4>
<destination-ipv4-network>192.0.2.0/24</destination-ipv4-network>
</ipv4>
<tcp>
<destination-port-number>
<lower-port>5060</lower-port>
<upper-port>5061</upper-port>
</destination-port-number>
</tcp>
</condition>
<action>
<advanced-action>
<content-security-control>
voip-volte-filter
</content-security-control>
</advanced-action>
</action>
</rules>
</i2nsf-security-policy>
<i2nsf-security-policy
xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf">
<name>voip_volte_inspection</name>
<rules>
<name>block_malicious_voice_id</name>
<condition>
<voice>
<source-voice-id>
user1@voip.malicious.example.com
</source-voice-id>
<source-voice-id>
user2@voip.malicious.example.com
</source-voice-id>
</voice>
</condition>
<action>
<flow-action>
<ingress-action>drop</ingress-action>
</flow-action>
</action>
</rules>
</i2nsf-security-policy>
Figure 9 and Figure 10 show the configuration XML documents for general firewall and VoIP/VoLTE filter to block malicious VoIP/VoLTE packets coming to a company. For the security requirement, two NSFs (i.e., a general firewall and a VoIP/VoLTE filter) were used because one NSF can not meet the security requirement. The instances of XML documents for the general firewall and the VoIP/VoLTE filter are as follows: Note that a detailed data model for the configuration of the advanced network security function (i.e., VoIP/VoLTE filter) can be described as an extension in future.¶
General Firewall is as follows:¶
VoIP/VoLTE Filter is as follows:¶
This section shows a configuration example for mitigating http and https flood attacks on a company web server.¶
<i2nsf-security-policy
xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf">
<name>flood_attack_mitigation</name>
<rules>
<name>mitigate_http_and_https_flood_attack</name>
<condition>
<ipv4>
<destination-ipv4-network>192.0.2.0/24</destination-ipv4-network>
</ipv4>
<tcp>
<destination-port-number>
<port-numbers>
<start>80</start>
<end>80</end>
</port-numbers>
<port-numbers>
<start>443</start>
<end>443</end>
</port-numbers>
</destination-port-number>
</tcp>
</condition>
<action>
<advanced-action>
<attack-mitigation-control>
anti-ddos
</attack-mitigation-control>
</advanced-action>
</action>
</rules>
</i2nsf-security-policy>
<i2nsf-security-policy
xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf">
<name>flood_attack_mitigation</name>
<rules>
<name>mitigate_http_and_https_flood_attack</name>
<condition>
<ddos>
<alert-packet-rate>1000</alert-packet-rate>
</ddos>
</condition>
<action>
<flow-action>
<ingress-action>drop</ingress-action>
</flow-action>
</action>
</rules>
</i2nsf-security-policy>
Figure 11 and Figure 12 show the configuration XML documents for general firewall and http and https flood attack mitigation to mitigate http and https flood attacks on a company web server. For the security requirement, two NSFs (i.e., a general firewall and a http and https flood attack mitigation) were used because one NSF can not meet the security requirement. The instances of XML documents for the general firewall and http and https flood attack mitigation are as follows: Note that a detailed data model for the configuration of the advanced network security function (i.e., http and https flood attack mitigation) can be defined as an extension in future.¶
General Firewall is as follows:¶
Anti DDoS for HTTP and HTTPS Flood Attack Mitigation is as follows:¶
This document requests IANA to register the following URI in the "IETF XML Registry" [RFC3688]:¶
URI: urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace.¶
This document requests IANA to register the following YANG module in the "YANG Module Names" registry [RFC7950][RFC8525]:¶
name: ietf-i2nsf-policy-rule-for-nsf namespace: urn:ietf:params:xml:ns:yang:ietf-i2nsf-policy-rule-for-nsf prefix: nsfintf reference: RFC XXXX¶
The YANG module specified in this document defines a data schema designed to be accessed through network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the required secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the required secure transport is TLS [RFC8446].¶
The NETCONF access control model [RFC8341] provides a means of restricting access to specific NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content.¶
There are a number of data nodes defined in this YANG module that 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:¶
Some of the readable data nodes in this YANG module 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:¶
Policy rules identifying the specified users and user groups can be specified with "rules/condition/context/users". As with other data in this YANG module, this user information is provided by the Security Controller to the NSFs and is protected via the transport and access control mechanisms described above.¶
This document is a product by the I2NSF Working Group (WG) including WG Chairs (i.e., Linda Dunbar and Yoav Nir) and Diego Lopez. This document took advantage of the review and comments from the following people: Roman Danyliw, Acee Lindem, Dan Romascanu (GenART), Yoshifumi Nishida (TSVART), Kyle Rose (SecDir), Joe Clarke (OpsDir), and Tom Petch. We authors sincerely appreciate their sincere efforts and kind help.¶
This work was supported by Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korea MSIT (Ministry of Science and ICT) (R-20160222-002755, Cloud based Security Intelligence Technology Development for the Customized Security Service Provisioning). This work was supported in part by the IITP (2020-0-00395, Standard Development of Blockchain based Network Management Automation Technology).¶
The following are co-authors of this document:¶
Patrick Lingga - Department of Electrical and Computer Engineering, Sungkyunkwan University, 2066 Seobu-ro Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea, EMail: patricklink@skku.edu¶
Hyoungshick Kim - Department of Computer Science and Engineering, Sungkyunkwan University, 2066 Seobu-ro Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea, EMail: hyoung@skku.edu¶
Daeyoung Hyun - Department of Computer Science and Engineering, Sungkyunkwan University, 2066 Seobu-ro Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea, EMail: dyhyun@skku.edu¶
Dongjin Hong - Department of Electronic, Electrical and Computer Engineering, Sungkyunkwan University, 2066 Seobu-ro Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea, EMail: dong.jin@skku.edu¶
Liang Xia - Huawei, 101 Software Avenue, Nanjing, Jiangsu 210012, China, EMail: Frank.Xialiang@huawei.com¶
Tae-Jin Ahn - Korea Telecom, 70 Yuseong-Ro, Yuseong-Gu, Daejeon, 305-811, Republic of Korea, EMail: taejin.ahn@kt.com¶
Se-Hui Lee - Korea Telecom, 70 Yuseong-Ro, Yuseong-Gu, Daejeon, 305-811, Republic of Korea, EMail: sehuilee@kt.com¶