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Roland Hougs
5+ years ago…
API Gateway EC2
S3
database
5+ years ago…
API Gateway EC2
S3
database
2019
5+ years ago…
• Server/resource architecture
• Regulate access to resources
• InfoSec concern
2019
• Microservices architecture
• Enforce contracts between (micro) services
• Software design concern
5+ years ago…
• Broad, complex policies
• Role reuse
• Start off with lax blueprints
Another way!
• Tiny, single-action policies
• Unique roles
• Blank canvas
Step 1 (no code)
• Create new, unique role
• Mix and match single-purpose policies
Example: adding Lambda function
Step 1 (no code)
Example: adding Lambda function
Step 1 (no code)
Example: adding Lambda function
Step 1 (no code)
Example: adding Lambda function
Step 2
• Write the code
• Test it
• Encounter an IAM error?
• Information about access patterns (= cash!)
Example: adding Lambda function
Layers
Example: adding Lambda function
lambda_A lambda_B
shared_func
layer
Layers
Example: adding Lambda function
lambda_A lambda_B
shared_func
layer
getItem
scan
Layers
Example: adding Lambda function
With an IAM-first approach we gain:
• free, continuous enforcement of contracts
between services
• an easy, building-block technique for designing
our architecture
• clean, easy-to-read policies
• reduced risk of unexpected bills
• AWS in 2019 mirrors language design of 1980s
• Objects / processes that pass messages between one
another
• SmallTalk, Erlang…
• Since then: strong typing and access annotation
• Don’t yet have strong typing
• … but IAM policies are a form of access annotation
Final thought…
Questions?

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IAM is your friend

  • 2. 5+ years ago… API Gateway EC2 S3 database
  • 3. 5+ years ago… API Gateway EC2 S3 database
  • 5. 5+ years ago… • Server/resource architecture • Regulate access to resources • InfoSec concern 2019 • Microservices architecture • Enforce contracts between (micro) services • Software design concern
  • 6. 5+ years ago… • Broad, complex policies • Role reuse • Start off with lax blueprints Another way! • Tiny, single-action policies • Unique roles • Blank canvas
  • 7. Step 1 (no code) • Create new, unique role • Mix and match single-purpose policies Example: adding Lambda function
  • 8. Step 1 (no code) Example: adding Lambda function
  • 9. Step 1 (no code) Example: adding Lambda function
  • 10. Step 1 (no code) Example: adding Lambda function
  • 11. Step 2 • Write the code • Test it • Encounter an IAM error? • Information about access patterns (= cash!) Example: adding Lambda function
  • 12. Layers Example: adding Lambda function lambda_A lambda_B shared_func layer
  • 13. Layers Example: adding Lambda function lambda_A lambda_B shared_func layer getItem scan
  • 15. With an IAM-first approach we gain: • free, continuous enforcement of contracts between services • an easy, building-block technique for designing our architecture • clean, easy-to-read policies • reduced risk of unexpected bills
  • 16. • AWS in 2019 mirrors language design of 1980s • Objects / processes that pass messages between one another • SmallTalk, Erlang… • Since then: strong typing and access annotation • Don’t yet have strong typing • … but IAM policies are a form of access annotation Final thought…