Subject: [PATCH v2] credential-cache: respect request capabilities

From: "M Hickford via GitGitGadget" <[email-masked]>
Date: Mon, 06 Jan 2025 19:52:11 +0000

From: M Hickford <[email-masked]>

Previously, credential-cache responded with capability[]=authtype
regardless of request.

The capabilities in a credential helper response should be a subset of
the capabilities in the request.

Signed-off-by: M Hickford <[email-masked]>
---
    credential-cache: respect request capabilities

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1842%2Fhickford%2Fcache-capability-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1842/hickford/cache-capability-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/1842

Range-diff vs v1:

 1:  9197941029f ! 1:  696780d4782 credential-cache: respect request capabilities
     @@ t/lib-credential.sh: helper_test_authtype() {
       		EOF
       	'
       
     -+	test_expect_success "helper ($HELPER) does not get authtype and credential without authtype capability" '
     ++	test_expect_success "helper ($HELPER) get authtype only if request has authtype capability" '
      +		check fill $HELPER <<-\EOF
      +		protocol=https
      +		host=git.example.com
     @@ t/lib-credential.sh: helper_test_authtype() {
       	test_expect_success "helper ($HELPER) stores authtype and credential with username" '
       		check approve $HELPER <<-\EOF
       		capability[]=authtype
     -
     - ## t/t0303-credential-external.sh ##
     -@@ t/t0303-credential-external.sh: helper_test_clean "$GIT_TEST_CREDENTIAL_HELPER"
     - helper_test "$GIT_TEST_CREDENTIAL_HELPER"
     - helper_test_password_expiry_utc "$GIT_TEST_CREDENTIAL_HELPER"
     - helper_test_oauth_refresh_token "$GIT_TEST_CREDENTIAL_HELPER"
     -+helper_test_authtype "$GIT_TEST_CREDENTIAL_HELPER"
     - 
     - if test -z "$GIT_TEST_CREDENTIAL_HELPER_TIMEOUT"; then
     - 	say "# skipping timeout tests (GIT_TEST_CREDENTIAL_HELPER_TIMEOUT not set)"

 builtin/credential-cache--daemon.c | 11 +++++------
 t/lib-credential.sh                | 15 +++++++++++++++
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/builtin/credential-cache--daemon.c b/builtin/credential-cache--daemon.c
index bc22f5c6d24..692216cf83c 100644
--- a/builtin/credential-cache--daemon.c
+++ b/builtin/credential-cache--daemon.c
@@ -134,17 +134,16 @@ static void serve_one_client(FILE *in, FILE *out)
 	else if (!strcmp(action.buf, "get")) {
 		struct credential_cache_entry *e = lookup_credential(&c);
 		if (e) {
-			e->item.capa_authtype.request_initial = 1;
-			e->item.capa_authtype.request_helper = 1;
-
-			fprintf(out, "capability[]=authtype\n");
+			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_RESPONSE)) {
+				fprintf(out, "capability[]=authtype\n");
+			}
 			if (e->item.username)
 				fprintf(out, "username=%s\n", e->item.username);
 			if (e->item.password)
 				fprintf(out, "password=%s\n", e->item.password);
-			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_HELPER) && e->item.authtype)
+			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_RESPONSE) && e->item.authtype)
 				fprintf(out, "authtype=%s\n", e->item.authtype);
-			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_HELPER) && e->item.credential)
+			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_RESPONSE) && e->item.credential)
 				fprintf(out, "credential=%s\n", e->item.credential);
 			if (e->item.password_expiry_utc != TIME_MAX)
 				fprintf(out, "password_expiry_utc=%"PRItime"\n",
diff --git a/t/lib-credential.sh b/t/lib-credential.sh
index 58b9c740605..324ecc792d5 100644
--- a/t/lib-credential.sh
+++ b/t/lib-credential.sh
@@ -566,6 +566,21 @@ helper_test_authtype() {
 		EOF
 	'
 
+	test_expect_success "helper ($HELPER) get authtype only if request has authtype capability" '
+		check fill $HELPER <<-\EOF
+		protocol=https
+		host=git.example.com
+		--
+		protocol=https
+		host=git.example.com
+		username=askpass-username
+		password=askpass-password
+		--
+		askpass: Username for '\''https://git.example.com'\'':
+		askpass: Password for '\''https://[email-masked]'\'':
+		EOF
+	'
+
 	test_expect_success "helper ($HELPER) stores authtype and credential with username" '
 		check approve $HELPER <<-\EOF
 		capability[]=authtype

base-commit: 92999a42db1c5f43f330e4f2bca4026b5b81576f
-- 
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