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x/net/publicsuffix: check for label in EffectiveTLDPlusOne #30652

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dcarriger opened this issue Mar 7, 2019 · 3 comments
Closed

x/net/publicsuffix: check for label in EffectiveTLDPlusOne #30652

dcarriger opened this issue Mar 7, 2019 · 3 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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@dcarriger
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dcarriger commented Mar 7, 2019

What version of Go are you using (go version)?

$ go version
go version go1.12 darwin/amd64

Does this issue reproduce with the latest release?

Yes

What did you do?

baseDomain, err := publicsuffix.EffectiveTLDPlusOne(".com.au")
fmt.Println(baseDomain, err)

What did you see?

.com.au 

What did you expect to see?

If the label is empty, I should get an error message indicating such.

@gopherbot gopherbot added this to the Unreleased milestone Mar 7, 2019
@bcmills
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bcmills commented Apr 12, 2019

CC @nigeltao @vdobler

@bcmills bcmills added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Apr 12, 2019
@vdobler
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vdobler commented Apr 16, 2019

Currently the main function PublicSuffix requires its argument to be in a certain form:

  • domain name
  • lowercase
  • punicoded
  • not full qualified

(from memory, not authoritative) and will happily apply its algorithm even to inputs in a different form. This problem is addressed in the TODO in https://github.com/golang/net/blob/master/publicsuffix/list.go#L47

This issue here belongs a bit into this category because PublicSuffix(".com.au") == "com.au", true but ".com.au" is not a domain name at all. It is like PublicSuffix("123.45.67.89")) == "89", false yielding EffectiveTLDPlusOne("123.45.67.89") == "67.89", nil which is nonsensical too.

But the problem here might be worth a error message.

@gopherbot
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Change https://golang.org/cl/172537 mentions this issue: publicsuffix: domain labels may not be empty

@golang golang locked and limited conversation to collaborators Apr 23, 2020
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