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x/crypto/argon2: panic if keyLen == 0 #33583

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guidovranken opened this issue Aug 11, 2019 · 2 comments · May be fixed by golang/crypto#95
Open

x/crypto/argon2: panic if keyLen == 0 #33583

guidovranken opened this issue Aug 11, 2019 · 2 comments · May be fixed by golang/crypto#95
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help wanted NeedsFix The path to resolution is known, but the work has not been done.
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Unreleased

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

Does this issue reproduce with the latest release?

Assuming Playground uses the latest Go version, yes.

What operating system and processor architecture are you using (go env)?

What did you do?

https://play.golang.org/p/k07nWDYZ7Zk

What did you expect to see?

Should return empty byte slice

What did you see instead?

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0xffffffff addr=0x0 pc=0xab662]

goroutine 1 [running]:
golang.org/x/crypto/blake2b.(*digest).Write(0x0, 0x432240, 0x4, 0x40, 0x0, 0xf0520, 0x40c080, 0xce380)
	/tmp/gopath522840708/pkg/mod/golang.org/x/[email protected]/blake2b/blake2b.go:216 +0x22
golang.org/x/crypto/argon2.blake2bHash(0x15ee7c, 0x0, 0x0, 0x44e400, 0x400, 0x400)
	/tmp/gopath522840708/pkg/mod/golang.org/x/[email protected]/argon2/blake2b.go:26 +0xc0
golang.org/x/crypto/argon2.extractKey(0x800000, 0x10000, 0x10000, 0x10000, 0x4, 0x0, 0x1, 0x0, 0x0, 0x0)
	/tmp/gopath522840708/pkg/mod/golang.org/x/[email protected]/argon2/argon2.go:255 +0x2c0
golang.org/x/crypto/argon2.deriveKey(0x1, 0x414008, 0x1, 0x1, 0x414009, 0x1, 0x1, 0x0, 0x0, 0x0, ...)
	/tmp/gopath522840708/pkg/mod/golang.org/x/[email protected]/argon2/argon2.go:117 +0x2e0
golang.org/x/crypto/argon2.Key(...)
	/tmp/gopath522840708/pkg/mod/golang.org/x/[email protected]/argon2/argon2.go:75
main.main()
	/tmp/sandbox040143225/prog.go:9 +0x100
@FiloSottile FiloSottile changed the title golang.org/x/crypto/argon2 SIGSEGV if keyLen == 0 x/crypto/argon2: panic if keyLen == 0 Aug 11, 2019
@gopherbot gopherbot added this to the Unreleased milestone Aug 11, 2019
@FiloSottile FiloSottile added help wanted NeedsFix The path to resolution is known, but the work has not been done. labels Aug 11, 2019
@psampaz psampaz linked a pull request Aug 11, 2019 that will close this issue
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@gopherbot
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Change https://golang.org/cl/189878 mentions this issue: x/crypto/argon2: fix panic when keyLen == 0

@smasher164
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I may have misread the spec, but doesn't argon2 expect a minimum keyLen of 4?
https://tools.ietf.org/html/draft-irtf-cfrg-argon2-03#section-3.1

In that case, how about intentionally panicking on a keyLen < 4? Something like,

if keyLen < 4 {
	panic("argon2: tag length is too small")
}

If it's any indication, the panic is currently happening because blake2b expects a hash size of at least 1, so maybe we should error out instead.

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x/crypto/argon2: fix panic when calling IDKey or Key with keyLen == 0 psampaz/crypto
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@FiloSottile @guidovranken @gopherbot @smasher164