Merge branch 'jk/maint-http-half-auth-push'

Pushing to smart HTTP server with recent Git fails without having
the username in the URL to force authentication, if the server is
configured to allow GET anonymously, while requiring authentication
for POST.

* jk/maint-http-half-auth-push:
  http: prompt for credentials on failed POST
  http: factor out http error code handling
  t: test http access to "half-auth" repositories
  t: test basic smart-http authentication
  t/lib-httpd: recognize */smart/* repos as smart-http
  t/lib-httpd: only route auth/dumb to dumb repos
  t5550: factor out http auth setup
  t5550: put auth-required repo in auth/dumb

9 files changed, 173 insertions, 108 deletions

diff --git a/http.c b/http.c
index 18bc6bf7bf..9bac1d89fd 100644
--- a/http.c
+++ b/http.c
@@ -745,6 +745,35 @@ char *get_remote_object_url(const char *url, const char *hex,
 	return strbuf_detach(&buf, NULL);
 }
 
+int handle_curl_result(struct active_request_slot *slot)
+{
+	struct slot_results *results = slot->results;
+
+	if (results->curl_result == CURLE_OK) {
+		credential_approve(&http_auth);
+		return HTTP_OK;
+	} else if (missing_target(results))
+		return HTTP_MISSING_TARGET;
+	else if (results->http_code == 401) {
+		if (http_auth.username && http_auth.password) {
+			credential_reject(&http_auth);
+			return HTTP_NOAUTH;
+		} else {
+			credential_fill(&http_auth);
+			init_curl_http_auth(slot->curl);
+			return HTTP_REAUTH;
+		}
+	} else {
+#if LIBCURL_VERSION_NUM >= 0x070c00
+		if (!curl_errorstr[0])
+			strlcpy(curl_errorstr,
+				curl_easy_strerror(results->curl_result),
+				sizeof(curl_errorstr));
+#endif
+		return HTTP_ERROR;
+	}
+}
+
 /* http_request() targets */
 #define HTTP_REQUEST_STRBUF	0
 #define HTTP_REQUEST_FILE	1
@@ -792,28 +821,7 @@ static int http_request(const char *url, void *result, int target, int options)
 
 	if (start_active_slot(slot)) {
 		run_active_slot(slot);
-		if (results.curl_result == CURLE_OK)
-			ret = HTTP_OK;
-		else if (missing_target(&results))
-			ret = HTTP_MISSING_TARGET;
-		else if (results.http_code == 401) {
-			if (http_auth.username && http_auth.password) {
-				credential_reject(&http_auth);
-				ret = HTTP_NOAUTH;
-			} else {
-				credential_fill(&http_auth);
-				init_curl_http_auth(slot->curl);
-				ret = HTTP_REAUTH;
-			}
-		} else {
-#if LIBCURL_VERSION_NUM >= 0x070c00
-			if (!curl_errorstr[0])
-				strlcpy(curl_errorstr,
-					curl_easy_strerror(results.curl_result),
-					sizeof(curl_errorstr));
-#endif
-			ret = HTTP_ERROR;
-		}
+		ret = handle_curl_result(slot);
 	} else {
 		error("Unable to start HTTP request for %s", url);
 		ret = HTTP_START_FAILED;
@@ -822,9 +830,6 @@ static int http_request(const char *url, void *result, int target, int options)
 	curl_slist_free_all(headers);
 	strbuf_release(&buf);
 
-	if (ret == HTTP_OK)
-		credential_approve(&http_auth);
-
 	return ret;
 }
 
diff --git a/http.h b/http.h
index 915c2862a6..12de25597d 100644
--- a/http.h
+++ b/http.h
@@ -78,6 +78,7 @@ extern int start_active_slot(struct active_request_slot *slot);
 extern void run_active_slot(struct active_request_slot *slot);
 extern void finish_active_slot(struct active_request_slot *slot);
 extern void finish_all_active_slots(void);
+extern int handle_curl_result(struct active_request_slot *slot);
 
 #ifdef USE_CURL_MULTI
 extern void fill_active_slots(void);
diff --git a/remote-curl.c b/remote-curl.c
index 04a9d6277d..3ec474fc63 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -362,16 +362,17 @@ static size_t rpc_in(char *ptr, size_t eltsize,
 
 static int run_slot(struct active_request_slot *slot)
 {
-	int err = 0;
+	int err;
 	struct slot_results results;
 
 	slot->results = &results;
 	slot->curl_result = curl_easy_perform(slot->curl);
 	finish_active_slot(slot);
 
-	if (results.curl_result != CURLE_OK) {
-		err |= error("RPC failed; result=%d, HTTP code = %ld",
-			results.curl_result, results.http_code);
+	err = handle_curl_result(slot);
+	if (err != HTTP_OK && err != HTTP_REAUTH) {
+		error("RPC failed; result=%d, HTTP code = %ld",
+		      results.curl_result, results.http_code);
 	}
 
 	return err;
@@ -436,9 +437,11 @@ static int post_rpc(struct rpc_state *rpc)
 	}
 
 	if (large_request) {
-		err = probe_rpc(rpc);
-		if (err)
-			return err;
+		do {
+			err = probe_rpc(rpc);
+		} while (err == HTTP_REAUTH);
+		if (err != HTTP_OK)
+			return -1;
 	}
 
 	slot = get_active_slot();
@@ -525,7 +528,11 @@ static int post_rpc(struct rpc_state *rpc)
 	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 	curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 
-	err = run_slot(slot);
+	do {
+		err = run_slot(slot);
+	} while (err == HTTP_REAUTH && !large_request && !use_gzip);
+	if (err != HTTP_OK)
+		err = -1;
 
 	curl_slist_free_all(headers);
 	free(gzip_body);
diff --git a/t/lib-httpd.sh b/t/lib-httpd.sh
index d773542680..02f442bfad 100644
--- a/t/lib-httpd.sh
+++ b/t/lib-httpd.sh
@@ -167,3 +167,42 @@ test_http_push_nonff() {
 		test_i18ngrep "Updates were rejected because" output
 	'
 }
+
+setup_askpass_helper() {
+	test_expect_success 'setup askpass helper' '
+		write_script "$TRASH_DIRECTORY/askpass" <<-\EOF &&
+		echo >>"$TRASH_DIRECTORY/askpass-query" "askpass: $*" &&
+		cat "$TRASH_DIRECTORY/askpass-response"
+		EOF
+		GIT_ASKPASS="$TRASH_DIRECTORY/askpass" &&
+		export GIT_ASKPASS &&
+		export TRASH_DIRECTORY
+	'
+}
+
+set_askpass() {
+	>"$TRASH_DIRECTORY/askpass-query" &&
+	echo "$*" >"$TRASH_DIRECTORY/askpass-response"
+}
+
+expect_askpass() {
+	dest=$HTTPD_DEST
+	{
+		case "$1" in
+		none)
+			;;
+		pass)
+			echo "askpass: Password for 'http://$2@$dest': "
+			;;
+		both)
+			echo "askpass: Username for 'http://$dest': "
+			echo "askpass: Password for 'http://$2@$dest': "
+			;;
+		*)
+			false
+			;;
+		esac
+	} >"$TRASH_DIRECTORY/askpass-expect" &&
+	test_cmp "$TRASH_DIRECTORY/askpass-expect" \
+		 "$TRASH_DIRECTORY/askpass-query"
+}
diff --git a/t/lib-httpd/apache.conf b/t/lib-httpd/apache.conf
index 36b1596a10..49d5d877ce 100644
--- a/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@ -46,24 +46,22 @@ PassEnv GIT_VALGRIND
 PassEnv GIT_VALGRIND_OPTIONS
 
 Alias /dumb/ www/
-Alias /auth/ www/auth/
+Alias /auth/dumb/ www/auth/dumb/
 
-<Location /smart/>
+<LocationMatch /smart/>
 	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
 	SetEnv GIT_HTTP_EXPORT_ALL
-</Location>
-<Location /smart_noexport/>
+</LocationMatch>
+<LocationMatch /smart_noexport/>
 	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
-</Location>
-<Location /smart_custom_env/>
+</LocationMatch>
+<LocationMatch /smart_custom_env/>
 	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
 	SetEnv GIT_HTTP_EXPORT_ALL
 	SetEnv GIT_COMMITTER_NAME "Custom User"
 	SetEnv GIT_COMMITTER_EMAIL custom@example.com
-</Location>
-ScriptAlias /smart/ ${GIT_EXEC_PATH}/git-http-backend/
-ScriptAlias /smart_noexport/ ${GIT_EXEC_PATH}/git-http-backend/
-ScriptAlias /smart_custom_env/ ${GIT_EXEC_PATH}/git-http-backend/
+</LocationMatch>
+ScriptAliasMatch /smart_*[^/]*/(.*) ${GIT_EXEC_PATH}/git-http-backend/$1
 <Directory ${GIT_EXEC_PATH}>
 	Options FollowSymlinks
 </Directory>
@@ -94,6 +92,13 @@ SSLEngine On
 	Require valid-user
 </Location>
 
+<LocationMatch "^/auth-push/.*/git-receive-pack$">
+	AuthType Basic
+	AuthName "git-auth"
+	AuthUserFile passwd
+	Require valid-user
+</LocationMatch>
+
 <IfDefine DAV>
 	LoadModule dav_module modules/mod_dav.so
 	LoadModule dav_fs_module modules/mod_dav_fs.so
diff --git a/t/t5540-http-push.sh b/t/t5540-http-push.sh
index 1eea647656..f141f2d1da 100755
--- a/t/t5540-http-push.sh
+++ b/t/t5540-http-push.sh
@@ -46,15 +46,7 @@ test_expect_success 'create password-protected repository' '
 	       "$HTTPD_DOCUMENT_ROOT_PATH/auth/dumb/test_repo.git"
 '
 
-test_expect_success 'setup askpass helper' '
-	cat >askpass <<-\EOF &&
-	#!/bin/sh
-	echo user@host
-	EOF
-	chmod +x askpass &&
-	GIT_ASKPASS="$PWD/askpass" &&
-	export GIT_ASKPASS
-'
+setup_askpass_helper
 
 test_expect_success 'clone remote repository' '
 	cd "$ROOT_PATH" &&
@@ -162,6 +154,7 @@ test_http_push_nonff "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git \
 
 test_expect_success 'push to password-protected repository (user in URL)' '
 	test_commit pw-user &&
+	set_askpass user@host &&
 	git push "$HTTPD_URL_USER/auth/dumb/test_repo.git" HEAD &&
 	git rev-parse --verify HEAD >expect &&
 	git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH/auth/dumb/test_repo.git" \
@@ -169,9 +162,15 @@ test_expect_success 'push to password-protected repository (user in URL)' '
 	test_cmp expect actual
 '
 
+test_expect_failure 'user was prompted only once for password' '
+	expect_askpass pass user@host
+'
+
 test_expect_failure 'push to password-protected repository (no user in URL)' '
 	test_commit pw-nouser &&
+	set_askpass user@host &&
 	git push "$HTTPD_URL/auth/dumb/test_repo.git" HEAD &&
+	expect_askpass both user@host
 	git rev-parse --verify HEAD >expect &&
 	git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH/auth/dumb/test_repo.git" \
 		rev-parse --verify HEAD >actual &&
diff --git a/t/t5541-http-push.sh b/t/t5541-http-push.sh
index 624633aced..4b4b4a604f 100755
--- a/t/t5541-http-push.sh
+++ b/t/t5541-http-push.sh
@@ -36,6 +36,8 @@ test_expect_success 'setup remote repository' '
 	mv test_repo.git "$HTTPD_DOCUMENT_ROOT_PATH"
 '
 
+setup_askpass_helper
+
 cat >exp <<EOF
 GET  /smart/test_repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
 POST /smart/test_repo.git/git-upload-pack HTTP/1.1 200
@@ -269,5 +271,29 @@ test_expect_success 'http push respects GIT_COMMITTER_* in reflog' '
 	test_cmp expect actual
 '
 
+test_expect_success 'push over smart http with auth' '
+	cd "$ROOT_PATH/test_repo_clone" &&
+	echo push-auth-test >expect &&
+	test_commit push-auth-test &&
+	set_askpass user@host &&
+	git push "$HTTPD_URL"/auth/smart/test_repo.git &&
+	git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH/test_repo.git" \
+		log -1 --format=%s >actual &&
+	expect_askpass both user@host &&
+	test_cmp expect actual
+'
+
+test_expect_success 'push to auth-only-for-push repo' '
+	cd "$ROOT_PATH/test_repo_clone" &&
+	echo push-half-auth >expect &&
+	test_commit push-half-auth &&
+	set_askpass user@host &&
+	git push "$HTTPD_URL"/auth-push/smart/test_repo.git &&
+	git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH/test_repo.git" \
+		log -1 --format=%s >actual &&
+	expect_askpass both user@host &&
+	test_cmp expect actual
+'
+
 stop_httpd
 test_done
diff --git a/t/t5550-http-fetch.sh b/t/t5550-http-fetch.sh
index b06f817af3..16ef0419e9 100755
--- a/t/t5550-http-fetch.sh
+++ b/t/t5550-http-fetch.sh
@@ -41,68 +41,34 @@ test_expect_success 'clone http repository' '
 '
 
 test_expect_success 'create password-protected repository' '
-	mkdir "$HTTPD_DOCUMENT_ROOT_PATH/auth/" &&
+	mkdir -p "$HTTPD_DOCUMENT_ROOT_PATH/auth/dumb/" &&
 	cp -Rf "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" \
-	       "$HTTPD_DOCUMENT_ROOT_PATH/auth/repo.git"
-'
-
-test_expect_success 'setup askpass helpers' '
-	cat >askpass <<-EOF &&
-	#!/bin/sh
-	echo >>"$PWD/askpass-query" "askpass: \$*" &&
-	cat "$PWD/askpass-response"
-	EOF
-	chmod +x askpass &&
-	GIT_ASKPASS="$PWD/askpass" &&
-	export GIT_ASKPASS
-'
-
-expect_askpass() {
-	dest=$HTTPD_DEST
-	{
-		case "$1" in
-		none)
-			;;
-		pass)
-			echo "askpass: Password for 'http://$2@$dest': "
-			;;
-		both)
-			echo "askpass: Username for 'http://$dest': "
-			echo "askpass: Password for 'http://$2@$dest': "
-			;;
-		*)
-			false
-			;;
-		esac
-	} >askpass-expect &&
-	test_cmp askpass-expect askpass-query
-}
+	       "$HTTPD_DOCUMENT_ROOT_PATH/auth/dumb/repo.git"
+'
+
+setup_askpass_helper
 
 test_expect_success 'cloning password-protected repository can fail' '
-	>askpass-query &&
-	echo wrong >askpass-response &&
-	test_must_fail git clone "$HTTPD_URL/auth/repo.git" clone-auth-fail &&
+	set_askpass wrong &&
+	test_must_fail git clone "$HTTPD_URL/auth/dumb/repo.git" clone-auth-fail &&
 	expect_askpass both wrong
 '
 
 test_expect_success 'http auth can use user/pass in URL' '
-	>askpass-query &&
-	echo wrong >askpass-response &&
-	git clone "$HTTPD_URL_USER_PASS/auth/repo.git" clone-auth-none &&
+	set_askpass wrong &&
+	git clone "$HTTPD_URL_USER_PASS/auth/dumb/repo.git" clone-auth-none &&
 	expect_askpass none
 '
 
 test_expect_success 'http auth can use just user in URL' '
-	>askpass-query &&
-	echo user@host >askpass-response &&
-	git clone "$HTTPD_URL_USER/auth/repo.git" clone-auth-pass &&
+	set_askpass user@host &&
+	git clone "$HTTPD_URL_USER/auth/dumb/repo.git" clone-auth-pass &&
 	expect_askpass pass user@host
 '
 
 test_expect_success 'http auth can request both user and pass' '
-	>askpass-query &&
-	echo user@host >askpass-response &&
-	git clone "$HTTPD_URL/auth/repo.git" clone-auth-both &&
+	set_askpass user@host &&
+	git clone "$HTTPD_URL/auth/dumb/repo.git" clone-auth-both &&
 	expect_askpass both user@host
 '
 
@@ -112,25 +78,22 @@ test_expect_success 'http auth respects credential helper config' '
 		echo username=user@host
 		echo password=user@host
 	}; f" &&
-	>askpass-query &&
-	echo wrong >askpass-response &&
-	git clone "$HTTPD_URL/auth/repo.git" clone-auth-helper &&
+	set_askpass wrong &&
+	git clone "$HTTPD_URL/auth/dumb/repo.git" clone-auth-helper &&
 	expect_askpass none
 '
 
 test_expect_success 'http auth can get username from config' '
 	test_config_global "credential.$HTTPD_URL.username" user@host &&
-	>askpass-query &&
-	echo user@host >askpass-response &&
-	git clone "$HTTPD_URL/auth/repo.git" clone-auth-user &&
+	set_askpass user@host &&
+	git clone "$HTTPD_URL/auth/dumb/repo.git" clone-auth-user &&
 	expect_askpass pass user@host
 '
 
 test_expect_success 'configured username does not override URL' '
 	test_config_global "credential.$HTTPD_URL.username" wrong &&
-	>askpass-query &&
-	echo user@host >askpass-response &&
-	git clone "$HTTPD_URL_USER/auth/repo.git" clone-auth-user2 &&
+	set_askpass user@host &&
+	git clone "$HTTPD_URL_USER/auth/dumb/repo.git" clone-auth-user2 &&
 	expect_askpass pass user@host
 '
 
diff --git a/t/t5551-http-fetch.sh b/t/t5551-http-fetch.sh
index 91eaf53d1d..2db5c35641 100755
--- a/t/t5551-http-fetch.sh
+++ b/t/t5551-http-fetch.sh
@@ -27,6 +27,8 @@ test_expect_success 'create http-accessible bare repository' '
 	git push public master:master
 '
 
+setup_askpass_helper
+
 cat >exp <<EOF
 > GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1
 > Accept: */*
@@ -109,6 +111,24 @@ test_expect_success 'follow redirects (302)' '
 	git clone $HTTPD_URL/smart-redir-temp/repo.git --quiet repo-t
 '
 
+test_expect_success 'clone from password-protected repository' '
+	echo two >expect &&
+	set_askpass user@host &&
+	git clone --bare "$HTTPD_URL/auth/smart/repo.git" smart-auth &&
+	expect_askpass both user@host &&
+	git --git-dir=smart-auth log -1 --format=%s >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone from auth-only-for-push repository' '
+	echo two >expect &&
+	set_askpass wrong &&
+	git clone --bare "$HTTPD_URL/auth-push/smart/repo.git" smart-noauth &&
+	expect_askpass none &&
+	git --git-dir=smart-noauth log -1 --format=%s >actual &&
+	test_cmp expect actual
+'
+
 test -n "$GIT_TEST_LONG" && test_set_prereq EXPENSIVE
 
 test_expect_success EXPENSIVE 'create 50,000 tags in the repo' '