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From: M Hickford <mirth.hickford@gmail.com>
To: gitgitgadget@gmail.com
Cc: avarab@gmail.com, chooglen@google.com, derrickstolee@github.com,
	git@jeffhostetler.com, git@vger.kernel.org,
	lessleydennington@gmail.com, mirth.hickford@gmail.com,
	mjcheetham@outlook.com, vdye@github.com
Subject: [PATCH v7 00/12] Enhance credential helper protocol to include auth headers
Date: Sat, 28 Jan 2023 14:28:27 +0000	[thread overview]
Message-ID: <20230128142827.17397-1-mirth.hickford@gmail.com> (raw)
In-Reply-To: <pull.1352.v7.git.1674252530.gitgitgadget@gmail.com>

> Future work
> ===========
> 
> In the future we can further expand the protocol to allow credential helpers
> decide the best authentication scheme. Today credential helpers are still
> only expected to return a username/password pair to Git, meaning the other
> authentication schemes that may be offered still need challenge responses
> sent via a Basic Authorization header. The changes outlined above still
> permit helpers to select and configure an available authentication mode, but
> require the remote for example to unpack a bearer token from a basic
> challenge.
> 
> More careful consideration is required in the handling of custom
> authentication schemes which may not have a username, or may require
> arbitrary additional request header values be set.
> 
> For example imagine a new "FooBar" authentication scheme that is surfaced in
> the following response:
> 
> HTTP/1.1 401 Unauthorized
> WWW-Authenticate: FooBar realm="login.example", algs="ES256 PS256"
> 
> 
> With support for arbitrary authentication schemes, Git would call credential
> helpers with the following over standard input:
> 
> protocol=https
> host=example.com
> wwwauth[]=FooBar realm="login.example", algs="ES256 PS256", nonce="abc123"
> 
> 
> And then an enlightened credential helper could return over standard output:
> 
> protocol=https
> host=example.com
> authtype=FooBar
> username=bob@id.example.com
> password=<FooBar credential>
> header[]=X-FooBar: 12345
> header[]=X-FooBar-Alt: ABCDEF
> 
> 
> Git would be expected to attach this authorization header to the next
> request:
> 
> GET /info/refs?service=git-upload-pack HTTP/1.1
> Host: git.example
> Git-Protocol: version=2
> Authorization: FooBar <FooBar credential>
> X-FooBar: 12345
> X-FooBar-Alt: ABCDEF

Interesting! Can you tell us more about how you hope to use this at GitHub? Could this be used for OAuth 2.0 Demonstrating Proof-of-Possession at the Application Layer (DPoP)? https://datatracker.ietf.org/doc/html/draft-ietf-oauth-dpop (some of the fields in your example look familiar). 

Challenge responses are typically short lived [1]. What happens if a storage helper is configured before a challenge-response helper? We want to maintain composability of helpers.

[credential]
    helper = storage  # eg. cache or osxkeychain
    helper = challenge-response  # eg. oauth-dpop

Storage may return an expired challenge response stored earlier. This could be avoided by introducing an expiry attribute to the credential protocol. https://lore.kernel.org/git/pull.1443.git.git.1674914650588.gitgitgadget@gmail.com/T/#u

A monolithic helper configured alone doesn't have this problem -- it knows which parts of its output to store or discard.

Declaration of interest: I maintain a credential-generating OAuth helper composable with any storage helper. https://github.com/hickford/git-credential-oauth

[1] https://datatracker.ietf.org/doc/html/draft-ietf-oauth-dpop#section-8

  parent reply	other threads:[~2023-01-28 14:28 UTC|newest]

Thread overview: 223+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-13 19:25 [PATCH 0/8] [RFC] Enhance credential helper protocol to include auth headers Matthew John Cheetham via GitGitGadget
2022-09-13 19:25 ` [PATCH 1/8] wincred: ignore unknown lines (do not die) Matthew John Cheetham via GitGitGadget
2022-09-13 19:25 ` [PATCH 2/8] netrc: " Matthew John Cheetham via GitGitGadget
2022-09-13 19:25 ` [PATCH 3/8] osxkeychain: clarify that we ignore unknown lines Matthew John Cheetham via GitGitGadget
2022-09-19 16:12   ` Derrick Stolee
2022-09-21 22:48     ` Matthew John Cheetham
2022-09-13 19:25 ` [PATCH 4/8] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2022-09-19 16:21   ` Derrick Stolee
2022-09-21 22:24     ` Matthew John Cheetham
2022-09-26 14:13       ` Derrick Stolee
2022-09-13 19:25 ` [PATCH 5/8] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2022-09-19 16:33   ` Derrick Stolee
2022-09-21 22:20     ` Matthew John Cheetham
2022-09-13 19:25 ` [PATCH 6/8] http: store all request headers on active_request_slot Matthew John Cheetham via GitGitGadget
2022-09-13 19:25 ` [PATCH 7/8] http: move proactive auth to first slot creation Matthew John Cheetham via GitGitGadget
2022-09-13 19:25 ` [PATCH 8/8] http: set specific auth scheme depending on credential Matthew John Cheetham via GitGitGadget
2022-09-19 16:42   ` Derrick Stolee
2022-09-19 16:08 ` [PATCH 0/8] [RFC] Enhance credential helper protocol to include auth headers Derrick Stolee
2022-09-19 16:44   ` Derrick Stolee
2022-09-21 22:19   ` Matthew John Cheetham
2022-09-19 23:36 ` Lessley Dennington
2022-10-21 17:07 ` [PATCH v2 0/6] " Matthew John Cheetham via GitGitGadget
2022-10-21 17:07   ` [PATCH v2 1/6] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2022-10-21 17:07   ` [PATCH v2 2/6] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2022-10-28 18:22     ` Jeff Hostetler
2022-11-01 23:07       ` Matthew John Cheetham
2022-10-21 17:08   ` [PATCH v2 3/6] http: store all request headers on active_request_slot Matthew John Cheetham via GitGitGadget
2022-10-21 17:08   ` [PATCH v2 4/6] http: move proactive auth to first slot creation Matthew John Cheetham via GitGitGadget
2022-10-21 17:08   ` [PATCH v2 5/6] http: set specific auth scheme depending on credential Matthew John Cheetham via GitGitGadget
2022-10-21 17:08   ` [PATCH v2 6/6] t5556-http-auth: add test for HTTP auth hdr logic Matthew John Cheetham via GitGitGadget
2022-10-28 15:08     ` Derrick Stolee
2022-10-28 19:14       ` Jeff Hostetler
2022-11-01 23:14         ` Matthew John Cheetham
2022-11-02 14:38           ` Derrick Stolee
2022-11-01 23:59       ` Matthew John Cheetham
2022-10-25  2:26   ` git-credential.txt M Hickford
2022-10-25 20:49     ` git-credential.txt Matthew John Cheetham
2022-11-02 22:09   ` [PATCH v3 00/11] Enhance credential helper protocol to include auth headers Matthew John Cheetham via GitGitGadget
2022-11-02 22:09     ` [PATCH v3 01/11] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2022-11-02 22:09     ` [PATCH v3 02/11] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2022-11-02 22:09     ` [PATCH v3 03/11] http: store all request headers on active_request_slot Matthew John Cheetham via GitGitGadget
2022-11-09 23:18       ` Glen Choo
2022-11-02 22:09     ` [PATCH v3 04/11] http: move proactive auth to first slot creation Matthew John Cheetham via GitGitGadget
2022-11-02 22:09     ` [PATCH v3 05/11] http: set specific auth scheme depending on credential Matthew John Cheetham via GitGitGadget
2022-11-09 23:40       ` Glen Choo
2022-12-12 21:53         ` Matthew John Cheetham
2022-11-02 22:09     ` [PATCH v3 06/11] test-http-server: add stub HTTP server test helper Matthew John Cheetham via GitGitGadget
2022-11-07 19:19       ` Derrick Stolee
2022-11-02 22:09     ` [PATCH v3 07/11] test-http-server: add HTTP error response function Matthew John Cheetham via GitGitGadget
2022-11-02 22:09     ` [PATCH v3 08/11] test-http-server: add HTTP request parsing Matthew John Cheetham via GitGitGadget
2022-11-02 22:09     ` [PATCH v3 09/11] test-http-server: pass Git requests to http-backend Matthew John Cheetham via GitGitGadget
2022-11-02 22:09     ` [PATCH v3 10/11] test-http-server: add simple authentication Matthew John Cheetham via GitGitGadget
2022-11-02 22:09     ` [PATCH v3 11/11] t5556: add HTTP authentication tests Matthew John Cheetham via GitGitGadget
2022-11-03 19:00     ` [PATCH v3 00/11] Enhance credential helper protocol to include auth headers M Hickford
2022-12-12 22:07       ` Matthew John Cheetham
2022-11-07 19:23     ` Derrick Stolee
2022-11-09 23:06     ` Glen Choo
2022-12-12 22:03       ` Matthew John Cheetham
2022-11-28  9:40     ` Junio C Hamano
2022-12-12 21:36     ` [PATCH v4 0/8] " Matthew John Cheetham via GitGitGadget
2022-12-12 21:36       ` [PATCH v4 1/8] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2022-12-14 23:15         ` Victoria Dye
2023-01-11 22:09           ` Matthew John Cheetham
2022-12-15  9:27         ` Ævar Arnfjörð Bjarmason
2023-01-11 22:11           ` Matthew John Cheetham
2022-12-12 21:36       ` [PATCH v4 2/8] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2022-12-14 23:15         ` Victoria Dye
2023-01-11 20:37           ` Matthew John Cheetham
2022-12-12 21:36       ` [PATCH v4 3/8] test-http-server: add stub HTTP server test helper Matthew John Cheetham via GitGitGadget
2022-12-14 23:16         ` Victoria Dye
2023-01-11 20:46           ` Matthew John Cheetham
2022-12-12 21:36       ` [PATCH v4 4/8] test-http-server: add HTTP error response function Matthew John Cheetham via GitGitGadget
2022-12-14 23:17         ` Victoria Dye
2022-12-12 21:36       ` [PATCH v4 5/8] test-http-server: add HTTP request parsing Matthew John Cheetham via GitGitGadget
2022-12-14 23:18         ` Victoria Dye
2023-01-11 21:39           ` Matthew John Cheetham
2022-12-12 21:36       ` [PATCH v4 6/8] test-http-server: pass Git requests to http-backend Matthew John Cheetham via GitGitGadget
2022-12-14 23:20         ` Victoria Dye
2023-01-11 21:45           ` Matthew John Cheetham
2023-01-12 20:54             ` Victoria Dye
2022-12-12 21:36       ` [PATCH v4 7/8] test-http-server: add simple authentication Matthew John Cheetham via GitGitGadget
2022-12-14 23:23         ` Victoria Dye
2023-01-11 22:00           ` Matthew John Cheetham
2022-12-12 21:36       ` [PATCH v4 8/8] t5556: add HTTP authentication tests Matthew John Cheetham via GitGitGadget
2022-12-14 23:48         ` Victoria Dye
2022-12-15  0:21           ` Junio C Hamano
2023-01-11 22:05             ` Matthew John Cheetham
2023-01-11 22:04           ` Matthew John Cheetham
2023-01-11 22:13       ` [PATCH v5 00/10] Enhance credential helper protocol to include auth headers Matthew John Cheetham via GitGitGadget
2023-01-11 22:13         ` [PATCH v5 01/10] daemon: libify socket setup and option functions Matthew John Cheetham via GitGitGadget
2023-01-12 19:35           ` Victoria Dye
2023-01-12 20:22             ` Derrick Stolee
2023-01-11 22:13         ` [PATCH v5 02/10] daemon: libify child process handling functions Matthew John Cheetham via GitGitGadget
2023-01-12 19:35           ` Victoria Dye
2023-01-17 21:14             ` Matthew John Cheetham
2023-01-11 22:13         ` [PATCH v5 03/10] daemon: rename some esoteric/laboured terminology Matthew John Cheetham via GitGitGadget
2023-01-12 19:44           ` Victoria Dye
2023-01-17 21:16             ` Matthew John Cheetham
2023-01-11 22:13         ` [PATCH v5 04/10] test-http-server: add stub HTTP server test helper Matthew John Cheetham via GitGitGadget
2023-01-12 19:57           ` Victoria Dye
2023-01-11 22:13         ` [PATCH v5 05/10] test-http-server: add HTTP error response function Matthew John Cheetham via GitGitGadget
2023-01-12 20:35           ` Victoria Dye
2023-01-17 21:23             ` Matthew John Cheetham
2023-01-11 22:13         ` [PATCH v5 06/10] test-http-server: add simple authentication Matthew John Cheetham via GitGitGadget
2023-01-13 18:10           ` Victoria Dye
2023-01-13 21:06             ` Junio C Hamano
2023-01-17 21:21             ` Matthew John Cheetham
2023-01-11 22:13         ` [PATCH v5 07/10] http: replace unsafe size_t multiplication with st_mult Matthew John Cheetham via GitGitGadget
2023-01-11 22:13         ` [PATCH v5 08/10] strvec: expose strvec_push_nodup for external use Matthew John Cheetham via GitGitGadget
2023-01-11 22:13         ` [PATCH v5 09/10] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2023-01-12  8:41           ` Ævar Arnfjörð Bjarmason
2023-01-17 21:51             ` Matthew John Cheetham
2023-01-11 22:13         ` [PATCH v5 10/10] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2023-01-12  8:48           ` Ævar Arnfjörð Bjarmason
2023-01-17 21:35             ` Matthew John Cheetham
2023-01-12 20:41           ` Derrick Stolee
2023-01-17 21:18             ` Matthew John Cheetham
2023-01-18  3:30         ` [PATCH v6 00/12] Enhance credential helper protocol to include auth headers Matthew John Cheetham via GitGitGadget
2023-01-18  3:30           ` [PATCH v6 01/12] daemon: libify socket setup and option functions Matthew John Cheetham via GitGitGadget
2023-01-18  3:30           ` [PATCH v6 02/12] daemon: libify child process handling functions Matthew John Cheetham via GitGitGadget
2023-01-18  3:30           ` [PATCH v6 03/12] daemon: rename some esoteric/laboured terminology Matthew John Cheetham via GitGitGadget
2023-01-18  3:30           ` [PATCH v6 04/12] test-http-server: add stub HTTP server test helper Matthew John Cheetham via GitGitGadget
2023-01-18 11:04             ` Ævar Arnfjörð Bjarmason
2023-01-20 22:05               ` Matthew John Cheetham
2023-01-18  3:30           ` [PATCH v6 05/12] test-http-server: add HTTP error response function Matthew John Cheetham via GitGitGadget
2023-01-18 11:07             ` Ævar Arnfjörð Bjarmason
2023-01-20 22:05               ` Matthew John Cheetham
2023-01-18  3:30           ` [PATCH v6 06/12] test-http-server: add HTTP request parsing Matthew John Cheetham via GitGitGadget
2023-01-18 11:14             ` Ævar Arnfjörð Bjarmason
2023-01-20 22:05               ` Matthew John Cheetham
2023-01-18  3:30           ` [PATCH v6 07/12] test-http-server: pass Git requests to http-backend Matthew John Cheetham via GitGitGadget
2023-01-18  3:30           ` [PATCH v6 08/12] test-http-server: add simple authentication Matthew John Cheetham via GitGitGadget
2023-01-18 11:21             ` Ævar Arnfjörð Bjarmason
2023-01-20 22:05               ` Matthew John Cheetham
2023-01-18  3:30           ` [PATCH v6 09/12] test-http-server: add sending of arbitrary headers Matthew John Cheetham via GitGitGadget
2023-01-18  3:30           ` [PATCH v6 10/12] http: replace unsafe size_t multiplication with st_mult Matthew John Cheetham via GitGitGadget
2023-01-18 11:38             ` Ævar Arnfjörð Bjarmason
2023-01-18 17:28               ` Victoria Dye
2023-01-18 23:16                 ` Ævar Arnfjörð Bjarmason
2023-01-18  3:30           ` [PATCH v6 11/12] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2023-01-18 11:42             ` Ævar Arnfjörð Bjarmason
2023-01-20 22:05               ` Matthew John Cheetham
2023-01-18  3:30           ` [PATCH v6 12/12] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2023-01-20 22:08           ` [PATCH v7 00/12] Enhance credential helper protocol to include auth headers Matthew John Cheetham via GitGitGadget
2023-01-20 22:08             ` [PATCH v7 01/12] daemon: libify socket setup and option functions Matthew John Cheetham via GitGitGadget
2023-01-20 22:08             ` [PATCH v7 02/12] daemon: libify child process handling functions Matthew John Cheetham via GitGitGadget
2023-01-20 22:08             ` [PATCH v7 03/12] daemon: rename some esoteric/laboured terminology Matthew John Cheetham via GitGitGadget
2023-01-20 22:08             ` [PATCH v7 04/12] test-http-server: add stub HTTP server test helper Matthew John Cheetham via GitGitGadget
2023-01-26  8:58               ` Jeff King
2023-01-20 22:08             ` [PATCH v7 05/12] test-http-server: add HTTP error response function Matthew John Cheetham via GitGitGadget
2023-01-20 22:08             ` [PATCH v7 06/12] test-http-server: add HTTP request parsing Matthew John Cheetham via GitGitGadget
2023-01-26  9:30               ` Jeff King
2023-01-20 22:08             ` [PATCH v7 07/12] test-http-server: pass Git requests to http-backend Matthew John Cheetham via GitGitGadget
2023-01-26  9:37               ` Jeff King
2023-01-20 22:08             ` [PATCH v7 08/12] test-http-server: add simple authentication Matthew John Cheetham via GitGitGadget
2023-01-26 10:02               ` Jeff King
2023-01-26 21:22                 ` Jeff King
2023-01-26 22:27                   ` Junio C Hamano
2023-01-26 20:33               ` Jeff King
2023-01-20 22:08             ` [PATCH v7 09/12] test-http-server: add sending of arbitrary headers Matthew John Cheetham via GitGitGadget
2023-01-20 22:08             ` [PATCH v7 10/12] http: replace unsafe size_t multiplication with st_mult Matthew John Cheetham via GitGitGadget
2023-01-26 10:09               ` Jeff King
2023-01-20 22:08             ` [PATCH v7 11/12] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2023-01-26 10:31               ` Jeff King
2023-02-06 19:25                 ` Matthew John Cheetham
2023-02-09 13:12                   ` Jeff King
2023-01-20 22:08             ` [PATCH v7 12/12] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2023-01-26 11:25               ` Jeff King
2023-02-06 19:18                 ` Matthew John Cheetham
2023-02-09 13:08                   ` Jeff King
2023-01-24 17:30             ` [PATCH v7 00/12] Enhance credential helper protocol to include auth headers Victoria Dye
2023-01-24 18:03               ` Junio C Hamano
2023-01-26 11:29                 ` Jeff King
2023-01-26 16:05                   ` Junio C Hamano
2023-02-02 10:14                     ` Johannes Schindelin
2023-02-02 11:04                       ` Ævar Arnfjörð Bjarmason
2023-02-02 13:51                         ` Johannes Schindelin
2023-02-06 21:32                           ` Ævar Arnfjörð Bjarmason
2023-03-27  9:05                             ` Johannes Schindelin
2023-02-03 17:34                       ` Jeff King
2023-03-27  9:10                         ` Johannes Schindelin
2023-03-28 18:55                           ` Jeff King
2023-01-28 14:28             ` M Hickford [this message]
2023-02-01 20:15               ` Matthew John Cheetham
2023-02-02  0:16                 ` Jeff King
2023-02-06 19:29             ` [PATCH v8 0/3] " Matthew John Cheetham via GitGitGadget
2023-02-06 19:29               ` [PATCH v8 1/3] t5563: add tests for basic and anoymous HTTP access Matthew John Cheetham via GitGitGadget
2023-02-06 20:32                 ` Ævar Arnfjörð Bjarmason
2023-02-08 20:24                 ` Victoria Dye
2023-02-09 11:19                   ` Ævar Arnfjörð Bjarmason
2023-02-15 19:32                     ` Matthew John Cheetham
2023-02-06 19:29               ` [PATCH v8 2/3] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2023-02-06 20:36                 ` Ævar Arnfjörð Bjarmason
2023-02-08 21:05                 ` Victoria Dye
2023-02-06 19:29               ` [PATCH v8 3/3] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2023-02-06 20:45                 ` Ævar Arnfjörð Bjarmason
2023-02-15 19:19                   ` Matthew John Cheetham
2023-02-06 20:59               ` [PATCH v8 0/3] Enhance credential helper protocol to include auth headers Ævar Arnfjörð Bjarmason
2023-02-08 21:29               ` Victoria Dye
2023-02-08 21:54               ` Junio C Hamano
2023-02-15 21:34               ` [PATCH v9 " Matthew John Cheetham via GitGitGadget
2023-02-15 21:34                 ` [PATCH v9 1/3] t5563: add tests for basic and anoymous HTTP access Matthew John Cheetham via GitGitGadget
2023-02-15 22:15                   ` Junio C Hamano
2023-02-16 22:25                     ` Matthew John Cheetham
2023-02-15 21:34                 ` [PATCH v9 2/3] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2023-02-15 23:26                   ` Junio C Hamano
2023-02-16 22:29                     ` Matthew John Cheetham
2023-02-15 21:34                 ` [PATCH v9 3/3] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2023-02-16 22:34                 ` [PATCH v10 0/3] Enhance credential helper protocol to include auth headers Matthew John Cheetham via GitGitGadget
2023-02-16 22:34                   ` [PATCH v10 1/3] t5563: add tests for basic and anoymous HTTP access Matthew John Cheetham via GitGitGadget
2023-02-23  9:16                     ` Jeff King
2023-02-23  9:37                       ` Jeff King
2023-02-27 17:18                       ` Matthew John Cheetham
2023-02-16 22:34                   ` [PATCH v10 2/3] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2023-02-23  9:46                     ` Jeff King
2023-02-23 19:49                       ` Junio C Hamano
2023-02-27 17:14                         ` Matthew John Cheetham
2023-02-16 22:34                   ` [PATCH v10 3/3] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2023-02-27 17:20                   ` [PATCH v11 0/3] Enhance credential helper protocol to include auth headers Matthew John Cheetham via GitGitGadget
2023-02-27 17:20                     ` [PATCH v11 1/3] t5563: add tests for basic and anoymous HTTP access Matthew John Cheetham via GitGitGadget
2023-02-27 17:20                     ` [PATCH v11 2/3] http: read HTTP WWW-Authenticate response headers Matthew John Cheetham via GitGitGadget
2023-02-27 17:20                     ` [PATCH v11 3/3] credential: add WWW-Authenticate header to cred requests Matthew John Cheetham via GitGitGadget
2023-02-27 20:27                     ` [PATCH v11 0/3] Enhance credential helper protocol to include auth headers Jeff King

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