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[PATCHv2 06/13] credential: apply helper config

From
Jeff King <peff@peff.net>
Date
Dec 6, 2011, 06:22 UTC
Message-ID
<20111206062247.GF29233@sigill.intra.peff.net>
In-Reply-To
<20111206062127.GA29046@sigill.intra.peff.net>

The functionality for credential storage helpers is already there; we just need to give the users a way to turn it on. This patch provides a "credential.helper" configuration variable which allows the user to provide one or more helper strings.

Rather than simply matching credential.helper, we will also compare URLs in subsection headings to the current context. This means you can apply configuration to a subset of credentials. For example:

  [credential "https://example.com"]
	helper = foo

would match a request for "https://example.com/foo.git", but not one for "https://kernel.org/foo.git".

This is overkill for the "helper" variable, since users are unlikely to want different helpers for different sites (and since helpers run arbitrary code, they could do the matching themselves anyway).

However, future patches will add new config variables where this extra feature will be more useful.

Signed-off-by: Jeff King <peff@peff.net>
---
 credential.c           |   61 ++++++++++++++++++++++++++++++++++++++++++++++++
 credential.h           |    5 +++-
 t/t0300-credentials.sh |   42 +++++++++++++++++++++++++++++++++
 t/t5550-http-fetch.sh  |   12 +++++++++
 4 files changed, 119 insertions(+), 1 deletions(-)
diff --git a/credential.c b/credential.c
index c349b9a..96be1c2 100644
--- a/credential.c
+++ b/credential.c
@@ -22,6 +22,61 @@ void credential_clear(struct credential *c)
 	credential_init(c);
 }
 
+int credential_match(const struct credential *want,
+		     const struct credential *have)
+{
+#define CHECK(x) (!want->x || (have->x && !strcmp(want->x, have->x)))
+	return CHECK(protocol) &&
+	       CHECK(host) &&
+	       CHECK(path) &&
+	       CHECK(username);
+#undef CHECK
+}
+
+static int credential_config_callback(const char *var, const char *value,
+				      void *data)
+{
+	struct credential *c = data;
+	const char *key, *dot;
+
+	key = skip_prefix(var, "credential.");
+	if (!key)
+		return 0;
+
+	if (!value)
+		return config_error_nonbool(var);
+
+	dot = strrchr(key, '.');
+	if (dot) {
+		struct credential want = CREDENTIAL_INIT;
+		char *url = xmemdupz(key, dot - key);
+		int matched;
+
+		credential_from_url(&want, url);
+		matched = credential_match(&want, c);
+
+		credential_clear(&want);
+		free(url);
+
+		if (!matched)
+			return 0;
+		key = dot + 1;
+	}
+
+	if (!strcmp(key, "helper"))
+		string_list_append(&c->helpers, value);
+
+	return 0;
+}
+
+static void credential_apply_config(struct credential *c)
+{
+	if (c->configured)
+		return;
+	git_config(credential_config_callback, c);
+	c->configured = 1;
+}
+
 static void credential_describe(struct credential *c, struct strbuf *out)
 {
 	if (!c->protocol)
@@ -195,6 +250,8 @@ void credential_fill(struct credential *c)
 	if (c->username && c->password)
 		return;
 
+	credential_apply_config(c);
+
 	for (i = 0; i < c->helpers.nr; i++) {
 		credential_do(c, c->helpers.items[i].string, "get");
 		if (c->username && c->password)
@@ -215,6 +272,8 @@ void credential_approve(struct credential *c)
 	if (!c->username || !c->password)
 		return;
 
+	credential_apply_config(c);
+
 	for (i = 0; i < c->helpers.nr; i++)
 		credential_do(c, c->helpers.items[i].string, "store");
 	c->approved = 1;
@@ -224,6 +283,8 @@ void credential_reject(struct credential *c)
 {
 	int i;
 
+	credential_apply_config(c);
+
 	for (i = 0; i < c->helpers.nr; i++)
 		credential_do(c, c->helpers.items[i].string, "erase");
 
diff --git a/credential.h b/credential.h
index 8a6d162..e504272 100644
--- a/credential.h
+++ b/credential.h
@@ -5,7 +5,8 @@
 
 struct credential {
 	struct string_list helpers;
-	unsigned approved:1;
+	unsigned approved:1,
+		 configured:1;
 
 	char *username;
 	char *password;
@@ -25,5 +26,7 @@ struct credential {
 
 int credential_read(struct credential *, FILE *);
 void credential_from_url(struct credential *, const char *url);
+int credential_match(const struct credential *have,
+		     const struct credential *want);
 
 #endif /* CREDENTIAL_H */
diff --git a/t/t0300-credentials.sh b/t/t0300-credentials.sh
index 81a455f..e3f61f4 100755
--- a/t/t0300-credentials.sh
+++ b/t/t0300-credentials.sh
@@ -192,4 +192,46 @@ test_expect_success 'internal getpass does not ask for known username' '
 	EOF
 '
 
+HELPER="f() {
+		cat >/dev/null
+		echo username=foo
+		echo password=bar
+	}; f"
+test_expect_success 'respect configured credentials' '
+	test_config credential.helper "$HELPER" &&
+	check fill <<-\EOF
+	--
+	username=foo
+	password=bar
+	--
+	EOF
+'
+
+test_expect_success 'match configured credential' '
+	test_config credential.https://example.com.helper "$HELPER" &&
+	check fill <<-\EOF
+	protocol=https
+	host=example.com
+	path=repo.git
+	--
+	username=foo
+	password=bar
+	--
+	EOF
+'
+
+test_expect_success 'do not match configured credential' '
+	test_config credential.https://foo.helper "$HELPER" &&
+	check fill <<-\EOF
+	protocol=https
+	host=bar
+	--
+	username=askpass-username
+	password=askpass-password
+	--
+	askpass: Username for '\''https://bar'\'':
+	askpass: Password for '\''https://askpass-username@bar'\'':
+	EOF
+'
+
 test_done
diff --git a/t/t5550-http-fetch.sh b/t/t5550-http-fetch.sh
index 398a2d2..21e2f5d 100755
--- a/t/t5550-http-fetch.sh
+++ b/t/t5550-http-fetch.sh
@@ -101,6 +101,18 @@ test_expect_success 'http auth can request both user and pass' '
 	expect_askpass both user@host
 '
 
+test_expect_success 'http auth respects credential helper config' '
+	test_config_global credential.helper "f() {
+		cat >/dev/null
+		echo username=user@host
+		echo password=user@host
+	}; f" &&
+	>askpass-query &&
+	echo wrong >askpass-response &&
+	git clone "$HTTPD_URL/auth/repo.git" clone-auth-helper &&
+	expect_askpass none
+'
+
 test_expect_success 'fetch changes via http' '
 	echo content >>file &&
 	git commit -a -m two &&

-- 
1.7.8.rc4.4.g884ec
Previous: Jeff KingNext: Junio C Hamano
Message 7 of 30 in “[PATCHv2 0/13] credential helpers”
  1. Jeff KingDec 6, 2011
  2. 01/13 test-lib: add test_config_global variantJeff King, Dec 6, 2011
  3. 02/13 t5550: fix typoJeff King, Dec 6, 2011
  4. 03/13 introduce credentials APIJeff King, Dec 6, 2011
  5. 04/13 credential: add function for parsing url componentsJeff King, Dec 6, 2011
  6. 05/13 http: use credential API to get passwordsJeff King, Dec 6, 2011
  7. 06/13 credential: apply helper configJeff King, Dec 6, 2011
  8. Junio C HamanoDec 6, 2011
  9. Jeff KingDec 7, 2011
  10. Jeff KingDec 7, 2011
  11. 07/13 credential: add credential.*.usernameJeff King, Dec 6, 2011
  12. 08/13 credential: make relevance of http path configurableJeff King, Dec 6, 2011
  13. 09/13 docs: end-user documentation for the credential subsystemJeff King, Dec 6, 2011
  14. 10/13 credentials: add "cache" helperJeff King, Dec 6, 2011
  15. 11/13 strbuf: add strbuf_add*_urlencodeJeff King, Dec 6, 2011
  16. 12/13 credentials: add "store" helperJeff King, Dec 6, 2011
  17. Junio C HamanoDec 6, 2011
  18. Jeff KingDec 9, 2011
  19. 13/13 t: add test harness for external credential helpersJeff King, Dec 6, 2011
  20. Junio C HamanoDec 6, 2011
  21. Jeff KingDec 6, 2011
  22. Junio C HamanoDec 6, 2011
  23. Jeff KingDec 7, 2011
  24. Junio C HamanoDec 8, 2011
  25. Jeff KingDec 9, 2011
  26. Junio C HamanoDec 9, 2011
  27. Jeff KingDec 9, 2011
  28. Junio C HamanoDec 9, 2011
  29. Jeff KingDec 9, 2011
  30. Junio C HamanoDec 9, 2011

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