[tor-bugs] #18938 [Core Tor/Tor]: Authorities should reject non-ASCII content in ExtraInfo descriptors

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#18938: Authorities should reject non-ASCII content in ExtraInfo descriptors
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 Reporter:  teor                                |          Owner:
     Type:  defect                              |         Status:  new
 Priority:  Medium                              |      Milestone:  Tor:
Component:  Core Tor/Tor                        |  0.2.???
 Severity:  Normal                              |        Version:
 Keywords:  029-proposed, needs-proposal-maybe  |     Resolution:
Parent ID:  #18656                              |  Actual Points:
 Reviewer:                                      |         Points:  small
                                                |        Sponsor:
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Changes (by teor):

 * keywords:  029-proposed => 029-proposed, needs-proposal-maybe


Comment:

 Migrating the consensus version with this change could be interesting, I
 suggest we do the following:
 * if, at vote time, the current consensus version is >=
 MIN_VERSION_TO_EXCLUDE_NON_ASCII_DIR_DOCS, authorities exclude relays with
 descriptors containing non-ascii characters from their votes
 * to avoid a consensus split, authorities always accept uploaded
 descriptors, containing non-ascii characters, if they are uploaded from
 other authorities
 * authorities with this bugfix reject all uploaded documents, including
 descriptors and extra-info, containing non-ascii characters
   * this gives relay operators ample warning to modify their contact lines
 * relays also do this validation before upload

 Separately, perhaps in conjunction with prop224:
 * hidden service directories validate and reject (encrypted) hidden
 service descriptors containing non-ascii characters
 * clients validate and reject (decrypted) hidden service descriptors
 containing non-ascii characters
 * hidden services also do this validation before upload

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18938#comment:3>
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