draft-ietf-dnsext-zone-status-02.txt   draft-ietf-dnsext-zone-status-03.txt 
DNSEXT WG Edward Lewis DNSEXT WG Edward Lewis
INTERNET DRAFT NAI Labs INTERNET DRAFT NAI Labs
Category:I-D July 12, 2000 Category:I-D September 19, 2000
DNS Security Extension Clarification on Zone Status DNS Security Extension Clarification on Zone Status
<draft-ietf-dnsext-zone-status-02.txt> <draft-ietf-dnsext-zone-status-03.txt>
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with all This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026. provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Task Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF), its areas, and its working groups. Note that other Force (IETF), its areas, and its working groups. Note that other
groups may also distribute working documents as Internet-Drafts. groups may also distribute working documents as Internet-Drafts.
skipping to change at line 28 skipping to change at line 28
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
Comments should be sent to the authors or the DNSIND WG mailing list Comments should be sent to the authors or the DNSEXT WG mailing list
namedroppers@internic.net. namedroppers@ops.ietf.org.
This draft expires on January 12, 2001. This draft expires on March, 19, 2001.
Copyright Notice Copyright Notice
Copyright (C) The Internet Society (1999, 2000). All rights reserved. Copyright (C) The Internet Society (1999, 2000). All rights reserved.
Abstract Abstract
The definition of a secured zone is presented, updating RFC 2535. The definition of a secured zone is presented, clarifying and updating
After discussion on the mailing list and other working group sections of RFC 2535. RFC 2535 defines a zone to be secured based on a
consideration, removed from earlier editions of this draft are a new per algorithm basis, e.g., a zone can be secured with RSA keys, and
interpretation of the NXT record and a proposal to obsolete NULL not secured with DSA keys. This document changes this to define a
keys. Deprecation of "experimentally secure" remains. zone to be secured or not secured regardless of the key algorithm used
(or not used). To further simplify the determination of a zone's
status, "experimentally secure" status is deprecated.
1 Introduction 1 Introduction
Whether a DNS zone is "secured" or not is a question asked in at least Whether a DNS zone is "secured" or not is a question asked in at least
four contexts. A zone administrator asks the question when four contexts. A zone administrator asks the question when
configuring a zone to use DNSSEC. A dynamic update server asks the configuring a zone to use DNSSEC. A dynamic update server asks the
question when an update request arrives, which may require DNSSEC question when an update request arrives, which may require DNSSEC
processing. A delegating zone asks the question of a child zone when processing. A delegating zone asks the question of a child zone when
the parent enters data indicating the status the child. A resolver the parent enters data indicating the status the child. A resolver
asks the question upon receipt of data belonging to the zone. asks the question upon receipt of data belonging to the zone.
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1.1 When a Zone's Status is Important 1.1 When a Zone's Status is Important
A zone administrator needs to be able to determine what steps are A zone administrator needs to be able to determine what steps are
needed to make the zone as secure as it can be. Realizing that due to needed to make the zone as secure as it can be. Realizing that due to
the distributed nature of DNS and its administration, any single zone the distributed nature of DNS and its administration, any single zone
is at the mercy of other zones when it comes to the appearance of is at the mercy of other zones when it comes to the appearance of
security. This document will define what makes a zone qualify as security. This document will define what makes a zone qualify as
secure (absent interaction with other zones). secure.
A name server performing dynamic updates needs to know whether a zone A name server performing dynamic updates needs to know whether a zone
being updated is to have signatures added to the updated data, NXT being updated is to have signatures added to the updated data, NXT
records applied, and other required processing. In this case, it is records applied, and other required processing. In this case, it is
conceivable that the name server is configured with the knowledge, but conceivable that the name server is configured with the knowledge, but
being able to determine the status of a zone by examining the data is being able to determine the status of a zone by examining the data is
a desirable alternative to configuration parameters. a desirable alternative to configuration parameters.
A delegating zone is required to indicate whether a child zone is A delegating zone is required to indicate whether a child zone is
secured. The reason for this requirement lies in the way in which a secured. The reason for this requirement lies in the way in which a
resolver makes its own determination about a zone (next paragraph). To resolver makes its own determination about a zone (next paragraph). To
shorten a long story, a parent needs to know whether a child should be shorten a long story, a parent needs to know whether a child should be
considered secured. This is a two part question, what does a parent considered secured. This is a two part question. Under what
consider a secure child to be, and how does a parent know if the child circumstances does a parent consider a child zone to be secure, and
conforms? how does a parent know if the child conforms?
A resolver needs to know if a zone is secured when the resolver is A resolver needs to know if a zone is secured when the resolver is
processing data from the zone. Ultimately, a resolver needs to know processing data from the zone. Ultimately, a resolver needs to know
whether or not to expect a usable signature covering the data. How whether or not to expect a usable signature covering the data. How
this determination is done is out of the scope of this document, this determination is done is out of the scope of this document,
except that, in some cases, the resolver will need to contact the except that, in some cases, the resolver will need to contact the
parent of the zone to see if the parent states that the child is parent of the zone to see if the parent states that the child is
secured. secured.
1.2 Islands of Security 1.2 Islands of Security
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tree, not necessarily "top down." tree, not necessarily "top down."
For example, at a particular instant, the root zone and the "test." For example, at a particular instant, the root zone and the "test."
TLD might be secured, but region1.test. might not be. (For reference, TLD might be secured, but region1.test. might not be. (For reference,
let's assume that region2.test. is secured.) However, let's assume that region2.test. is secured.) However,
subarea1.region1.test. may have gone through the process of becoming subarea1.region1.test. may have gone through the process of becoming
secured, along with its delegations. The dilemma here is that secured, along with its delegations. The dilemma here is that
subarea1 cannot get its zone keys properly signed as its parent zone, subarea1 cannot get its zone keys properly signed as its parent zone,
region1, is not secured. region1, is not secured.
The popular term for the secured zones at or below subarea1 is an The colloquial phrase describing the collection of contiguous secured
"island of security." The only way in which a DNSSEC resolver will zones at or below subarea1.region1.test. is an "island of security."
come to trust any data from this island is if the resolver is The only way in which a DNSSEC resolver will come to trust any data
pre-configured with the zone key(s) for subarea1. All other resolvers from this island is if the resolver is pre-configured with the zone
will not recognize this island as secured. key(s) for subarea1.region1.test., i.e., the root of the island of
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security. Other resolvers (not so configured) will recognize this
island as unsecured.
An island of security begins with one zone whose public key is
pre-configured in resolvers. Within this island are subzones which
are also secured. The "bottom" of the island is defined by
delegations to unsecured zones. One island may also be on top of
another - meaning that there is at least one unsecured zone between
the bottom of the upper island and the root of the lower secured
island.
Although both subarea1.region1.test. and region2.test. have both been Although both subarea1.region1.test. and region2.test. have both been
properly brought to a secure state by the administering staff, only properly brought to a secured state by the administering staff, only
the latter of the two is actually fully secured - in the sense that the latter of the two is actually "globally" secured - in the sense
all DNSSEC resolvers can and will verify its data. The former, that all DNSSEC resolvers can and will verify its data. The former,
subarea1, will be seen as secured by a subset of those resolvers, just subarea1, will be seen as secured by a subset of those resolvers, just
those appropriately configured. those appropriately configured. This document refers to such zones as
being "locally" secured.
In RFC 2535, there is a provision for "certification authorities," In RFC 2535, there is a provision for "certification authorities,"
entities that will sign public keys for zones such as subarea1. There entities that will sign public keys for zones such as subarea1. There
is another draft (currently in last call) that restricts this is another draft, [SIGAUTH], that restricts this activity. Regardless
activity. Regardless of the other draft, resolvers would still need of the other draft, resolvers would still need proper configuration to
proper configuration to be able to use the certification authority to be able to use the certification authority to verify the data for the
verify the data for the subarea1 island. subarea1 island.
1.3 Impact on RFC 2535 1.2.1 Determing the closest security root
This document updates several sections of RFC 2535. The definition of Given a domain, in order to determine whether it is secure or not, the
a secured zone is an update to section 3.4 of the RFC. Section 3.4 is first step is to determine the closest security root. The closest
security root is the top of an island of security whose name has the
most matching (in order from the root) right-most labels to the given
domain.
For example, given a name "sub.domain.testing.signed.exp.test.", and
given the secure roots "exp.test.", "testing.signed.exp.test." and
"not-the-same.xy.", the middle one is the closest. The first secure
root shares 2 labels, the middle 4, and the last 0.
The reason why the closest is desired is to eliminate false senses of
insecurity becuase of a NULL key. Continuing with the example, the
reason both "testing..." and "exp.test." are listed as secure root is
presumably because "signed.exp.test." is unsecured (has a NULL key).
If we started to descend from "exp.test." to our given domain
(sub...), we would encounter a NULL key and conclude that sub... was
unsigned. However, if we descend from "testing..." and find keys
"domain...." then we can conclude that "sub..." is secured.
Note that this example assumes one-label deep zones, and assumes that
we do not configure overlapping islands of security. To be clear, the
definition given should exclude "short.xy.test." from being a closest
security root for "short.xy." even though 2 labels match.
Overlapping islands of security introduce no conceptually interesting
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ideas and do not impact the protocol in anyway. However, protocol
implementers are advised to make sure their code is not thrown for a
loop by overlaps. Overlaps are sure to be configuration problems as
islands of security grow to encompass larger regions of the name
space.
1.3 Parent Statement of Child Security
In 1.1 of this document, there is the comment "the parent states that
the child is secured." This has caused quite a bit of confusion.
The need to have the parent "state" the status of a child is derived
from the following observation. If you are looking to see if an
answer is secured, that it comes from an "island of security" and is
properly signed, you must begin at the (appropriate) root of the
island of security.
To find the answer you are inspecting, you may have to descend through
zones within the island of security. Beginning with the trusted root
of the island, you descend into the next zone down. As you trust the
upper zone, you need to get data from it about the next zone down,
otherwise there is a vulnerable point in which a zone can be hijacked.
When or if you reach a point of traversing from a secured zone to an
unsecured zone, you have left the island of security and should
conclude that the answer is unsecured.
However, in RFC 2535, section 2.3.4, these words seem to conflict with
the need to have the parent "state" something about a child:
There MUST be a zone KEY RR, signed by its superzone, for every
subzone if the superzone is secure. This will normally appear in
the subzone and may also be included in the superzone. But, in
the case of an unsecured subzone which can not or will not be
modified to add any security RRs, a KEY declaring the subzone
to be unsecured MUST appear with the superzone signature in the
superzone, if the superzone is secure.
The confusion here is that in RFC 2535, a secured parent states that a
child is secured by SAYING NOTHING ("may also be" as opposed to "MUST
also be"). This is counter intuitive, the fact that an absence of
data means something is "secured." This notion, while acceptable in a
theoretic setting has met with some discomfort in an operation
setting. However, the use of "silence" to state something does indeed
work in this case, so there hasn't been sufficient need demonstrated
to change the definition.
1.4 Impact on RFC 2535
This document updates sections of RFC 2535. The definition of a
secured zone is an update to section 3.4 of the RFC. Section 3.4 is
updated to eliminate the definition of experimental keys and updated to eliminate the definition of experimental keys and
illustrate a way to still achieve the functionality they were designed illustrate a way to still achieve the functionality they were designed
to provide. Section 3.1.3 is updated by the specifying the value of to provide. Section 3.1.3 is updated by the specifying the value of
the protocol octet in a zone key. the protocol octet in a zone key.
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1.5 "MUST" and other key words
The key words "MUST", "REQUIRED", "SHOULD", "RECOMMENDED", and "MAY"
in this document are to be interpreted as described in [RFC 2119].
Currently, only "MUST" is used in this document.
2 Status of a Zone 2 Status of a Zone
In this section, rules governing a zone's DNSSEC status are presented. In this section, rules governing a zone's DNSSEC status are presented.
There are three levels of security defined: full, private, and There are three levels of security defined: global, local, and
unsecured. A zone is fully secure when it complies with the strictest unsecured. A zone is globally secure when it complies with the
set of DNSSEC processing rules. A zone is privately secured when it strictest set of DNSSEC processing rules. A zone is locally secured
is configured in such a way that only resolvers that are appropriately when it is configured in such a way that only resolvers that are
configured see the zone as secured. All other zones are unsecured. appropriately configured see the zone as secured. All other zones are
unsecured.
Note: there currently is no document completely defining DNSSEC Note: there currently is no document completely defining DNSSEC
verification rules. For the purposes of this document, the strictest verification rules. For the purposes of this document, the strictest
rules are assumed to state that the verification chain of zone keys rules are assumed to state that the verification chain of zone keys
parallels the delegation tree up to the root zone. This is not parallels the delegation tree up to the root zone. (See 2.b below.)
intended to disallow alternate verification paths, just to establish a This is not intended to disallow alternate verification paths, just to
baseline definition. establish a baseline definition.
To avoid repetition in the rules below, the following terms are To avoid repetition in the rules below, the following terms are
defined. defined.
2.a. Zone signing KEY RR - A KEY RR whose flag field has the value 01 2.a. Zone signing KEY RR - A KEY RR whose flag field has the value 01
for name type (indicating a zone key) and either value 00 or value 01 for name type (indicating a zone key) and either value 00 or value 01
for key type (indicating a key permitted to authenticate data). (See for key type (indicating a key permitted to authenticate data). (See
RFC 2535, section 3.1.2). The KEY RR also has a protocol octet value RFC 2535, section 3.1.2). The KEY RR also has a protocol octet value
of DNSSEC (3) or ALL (255). of DNSSEC (3) or ALL (255).
The definition updates RFC 2535's definition of a zone key. The The definition updates RFC 2535's definition of a zone key. The
requirement that the protocol field be either DNSSEC or ALL is a new requirement that the protocol field be either DNSSEC or ALL is a new
requirement. requirement, a change to section 3.1.3.)
2.b On-tree Validation - The authorization model in which only the 2.b On-tree Validation - The authorization model in which only the
parent zone can is recognized to supply a DNSSEC-meaningful signature parent zone is recognized to supply a DNSSEC-meaningful signature that
is used by a resolver to build a chain of trust from the child's keys
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that is used by a resolver to build a chain of trust from the child's
keys to a recognized root of security. The term "on-tree" refers to
following up the DNS domain hierarchy to reach a trusted key,
presumably the root key if no other key is available. The term presumably the root key if no other key is available. The term
"validation" refers to the digital signature by the parent to prove "validation" refers to the digital signature by the parent to prove
the integrity, authentication and authorization of the child' key to the integrity, authentication and authorization of the child' key to
sign the child's zone data. sign the child's zone data.
2.c Off-tree Validation - Any authorization model that permits domain 2.c Off-tree Validation - Any authorization model that permits domain
names other than the parent's to provide a signature over a child's names other than the parent's to provide a signature over a child's
zone keys that will enable a resolver to trust the keys. zone keys that will enable a resolver to trust the keys.
2.1 Fully Secured 2.1 Globally Secured
A fully secured zone, in a nutshell, is a zone that uses only A globally secured zone, in a nutshell, is a zone that uses only
mandatory to implement algorithms (RFC 2535, section 3.2) and relies mandatory to implement algorithms (RFC 2535, section 3.2) and relies
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on a key certification chain that parallels the delegation tree on a key certification chain that parallels the delegation tree
(on-tree validation). Fully secured zones are defined by the (on-tree validation). Globally secured zones are defined by the
following rules. following rules.
2.1.a. The zone's apex MUST have a KEY RR set. There MUST be at least 2.1.a. The zone's apex MUST have a KEY RR set. There MUST be at least
one zone signing KEY RR (2.a) of a mandatory to implement algorithm in one zone signing KEY RR (2.a) of a mandatory to implement algorithm in
the set. the set.
2.1.b. The zone's apex KEY RR set MUST be signed by a private key 2.1.b. The zone's apex KEY RR set MUST be signed by a private key
belonging to the parent zone. The private key's public companion MUST belonging to the parent zone. The private key's public companion MUST
be a zone signing KEY RR (2.a) of a mandatory to implement algorithm be a zone signing KEY RR (2.a) of a mandatory to implement algorithm
and owned by the parent's apex. and owned by the parent's apex.
If a zone cannot get a conforming signature from the parent zone, the If a zone cannot get a conforming signature from the parent zone, the
child zone cannot be considered fully secured. The only exception to child zone cannot be considered globally secured. The only exception
this is the root zone, for which there is no parent zone. to this is the root zone, for which there is no parent zone.
2.1.c. NXT records MUST be deployed throughout the zone. (Updates RFC 2.1.c. NXT records MUST be deployed throughout the zone. (Clarifies
2535, section 2.3.2.) Note: there is some operational discomfort with RFC 2535, section 2.3.2.) Note: there is some operational discomfort
the current NXT record. This requirement is open to modification when with the current NXT record. This requirement is open to modification
two things happen. First, an alternate mechanism to the NXT is when two things happen. First, an alternate mechanism to the NXT is
defined and second, a means by which a zone can indicate that it is defined and second, a means by which a zone can indicate that it is
using an alternate method. using an alternate method.
2.1.d. Each RR set that qualifies for zone membership MUST be signed 2.1.d. Each RR set that qualifies for zone membership MUST be signed
by a key that is in the apex's KEY RR set and is a zone signing KEY RR by a key that is in the apex's KEY RR set and is a zone signing KEY RR
(2.a) of a mandatory to implement algorithm. (Updates 2535, section (2.a) of a mandatory to implement algorithm. (Updates 2535, section
2.3.1.) 2.3.1.)
Mentioned earlier, the root zone is a special case. Defining what Mentioned earlier, the root zone is a special case. The root zone
constitutes a secure root zone is difficult, as the discussion on will be considered to be globally secured provided that if conforms to
securing the root zone has not come to a consensus in an open forum. the rules for locally secured, with the exception that rule 2.1.a. be
However, the security of the root zone will be determined by the also met (mandatory to implement requirement).
pre-configuration of a trusted key in resolvers. Who generates and
distributes the trusted key is an open issue.
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2.2 Privately Secured 2.2 Locally Secured
Note that the term "privately" is open to debate. The term stems from The term "locally" stems from the likely hood that the only resolvers
the likely hood that the only resolvers to be configured for a to be configured for a particular zone will be resolvers "local" to an
particular zone will be resolvers "private" to an organization. organization.
Perhaps the more clumsy "colloquially secure" is more accurate.
A privately secured zone is a zone that complies with rules like those A locally secured zone is a zone that complies with rules like those
for a fully secured zone with the following exceptions. The signing for a globally secured zone with the following exceptions. The
keys may be of an algorithm that is not mandatory to implement and/or signing keys may be of an algorithm that is not mandatory to implement
the verification of the zone keys in use may rely on a verification and/or the verification of the zone keys in use may rely on a
chain that is not parallel to the delegation tree (off-tree verification chain that is not parallel to the delegation tree
validation). (off-tree validation).
2.2.a. The zone's apex MUST have a KEY RR set. There MUST be at least 2.2.a. The zone's apex MUST have a KEY RR set. There MUST be at least
one zone signing KEY RR (2.a) in the set. one zone signing KEY RR (2.a) in the set.
2.2.b. The zone's apex KEY RR set MUST be signed by a private key and 2.2.b. The zone's apex KEY RR set MUST be signed by a private key and
one of the following two subclauses MUST hold true. one of the following two subclauses MUST hold true.
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2.2.b.1 The private key's public companion MUST be pre-configured in 2.2.b.1 The private key's public companion MUST be pre-configured in
all the resolvers of interest. all the resolvers of interest.
2.2.b.2 The private key's public component MUST be a zone signing KEY 2.2.b.2 The private key's public component MUST be a zone signing KEY
RR (2.a) authorized to provide validation of the zone's apex KEY RR RR (2.a) authorized to provide validation of the zone's apex KEY RR
set, as recognized by resolvers of interest. set, as recognized by resolvers of interest.
The previous sentence is trying to convey the notion of using a The previous sentence is trying to convey the notion of using a
trusted third party to provide validation of keys. If the domain name trusted third party to provide validation of keys. If the domain name
owning the validating key is not the parent zone, the domain name must owning the validating key is not the parent zone, the domain name must
represent someone the resolver trusts to provide validation. represent someone the resolver trusts to provide validation.
2.2.c. NXT records MUST be deployed throughout the zone. (Updates RFC 2.2.c. NXT records MUST be deployed throughout the zone. Note: see
2535, section 2.3.2.) Note: see the discussion following 2.1.c. the discussion following 2.1.c.
2.2.d. Each RR set that qualifies for zone membership MUST be signed 2.2.d. Each RR set that qualifies for zone membership MUST be signed
by a key that is in the apex's KEY RR set and is a zone signing KEY RR by a key that is in the apex's KEY RR set and is a zone signing KEY RR
(2.a). (Updates 2535, section 2.3.1.) (2.a). (Updates 2535, section 2.3.1.)
2.3 Unsecured 2.3 Unsecured
All other zones qualify as unsecured. This includes zones that are All other zones qualify as unsecured. This includes zones that are
designed to be experimentally secure, as defined in a later section on designed to be experimentally secure, as defined in a later section on
that topic. that topic.
2.4 Wrap up 2.4 Wrap up
The designation of fully secured, privately secured, and unsecured are The designation of globally secured, locally secured, and unsecured
merely labels to apply to zones, based on their contents. Resolvers, are merely labels to apply to zones, based on their contents.
when determining whether a signature is expected or not, will only see Resolvers, when determining whether a signature is expected or not,
a zone as secured or unsecured. will only see a zone as secured or unsecured.
Resolvers that follow the most restrictive DNSSEC verification rules Resolvers that follow the most restrictive DNSSEC verification rules
will only see fully secured zones as secured, and all others as will only see globally secured zones as secured, and all others as
unsecured, including zones which are locally secured. Resolvers that
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^LDNS Security Extension Clarification on Zone Status January 12, 2001 addition to the mandatory to implement algorithms, will see some
locally secured zones as secured.
unsecured, including zones which are privately secured. Resolvers
that are not as restrictive, such as those that implement algorithms
in addition to the mandatory to implement algorithms, will see some
privately secured zones as secured.
The intent of the labels "fully" and "privately" is to identify the The intent of the labels "global" and "local" is to identify the
specific attributes of a zone. The words are chosen to assist in the specific attributes of a zone. The words are chosen to assist in the
writing of a document recommending the actions a zone administrator writing of a document recommending the actions a zone administrator
take in making use of the DNS security extensions. The words are take in making use of the DNS security extensions. The words are
explicitly not intended to convey a state of compliance with DNS explicitly not intended to convey a state of compliance with DNS
security standards. security standards.
3 Deleted 3 Experimental Status
4 Deleted
5 Experimental Status
The purpose of an experimentally secured zone is to facilitate the The purpose of an experimentally secured zone is to facilitate the
migration from an unsecured zone to a secured zone. This distinction migration from an unsecured zone to a secured zone. This distinction
is dropped. is dropped.
The objective of facilitating the migration can be achieved without a The objective of facilitating the migration can be achieved without a
special designation of an experimentally secure status. special designation of an experimentally secure status. Experimentally
Experimentally secured is a special case of privately secured. A zone
administrator can achieve this by publishing a zone with signatures
and configuring a set of test resolvers with the corresponding public
keys. Even if the public key is published in a KEY RR, as long as
there is no parent signature, the resolvers will need some
pre-configuration to know to process the signatures. This allows a
zone to be secured with in the sphere of the experiment, yet still be
registered as unsecured in the general Internet.
6 IANA/ICANN Considerations Expires March 19, 2001 [Page 7]
secured is a special case of globally secured. A zone administrator
can achieve this by publishing a zone with signatures and configuring
a set of test resolvers with the corresponding public keys. Even if
the public key is published in a KEY RR, as long as there is no parent
signature, the resolvers will need some pre-configuration to know to
process the signatures. This allows a zone to be secured with in the
sphere of the experiment, yet still be registered as unsecured in the
general Internet.
4 IANA/ICANN Considerations
This document does not request any action from an assigned number This document does not request any action from an assigned number
authority nor recommends any actions. authority nor recommends any actions.
7 Security Considerations 5 Security Considerations
Without a means to enforce compliance with specified protocols or Without a means to enforce compliance with specified protocols or
recommended actions, declaring a DNS zone to be "completely" secured recommended actions, declaring a DNS zone to be "completely" secured
is impossible. Even if, assuming an omnipotent view of DNS, one can is impossible. Even if, assuming an omnipotent view of DNS, one can
declare a zone to be properly configured for security, and all of the declare a zone to be properly configured for security, and all of the
zones up to the root too, a misbehaving resolver could be duped into zones up to the root too, a misbehaving resolver could be duped into
believing bad data. If a zone and resolver comply, a non-compliant or believing bad data. If a zone and resolver comply, a non-compliant or
subverted parent could interrupt operations. The best that can be subverted parent could interrupt operations. The best that can be
hoped for is that all parties are prepared to be judged secure and hoped for is that all parties are prepared to be judged secure and
that security incidents can be traced to the cause in short order. that security incidents can be traced to the cause in short order.
8 Acknowledgements 6 Acknowledgements
The need to refine the definition of a secured zone has become The need to refine the definition of a secured zone has become
apparent through the efforts of the participants at two DNSSEC apparent through the efforts of the participants at two DNSSEC
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workshops, sponsored by the NIC-SE (.se registrar), CAIRN (a workshops, sponsored by the NIC-SE (.se registrar), CAIRN (a
DARPA-funded research network), and other workshops. Further DARPA-funded research network), and other workshops. Further
discussions leading to the document include Olafur Gudmundsson, Russ discussions leading to the document include Olafur Gudmundsson, Russ
Mundy, Robert Watson, and Brian Wellington. Roy Arends, Ted Lindgreen Mundy, Robert Watson, and Brian Wellington. Roy Arends, Ted Lindgreen
and others have contributed significant input via the namedroppers and others have contributed significant input via the namedroppers
mailing list. mailing list.
9 References 7 References
[RFC1034] P. Mockapetris, "Domain Names - Concepts and Facilities," [RFC1034] P. Mockapetris, "Domain Names - Concepts and Facilities,"
RFC 1034, November 1987. RFC 1034, November 1987.
[RFC1035] P. Mockapetris, "Domain Names - Implementation and [RFC1035] P. Mockapetris, "Domain Names - Implementation and
Specification," RFC 1034, November 1987. Specification," RFC 1034, November 1987.
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate [RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels," RFC 2119, March 1997 Requirement Levels," RFC 2119, March 1997
[RFC2136] P. Vixie (Ed.), S. Thomson, Y. Rekhter, J. Bound "Dynamic [RFC2136] P. Vixie (Ed.), S. Thomson, Y. Rekhter, J. Bound "Dynamic
Updates in the Domain Name System," RFC 2136, April 1997. Updates in the Domain Name System," RFC 2136, April 1997.
[RFC2535] D. Eastlake, "Domain Name System Security Extensions," RFC [RFC2535] D. Eastlake, "Domain Name System Security Extensions," RFC
2535, March 1999. 2535, March 1999.
Expires March 19, 2001 [Page 8]
[draft-ietf-dnsext-simple-secure-update-xy.txt] B. Wellington, "Simple [draft-ietf-dnsext-simple-secure-update-xy.txt] B. Wellington, "Simple
Secure Domain Name System (DNS) Dynamic Update," version 00, February Secure Domain Name System (DNS) Dynamic Update," version 00, February
2000. 2000.
[SIGAUTH] B. Wellington, draft-ietf-dnsext-signing-auth-01.txt
10 Author Information 10 Author Information
Edward Lewis Edward Lewis NAI Labs 3060 Washington Road Glenwood, MD 21738 +1 443
NAI Labs 259 2352 <lewis@tislabs.com>
3060 Washington Road
Glenwood, MD 21738
+1 443 259 2352
<lewis@tislabs.com>
11 Full Copyright Statement 11 Full Copyright Statement
Copyright (C) The Internet Society (1999, 2000). All Rights Reserved. Copyright (C) The Internet Society (1999, 2000). All Rights Reserved.
This document and translations of it may be copied and furnished to This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published and or assist in its implementation may be prepared, copied, published and
distributed, in whole or in part, without restriction of any kind, distributed, in whole or in part, without restriction of any kind,
provided that the above copyright notice and this paragraph are provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of developing Internet organizations, except as needed for the purpose of developing
Internet standards in which case the procedures for copyrights defined Internet standards in which case the procedures for copyrights defined
in the Internet Standards process must be followed, or as required to in the Internet Standards process must be followed, or as required to
translate it into languages other than English. translate it into languages other than English.
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The limited permissions granted above are perpetual and will not be The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns. revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN
WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE." MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE."
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