1 files changed, 183 insertions, 0 deletions
diff --git a/auth_mellon_cookie.c b/auth_mellon_cookie.c
new file mode 100644
index 0000000..9bbb716
--- /dev/null
+++ b/auth_mellon_cookie.c
@@ -0,0 +1,183 @@
+/*
+ *
+ *   auth_mellon_cookie.c: an authentication apache module
+ *   Copyright © 2003-2007 UNINETT (http://www.uninett.no/)
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include "auth_mellon.h"
+
+
+/* This function retrieves the name of our cookie.
+ *
+ * Parameters:
+ *  request_rec *r       The current request. Used to find the identifier of
+ *                       the cookie. We also allocate memory from r->pool.
+ *
+ * Returns:
+ *  The name of the cookie.
+ */
+static const char *am_cookie_name(request_rec *r)
+{
+    am_dir_cfg_rec *dir_cfg;
+
+    dir_cfg = am_get_dir_cfg(r);
+
+    return apr_pstrcat(r->pool, "mellon-", dir_cfg->varname, NULL);
+}
+
+
+/* This functions finds the value of our cookie.
+ *
+ * Parameters:
+ *  request_rec *r       The request we should find the cookie in.
+ *
+ * Returns:
+ *  The value of the cookie, or NULL if we don't find the cookie.
+ */
+const char *am_cookie_get(request_rec *r)
+{
+    const char *name;
+    const char *value;
+    const char *cookie;
+    char *buffer, *end;
+
+    /* don't run for subrequests */
+    if (r->main) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
+                     "cookie_get: Subrequest, so return NULL");        
+        return NULL;
+    }
+
+    name = am_cookie_name(r);
+
+    cookie = apr_table_get(r->headers_in, "Cookie");
+    if(cookie == NULL) {
+        return NULL;
+    }
+
+    for(value = ap_strstr_c(cookie, name); value != NULL;
+        value = ap_strstr_c(value + 1, name)) {
+
+        if(value != cookie) {
+            /* value isn't pointing to the start of the string. */
+            switch(value[-1]) {
+                /* We allow the name in the cookie-string to be
+                 * preceeded by [\t; ]. Note that only ' ' should be used
+                 * by browsers. We test against the others just to be sure.
+                 */
+            case '\t':
+            case ';':
+            case ' ':
+                break;
+            default:
+                /* value isn't preceeded by one of the listed characters, and
+                 * therefore we assume that it is part of another cookie.
+                 */
+                continue; /* Search for the next instance of the name. */
+            }
+        }
+
+        if(value[strlen(name)] != '=') {
+            /* We don't have an equal-sign right after the name. Therefore we
+             * assume that what we have matched is only part of a longer name.
+             * We continue searching.
+             */
+            continue;
+        }
+
+        /* Now we have something that matches /[^ ,\t]<name>=/. The value
+         * (following the equal-sign) can be found at value + strlen(name) + 1.
+         */
+        value += strlen(name) + 1;
+
+        buffer = apr_pstrdup(r->pool, value);
+        end = strchr(buffer, ';');
+        if(end) {
+            *end = '\0';
+        }
+
+        return buffer;
+    }
+
+    /* We didn't find the cookie. */
+    return NULL;
+}
+
+
+/* This function sets the value of our cookie.
+ *
+ * Parameters:
+ *  request_rec *r       The request we should set the cookie in.
+ *  const char *id       The value ve should store in the cookie.
+ *
+ * Returns:
+ *  Nothing.
+ */
+void am_cookie_set(request_rec *r, const char *id)
+{
+    const char *name;
+    char *cookie;
+
+    if (id == NULL)
+        return;
+
+    name = am_cookie_name(r);
+
+    cookie = apr_psprintf(r->pool, "%s=%s; Version=1; Path=/", name, id);
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
+                 "cookie_set: %s", cookie);
+
+    /* For now we're setting the cookie in both header tables since
+     * it is unclear which the user will be sent.  After a minor release
+     * this suddenly changed from headers_out to err_headers_out, so to
+     * be on the safe side...
+     */
+    apr_table_addn(r->headers_out, "Set-Cookie", cookie);
+    apr_table_addn(r->err_headers_out, "Set-Cookie", cookie);
+}
+
+
+/* This function deletes the cookie.
+ *
+ * Parameters:
+ *  request_rec *r       The request we should clear the cookie in. We will
+ *                       allocate any neccesary memory from r->pool.
+ *
+ * Returns:
+ *  Nothing.
+ */
+void am_cookie_delete(request_rec *r)
+{
+    const char *name;
+    char *cookie;
+
+    name = am_cookie_name(r);
+
+
+    /* Format a cookie. To delete a cookie we set the expires-timestamp
+     * to the past.
+     */
+    cookie = apr_psprintf(r->pool, "%s=NULL;"
+                          " version=1;"
+                          " expires=Thu, 01-Jan-1970 00:00:00 GMT;"
+                          " path=/",
+                          name);
+
+    apr_table_addn(r->headers_out, "Set-Cookie", cookie);
+    apr_table_addn(r->err_headers_out, "Set-Cookie", cookie);
+}