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authorJason A. Donenfeld <Jason@zx2c4.com>2014-01-16 14:39:17 +0400
committerJason A. Donenfeld <Jason@zx2c4.com>2014-01-16 15:13:39 +0400
commitb826537cb4aa2358027ffcb1dd6a87274734e962 (patch)
tree7c749c66d868cb996828d2b65a4bede58b5ebd62 /cgit.c
parentd6e9200cc35411f3f27426b608bcfdef9348e6d3 (diff)
authentication: use hidden form instead of referer
This also gives us some CSRF protection. Note that we make use of the hmac to protect the redirect value. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'cgit.c')
-rw-r--r--cgit.c22
1 files changed, 8 insertions, 14 deletions
diff --git a/cgit.c b/cgit.c
index c52ef33..be1265d 100644
--- 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);
}