Johannes Schindelin 8e94b65c00 http: fix emptyAuth=auto for Negotiate/SPNEGO (#6170)
When a server advertises Negotiate (SPNEGO) authentication alongside
Basic, the "auto" mode of http.emptyAuth should allow libcurl to
attempt Kerberos authentication using the system ticket cache before
falling back to credential_fill(). Currently this never happens due
to an interaction between two older features.

The Negotiate-stripping logic from 4dbe66464b (remote-curl: fall back
to Basic auth if Negotiate fails, 2015-01-08) removes
CURLAUTH_GSSNEGOTIATE on the first 401, before the auto-detection
from 40a18fc77c (http: add an "auto" mode for http.emptyauth,
2017-02-25) gets a chance to see it as an "exotic" method. The result
is that auto mode silently degrades to the same behavior as
emptyAuth=false for any server whose only non-Basic/Digest method is
Negotiate, forcing Kerberos users to manually set http.emptyAuth=true
to get seamless ticket-based authentication.

This series fixes the interaction by delaying the Negotiate stripping
in auto mode by one round-trip, giving empty auth a chance to use the
system Kerberos ticket. If there is no valid ticket, Negotiate is
stripped on the second 401 and we fall through to credential_fill()
as before. The true and false modes are unchanged.

  Patch 1: Extract a http_reauth_prepare() helper from the three
           retry paths that call credential_fill() on HTTP_REAUTH.
           Pure refactor, no behavior change.

  Patch 2: Delay the GSSNEGOTIATE stripping in auto mode and teach
           http_reauth_prepare() to skip credential_fill() when
           empty auth should be attempted first.

  Patch 3: Add tests verifying that auto mode produces an extra
           round-trip (empty auth attempt) compared to false mode,
           using the existing nph-custom-auth.sh CGI infrastructure.

There is a trade-off in auto mode: when a server advertises Negotiate
but the client has no valid Kerberos ticket, there is one extra
round-trip compared to the current behavior. This matches the
trade-off already documented in 40a18fc77c. Users who want to avoid
it can set http.emptyAuth=false.
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Git for Windows

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This is Git for Windows, the Windows port of Git.

The Git for Windows project is run using a governance model. If you encounter problems, you can report them as GitHub issues, discuss them in Git for Windows' Discussions or on the Git mailing list, and contribute bug fixes.

To build Git for Windows, please either install Git for Windows' SDK, start its git-bash.exe, cd to your Git worktree and run make, or open the Git worktree as a folder in Visual Studio.

To verify that your build works, use one of the following methods:

  • If you want to test the built executables within Git for Windows' SDK, prepend <worktree>/bin-wrappers to the PATH.

  • Alternatively, run make install in the Git worktree.

  • If you need to test this in a full installer, run sdk build git-and-installer.

  • You can also "install" Git into an existing portable Git via make install DESTDIR=<dir> where <dir> refers to the top-level directory of the portable Git. In this instance, you will want to prepend that portable Git's /cmd directory to the PATH, or test by running that portable Git's git-bash.exe or git-cmd.exe.

  • If you built using a recent Visual Studio, you can use the menu item Build>Install git (you will want to click on Project>CMake Settings for Git first, then click on Edit JSON and then point installRoot to the mingw64 directory of an already-unpacked portable Git).

    As in the previous bullet point, you will then prepend /cmd to the PATH or run using the portable Git's git-bash.exe or git-cmd.exe.

  • If you want to run the built executables in-place, but in a CMD instead of inside a Bash, you can run a snippet like this in the git-bash.exe window where Git was built (ensure that the EOF line has no leading spaces), and then paste into the CMD window what was put in the clipboard:

    clip.exe <<EOF
    set GIT_EXEC_PATH=$(cygpath -aw .)
    set PATH=$(cygpath -awp ".:contrib/scalar:/mingw64/bin:/usr/bin:$PATH")
    set GIT_TEMPLATE_DIR=$(cygpath -aw templates/blt)
    set GITPERLLIB=$(cygpath -aw perl/build/lib)
    EOF
    
  • If you want to run the built executables in-place, but outside of Git for Windows' SDK, and without an option to set/override any environment variables (e.g. in Visual Studio's debugger), you can call the Git executable by its absolute path and use the --exec-path option, like so:

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    Note: for this to work, you have to hard-link (or copy) the .dll files from the /mingw64/bin directory to the Git worktree, or add the /mingw64/bin directory to the PATH somehow or other.

To make sure that you are testing the correct binary, call ./git.exe version in the Git worktree, and then call git version in a directory/window where you want to test Git, and verify that they refer to the same version (you may even want to pass the command-line option --build-options to look at the exact commit from which the Git version was built).

Git - fast, scalable, distributed revision control system

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.adoc to get started, then see Documentation/giteveryday.adoc for a useful minimum set of commands, and Documentation/git-<commandname>.adoc for documentation of each command. If git has been correctly installed, then the tutorial can also be read with man gittutorial or git help tutorial, and the documentation of each command with man git-<commandname> or git help <commandname>.

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  • random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
  • stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
  • "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
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Description
A fork of Git containing Windows-specific patches.
Readme 404 MiB
2025-08-19 03:50:05 -05:00
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