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net/http: invalid RAR sniff signature from the MIME Sniff spec #30926

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odeke-em opened this issue Mar 19, 2019 · 1 comment
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net/http: invalid RAR sniff signature from the MIME Sniff spec #30926

odeke-em opened this issue Mar 19, 2019 · 1 comment
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Go1.13

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odeke-em commented Mar 19, 2019 •
edited by cuonglm

I am coming here from CL https://go-review.googlesource.com/c/go/+/167781 created by @cuonglm's vigilance.

In particular it uses a wrong character for the 4th byte i.e.
0x20 " " for both RAR v5 and RAR v4 instead of 0x21 "!"

as per

go/src/net/http/sniff.go

Lines 188 to 189 in faa7fa0

&exactSig{[]byte("Rar \x1A\x07\x00"), "application/x-rar-compressed"}, // RAR v1.5-v4.0
&exactSig{[]byte("Rar \x1A\x07\x01\x00"), "application/x-rar-compressed"}, // RAR v5+

The sniff signature that we got from the MIME sniff spec is wrong and that's acknowledged at
whatwg/mimesniff#63
but also the official RAR Labs website shows the correct signature as
https://www.rarlab.com/technote.htm#rarsign
@odeke-em odeke-em added this to the Go1.13 milestone Mar 19, 2019
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Change https://golang.org/cl/167781 mentions this issue: net/http: fix wrong mime rar signature

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