authentication: use hidden form instead of referer

[ps-cgit] / cgit.c

diff --git a/cgit.c b/cgit.c
index c52ef331b76995419aff93935784f1174150a8bc..be1265da6cb03ce99da6e1a68476164d660b10b9 100644 (file)
--- a/cgit.c
+++ b/cgit.c
@@ -614,22 +614,19 @@ static inline void open_auth_filter(struct cgit_context *ctx, const char *functi
                ctx->qry.url ? ctx->qry.url : "");
 }
 
+/* We intentionally keep this rather small, instead of looping and
+ * feeding it to the filter a couple bytes at a time. This way, the
+ * filter itself does not need to handle any denial of service or
+ * buffer bloat issues. If this winds up being too small, people
+ * will complain on the mailing list, and we'll increase it as needed. */
 #define MAX_AUTHENTICATION_POST_BYTES 4096
+/* The filter is expected to spit out "Status: " and all headers. */
 static inline void authenticate_post(struct cgit_context *ctx)
 {
-       if (ctx->env.http_referer && strlen(ctx->env.http_referer) > 0) {
-               html("Status: 302 Redirect\n");
-               html("Cache-Control: no-cache, no-store\n");
-               htmlf("Location: %s\n", ctx->env.http_referer);
-       } else {
-               html("Status: 501 Missing Referer\n");
-               html("Cache-Control: no-cache, no-store\n\n");
-               exit(0);
-       }
-
-       open_auth_filter(ctx, "authenticate-post");
        char buffer[MAX_AUTHENTICATION_POST_BYTES];
        int len;
+
+       open_auth_filter(ctx, "authenticate-post");
        len = ctx->env.content_length;
        if (len > MAX_AUTHENTICATION_POST_BYTES)
                len = MAX_AUTHENTICATION_POST_BYTES;
@@ -637,10 +634,7 @@ static inline void authenticate_post(struct cgit_context *ctx)
                die_errno("Could not read POST from stdin");
        if (write(STDOUT_FILENO, buffer, len) < 0)
                die_errno("Could not write POST to stdout");
-       /* The filter may now spit out a Set-Cookie: ... */
        cgit_close_filter(ctx->cfg.auth_filter);
-
-       html("\n");
        exit(0);
 }