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[PATCH 1/2] http: only reject basic auth credentials once they have been tried

From
QBQuentin Bouget <ypsah@devyard.org>
Date
Feb 4, 2024, 18:54 UTC
Message-ID
<20240204185427.39664-2-ypsah@devyard.org>
In-Reply-To
<20240204185427.39664-1-ypsah@devyard.org>

When CURLAUTH_GSSNEGOTIATE is enabled, it is currently assumed that the provided username/password relate to a GSSAPI auth attempt. In practice, forges such as gitlab can be deployed with HTTP basic auth and GSSAPI auth both listening on the same port, meaning just because the server supports GSSAPI and failed an authentication attempt using the provided credentials, it does not mean the credentials are not valid HTTP basic auth credentials.

This is documented as a long running bug here [1] and breaks token-based authentication when the token is provided in the remote's URL itself.

This commit makes it so credentials are only dropped once they have been tried both as GSSAPI credentials and HTTP basic auth credentials.

[1] https://gitlab.com/gitlab-org/gitlab/-/blob/b0e0d25646d1992fefda863febdcba8d4c7a1bbf/doc/integration/kerberos.md#L250
Signed-off-by: Quentin Bouget <ypsah@devyard.org>
---
 http.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/http.c b/http.c
index e73b136e58..ccea19ac47 100644
--- a/http.c
+++ b/http.c
@@ -1758,10 +1758,7 @@ static int handle_curl_result(struct slot_results *results)
 	} 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 {
+		if ((http_auth_methods & CURLAUTH_GSSNEGOTIATE) == CURLAUTH_GSSNEGOTIATE) {
 			http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
 			if (results->auth_avail) {
 				http_auth_methods &= results->auth_avail;
@@ -1769,6 +1766,9 @@ static int handle_curl_result(struct slot_results *results)
 			}
 			return HTTP_REAUTH;
 		}
+		if (http_auth.username && http_auth.password)
+			credential_reject(&http_auth);
+		return HTTP_NOAUTH;
 	} else {
 		if (results->http_connectcode == 407)
 			credential_reject(&proxy_auth);
-- 
2.43.0
Previous: Quentin BougetNext: Junio C Hamano
Message 2 of 15 in “Fix gitlab's token-based authentication w/ kerberos”
  1. 0/2 Fix gitlab's token-based authentication w/ kerberosQuentin Bouget, Feb 4, 2024
  2. 1/2 http: only reject basic auth credentials once they have been triedQuentin Bouget, Feb 4, 2024
  3. Junio C HamanoFeb 4, 2024
  4. Quentin BougetFeb 5, 2024
  5. Patrick SteinhardtFeb 5, 2024
  6. 2/2 http: prevent redirect from dropping credentials during reauthQuentin Bouget, Feb 4, 2024
  7. brian m. carlsonFeb 4, 2024
  8. Quentin BougetFeb 5, 2024
  9. brian m. carlsonFeb 5, 2024
  10. rsbecker@nexbridge.comFeb 5, 2024
  11. Junio C HamanoFeb 4, 2024
  12. Quentin BougetFeb 5, 2024
  13. rsbecker@nexbridge.comFeb 4, 2024
  14. Quentin BougetFeb 5, 2024
  15. Robert CoupFeb 5, 2024

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