File handle-credential-partial-url-key.patch of Package git.37098

From 12294990c90e043862be9eb7eb22c3784b526340 Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Fri, 24 Apr 2020 22:35:49 +0000
Subject: [PATCH] credential: handle `credential.<partial-URL>.<key>` again

In the patches for CVE-2020-11008, the ability to specify credential
settings in the config for partial URLs got lost. For example, it used
to be possible to specify a credential helper for a specific protocol:

	[credential "https://"]
		helper = my-https-helper

Likewise, it used to be possible to configure settings for a specific
host, e.g.:

	[credential "dev.azure.com"]
		useHTTPPath = true

Let's reinstate this behavior.

While at it, increase the test coverage to document and verify the
behavior with a couple other categories of partial URLs.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 credential.c           | 27 +++++++++++++++++++++++++++
 t/t0300-credentials.sh | 38 ++++++++++++++++++++++++++++++++++++++
 urlmatch.c             | 10 +++++++---
 urlmatch.h             |  5 +++++
 4 files changed, 77 insertions(+), 3 deletions(-)

diff --git a/credential.c b/credential.c
index b8f693fa28821d..4e7197d97a96d2 100644
--- a/credential.c
+++ b/credential.c
@@ -37,6 +37,10 @@ int credential_match(const struct credential *want,
 #undef CHECK
 }
 
+
+static int credential_from_potentially_partial_url(struct credential *c,
+						   const char *url);
+
 static int credential_config_callback(const char *var, const char *value,
 				      void *data)
 {
@@ -82,6 +86,22 @@ static int select_all(const struct urlmatch_item *a,
 	return 0;
 }
 
+static int match_partial_url(const char *url, void *cb)
+{
+	struct credential *c = cb;
+	struct credential want = CREDENTIAL_INIT;
+	int matches = 0;
+
+	if (credential_from_potentially_partial_url(&want, url) < 0)
+		warning(_("skipping credential lookup for key: credential.%s"),
+			url);
+	else
+		matches = credential_match(&want, c);
+	credential_clear(&want);
+
+	return matches;
+}
+
 static void credential_apply_config(struct credential *c)
 {
 	char *normalized_url;
@@ -101,6 +121,7 @@ static void credential_apply_config(struct credential *c)
 	config.collect_fn = credential_config_callback;
 	config.cascade_fn = NULL;
 	config.select_fn = select_all;
+	config.fallback_match_fn = match_partial_url;
 	config.cb = c;
 
 	credential_format(c, &url);
@@ -468,6 +489,12 @@ static int credential_from_url_1(struct credential *c, const char *url,
 	return 0;
 }
 
+static int credential_from_potentially_partial_url(struct credential *c,
+						   const char *url)
+{
+	return credential_from_url_1(c, url, 1, 0);
+}
+
 int credential_from_url_gently(struct credential *c, const char *url, int quiet)
 {
 	return credential_from_url_1(c, url, 0, quiet);
diff --git a/urlmatch.c b/urlmatch.c
index 29272a5c4f4d4a..33a2ccd306b6a7 100644
--- a/urlmatch.c
+++ b/urlmatch.c
@@ -572,10 +572,14 @@ int urlmatch_config_entry(const char *var, const char *value, void *cb)
 
 		config_url = xmemdupz(key, dot - key);
 		norm_url = url_normalize_1(config_url, &norm_info, 1);
+		if (norm_url)
+			retval = match_urls(url, &norm_info, &matched);
+		else if (collect->fallback_match_fn)
+			retval = collect->fallback_match_fn(config_url,
+							    collect->cb);
+		else
+			retval = 0;
 		free(config_url);
-		if (!norm_url)
-			return 0;
-		retval = match_urls(url, &norm_info, &matched);
 		free(norm_url);
 		if (!retval)
 			return 0;
diff --git a/urlmatch.h b/urlmatch.h
index 2407520731f9f0..6ff42f81b0c1e0 100644
--- a/urlmatch.h
+++ b/urlmatch.h
@@ -59,6 +59,11 @@ struct urlmatch_config {
 	 * specificity rules) than existing.
 	 */
 	int (*select_fn)(const struct urlmatch_item *found, const struct urlmatch_item *existing);
+	/*
+	 * An optional callback to allow e.g. for partial URLs; it shall
+	 * return 1 or 0 depending whether `url` matches or not.
+	 */
+	int (*fallback_match_fn)(const char *url, void *cb);
 };
 
 int urlmatch_config_entry(const char *var, const char *value, void *cb);