[tbb-bugs] #20892 [Applications/Tor Browser]: tools/update-responses/download_missing_versions fails to download OSX mar files

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#20892: tools/update-responses/download_missing_versions fails to download OSX mar
files
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 Reporter:  boklm                     |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  TorBrowserTeam201702      |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by boklm):

 `signmar` has an option for verifying the signature of a mar file that we
 could use:
 {{{
 Verify a MAR file:
   mar [-C workingDir] -d NSSConfigDir -n certname -v signed_archive.mar
 At most 8 signature certificate names are specified by -n0 certName -n1
 certName2, ...
 At most 8 verification certificate names are specified by -n0 certName -n1
 certName2, ...
 }}}

 However I don't know if we can easily access the certificate files from
 the `tools/update-responses/download_missing_versions` script.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20892#comment:5>
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