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daemon: clarify directory arguments 

The undecorated arguments to the 'git-daemon' command provide a list of
directories. When at least one directory is specified, then 'git-daemon'
only serves requests that are within that directory list. The boolean
'--strict-paths' option makes the list more explicit in that
subdirectories are no longer included.

The existing documentation and error messages around this directory list
refer to it and its behavior as a "whitelist". The word "whitelist" has
cultural implications that are not inclusive.  Thankfully, it is not
difficult to reword and avoid its use. In the process, we can define the
purpose of this directory list directly.

In Documentation/git-daemon.txt, rewrite the OPTIONS section around the
'<directory>' option. Add additional clarity to the other options that
refer to these directories.

Some error messages can also be improved in daemon.c. The
'--strict-paths' option requires '<directory>' arguments, so refer to
that section of the documentation directly. A logerror() call points out
that a requested directory is not in the specified directory list. We
can use "list" here without any loss of information.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2022-07-19 18:32:13 +00:00 committed by Junio C Hamano
parent e4a4b31577
commit dee8a1455c
2 changed files with 15 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
Documentation/git-daemon.txt
View File

@ -32,8 +32,8 @@ that service if it is enabled.
It verifies that the directory has the magic file "git-daemon-export-ok", and
it will refuse to export any Git directory that hasn't explicitly been marked
for export this way (unless the `--export-all` parameter is specified). If you
pass some directory paths as 'git daemon' arguments, you can further restrict
the offers to a whitelist comprising of those.
pass some directory paths as 'git daemon' arguments, the offers are limited to
repositories within those directories.
By default, only `upload-pack` service is enabled, which serves
'git fetch-pack' and 'git ls-remote' clients, which are invoked
@ -50,7 +50,7 @@ OPTIONS
Match paths exactly (i.e. don't allow "/foo/repo" when the real path is
"/foo/repo.git" or "/foo/repo/.git") and don't do user-relative paths.
'git daemon' will refuse to start when this option is enabled and no
whitelist is specified.
directory arguments are provided.
--base-path=<path>::
Remap all the path requests as relative to the given path.
@ -73,7 +73,7 @@ OPTIONS
%IP for the server's IP address, %P for the port number,
and %D for the absolute path of the named repository.
After interpolation, the path is validated against the directory
whitelist.
list.
--export-all::
Allow pulling from all directories that look like Git repositories
@ -218,9 +218,11 @@ standard output to be sent to the requestor as an error message when
it declines the service.
<directory>::
A directory to add to the whitelist of allowed directories. Unless
--strict-paths is specified this will also include subdirectories
of each named directory.
The remaining arguments provide a list of directories. If any
directories are specified, then the `git-daemon` process will
serve a requested directory only if it is contained in one of
these directories. If `--strict-paths` is specified, then the
requested directory must match one of these directories exactly.
SERVICES
--------
@ -264,9 +266,8 @@ git 9418/tcp # Git Version Control System
'git daemon' as inetd server::
To set up 'git daemon' as an inetd service that handles any
repository under the whitelisted set of directories, /pub/foo
and /pub/bar, place an entry like the following into
/etc/inetd all on one line:
repository within `/pub/foo` or `/pub/bar`, place an entry like
the following into `/etc/inetd` all on one line:
+
------------------------------------------------
git stream tcp nowait nobody /usr/bin/git

8
daemon.c
View File

@ -279,7 +279,7 @@ static const char *path_ok(const char *directory, struct hostinfo *hi)
/* The validation is done on the paths after enter_repo
* appends optional {.git,.git/.git} and friends, but
* it does not use getcwd(). So if your /pub is
* a symlink to /mnt/pub, you can whitelist /pub and
* a symlink to /mnt/pub, you can include /pub and
* do not have to say /mnt/pub.
* Do not say /pub/.
*/
@ -298,7 +298,7 @@ static const char *path_ok(const char *directory, struct hostinfo *hi)
return path;
}
logerror("'%s': not in whitelist", path);
logerror("'%s': not in directory list", path);
return NULL; /* Fallthrough. Deny by default */
}
@ -403,7 +403,7 @@ static int run_service(const char *dir, struct daemon_service *service,
* a "git-daemon-export-ok" flag that says that the other side
* is ok with us doing this.
*
* path_ok() uses enter_repo() and does whitelist checking.
* path_ok() uses enter_repo() and checks for included directories.
* We only need to make sure the repository is exported.
*/
@ -1444,7 +1444,7 @@ int cmd_main(int argc, const char **argv)
cred = prepare_credentials(user_name, group_name);
if (strict_paths && (!ok_paths || !*ok_paths))
die("option --strict-paths requires a whitelist");
die("option --strict-paths requires '<directory>' arguments");
if (base_path && !is_directory(base_path))
die("base-path '%s' does not exist or is not a directory",