mod_usertrack/5880: mod_usertrack overwrites cookies added by handlers preceding its fixup handler

[Gary Shea <sh...@gtsdesign.com>]

>Number:         5880
>Category:       mod_usertrack
>Synopsis:       mod_usertrack overwrites cookies added by handlers preceding its fixup handler
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Tue Mar 14 13:10:00 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     shea@gtsdesign.com
>Release:        all w/mod_usertrack
>Organization:
apache
>Environment:
present on all os, compilers, linkers, etc..  detected in:
'Linux gmong.gtsdesign.com 2.2.13 #11 Sun Mar 12 01:16:42 MST 2000 i586'
>Description:
mod_usertrack adds its cookie in a fixup handler.  If another module has
already added a cookie header via ap_table_add(r->headers_out,...), it will
be smushed because mod_usertrack uses ap_table_setn which treats the tables
as a 1-1 mapping from name to value, overwriting and/or deleting away any 
pre-existing Set-Cookie headers.
>How-To-Repeat:
Have to write a pre-fixup or a fixup handler that precedes mod_usertrack.
>Fix:
The fix I have been using (against Apache 1.3.12) is:

--- mod_usertrack.c.orig        Thu Mar  9 01:10:16 2000
+++ mod_usertrack.c     Thu Mar  9 01:10:49 2000
@@ -213,7 +213,7 @@
                                 dcfg->cookie_name, cookiebuf);
     }

-    ap_table_setn(r->headers_out, "Set-Cookie", new_cookie);
+    ap_table_add(r->headers_out, "Set-Cookie", new_cookie);
     ap_table_setn(r->notes, "cookie", ap_pstrdup(r->pool, cookiebuf));   /*
log first time */
     return;
 }
>Release-Note:
>Audit-Trail:
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