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Review of draft-ietf-sidr-arch-01.txt. Steve Kent BBN Technologies. Document Outline. PKI Overview CA & EE Certificates Trust anchors ERX ROAs Repositories & Manifests Local Cache Maintenance Common Operations Certificate issuance ROA management Route filter generation.

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review of draft ietf sidr arch 01 txt

Review of draft-ietf-sidr-arch-01.txt

Steve Kent

BBN Technologies

document outline
Document Outline
  • PKI Overview
    • CA & EE Certificates
    • Trust anchors
    • ERX
  • ROAs
  • Repositories & Manifests
  • Local Cache Maintenance
  • Common Operations
    • Certificate issuance
    • ROA management
    • Route filter generation

bold/red = new material

pki section
PKI Section
  • All certificates are “resource certificates”
    • Attest to holdings of address space and/or AS numbers
  • CA certificates
    • Every resource holder is a CA
    • Resource holders can have multiple certificates
  • EE certificates
    • Used to verify non-PKI signed objects, e.g., ROAs and manifests
    • 1-1 correspondence with signed objects enables simple revocation
    • Single-use private key model improves security
  • Trust anchors
    • Choice of a TA is up to each relying party
    • the RIRs (or IANA) are the default TAs
pki section major changes
PKI Section Major Changes
  • Added certificate subject name conventions
    • Complements the certificate profile I-D
  • Added discussion of RIRs vs. IANA as candidate, default TAs
    • no conclusion, just a discussion of pros and cons
  • Added ERX discussion and diagram
    • Discusses how RIRs manage early registration allocations and how this is represented in the PKI
roa section
ROA Section
  • ROA definition
  • ROA content discussion
  • ROA syntax
  • ROA semantics
  • ROA revocation
roa section changes
ROA Section Changes
  • Added cites to ROA I-D
  • Revised syntax to add exact match flag
    • In response to on-list discussion
  • Added a diagram showing how allocations to one ISP from two sources affect certificate and ROA management
  • Need to add discussion of how to match prefix(es) represented in a ROA to RFC 3779 syntax in an EE certificate for ROA validation
repository system section
Repository System Section
  • What is stored
    • Certificates
    • CRLs
    • Signed objects that all users require, e.g., ROAs & manifests
  • Security considerations
    • Integrity of contents that are already signed
    • Availability
    • Need for access controls (but no spec for them)
  • Repository operations
    • Upload
    • Download
    • Change/delete
repository section changes
Repository Section Changes
  • Removed allusions to various details, will point to repository document for them
  • Inserted rough diagram showing how CRLDP, AIA and SIA link repository elements
  • Added discussion of manifests (syntax & semantics)
    • A manifest is a per-CA, signed blob used to detect certain forms of active attacks against the repository
    • Do we want a separate, short manifest document, like the ROA document?
local cache management section
Local Cache Management Section
  • A new section, added to explain part of how the repository is used by relying parties
  • Provides a simple algorithm describing how to maintain the local cache
  • Probably needs more details: please provide feedback
common operations section
Common Operations Section
  • Certificate issuance
  • ROA management
    • Ties to repository management
    • Single-homed subscribers
    • Multi-homed subscribers
    • Portable allocations
  • Constructing route filters using ROAs
operations section changes
Operations Section Changes
  • Added discussion of when certificates DON’T need to be issued
  • Added a discussion of dealing with 4-byte AS numbers in ASes that understand only 2-byte AS numbers
  • Still need to add top level discussion of certificate revocation and renewal, not just issuance
  • Cite <???> for certificate issuance, renewal, and revocation details
  • Need to add a discussion of how to match ROAs to BGP UPDATEs (should we do that here or in ROA document?)
  • Still need to add a discussion of how an ISP can use ROAs to verify that a subscriber is the holder of address space the subscriber wants the ISP to advertise