credential/wincred: erase matching creds only

PATCH Superseded M Hickford via GitGitGadget 1 participant 2 messages Jun 24, 2023 – Jul 26, 2023

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M Hickford via GitGitGadget

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2023-06-24 08:53 UTC #0 lore raw

PATCH 1/1 credential/wincred: erase matching creds only

From: M Hickford <[email protected]>

Fix test "helper ... does not erase a password distinct from input" introduced in aeb21ce22e (credential: avoid erasing distinct password, 2023-06-13)

Signed-off-by M Hickford <[email protected]>

---
credential/wincred: erase more carefully

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1529%2Fhickford%2Ffix-wincred-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1529/hickford/fix-wincred-v1
Pull-Request: https://github.com/git/git/pull/1529

 .../wincred/git-credential-wincred.c          | 20 +++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

contrib/credential/wincred/git-credential-wincred.c +16 -4

index 96f10613aee..4cd56c42e24 100644
@@ -109,7 +109,18 @@ static int match_part_last(LPCWSTR *ptarget, LPCWSTR want, LPCWSTR delim)
 	return match_part_with_last(ptarget, want, delim, 1);
 }
 
-static int match_cred(const CREDENTIALW *cred)
+static int match_cred_password(const CREDENTIALW *cred) {
+	int ret;
+	WCHAR *cred_password = xmalloc(cred->CredentialBlobSize);
+	wcsncpy_s(cred_password, cred->CredentialBlobSize,
+		(LPCWSTR)cred->CredentialBlob,
+		cred->CredentialBlobSize / sizeof(WCHAR));
+	ret = !wcscmp(cred_password, password);
+	free(cred_password);
+	return ret;
+}
+
+static int match_cred(const CREDENTIALW *cred, int match_password)
 {
 	LPCWSTR target = cred->TargetName;
 	if (wusername && wcscmp(wusername, cred->UserName ? cred->UserName : L""))

@@ -119,7 +130,8 @@ static int match_cred(const CREDENTIALW *cred)
 		match_part(&target, protocol, L"://") &&
 		match_part_last(&target, wusername, L"@") &&
 		match_part(&target, host, L"/") &&
-		match_part(&target, path, L"");
+		match_part(&target, path, L"") &&
+		(!match_password || match_cred_password(cred));
 }
 
 static void get_credential(void)

@@ -134,7 +146,7 @@ static void get_credential(void)
 
 	/* search for the first credential that matches username */
 	for (i = 0; i < num_creds; ++i)
-		if (match_cred(creds[i])) {
+		if (match_cred(creds[i], 0)) {
 			write_item("username", creds[i]->UserName,
 				creds[i]->UserName ? wcslen(creds[i]->UserName) : 0);
 			write_item("password",

@@ -196,7 +208,7 @@ static void erase_credential(void)
 		return;
 
 	for (i = 0; i < num_creds; ++i) {
-		if (match_cred(creds[i]))
+		if (match_cred(creds[i], password != NULL))
 			CredDeleteW(creds[i]->TargetName, creds[i]->Type, 0);
 	}

base-commit: 6ff334181cfb6485d3ba50843038209a2a253907

Signature · 1 line

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M Hickford via GitGitGadget

author

2023-07-26 19:51 UTC #1 lore raw

PATCH v2 1/1 credential/wincred: erase matching creds only

From: M Hickford <[email protected]>

The credential erase request typically includes protocol, host, username and password.

credential-wincred erases stored credentials that match protocol, host and username, regardless of password.

This is confusing in the case the stored password differs from that in the request. This case can occur when multiple credential helpers are configured.

Only erase credential if stored password matches request (or request omits password).

This fixes test "helper (wincred) does not erase a password distinct from input" when t0303 is run with GIT_TEST_CREDENTIAL_HELPER set to "wincred". This test was added in aeb21ce22e (credential: avoid erasing distinct password, 2023-06-13).

Signed-off-by M Hickford <[email protected]>

---
credential/wincred: erase more carefully

Patch v2 expands the commit message

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1529%2Fhickford%2Ffix-wincred-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1529/hickford/fix-wincred-v2
Pull-Request: https://github.com/git/git/pull/1529

Range-diff vs v1:

1: d45c61d8f79 ! 1: 5e2aae38f72 credential/wincred: erase matching creds only
@@ Metadata
## Commit message ##
credential/wincred: erase matching creds only

- Fix test "helper ... does not erase a password distinct from input"
- introduced in aeb21ce22e (credential: avoid erasing distinct password,
- 2023-06-13)
+ The credential erase request typically includes protocol, host, username
+ and password.
+
+ credential-wincred erases stored credentials that match protocol,
+ host and username, regardless of password.
+
+ This is confusing in the case the stored password differs from that
+ in the request. This case can occur when multiple credential helpers are
+ configured.
+
+ Only erase credential if stored password matches request (or request
+ omits password).
+
+ This fixes test "helper (wincred) does not erase a password distinct
+ from input" when t0303 is run with GIT_TEST_CREDENTIAL_HELPER set to
+ "wincred". This test was added in aeb21ce22e (credential: avoid
+ erasing distinct password, 2023-06-13).

Signed-off-by M Hickford <[email protected]>

 .../wincred/git-credential-wincred.c          | 20 +++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

contrib/credential/wincred/git-credential-wincred.c +16 -4

index 96f10613aee..4cd56c42e24 100644
@@ -109,7 +109,18 @@ static int match_part_last(LPCWSTR *ptarget, LPCWSTR want, LPCWSTR delim)
 	return match_part_with_last(ptarget, want, delim, 1);
 }
 
-static int match_cred(const CREDENTIALW *cred)
+static int match_cred_password(const CREDENTIALW *cred) {
+	int ret;
+	WCHAR *cred_password = xmalloc(cred->CredentialBlobSize);
+	wcsncpy_s(cred_password, cred->CredentialBlobSize,
+		(LPCWSTR)cred->CredentialBlob,
+		cred->CredentialBlobSize / sizeof(WCHAR));
+	ret = !wcscmp(cred_password, password);
+	free(cred_password);
+	return ret;
+}
+
+static int match_cred(const CREDENTIALW *cred, int match_password)
 {
 	LPCWSTR target = cred->TargetName;
 	if (wusername && wcscmp(wusername, cred->UserName ? cred->UserName : L""))

@@ -119,7 +130,8 @@ static int match_cred(const CREDENTIALW *cred)
 		match_part(&target, protocol, L"://") &&
 		match_part_last(&target, wusername, L"@") &&
 		match_part(&target, host, L"/") &&
-		match_part(&target, path, L"");
+		match_part(&target, path, L"") &&
+		(!match_password || match_cred_password(cred));
 }
 
 static void get_credential(void)

@@ -134,7 +146,7 @@ static void get_credential(void)
 
 	/* search for the first credential that matches username */
 	for (i = 0; i < num_creds; ++i)
-		if (match_cred(creds[i])) {
+		if (match_cred(creds[i], 0)) {
 			write_item("username", creds[i]->UserName,
 				creds[i]->UserName ? wcslen(creds[i]->UserName) : 0);
 			write_item("password",

@@ -196,7 +208,7 @@ static void erase_credential(void)
 		return;
 
 	for (i = 0; i < num_creds; ++i) {
-		if (match_cred(creds[i]))
+		if (match_cred(creds[i], password != NULL))
 			CredDeleteW(creds[i]->TargetName, creds[i]->Type, 0);
 	}

base-commit: a80be152923a46f04a06bade7bcc72870e46ca09

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