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Re: [PATCH 8/8] gpg-interface: handle alternative signature types

From
brian m. carlson <sandals@crustytoothpaste.net>
Date
Apr 14, 2018, 19:59 UTC
Message-ID
<20180414195954.GB14631@genre.crustytoothpaste.net>
In-Reply-To
<CAPig+cT3AobThgZ15iquyRQG0Qes1ZzQxycXcgHYuwQCuDEDBQ@mail.gmail.com>
On Tue, Apr 10, 2018 at 04:24:27AM -0400, Eric Sunshine wrote:
> How confident are we that _all_ possible signing programs will conform
> to the "-----BEGIN %s-----" pattern? If we're not confident, then
> perhaps the user should be providing the full string here, not just
> the '%s' part?

This is not likely to be true of other signing schemes. In fact, other than OpenPGP, PEM, and CMS (S/MIME), this is probably not true at all. I know OpenBSD's signify has no wrappers (except a mandatory "untrusted comment:" line at the beginning). There wouldn't be a way to match such a signature unless we implemented prefix or regex support.

It's currently possible to hack other signatures in with wrappers if they wrap the actual signature in OpenPGP-like armor; someone (I believe Eric Wong) has gotten this to work with signify. I only mention signify because other than OpenPGP and CMS, it's the only scheme I've seen people use with Git.

-- 
brian m. carlson: Houston, Texas, US
OpenPGP: https://keybase.io/bk2204
Previous: Ben ToewsNext: Junio C Hamano
Message 21 of 46 in “gpg-interface: Multiple signing tools”
  1. 0/8 gpg-interface: Multiple signing toolsBen Toews, Apr 9, 2018
  2. 1/8 gpg-interface: handle bool user.signingkeyBen Toews, Apr 9, 2018
  3. Eric SunshineApr 9, 2018
  4. Jeff KingApr 10, 2018
  5. 3/8 gpg-interface: use size_t for signature buffer sizeBen Toews, Apr 9, 2018
  6. 2/8 gpg-interface: modernize function declarationsBen Toews, Apr 9, 2018
  7. 4/8 gpg-interface: fix const-correctness of "eol" pointerBen Toews, Apr 9, 2018
  8. 5/8 gpg-interface: extract gpg line matching helperBen Toews, Apr 9, 2018
  9. 7/8 gpg-interface: prepare for parsing arbitrary PEM blocksBen Toews, Apr 9, 2018
  10. 6/8 gpg-interface: find the last gpg signature lineBen Toews, Apr 9, 2018
  11. Eric SunshineApr 9, 2018
  12. Junio C HamanoApr 10, 2018
  13. Ben ToewsApr 10, 2018
  14. Junio C HamanoApr 10, 2018
  15. Junio C HamanoApr 10, 2018
  16. Ben ToewsApr 11, 2018
  17. 8/8 gpg-interface: handle alternative signature typesBen Toews, Apr 9, 2018
  18. Stefan BellerApr 9, 2018
  19. Eric SunshineApr 10, 2018
  20. Ben ToewsApr 10, 2018
  21. brian m. carlsonApr 14, 2018
  22. Junio C HamanoApr 16, 2018
  23. brian m. carlsonApr 17, 2018
  24. Junio C HamanoApr 17, 2018
  25. Ben ToewsApr 17, 2018
  26. Taylor BlauApr 17, 2018
  27. Ben ToewsMay 3, 2018
  28. Jeff KingMay 7, 2018
  29. Junio C HamanoMay 7, 2018
  30. brian m. carlsonMay 7, 2018
  31. Jeff KingMay 8, 2018
  32. brian m. carlsonMay 8, 2018
  33. Jeff KingMay 9, 2018
  34. Junio C HamanoApr 10, 2018
  35. Ben ToewsApr 10, 2018
  36. SZEDER GáborApr 11, 2018
  37. 0/9 gpg-interface: Multiple signing toolsBen Toews, Apr 13, 2018
  38. 2/9 gpg-interface: handle bool user.signingkeyBen Toews, Apr 13, 2018
  39. 3/9 gpg-interface: modernize function declarationsBen Toews, Apr 13, 2018
  40. 1/9 t7004: fix mistaken tag nameBen Toews, Apr 13, 2018
  41. 8/9 gpg-interface: prepare for parsing arbitrary PEM blocksBen Toews, Apr 13, 2018
  42. 4/9 gpg-interface: use size_t for signature buffer sizeBen Toews, Apr 13, 2018
  43. 5/9 gpg-interface: fix const-correctness of "eol" pointerBen Toews, Apr 13, 2018
  44. 6/9 gpg-interface: extract gpg line matching helperBen Toews, Apr 13, 2018
  45. 7/9 gpg-interface: find the last gpg signature lineBen Toews, Apr 13, 2018
  46. 9/9 gpg-interface: handle alternative signature typesBen Toews, Apr 13, 2018

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