fix: add COSIGN_EXPERIMENTAL=1 for verify-bloba #2254

developer-guy · 2022-09-15T15:47:04Z

Signed-off-by: Batuhan Apaydın batuhan.apaydin@trendyol.com

Summary

Release Note

Documentation

haydentherapper · 2022-09-15T15:48:45Z

/hold

Most of these cases do no require the flag.

codecov-commenter · 2022-09-15T15:49:55Z

Codecov Report

Merging #2254 (4e729c3) into main (f43839b) will increase coverage by 0.16%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2254      +/-   ##
==========================================
+ Coverage   28.40%   28.57%   +0.16%     
==========================================
  Files         131      131              
  Lines        7832     7852      +20     
==========================================
+ Hits         2225     2244      +19     
+ Misses       5309     5302       -7     
- Partials      298      306       +8

Impacted Files	Coverage Δ
cmd/cosign/cli/verify.go	`0.00% <0.00%> (ø)`
cmd/cosign/cli/verify/verify_blob.go	`45.26% <0.00%> (+0.35%)`	⬆️
cmd/cosign/cli/verify/verify.go	`5.97% <0.00%> (+2.61%)`	⬆️

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haydentherapper · 2022-09-15T15:58:42Z

cmd/cosign/cli/verify.go


  # Verify a simple blob and message
-  cosign verify-blob --key cosign.pub --signature sig msg
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --key cosign.pub --signature sig msg


no flag required for all examples with a key

+1, including the KMS ones. Anything without --certificate I think

haydentherapper · 2022-09-15T15:59:28Z

cmd/cosign/cli/verify.go


  # Verify a signature against a certificate
-  cosign verify-blob --cert <cert> --signature $sig <blob>
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --cert <cert> --signature $sig <blob>


Can we update to --certificate?

haydentherapper · 2022-09-15T16:01:12Z

cmd/cosign/cli/verify.go


  # Verify a signature against a certificate
-  cosign verify-blob --cert <cert> --signature $sig <blob>
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --cert <cert> --signature $sig <blob>
 `,


@asraa Should we use the list you made of all possible flag combos (cert/key, experimental/no experimental, bundle, expired/unexpired cert) and have an example for each of these with more explanation?

+1

Further, I'd like to see some organization and explanation. Right now, the text is just a laundry list of "if X, then Y"

We should explain unset COSIGN_EXPERIMENTAL and COSIGN_EXPERIMENTAL=1 separately (I don't 100% understand the current behavior so please correct me, indicated uncertainty with "?")

Here's a braindump, maybe should move into Google Doc (feel free to copy it)

no experimental

Check the signature on a blob against the given key or certificate.

Keys

blah

Certificates

--certificate and --certificate-chain example:

The provided certificate (and all of the certificates in the chain(?) must be unexpired right now.

NOTE: this just accepts whatever the last certificate of the chain is as your root. If you want to check that it matches a fixed root certificate, use keyless mode and SIGSTORE_ROOT_FILE (except we don't want people to do that? what do we tell these people?)

--certificate no chain

Checks that the certificate is signed by Fulcio (must be unexpired). Will that ever work?

Bundles

--bundle

If --bundle is provided, use the given Rekor bundle (see ...) to check that the time of the signature was while the certificate (and its ancestors??) were valid (without --bundle, the certificate must be currently valid).

Works for keys and certs both.

What happens if the bundle has a conflicting chain?

--bundle + certs, no chain

If there's a bundle use that to get the chain up to Fulcio?

experimental

Keys

Same as above, but we check that signatures are in Rekor (I think?)

If --bundle provided, check that against Rekor (offline).

Certs

--certificate and --certificate-chain: Like the keyfull version, except instead of automatically trusting the certificate chain, we check that the root matches Fulcio's cert.

If you'd like to BYO-root, set SIGSTORE_ROOT_FILE and we'll compare the root of the chain against that.

We hit Rekor online.

--certificate, no chain: this would only work if signed by the root directly, which probably won't be the case (maybe if you BYO-root?)

Bundles

--keys Same as above, don't hit Rekor.

--certificate and --certificate-chain and --bundle. Same as above, don't hit rekor

TODO: what if bundle has a conflicting cert/chain?

--certificate and --bundle: Same, but use a chain from bundle. Fails if bundle has no chain.

TODO: what happens if the bundle has a conflicting cert?

--bundle: Same, but use cert/chain from bundle. Fails if bundle has no cert/chain.

TODO: if the bundle just provides a key, do we trust it?

znewman01 · 2022-09-15T17:15:53Z

cmd/cosign/cli/verify.go


  # Verify a simple blob with remote signature URL, both http and https schemes are supported
-  cosign verify-blob --key cosign.pub --signature http://host/my.sig
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --key cosign.pub --signature http://host/my.sig

  # Verify a signature from an environment variable


let's axe this example? it's just explaining how the environment variables work in a shell, I think

znewman01 · 2022-09-15T17:16:16Z

cmd/cosign/cli/verify.go


  # Verify a signature from an environment variable
-  cosign verify-blob --key cosign.pub --signature $sig msg
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --key cosign.pub --signature $sig msg

  # verify a signature with public key provided by URL


Can we combine this with the "signature from URL" example?

znewman01 · 2022-09-15T17:17:05Z

cmd/cosign/cli/verify.go


  # verify a signature with public key provided by URL
-  cosign verify-blob --key https://host.for/<FILE> --signature $sig msg
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --key https://host.for/<FILE> --signature $sig msg

  # Verify a signature against a payload from another process using process redirection


IMO, axe this example. Maybe we can move it to the docs/ directory of the Cosign repo. Or even a "useful tricks" section at the bottom of this doc.

znewman01 · 2022-09-15T17:17:32Z

cmd/cosign/cli/verify.go


  # Verify a signature against a payload from another process using process redirection
-  cosign verify-blob --key cosign.pub --signature $sig <(git rev-parse HEAD)
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --key cosign.pub --signature $sig <(git rev-parse HEAD)

  # Verify a signature against Azure Key Vault


I would like to combine all the KMS examples. It'd be nice to list the syntax for each, but I don't need it in the full context.

znewman01 · 2022-09-15T17:18:37Z

cmd/cosign/cli/verify.go


  # Verify a simple blob and message
-  cosign verify-blob --key cosign.pub --signature sig msg
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --key cosign.pub --signature sig msg


+1, including the KMS ones. Anything without --certificate I think

znewman01 · 2022-09-15T17:19:14Z

cmd/cosign/cli/verify.go


  # verify a signature with public key provided by URL
-  cosign verify-blob --key https://host.for/<FILE> --signature $sig msg
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --key https://host.for/<FILE> --signature $sig msg


s/$sig/<sig>

znewman01 · 2022-09-15T17:42:24Z

cmd/cosign/cli/verify.go


  # Verify a signature against a certificate
-  cosign verify-blob --cert <cert> --signature $sig <blob>
+  COSIGN_EXPERIMENTAL=1 cosign verify-blob --cert <cert> --signature $sig <blob>
 `,


+1

Further, I'd like to see some organization and explanation. Right now, the text is just a laundry list of "if X, then Y"

We should explain unset COSIGN_EXPERIMENTAL and COSIGN_EXPERIMENTAL=1 separately (I don't 100% understand the current behavior so please correct me, indicated uncertainty with "?")

Here's a braindump, maybe should move into Google Doc (feel free to copy it)

no experimental

Check the signature on a blob against the given key or certificate.

Keys

blah

Certificates

--certificate and --certificate-chain example:

The provided certificate (and all of the certificates in the chain(?) must be unexpired right now.

NOTE: this just accepts whatever the last certificate of the chain is as your root. If you want to check that it matches a fixed root certificate, use keyless mode and SIGSTORE_ROOT_FILE (except we don't want people to do that? what do we tell these people?)

--certificate no chain

Checks that the certificate is signed by Fulcio (must be unexpired). Will that ever work?

Bundles

--bundle

If --bundle is provided, use the given Rekor bundle (see ...) to check that the time of the signature was while the certificate (and its ancestors??) were valid (without --bundle, the certificate must be currently valid).

Works for keys and certs both.

What happens if the bundle has a conflicting chain?

--bundle + certs, no chain

If there's a bundle use that to get the chain up to Fulcio?

experimental

Keys

Same as above, but we check that signatures are in Rekor (I think?)

If --bundle provided, check that against Rekor (offline).

Certs

--certificate and --certificate-chain: Like the keyfull version, except instead of automatically trusting the certificate chain, we check that the root matches Fulcio's cert.

If you'd like to BYO-root, set SIGSTORE_ROOT_FILE and we'll compare the root of the chain against that.

We hit Rekor online.

--certificate, no chain: this would only work if signed by the root directly, which probably won't be the case (maybe if you BYO-root?)

Bundles

--keys Same as above, don't hit Rekor.

--certificate and --certificate-chain and --bundle. Same as above, don't hit rekor

TODO: what if bundle has a conflicting cert/chain?

--certificate and --bundle: Same, but use a chain from bundle. Fails if bundle has no chain.

TODO: what happens if the bundle has a conflicting cert?

--bundle: Same, but use cert/chain from bundle. Fails if bundle has no cert/chain.

TODO: if the bundle just provides a key, do we trust it?

developer-guy · 2022-09-16T15:13:55Z

I tried to address some of the reviews. Can you please take a look at @znewman01? Thx

znewman01

I have a couple of minor issues, but otherwise I think this looks good. We may want to totally rework the docs here, but that can happen later.

cmd/cosign/cli/verify.go

Signed-off-by: Batuhan Apaydın <batuhan.apaydin@trendyol.com>

developer-guy requested review from asraa and znewman01 September 15, 2022 15:47

haydentherapper reviewed Sep 15, 2022

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znewman01 mentioned this pull request Sep 15, 2022

fix: fix cert chain validation for verify-blob in non-experimental mode #2256

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znewman01 reviewed Sep 15, 2022

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developer-guy force-pushed the feature/verify-blob branch 2 times, most recently from 0601020 to 1357e32 Compare September 16, 2022 15:13

developer-guy force-pushed the feature/verify-blob branch from 1357e32 to 8ae1b01 Compare September 16, 2022 15:33

znewman01 reviewed Sep 16, 2022

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fix: add COSIGN_EXPERIMENTAL=1 for verify-blob

4e729c3

Signed-off-by: Batuhan Apaydın <batuhan.apaydin@trendyol.com>

developer-guy force-pushed the feature/verify-blob branch from 8ae1b01 to 4e729c3 Compare September 17, 2022 07:34

developer-guy requested a review from znewman01 September 17, 2022 07:34

developer-guy self-assigned this Sep 17, 2022

dlorenc approved these changes Sep 18, 2022

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znewman01 approved these changes Sep 18, 2022

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dlorenc merged commit fde55b6 into sigstore:main Sep 18, 2022

github-actions bot added this to the v1.13.0 milestone Sep 18, 2022

wata727 mentioned this pull request Nov 14, 2022

Add COSIGN_EXPERIMENTAL=1 flag to the verification example terraform-linters/tflint#1588

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fix: add COSIGN_EXPERIMENTAL=1 for verify-bloba #2254

fix: add COSIGN_EXPERIMENTAL=1 for verify-bloba #2254

developer-guy commented Sep 15, 2022

haydentherapper commented Sep 15, 2022 •

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haydentherapper Sep 15, 2022

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developer-guy commented Sep 16, 2022

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fix: add COSIGN_EXPERIMENTAL=1 for verify-bloba #2254

fix: add COSIGN_EXPERIMENTAL=1 for verify-bloba #2254

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developer-guy commented Sep 15, 2022

Summary

Release Note

Documentation

haydentherapper commented Sep 15, 2022 • edited Loading

codecov-commenter commented Sep 15, 2022 • edited Loading

Codecov Report

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no experimental

Keys

Certificates

Bundles

experimental

Keys

Certs

Bundles

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no experimental

Keys

Certificates

Bundles

experimental

Keys

Certs

Bundles

developer-guy commented Sep 16, 2022

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haydentherapper commented Sep 15, 2022 •

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