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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Kevin Burke‏ @derivativeburke 15 Aug 2019
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      Amazon could use public key encryption to verify the signature here - that way AWS doesn’t need a copy of the private key to verify the contents. Why would they use HMAC instead? https://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html …

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    2. Kevin Burke‏ @derivativeburke 15 Aug 2019
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      More generally a lot of API’s rely on storing the secret key on both the server and the client and I’m wondering why. The server can do authentication without needing the private key

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    3. Colm MacCárthaigh‏ @colmmacc 15 Aug 2019
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      Replying to @derivativeburke

      AWS SIGv4 auth uses double-HMAC in a construction that means the customer's credentials aren't on the server side; just small scoped ephemeral, service-specific, tokens that are valid for minutes to hours (varies by service) 😀 ...

      1 reply 1 retweet 3 likes
      Colm MacCárthaigh‏ @colmmacc 15 Aug 2019
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      Replying to @colmmacc @derivativeburke

      I know you know this, but password hashing is also a thing, you don't need to use asymmetric cryptography to protect against server compromise :) PKEY tends to discern itself when you want to use cards, Yubikeys, enclaves and offline signing.

      10:24 AM - 15 Aug 2019
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        1. Kevin Burke‏ @derivativeburke 15 Aug 2019
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          Replying to @colmmacc

          Sure though hashing only is effective because it’s expensive right? You don’t want to do eg a 100ms bcrypt hash on every operation

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        1. Kevin Burke‏ @derivativeburke 15 Aug 2019
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          Replying to @colmmacc

          (I don’t think I understand it that well to be honest! I understand hashing a password and comparing against a stored value. But I’m not sure how a stored hash on the server side could be used to compare against a HMAC which includes other, dynamically generated values)

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        2. Daniel Vassallo‏ @dvassallo 15 Aug 2019
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          Replying to @colmmacc @derivativeburke

          > "customer's credentials aren't on the server side" The specific services don't see them, but aren't the creds still stored in an Amazon-owned server somewhere?

          1 reply 0 retweets 1 like
        3. Colm MacCárthaigh‏ @colmmacc 15 Aug 2019
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          Replying to @dvassallo @derivativeburke

          They're vended from a KMS-like system (it predates KMS though); it's essentially a distributed HSM. Stores keys, but envelope encrypted (with actual HSMs and a threshold scheme at the bottom), and only releases tokens.

          0 replies 1 retweet 6 likes
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