Re: [openpgp] Possible ambiguity in description of regular expressions: [^][]
Ángel <angel@16bits.net> Fri, 08 January 2021 01:42 UTC
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From: Ángel <angel@16bits.net>
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Date: Fri, 08 Jan 2021 02:42:36 +0100
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References: <87r1nguquq.wl-neal@walfield.org> <87tusbuwzp.fsf@fifthhorseman.net> <87mtxzv7mr.wl-neal@walfield.org> <877dor8kl1.fsf@fifthhorseman.net> <87456fad-06cd-6605-b5d1-ea5ac49c9ee4@andrewg.com> <a061d617a22416638bf1fb0a1f7d66b7495f9b82.camel@16bits.net>
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Subject: Re: [openpgp] Possible ambiguity in description of regular expressions: [^][]
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On 2021-01-08 at 01:29 +0100, Ángel wrote: > It is unlikely that someone would have restricted a trust value based > on the presence of curly brackets on an User ID (they are legal in > the local part of email addresses, even unquoted, but it would be > very rare to find one). I have done a small review on the keyservers for User ID containing curly brackets. First, I restricted it to User ID containing email addresses.† Most curly brackets on user id appear on the display-name of the user-id, as part of a nick or used as brackets (e.g. "{Corporate Key}", "{RSA Key}"…). Someone might want to restrict a signature based on the display name, such as trusting "John Doe" key for signing any key of someone named "John Doe" (presumably other keys of himself), thus breaking for names/nicks restricted in such way that contained "{". But the real benefit of this feature imho would be for delegating the trust on a subset of users, based on their email address. For example, trust on a protonmail "master" openpgp key could (should?) be qualified for "@protonmail\.(com|ch)>$" to only cover their users. This reduces a lot the number of user ids with curly braces. There are a few people that surrounded the email address with curly braces instead of angle ones, or added a name/comment with those. Such emails wouldn't be recognised by mail clients, though. There are three instances where curlies appear on the domain part, in order to cover multiple domains: <{chongo,noll}@{toad,sgi}.com> <dz@{pd.dialnet,rd.relcom}.msk.su> <colinp@{jolt.mpx,nms.otc}.com.au> And then exactly twelve email addresses with the character '{' in the local part: <{R}@semolina.org>³ <{^_^}@hafner.NL.EU.ORG>¹ <{pc}@vlaad.co.uk>² <{richard}@the-gog.org>⁵ <tao{tones@ivwnet.com>⁶ <{ajh}@andrewhill.com>⁷ <{richard}@demeseo.com>⁴ <c}{s@moyind.dhs.org>² <lunam2{dhwtowers/towers2/lunam2}@dhw.state.id.us>³ <odal14{@gmx.net>⁸ <alise{TW}@computer-netsolutions.com>⁵ <c}{s@moyind.com>² Of which only one of them works. † This basically lets us ignore "bad" user IDs such as html pages. I also filtered out from the analysis some garbage-looking user ids. ¹ E-mail accepted ² NXDOMAIN ³ No MX/A record ⁴ No MX record and no SMTP server reachable on A record ⁵ Recipient address rejected: User unknown in virtual mailbox table ⁶ 550 User unknown. (#5.1.1) ⁷ 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) ⁸ 550 Requested action not taken: mailbox unavailable
- [openpgp] Possible ambiguity in description of re… Neal H. Walfield
- Re: [openpgp] Possible ambiguity in description o… Daniel Kahn Gillmor
- Re: [openpgp] Possible ambiguity in description o… Neal H. Walfield
- Re: [openpgp] Possible ambiguity in description o… Daniel Kahn Gillmor
- Re: [openpgp] Possible ambiguity in description o… Andrew Gallagher
- Re: [openpgp] Possible ambiguity in description o… Ángel
- Re: [openpgp] Possible ambiguity in description o… Ángel
- Re: [openpgp] Possible ambiguity in description o… Andrew Gallagher
- Re: [openpgp] Possible ambiguity in description o… Ángel
- Re: [openpgp] Possible ambiguity in description o… Daniel Kahn Gillmor
- Re: [openpgp] Possible ambiguity in description o… Ángel
- Re: [openpgp] Possible ambiguity in description o… Daniel Kahn Gillmor
- Re: [openpgp] Possible ambiguity in description o… Ángel
- Re: [openpgp] Possible ambiguity in description o… Wiktor Kwapisiewicz