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fix: allow valid cyclonedx input with no components #1873

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merged 3 commits into from
Jul 11, 2023

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jneate
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@jneate jneate commented Jun 11, 2023

This resolves anchore/grype#1005

The cyclonedx-go library returns Nil when presented with:

<components></components>

But returns an empty slice when presented with:

"components": []

The fix is to check if the format is XML, then inspect the XMLNS field and for other formats inspect the Components field

Signed-off-by: James Neate <jamesmneate@gmail.com>
Signed-off-by: James Neate <jamesmneate@gmail.com>
Comment on lines 29 to 36
if format == cyclonedx.BOMFileFormatXML {
if (!strings.Contains(bom.XMLNS, cycloneDXXmlSchema) || cyclonedx.BOM{} == *bom) {
return fmt.Errorf("not a valid CycloneDX document")
}
} else {
if (bom.Components == nil || cyclonedx.BOM{} == *bom) {
return fmt.Errorf("not a valid CycloneDX document")
}
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Having nested if statements like this duplicates some of the logic and makes things a little harder to reason about. What about a change like this?

Suggested change
if format == cyclonedx.BOMFileFormatXML {
if (!strings.Contains(bom.XMLNS, cycloneDXXmlSchema) || cyclonedx.BOM{} == *bom) {
return fmt.Errorf("not a valid CycloneDX document")
}
} else {
if (bom.Components == nil || cyclonedx.BOM{} == *bom) {
return fmt.Errorf("not a valid CycloneDX document")
}
xmlWithoutNS := format == cyclonedx.BOMFileFormatXML && !strings.Contains(bom.XMLNS, cycloneDXXmlSchema)
if cyclonedx.BOM{} == *bom || bom.Components == nil || xmlWithoutNS {
return fmt.Errorf("not a valid CycloneDX document")
}

@spiffcs spiffcs self-assigned this Jul 11, 2023
Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>
@spiffcs spiffcs merged commit 5a7c200 into anchore:main Jul 11, 2023
GijsCalis pushed a commit to GijsCalis/syft that referenced this pull request Feb 19, 2024
fix: allow valid cyclonedx input with no components
---------

Signed-off-by: James Neate <jamesmneate@gmail.com>
Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>
Co-authored-by: Christopher Phillips <christopher.phillips@anchore.com>
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Failed to detect format of CycloneDX XML SBOM with no components
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