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refactor(report): Replacing source_location in github report when scanning an image #5999

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merged 8 commits into from
Feb 22, 2024
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refactor(report): Replacing source_location in github report when scanning an image #5999

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458a30b
replacing `source_location` in github report when scanning an image
Maxim-Durand Jan 24, 2024
054833e
Update pkg/report/github/github.go
Maxim-Durand Jan 25, 2024
3c2d602
added test for image export to github using the full image_name and t…
Maxim-Durand Jan 26, 2024
b65ef00
Using `<image_registry>/<image_name>:<tag>@sha256:<image_hash>` forma…
Maxim-Durand Feb 3, 2024
077f52f
added comments about `RepoDigests` and `RepoTag` parsing and concaten…
Maxim-Durand Feb 5, 2024
dffe603
adding "source_location" of each package into their metadata field
Maxim-Durand Feb 6, 2024
c43fd98
Apply suggestions from DmitriyLewen review
Maxim-Durand Feb 19, 2024
fc53d37
lint fix
Maxim-Durand Feb 20, 2024
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25 changes: 23 additions & 2 deletions pkg/report/github/github.go
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Original file line number Diff line number Diff line change
Expand Up @@ -105,8 +105,25 @@ func (w Writer) Write(ctx context.Context, report types.Report) error {
manifest.Name = string(result.Type)
// show path for language-specific packages only
if result.Class == types.ClassLangPkg {
manifest.File = &File{
SrcLocation: result.Target,
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We aggregate some packages to 1 result -

trivy/pkg/fanal/applier/docker.go

Lines 263 to 291 in fb36c4e

func aggregate(detail *ftypes.ArtifactDetail) {
var apps []ftypes.Application
aggregatedApps := map[ftypes.LangType]*ftypes.Application{
ftypes.PythonPkg: {Type: ftypes.PythonPkg},
ftypes.CondaPkg: {Type: ftypes.CondaPkg},
ftypes.GemSpec: {Type: ftypes.GemSpec},
ftypes.NodePkg: {Type: ftypes.NodePkg},
ftypes.Jar: {Type: ftypes.Jar},
}
for _, app := range detail.Applications {
a, ok := aggregatedApps[app.Type]
if !ok {
apps = append(apps, app)
continue
}
a.Libraries = append(a.Libraries, app.Libraries...)
}
for _, app := range aggregatedApps {
if len(app.Libraries) > 0 {
apps = append(apps, *app)
}
}
// Overwrite Applications
detail.Applications = apps
}

But we can find path from Results.Packages.FilePath:

{
      "Target": "Python",
      "Class": "lang-pkgs",
      "Type": "python-pkg",
      "Packages": [
        {
          "Name": "pip",
          "Version": "23.2.1",
          "Licenses": [
            "MIT"
          ],
          "Layer": {
            "DiffID": "sha256:a7d483b6066e2ed6c9cd1d5890a93326e3f192ef6e537c046296053fa547a844"
          },
          "FilePath": "usr/local/lib/python3.12/site-packages/pip-23.2.1.dist-info/METADATA"
        },

Maybe we just use FilePath for these packages?

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Although I agree with you it's an interesting change as it would make the manifest more precise.

Nonetheless, I think the full FilePath would be too much to render in Github Dependency and would bloat the UI.
I can do a test with that change if you want and show the results here ?

Otherwise we could try to extract important values from the FilePath and adding them to result.Target, but that seems complex and prone to errors.

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For other languages we already use filePath (filePath is stored in target):

➜  5999 trivy -d fs -f github .  | jq .manifests
...
{
  "foo/bar/requirements.txt": {
    "name": "pip",
    "file": {
      "source_location": "foo/bar/requirements.txt"
    },
    "resolved": {
      "click": {
        "package_url": "pkg:pypi/[email protected]",
        "relationship": "direct",
        "scope": "runtime"
      }
    }
  }
}

And we didn't get issues about UI.

I can do a test with that change if you want and show the results here ?

Yes please. If you have time, check it out.

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@Maxim-Durand Maxim-Durand Jan 26, 2024 •
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So I have a few things to report:

  1. As you pointed out trivy aggregates multiple packages in the same "App" (for instance Python or Node) into one result.
    The issue is that in the sbom format, the source_location is set at the manifest level not at the package level (resolved key in sbom format). Meaning, if we keep the default trivy aggregation then we have to use only one of all the packages FilePath. How to define that value is either arbitrary, or we need some sort of heuristic ?

  2. In terms of UI it isn't as bloated as I expected, so I think you're right and it's ok to use.
    Screenshot_20240126_150104
    The source_location used in the above screenshot is simply the FilePath of the last package in result.Packages so it's not even correct.

  3. In the case trivy is scanning an image I think it's still pretty useless to replace the manifest's source_location with this FilePath value and we should instead reference the image's name and tag.

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Meaning, if we keep the default trivy aggregation then we have to use only one of all the packages FilePath. How to define that value is either arbitrary, or we need some sort of heuristic ?

We have already seen cases where it is necessary to remove aggregation, but this requires large changes and we are not sure about it.
I created a small function to get filePath for each package - DmitriyLewen@8431664
Can you take a look?

In the case trivy is scanning an image I think it's still pretty useless to replace the manifest's source_location with this FilePath value and we should instead reference the image's name and tag.

This makes sense for UI. But what worries me is case where user only knows that image contains vulnerable package, but doesn't have filePath to find and update that package. It would be great to add filePath somehow.
e.g. we can use <image_name>:<tag> - <filePath> format for manifest map key. Is it possible to see gsbom file after uploading to GitHub?

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Not that I can see in Github Dependency UI no, see screenshot below to see how it looks.

Screenshot_20240208_065410

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@DmitriyLewen DmitriyLewen Feb 9, 2024 •
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So user can only get package metadata when taking snapshot, right?

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@Maxim-Durand Maxim-Durand Feb 9, 2024 •
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If they use trivy then there's no issue as the user will now be able to find the file path for each package by parsing the JSON report before sending it to GitHub.

But if they use trivy-action then the report is sent automatically and the user doesn't have access to the original report hence he wouldn't be able to parse it.
Maybe if the user then export it from GitHub, the metadata tag with each package file path will still be there, I'll test that.

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@Maxim-Durand Maxim-Durand Feb 9, 2024 •
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This is what I got from github export to SBOM for the same package as in #5999 (comment):

{
      "SPDXID": "SPDXRef-pip-pillow-10.1.0",
      "name": "pip:pillow",
      "versionInfo": "10.1.0",
      "downloadLocation": "NOASSERTION",
      "filesAnalyzed": false,
      "licenseConcluded": "CAL-1.0",
      "supplier": "NOASSERTION",
      "externalRefs": [
        {
          "referenceCategory": "PACKAGE-MANAGER",
          "referenceLocator": "pkg:pypi/[email protected]",
          "referenceType": "purl"
        }
      ]
    },

As you can see the metadata tag doesn't show up in the exported SBOM.

Important

Conclusion: users of trivy-action would currently have no way of finding out the filePath of each package when using the github format.

As this issue only involves trivy-action and not trivy itself anymore, I think we should continue this discussion once this PR is merged to find a solution for trivy-action users at aquasecurity/trivy-action#286
(I would recommend to add an option for upload as an artifact so that user can easily fetch the report).

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I created aquasecurity/trivy-action#307 to make sure users of trivy-action will know where to find the missing details from Github Dependency.

@DmitriyLewen and @knqyf263 do you agree with this compromise ?
If so, can you review this PR code ?

if report.ArtifactType == ftypes.ArtifactContainerImage {
// `RepoDigests` ~= <registry>/<image_name>@sha256:<image_hash>
// `RepoTag` ~= <registry>/<image_name>:<image_tag>
// By concatenating the hash from `RepoDigests` at the end of `RepoTag` we get all the information
imageReference := strings.Join(report.Metadata.RepoTags, ", ")
imageWithHash := strings.Join(report.Metadata.RepoDigests, ", ")
_, imageHash, found := strings.Cut(imageWithHash, "@")
if found {
imageReference += "@" + imageHash
}
// Replacing `source_location` in manifest by the image name, tag and hash
manifest.File = &File{
SrcLocation: imageReference,
}

} else {
manifest.File = &File{
SrcLocation: result.Target,
}
}
}

Expand All @@ -123,6 +140,10 @@ func (w Writer) Write(ctx context.Context, report types.Report) error {
return xerrors.Errorf("unable to build purl for %s: %w", pkg.Name, err)
}

if pkg.FilePath != "" {
githubPkg.Metadata = Metadata{"source_location": pkg.FilePath}
}

resolved[pkg.Name] = githubPkg
}

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67 changes: 67 additions & 0 deletions pkg/report/github/github_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -164,6 +164,73 @@ func TestWriter_Write(t *testing.T) {
},
},
},
{
name: "pypi from image",
report: types.Report{
SchemaVersion: 2,
ArtifactName: "fake_repo.azurecr.io/image_name",
ArtifactType: "container_image",
Metadata: types.Metadata{
RepoDigests: []string{"fake_repo.azurecr.io/image_name@sha256:a7c92cdcb3d010f6edeb37ddcdbacab14981aa31e7f1140e0097dc1b8e834c49"},
RepoTags: []string{"fake_repo.azurecr.io/image_name:latest"},
},
Results: types.Results{
{
Target: "Python",
Class: "lang-pkgs",
Type: "python-pkg",
Packages: []ftypes.Package{
{
Name: "jwcrypto",
Version: "0.7",
Licenses: []string{
"LGPLv3+",
},
Layer: ftypes.Layer{
Digest: "sha256:ddc612ba4e74ea5633a93e19e7c32f61f5f230073b21a070302a61ef5eec5c50",
DiffID: "sha256:12935ef6ce21a266aef8df75d601cebf7e935edd01e9f19fab16ccb78fbb9a5e",
},
FilePath: "opt/pyenv/versions/3.11.2/lib/python3.11/site-packages/jwcrypto-0.7.dist-info/METADATA",
},
{
Name: "matplotlib",
Version: "3.5.3",
Licenses: []string{
"PSF",
},
Layer: ftypes.Layer{
Digest: "sha256:ddc612ba4e74ea5633a93e19e7c32f61f5f230073b21a070302a61ef5eec5c50",
DiffID: "sha256:12935ef6ce21a266aef8df75d601cebf7e935edd01e9f19fab16ccb78fbb9a5e",
},
FilePath: "opt/pyenv/versions/3.11.2/lib/python3.11/site-packages/matplotlib-3.5.3.dist-info/METADATA",
},
},
},
},
},
want: map[string]github.Manifest{
"Python": {
Name: "python-pkg",
File: &github.File{
SrcLocation: "fake_repo.azurecr.io/image_name:latest@sha256:a7c92cdcb3d010f6edeb37ddcdbacab14981aa31e7f1140e0097dc1b8e834c49",
},
Resolved: map[string]github.Package{
"jwcrypto": {
PackageUrl: "pkg:pypi/[email protected]",
Relationship: "direct",
Scope: "runtime",
Metadata: github.Metadata{"source_location": "opt/pyenv/versions/3.11.2/lib/python3.11/site-packages/jwcrypto-0.7.dist-info/METADATA"},
},
"matplotlib": {
PackageUrl: "pkg:pypi/[email protected]",
Relationship: "direct",
Scope: "runtime",
Metadata: github.Metadata{"source_location": "opt/pyenv/versions/3.11.2/lib/python3.11/site-packages/matplotlib-3.5.3.dist-info/METADATA"},
},
},
},
},
},
}

for _, tt := range tests {
Expand Down
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