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@ -5,21 +5,21 @@
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Domain Name System Operations A. Dulaunoy
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Domain Name System Operations A. Dulaunoy
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Internet-Draft CIRCL
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Internet-Draft CIRCL
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||||||
Intended status: Informational A. Kaplan
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Intended status: Informational A. Kaplan
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Expires: 29 October 2024
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Expires: 28 February 2025
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P. Vixie
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P. Vixie
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H. Stern
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H. Stern
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Farsight Security, Inc.
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Farsight Security, Inc.
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W. Kumari
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W. Kumari
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Google
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Google
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||||||
27 April 2024
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27 August 2024
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Passive DNS - Common Output Format
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Passive DNS - Common Output Format
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draft-dulaunoy-dnsop-passive-dns-cof-11
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draft-dulaunoy-dnsop-passive-dns-cof-12
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||||||
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Abstract
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Abstract
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||||||
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This document describes a common output format of Passive DNS Servers
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This document describes a common output format of Passive DNS servers
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that clients can query. The output format description also includes
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that clients can query. The output format description also includes
|
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a common semantic for each Passive DNS system. By having multiple
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a common semantic for each Passive DNS system. By having multiple
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Passive DNS Systems adhere to the same output format for queries,
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Passive DNS Systems adhere to the same output format for queries,
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@ -41,7 +41,7 @@ Status of This Memo
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||||||
time. It is inappropriate to use Internet-Drafts as reference
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time. It is inappropriate to use Internet-Drafts as reference
|
||||||
material or to cite them other than as "work in progress."
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material or to cite them other than as "work in progress."
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||||||
|
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||||||
This Internet-Draft will expire on 29 October 2024.
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This Internet-Draft will expire on 28 February 2025.
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Copyright Notice
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Copyright Notice
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||||||
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@ -53,9 +53,9 @@ Copyright Notice
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Dulaunoy, et al. Expires 29 October 2024 [Page 1]
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Dulaunoy, et al. Expires 28 February 2025 [Page 1]
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||||||
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Internet-Draft Passive DNS - Common Output Format April 2024
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Internet-Draft Passive DNS - Common Output Format August 2024
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||||||
|
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||||||
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This document is subject to BCP 78 and the IETF Trust's Legal
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This document is subject to BCP 78 and the IETF Trust's Legal
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||||||
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@ -70,80 +70,114 @@ Internet-Draft Passive DNS - Common Output Format April 2024
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||||||
Table of Contents
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Table of Contents
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||||||
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||||||
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
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||||||
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
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1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
|
||||||
2. Limitation . . . . . . . . . . . . . . . . . . . . . . . . . 3
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2. Limitations . . . . . . . . . . . . . . . . . . . . . . . . . 4
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||||||
3. Common Output Format . . . . . . . . . . . . . . . . . . . . 4
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3. Common Output Format . . . . . . . . . . . . . . . . . . . . 4
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3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 4
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3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 4
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3.2. ABNF grammar . . . . . . . . . . . . . . . . . . . . . . 4
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3.2. ABNF grammar . . . . . . . . . . . . . . . . . . . . . . 4
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||||||
3.3. Mandatory Fields . . . . . . . . . . . . . . . . . . . . 5
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3.3. Mandatory Fields . . . . . . . . . . . . . . . . . . . . 5
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||||||
3.3.1. rrname . . . . . . . . . . . . . . . . . . . . . . . 5
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3.3.1. rrname . . . . . . . . . . . . . . . . . . . . . . . 6
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||||||
3.3.2. rrtype . . . . . . . . . . . . . . . . . . . . . . . 5
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3.3.2. rrtype . . . . . . . . . . . . . . . . . . . . . . . 6
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||||||
3.3.3. rdata . . . . . . . . . . . . . . . . . . . . . . . . 6
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3.3.3. rdata . . . . . . . . . . . . . . . . . . . . . . . . 6
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||||||
3.3.4. time_first . . . . . . . . . . . . . . . . . . . . . 6
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3.3.4. time_first . . . . . . . . . . . . . . . . . . . . . 6
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3.3.5. time_last . . . . . . . . . . . . . . . . . . . . . . 6
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3.3.5. time_last . . . . . . . . . . . . . . . . . . . . . . 7
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||||||
3.4. Optional Fields . . . . . . . . . . . . . . . . . . . . . 6
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3.4. Optional Fields . . . . . . . . . . . . . . . . . . . . . 7
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||||||
3.4.1. count . . . . . . . . . . . . . . . . . . . . . . . . 6
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3.4.1. count . . . . . . . . . . . . . . . . . . . . . . . . 7
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3.4.2. bailiwick . . . . . . . . . . . . . . . . . . . . . . 7
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3.4.2. bailiwick . . . . . . . . . . . . . . . . . . . . . . 7
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||||||
3.5. Additional Fields . . . . . . . . . . . . . . . . . . . . 7
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3.5. Additional Fields . . . . . . . . . . . . . . . . . . . . 7
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||||||
3.5.1. sensor_id . . . . . . . . . . . . . . . . . . . . . . 7
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3.5.1. sensor_id . . . . . . . . . . . . . . . . . . . . . . 7
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||||||
3.5.2. zone_time_first . . . . . . . . . . . . . . . . . . . 7
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3.5.2. zone_time_first . . . . . . . . . . . . . . . . . . . 7
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3.5.3. zone_time_last . . . . . . . . . . . . . . . . . . . 7
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3.5.3. zone_time_last . . . . . . . . . . . . . . . . . . . 8
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3.5.4. origin . . . . . . . . . . . . . . . . . . . . . . . 7
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3.5.4. origin . . . . . . . . . . . . . . . . . . . . . . . 8
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3.5.5. time_first_ms . . . . . . . . . . . . . . . . . . . . 7
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3.5.5. time_first_ms . . . . . . . . . . . . . . . . . . . . 8
|
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3.5.6. time_last_ms . . . . . . . . . . . . . . . . . . . . 8
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3.5.6. time_last_ms . . . . . . . . . . . . . . . . . . . . 8
|
||||||
3.6. Additional Fields Registry . . . . . . . . . . . . . . . 8
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3.6. Additional Fields Registry . . . . . . . . . . . . . . . 8
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3.7. Additional notes . . . . . . . . . . . . . . . . . . . . 8
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3.7. Additional notes . . . . . . . . . . . . . . . . . . . . 8
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||||||
3.8. Suggested MIME Types . . . . . . . . . . . . . . . . . . 8
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3.8. Suggested MIME Types . . . . . . . . . . . . . . . . . . 8
|
||||||
4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8
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4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
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||||||
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
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5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
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6. Privacy Considerations . . . . . . . . . . . . . . . . . . . 8
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6. Privacy Considerations . . . . . . . . . . . . . . . . . . . 9
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7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
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7. Security Considerations . . . . . . . . . . . . . . . . . . . 10
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8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
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8. Normative References . . . . . . . . . . . . . . . . . . . . 10
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||||||
8.1. Normative References . . . . . . . . . . . . . . . . . . 9
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9. Informative References . . . . . . . . . . . . . . . . . . . 11
|
||||||
8.2. References . . . . . . . . . . . . . . . . . . . . . . . 10
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Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 12
|
||||||
8.3. Informative References . . . . . . . . . . . . . . . . . 11
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Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13
|
||||||
Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 11
|
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||||||
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
|
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|
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||||||
|
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||||||
|
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||||||
|
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||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 2]
|
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||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 2]
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
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Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
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||||||
|
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1. Introduction
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1. Introduction
|
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Passive DNS is a technique described by Florian Weimer in 2005 in
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Passive DNS is a technique described by Florian Weimer in 2005 in
|
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Passive DNS replication, F Weimer - 17th Annual FIRST Conference on
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Passive DNS replication, F Weimer - 17th Annual FIRST Conference on
|
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Computer Security [WEIMERPDNS]. Since then, multiple Passive DNS
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Computer Security [WEIMERPDNS]. It is a mechanism for logging DNS
|
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implementations were created and have evolved over time. Users of
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answers in a manner intended to minimize the privacy implications to
|
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these Passive DNS servers may query a server (often via WHOIS
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users, and is widely by security researchers to investigate malware
|
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[RFC3912] or HTTP REST [REST]), parse the results, and process them
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(for example to discover command and control servers), and other
|
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in other applications.
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security threats. By capturing only the "cache fill" DNS responses
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(responses from authoritative servers in response to queries
|
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performed by a recursive resolver when iteratively resolving a name),
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Passive DNS does not have access to the client (users) source IP,
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source port, destination IP, or destination port.
|
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There are multiple implementations of Passive DNS software. Users of
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As these answers are served in response to queries originally
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Passive DNS query each implementation and aggregate the results for
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initiated by user devices, the Passive DNS data can be used to detect
|
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their search. This document describes the output format of four
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if devices using the resolver are connecting to known malicious
|
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Passive DNS Systems ([DNSDB], [DNSDBQ] , [PDNSCERTAT], [PDNSCIRCL]
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domains, without identifying the individual users / devices. In
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and [PDNSCOF]) that are in use today and that already share a nearly
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addition, as answers are responses to queries made by the recursive
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identical output format. As the format and the meaning of output
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server itself, Passive DNS records the answers which are ultimately
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fields from each Passive DNS need to be consistent, this document
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served to users. This is important as authoritative servers may
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proposes a solution to commonly name each field along with its
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serve different answers to different query addresses, for example to
|
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corresponding interpretation. The format follows a simple key-value
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increase performance (e.g Client Subnet in DNS Queries [RFC7871]) or
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structure in JSON [RFC4627] format. The benefit of having a
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to hide malicious behavior when queried from addresses known to be
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consistent Passive DNS output format is that multiple client
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associated with security researchers.
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implementations can query different servers without having to have a
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separate parser for each individual server. passivedns-client
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Passive DNS is usually implemented either by capturing DNS response
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[PDNSCLIENT] currently implements multiple parsers due to a lack of
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packets themselves (i.e packets with a destination address of the
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standardization. The document does not describe the protocol (e.g.
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recursive resolver, a source port of 53, and the QR bit set to 1) or
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WHOIS [RFC3912], HTTP REST [REST]) nor the query format used to query
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by having the DNS software itself log these responses. The latter
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the Passive DNS. Neither does this document describe "pre-recursor"
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method is likely to become more common as recursive to authoritative
|
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Passive DNS Systems. Each of these are separate topics and deserve
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DNS communication becomes encrypted.
|
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their own RFC documents. This document describes the current best
|
|
||||||
practices implemented in various Passive DNS server implementations.
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Multiple Passive DNS implementations and services exist. Users of
|
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these Passive DNS services may query a server (often via WHOIS
|
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[RFC3912] or HTTP REST [REST]), parse the results, and process them
|
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in other applications. Users of Passive DNS query each
|
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implementation and aggregate the results for their search. This
|
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document describes the output format of four Passive DNS Systems
|
||||||
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([DNSDB], [DNSDBQ] , [PDNSCERTAT], [PDNSCIRCL] and [PDNSCOF]) that
|
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are in use today and that already share a nearly identical output
|
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format. As the format and the meaning of output fields from each
|
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Passive DNS need to be consistent, this document proposes a solution
|
||||||
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to commonly name each field along with its corresponding
|
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interpretation. The format follows a simple key-value structure in
|
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JSON [RFC4627] format. The benefit of having a consistent Passive
|
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DNS output format is that multiple client implementations can query
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different servers without having to have a separate parser for each
|
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Dulaunoy, et al. Expires 28 February 2025 [Page 3]
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Internet-Draft Passive DNS - Common Output Format August 2024
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individual server. passivedns-client [PDNSCLIENT] currently
|
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implements multiple parsers due to a lack of standardization. The
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document does not describe the protocol (e.g. WHOIS [RFC3912], HTTP
|
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REST [REST]) nor the query format used to query the Passive DNS.
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Neither does this document describe "pre-recursor" Passive DNS
|
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Systems. Each of these are separate topics and deserve their own RFC
|
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documents. This document describes the current best practices
|
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implemented in various Passive DNS server implementations.
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1.1. Requirements Language
|
1.1. Requirements Language
|
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@ -151,26 +185,18 @@ Internet-Draft Passive DNS - Common Output Format April 2024
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"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
|
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
|
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document are to be interpreted as described in RFC 2119 [RFC2119].
|
document are to be interpreted as described in RFC 2119 [RFC2119].
|
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2. Limitation
|
2. Limitations
|
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As Passive DNS servers can include protection mechanisms for their
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As Passive DNS servers can include protection mechanisms for their
|
||||||
operation, results might be different due to those protection
|
operation, results might be different due to those protection
|
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measures. These mechanisms filter out DNS answers if they fail some
|
measures. These mechanisms filter out DNS answers if they fail some
|
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criteria. The bailiwick algorithm [BAILIWICK] protects the Passive
|
criteria. The bailiwick algorithm [BAILIWICK] protects the Passive
|
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DNS Database from cache poisoning attacks [CACHEPOISONING]. Another
|
DNS Database from cache poisoning attacks. Another limitation that
|
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limitation that clients querying the database need to be aware of is
|
clients querying the database need to be aware of is that each query
|
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that each query simply gets a snapshot-in-time answer at the time of
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simply gets a snapshot-in-time answer at the time of querying.
|
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querying. Clients MUST NOT rely on existing answers from different
|
Clients MUST NOT rely on existing answers from different Passive DNS
|
||||||
Passive DNS database. Nor should they assume that answers will be
|
database. Nor should they assume that answers will be identical
|
||||||
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across multiple Passive DNS servers.
|
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|
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||||||
|
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||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 3]
|
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||||||
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||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
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|
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identical across multiple Passive DNS Servers.
|
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3. Common Output Format
|
3. Common Output Format
|
||||||
|
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@ -192,6 +218,14 @@ Internet-Draft Passive DNS - Common Output Format April 2024
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||||||
|
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||||||
Formal grammar as defined in ABNF [RFC2234]
|
Formal grammar as defined in ABNF [RFC2234]
|
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|
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|
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Dulaunoy, et al. Expires 28 February 2025 [Page 4]
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||||||
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Internet-Draft Passive DNS - Common Output Format August 2024
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||||||
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answer = entries
|
answer = entries
|
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entries = * ( entry newline )
|
entries = * ( entry newline )
|
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entry = ws "{" ws keyvallist ws "}" ws
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entry = ws "{" ws keyvallist ws "}" ws
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|
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@ -215,16 +249,7 @@ Internet-Draft Passive DNS - Common Output Format April 2024
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)
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)
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Figure 1
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||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 4]
|
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Internet-Draft Passive DNS - Common Output Format April 2024
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Note that value is defined in JSON [RFC4627] and has the same
|
Note that value is defined in JSON [RFC4627] and has the same
|
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specification as there. The same goes for the definition of string.
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specification as there. The same goes for the definition of string.
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|
|
@ -246,6 +271,17 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
Senders SHOULD send an array for rdata, but receivers MUST be able to
|
Senders SHOULD send an array for rdata, but receivers MUST be able to
|
||||||
accept a single-string result for rdata.
|
accept a single-string result for rdata.
|
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|
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||||||
|
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||||||
|
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||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 5]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
3.3.1. rrname
|
3.3.1. rrname
|
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|
|
||||||
This field returns the name of the queried resource. Represented as
|
This field returns the name of the queried resource. Represented as
|
||||||
|
|
@ -268,20 +304,6 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
a decimal value (as mentioned above) answer represented as a JSON
|
a decimal value (as mentioned above) answer represented as a JSON
|
||||||
[RFC4627] number.
|
[RFC4627] number.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 5]
|
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
|
||||||
|
|
||||||
|
|
||||||
3.3.3. rdata
|
3.3.3. rdata
|
||||||
|
|
||||||
This field returns the resource records of the queried resource.
|
This field returns the resource records of the queried resource.
|
||||||
|
|
@ -306,6 +328,16 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
timestamp). The time zone MUST be UTC. This field is represented as
|
timestamp). The time zone MUST be UTC. This field is represented as
|
||||||
a JSON [RFC4627] number.
|
a JSON [RFC4627] number.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 6]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
3.3.5. time_last
|
3.3.5. time_last
|
||||||
|
|
||||||
This field returns the last time that the unique tuple (rrname,
|
This field returns the last time that the unique tuple (rrname,
|
||||||
|
|
@ -321,23 +353,12 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
3.4.1. count
|
3.4.1. count
|
||||||
|
|
||||||
Specifies how many authoritative DNS answers were received at the
|
Specifies how many authoritative DNS answers were received at the
|
||||||
Passive DNS Server's collectors with exactly the given set of values
|
Passive DNS server's collectors with exactly the given set of values
|
||||||
as answers (i.e. same data in the answer set - compare with the
|
as answers (i.e. same data in the answer set - compare with the
|
||||||
uniqueness property in "Mandatory Fields"). The number of requests
|
uniqueness property in "Mandatory Fields"). The number of requests
|
||||||
is expressed as a decimal value. This field is represented as a JSON
|
is expressed as a decimal value. This field is represented as a JSON
|
||||||
[RFC4627] number.
|
[RFC4627] number.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 6]
|
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
|
||||||
|
|
||||||
|
|
||||||
3.4.2. bailiwick
|
3.4.2. bailiwick
|
||||||
|
|
||||||
The bailiwick is the best estimate of the apex of the zone where this
|
The bailiwick is the best estimate of the apex of the zone where this
|
||||||
|
|
@ -365,6 +386,14 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
timestamp). The time zone MUST be UTC. This field is represented as
|
timestamp). The time zone MUST be UTC. This field is represented as
|
||||||
a JSON [RFC4627] number.
|
a JSON [RFC4627] number.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 7]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
3.5.3. zone_time_last
|
3.5.3. zone_time_last
|
||||||
|
|
||||||
This field returns the last time that the unique tuple (rrname,
|
This field returns the last time that the unique tuple (rrname,
|
||||||
|
|
@ -385,15 +414,6 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
that the resolution is in milliseconds since 1st of January 1970
|
that the resolution is in milliseconds since 1st of January 1970
|
||||||
(UTC).
|
(UTC).
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 7]
|
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
|
||||||
|
|
||||||
|
|
||||||
3.5.6. time_last_ms
|
3.5.6. time_last_ms
|
||||||
|
|
||||||
Same meaning as the field "time_last", with the only difference, that
|
Same meaning as the field "time_last", with the only difference, that
|
||||||
|
|
@ -408,7 +428,7 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
|
|
||||||
3.7. Additional notes
|
3.7. Additional notes
|
||||||
|
|
||||||
An implementer of a passive DNS Server MAY chose to either return
|
An implementer of a passive DNS server MAY chose to either return
|
||||||
time_first and time_last OR return zone_time_first and
|
time_first and time_last OR return zone_time_first and
|
||||||
zone_time_last. In pseudocode: (time_first AND time_last) OR
|
zone_time_last. In pseudocode: (time_first AND time_last) OR
|
||||||
(zone_time_first AND zone_time_last). In this case,
|
(zone_time_first AND zone_time_last). In this case,
|
||||||
|
|
@ -419,10 +439,17 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
|
|
||||||
3.8. Suggested MIME Types
|
3.8. Suggested MIME Types
|
||||||
|
|
||||||
An implementer of a passive DNS Server SHOULD serve a document in
|
An implementer of a passive DNS server SHOULD serve a document in
|
||||||
this Common Output Format with a MIME header of "application/
|
this Common Output Format with a MIME header of "application/
|
||||||
x-ndjson".
|
x-ndjson".
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 8]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
4. Acknowledgements
|
4. Acknowledgements
|
||||||
|
|
||||||
Thanks to the Passive DNS developers who contributed to the document.
|
Thanks to the Passive DNS developers who contributed to the document.
|
||||||
|
|
@ -433,134 +460,131 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
|
|
||||||
6. Privacy Considerations
|
6. Privacy Considerations
|
||||||
|
|
||||||
Passive DNS Servers capture DNS answers from multiple collection
|
Passive DNS servers capture DNS answers from multiple collection
|
||||||
points ("sensors") which are located on the Internet-facing side of
|
points ("sensors") which are located on the Internet-facing side of
|
||||||
DNS recursors ("post-recursor passive DNS"). In this process, they
|
DNS recursors ("post-recursor passive DNS"). In this process, they
|
||||||
intentionally omit the source IP, source port, destination IP and
|
intentionally omit the source IP, source port, destination IP and
|
||||||
destination port from the captured packets. Since the data is
|
destination port from the captured packets. Since the data is
|
||||||
captured "post-recursor", the timing information (who queries what)
|
captured "post-recursor", the timing information (who queries what)
|
||||||
is lost, since the recursor will cache the results. Furthermore,
|
is lost, since the recursor will cache the results. Furthermore,
|
||||||
since multiple sensors feed into a passive DNS server, the resulting
|
since multiple sensors feed into a passive DNS system, the resulting
|
||||||
data gets mixed together, reducing the likelihood that Passive DNS
|
data gets mixed together, reducing the likelihood that Passive DNS
|
||||||
|
systems are able to find out much about the actual person querying
|
||||||
|
the DNS records. In this sense, passive DNS systems are similar to
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 8]
|
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
|
||||||
|
|
||||||
|
|
||||||
Servers are able to find out much about the actual person querying
|
|
||||||
the DNS records. In this sense, passive DNS Servers are similar to
|
|
||||||
keeping an archive of all previous phone books - if public DNS
|
keeping an archive of all previous phone books - if public DNS
|
||||||
records can be compared to phone numbers - as they often are.
|
records can be compared to phone numbers - as they often are.
|
||||||
Nevertheless, the authors strongly encourage Passive DNS implementors
|
Nevertheless, the authors strongly encourage Passive DNS implementors
|
||||||
to take special care of privacy issues. bortzmeyer-dnsop-dns-privacy
|
to take special care of privacy issues. Finally, the overall
|
||||||
is an excellent starting point for this. Finally, the overall
|
|
||||||
recommendations in RFC6973 [RFC6973] should be taken into
|
recommendations in RFC6973 [RFC6973] should be taken into
|
||||||
consideration when designing any application which uses Passive DNS
|
consideration when designing any application which uses Passive DNS
|
||||||
data.
|
data.
|
||||||
|
|
||||||
|
Passive DNS attempts to collect information necessary for security
|
||||||
|
(such as malware protection) in as privacy protecting a manner as
|
||||||
|
possible, and is intended to be used instead of more invasive
|
||||||
|
methods. It does this by only collecting DNS cache-fill answers, and
|
||||||
|
not any information associated with who caused the name to be
|
||||||
|
resolved, nor why the name was resolved. Nevertheless, it is
|
||||||
|
possible that this may still lead to privacy concerns - for example,
|
||||||
|
if Passive DNS records show that a recursive resolver resolved the
|
||||||
|
name the-mary-and-john-smith-family.example.com, it may be possible
|
||||||
|
to infer that the Smith family is using that resolver. Operators of
|
||||||
|
Passive DNS servers should be aware of this and take appropriate
|
||||||
|
steps to limit access to the data.
|
||||||
|
|
||||||
|
Passive DNS operators are encouraged to read and understand RFC7258
|
||||||
|
[RFC7258]
|
||||||
|
|
||||||
In the scope of the General Data Protection Regulation (GDPR -
|
In the scope of the General Data Protection Regulation (GDPR -
|
||||||
Directive 95/46/EC), operators of Passive DNS Server needs to ensure
|
Directive 95/46/EC), operators of Passive DNS server needs to ensure
|
||||||
the legal ground and lawfulness of its operation.
|
the legal ground and lawfulness of its operation.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 9]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
7. Security Considerations
|
7. Security Considerations
|
||||||
|
|
||||||
In some cases, Passive DNS output might contain confidential
|
In some cases, Passive DNS output might contain confidential
|
||||||
information and its access might be restricted. When a user is
|
information and its access should be restricted. When a user is
|
||||||
querying multiple Passive DNS and aggregating the data, the
|
querying multiple Passive DNS and aggregating the data, the
|
||||||
sensitivity of the data must be considered.
|
sensitivity of the data must be considered.
|
||||||
|
|
||||||
8. References
|
8. Normative References
|
||||||
|
|
||||||
8.1. Normative References
|
|
||||||
|
|
||||||
[RFC1034] Mockapetris, P., "Domain names - concepts and facilities",
|
|
||||||
STD 13, RFC 1034, DOI 10.17487/RFC1034, November 1987,
|
|
||||||
<https://www.rfc-editor.org/info/rfc1034>.
|
|
||||||
|
|
||||||
[RFC1035] Mockapetris, P., "Domain names - implementation and
|
|
||||||
specification", STD 13, RFC 1035, DOI 10.17487/RFC1035,
|
|
||||||
November 1987, <https://www.rfc-editor.org/info/rfc1035>.
|
|
||||||
|
|
||||||
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
|
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
|
||||||
Requirement Levels", BCP 14, RFC 2119,
|
Requirement Levels", BCP 14, RFC 2119,
|
||||||
DOI 10.17487/RFC2119, March 1997,
|
DOI 10.17487/RFC2119, March 1997,
|
||||||
<https://www.rfc-editor.org/info/rfc2119>.
|
<https://www.rfc-editor.org/info/rfc2119>.
|
||||||
|
|
||||||
[RFC2234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
|
[RFC1035] Mockapetris, P., "Domain names - implementation and
|
||||||
Specifications: ABNF", RFC 2234, DOI 10.17487/RFC2234,
|
specification", STD 13, RFC 1035, DOI 10.17487/RFC1035,
|
||||||
November 1997, <https://www.rfc-editor.org/info/rfc2234>.
|
November 1987, <https://www.rfc-editor.org/info/rfc1035>.
|
||||||
|
|
||||||
[RFC3597] Gustafsson, A., "Handling of Unknown DNS Resource Record
|
|
||||||
(RR) Types", RFC 3597, DOI 10.17487/RFC3597, September
|
|
||||||
2003, <https://www.rfc-editor.org/info/rfc3597>.
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 9]
|
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
|
||||||
|
|
||||||
|
[RFC1034] Mockapetris, P., "Domain names - concepts and facilities",
|
||||||
|
STD 13, RFC 1034, DOI 10.17487/RFC1034, November 1987,
|
||||||
|
<https://www.rfc-editor.org/info/rfc1034>.
|
||||||
|
|
||||||
[RFC3912] Daigle, L., "WHOIS Protocol Specification", RFC 3912,
|
[RFC3912] Daigle, L., "WHOIS Protocol Specification", RFC 3912,
|
||||||
DOI 10.17487/RFC3912, September 2004,
|
DOI 10.17487/RFC3912, September 2004,
|
||||||
<https://www.rfc-editor.org/info/rfc3912>.
|
<https://www.rfc-editor.org/info/rfc3912>.
|
||||||
|
|
||||||
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
|
|
||||||
Resource Identifier (URI): Generic Syntax", STD 66,
|
|
||||||
RFC 3986, DOI 10.17487/RFC3986, January 2005,
|
|
||||||
<https://www.rfc-editor.org/info/rfc3986>.
|
|
||||||
|
|
||||||
[RFC4627] Crockford, D., "The application/json Media Type for
|
[RFC4627] Crockford, D., "The application/json Media Type for
|
||||||
JavaScript Object Notation (JSON)", RFC 4627,
|
JavaScript Object Notation (JSON)", RFC 4627,
|
||||||
DOI 10.17487/RFC4627, July 2006,
|
DOI 10.17487/RFC4627, July 2006,
|
||||||
<https://www.rfc-editor.org/info/rfc4627>.
|
<https://www.rfc-editor.org/info/rfc4627>.
|
||||||
|
|
||||||
|
[RFC3597] Gustafsson, A., "Handling of Unknown DNS Resource Record
|
||||||
|
(RR) Types", RFC 3597, DOI 10.17487/RFC3597, September
|
||||||
|
2003, <https://www.rfc-editor.org/info/rfc3597>.
|
||||||
|
|
||||||
[RFC6648] Saint-Andre, P., Crocker, D., and M. Nottingham,
|
[RFC6648] Saint-Andre, P., Crocker, D., and M. Nottingham,
|
||||||
"Deprecating the "X-" Prefix and Similar Constructs in
|
"Deprecating the "X-" Prefix and Similar Constructs in
|
||||||
Application Protocols", BCP 178, RFC 6648,
|
Application Protocols", BCP 178, RFC 6648,
|
||||||
DOI 10.17487/RFC6648, June 2012,
|
DOI 10.17487/RFC6648, June 2012,
|
||||||
<https://www.rfc-editor.org/info/rfc6648>.
|
<https://www.rfc-editor.org/info/rfc6648>.
|
||||||
|
|
||||||
|
[RFC2234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
|
||||||
|
Specifications: ABNF", RFC 2234, DOI 10.17487/RFC2234,
|
||||||
|
November 1997, <https://www.rfc-editor.org/info/rfc2234>.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 10]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
[RFC6973] Cooper, A., Tschofenig, H., Aboba, B., Peterson, J.,
|
[RFC6973] Cooper, A., Tschofenig, H., Aboba, B., Peterson, J.,
|
||||||
Morris, J., Hansen, M., and R. Smith, "Privacy
|
Morris, J., Hansen, M., and R. Smith, "Privacy
|
||||||
Considerations for Internet Protocols", RFC 6973,
|
Considerations for Internet Protocols", RFC 6973,
|
||||||
DOI 10.17487/RFC6973, July 2013,
|
DOI 10.17487/RFC6973, July 2013,
|
||||||
<https://www.rfc-editor.org/info/rfc6973>.
|
<https://www.rfc-editor.org/info/rfc6973>.
|
||||||
|
|
||||||
8.2. References
|
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
|
||||||
|
Resource Identifier (URI): Generic Syntax", STD 66,
|
||||||
|
RFC 3986, DOI 10.17487/RFC3986, January 2005,
|
||||||
|
<https://www.rfc-editor.org/info/rfc3986>.
|
||||||
|
|
||||||
[BAILIWICK]
|
[RFC7258] Farrell, S. and H. Tschofenig, "Pervasive Monitoring Is an
|
||||||
Edmonds, R., "Passive DNS Hardening", 2010,
|
Attack", BCP 188, RFC 7258, DOI 10.17487/RFC7258, May
|
||||||
<https://archive.farsightsecurity.com/Passive_DNS/
|
2014, <https://www.rfc-editor.org/info/rfc7258>.
|
||||||
passive_dns_hardening_handout.pdf>.
|
|
||||||
|
|
||||||
[CACHEPOISONING]
|
[WEIMERPDNS]
|
||||||
Kaminsky, D., "Black ops 2008: It's the end of the cache
|
Weimer, F., "Passive DNS Replication", 2005,
|
||||||
as we know it.", 2008,
|
<http://www.enyo.de/fw/software/dnslogger/
|
||||||
<http://kurser.lobner.dk/dDist/DMK_BO2K8.pdf>.
|
first2005-paper.pdf>.
|
||||||
|
|
||||||
[DNSDB] Security, F., "DNSDB API", 2013,
|
|
||||||
<https://api.dnsdb.info/>.
|
|
||||||
|
|
||||||
[DNSDBQ] Vixie, P., "DNSDB API Client, C Version", 2018,
|
|
||||||
<https://github.com/dnsdb/dnsdbq>.
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 10]
|
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
|
||||||
|
|
||||||
|
[PDNSCOF] Dulaunoy, D. P. A., "Passive DNS server interface using
|
||||||
|
the common output format", 2019,
|
||||||
|
<https://github.com/D4-project/analyzer-d4-passivedns/>.
|
||||||
|
|
||||||
[github_issue_17]
|
[github_issue_17]
|
||||||
et.al, P. V. W. A. K., "Discussion on the existing
|
et.al, P. V. W. A. K., "Discussion on the existing
|
||||||
|
|
@ -568,6 +592,39 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
OR time_{first,last}", 2020,
|
OR time_{first,last}", 2020,
|
||||||
<https://github.com/adulau/pdns-qof/issues/17>.
|
<https://github.com/adulau/pdns-qof/issues/17>.
|
||||||
|
|
||||||
|
9. Informative References
|
||||||
|
|
||||||
|
[RFC7871] Contavalli, C., van der Gaast, W., Lawrence, D., and W.
|
||||||
|
Kumari, "Client Subnet in DNS Queries", RFC 7871,
|
||||||
|
DOI 10.17487/RFC7871, May 2016,
|
||||||
|
<https://www.rfc-editor.org/info/rfc7871>.
|
||||||
|
|
||||||
|
[BAILIWICK]
|
||||||
|
Edmonds, R., "Passive DNS Hardening", 2010,
|
||||||
|
<https://archive.farsightsecurity.com/Passive_DNS/
|
||||||
|
passive_dns_hardening_handout.pdf>.
|
||||||
|
|
||||||
|
[PDNSCLIENT]
|
||||||
|
Lee, C., "Queries 5 major Passive DNS databases: BFK,
|
||||||
|
CERTEE, DNSParse, ISC, and VirusTotal.", 2013,
|
||||||
|
<https://github.com/chrislee35/passivedns-client>.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 11]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
|
[REST] Fielding, R. T., "Representational State Transfer (REST)",
|
||||||
|
2000, <http://www.ics.uci.edu/~fielding/pubs/dissertation/
|
||||||
|
rest_arch_style.htm>.
|
||||||
|
|
||||||
|
[DNSDB] Security, F., "DNSDB API", 2013,
|
||||||
|
<https://api.dnsdb.info/>.
|
||||||
|
|
||||||
[PDNSCERTAT]
|
[PDNSCERTAT]
|
||||||
CERT.at, "pDNS presentation at 4th Centr R&D workshop
|
CERT.at, "pDNS presentation at 4th Centr R&D workshop
|
||||||
Frankfurt Jun 5th 2012", 2012,
|
Frankfurt Jun 5th 2012", 2012,
|
||||||
|
|
@ -578,25 +635,8 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
Luxembourg, C. -. I. R. C., "CIRCL Passive DNS", 2012,
|
Luxembourg, C. -. I. R. C., "CIRCL Passive DNS", 2012,
|
||||||
<https://www.circl.lu/services/passive-dns/>.
|
<https://www.circl.lu/services/passive-dns/>.
|
||||||
|
|
||||||
[PDNSCLIENT]
|
[DNSDBQ] Vixie, P., "DNSDB API Client, C Version", 2018,
|
||||||
Lee, C., "Queries 5 major Passive DNS databases: BFK,
|
<https://github.com/dnsdb/dnsdbq>.
|
||||||
CERTEE, DNSParse, ISC, and VirusTotal.", 2013,
|
|
||||||
<https://github.com/chrislee35/passivedns-client>.
|
|
||||||
|
|
||||||
[PDNSCOF] Dulaunoy, D. P. A., "Passive DNS server interface using
|
|
||||||
the common output format", 2019,
|
|
||||||
<https://github.com/D4-project/analyzer-d4-passivedns/>.
|
|
||||||
|
|
||||||
[REST] Fielding, R. T., "Representational State Transfer (REST)",
|
|
||||||
2000, <http://www.ics.uci.edu/~fielding/pubs/dissertation/
|
|
||||||
rest_arch_style.htm>.
|
|
||||||
|
|
||||||
[WEIMERPDNS]
|
|
||||||
Weimer, F., "Passive DNS Replication", 2005,
|
|
||||||
<http://www.enyo.de/fw/software/dnslogger/
|
|
||||||
first2005-paper.pdf>.
|
|
||||||
|
|
||||||
8.3. Informative References
|
|
||||||
|
|
||||||
Appendix A. Examples
|
Appendix A. Examples
|
||||||
|
|
||||||
|
|
@ -606,18 +646,6 @@ Appendix A. Examples
|
||||||
If you query a passive DNS for the rrname www.ietf.org, the passive
|
If you query a passive DNS for the rrname www.ietf.org, the passive
|
||||||
dns common output format can be:
|
dns common output format can be:
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 11]
|
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
|
||||||
|
|
||||||
|
|
||||||
{"count": 102, "time_first": 1298412391, "rrtype": "AAAA",
|
{"count": 102, "time_first": 1298412391, "rrtype": "AAAA",
|
||||||
"rrname": "www.ietf.org", "rdata": "2001:1890:1112:1::20",
|
"rrname": "www.ietf.org", "rdata": "2001:1890:1112:1::20",
|
||||||
"time_last": 1302506851}
|
"time_last": 1302506851}
|
||||||
|
|
@ -625,9 +653,27 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
"rrname": "www.ietf.org", "rdata": "4.31.198.44",
|
"rrname": "www.ietf.org", "rdata": "4.31.198.44",
|
||||||
"time_last": 1389022219}
|
"time_last": 1389022219}
|
||||||
|
|
||||||
|
Figure 2
|
||||||
|
|
||||||
If you query a passive DNS for the rrname ietf.org, the passive dns
|
If you query a passive DNS for the rrname ietf.org, the passive dns
|
||||||
common output format can be:
|
common output format can be:
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 12]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
{"count": 109877, "time_first": 1298398002, "rrtype": "NS",
|
{"count": 109877, "time_first": 1298398002, "rrtype": "NS",
|
||||||
"rrname": "ietf.org", "rdata": "ns1.yyz1.afilias-nst.info",
|
"rrname": "ietf.org", "rdata": "ns1.yyz1.afilias-nst.info",
|
||||||
"time_last": 1389095375}
|
"time_last": 1389095375}
|
||||||
|
|
@ -638,6 +684,8 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
"rrname": "ietf.org", "rdata": "2001:1890:123a::1:1e",
|
"rrname": "ietf.org", "rdata": "2001:1890:123a::1:1e",
|
||||||
"time_last": 1330209752}
|
"time_last": 1330209752}
|
||||||
|
|
||||||
|
Figure 3
|
||||||
|
|
||||||
Please note that the examples imply that a single query returns a
|
Please note that the examples imply that a single query returns a
|
||||||
single set of JSON objects. For example, two queries were made; one
|
single set of JSON objects. For example, two queries were made; one
|
||||||
query returned a set of two JSON objects and the other query returned
|
query returned a set of two JSON objects and the other query returned
|
||||||
|
|
@ -655,7 +703,7 @@ Authors' Addresses
|
||||||
Alexandre Dulaunoy
|
Alexandre Dulaunoy
|
||||||
CIRCL
|
CIRCL
|
||||||
122, rue Adolphe Fischer
|
122, rue Adolphe Fischer
|
||||||
L-1521 Luxembourg
|
L-L-1521 Luxembourg
|
||||||
Luxembourg
|
Luxembourg
|
||||||
Phone: (+352) 247 88444
|
Phone: (+352) 247 88444
|
||||||
Email: alexandre.dulaunoy@circl.lu
|
Email: alexandre.dulaunoy@circl.lu
|
||||||
|
|
@ -668,18 +716,20 @@ Authors' Addresses
|
||||||
Email: aaron@lo-res.org
|
Email: aaron@lo-res.org
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 12]
|
|
||||||
|
|
||||||
Internet-Draft Passive DNS - Common Output Format April 2024
|
|
||||||
|
|
||||||
|
|
||||||
Paul Vixie
|
Paul Vixie
|
||||||
Farsight Security, Inc.
|
Farsight Security, Inc.
|
||||||
11400 La Honda Road
|
11400 La Honda Road
|
||||||
Woodside, California 94062
|
Woodside, California 94062
|
||||||
United States of America
|
United States of America
|
||||||
Email: paul@redbarn.org
|
Email: paul@redbarn.org
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 13]
|
||||||
|
|
||||||
|
Internet-Draft Passive DNS - Common Output Format August 2024
|
||||||
|
|
||||||
|
|
||||||
URI: https://www.farsightsecurity.com/
|
URI: https://www.farsightsecurity.com/
|
||||||
|
|
||||||
|
|
||||||
|
|
@ -725,4 +775,10 @@ Internet-Draft Passive DNS - Common Output Format April 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
Dulaunoy, et al. Expires 29 October 2024 [Page 13]
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Dulaunoy, et al. Expires 28 February 2025 [Page 14]
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue