From 133bf49fdf9f4dc577e07d5e057c6b4bf62f987c Mon Sep 17 00:00:00 2001
From: Graham Leggett <minfrin@apache.org>
Date: Mon, 30 Dec 2013 08:54:09 +0000
Subject: [PATCH] mod_authnz_dbd: Support the expression parser within the
 require directives.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1554168 13f79535-47bb-0310-9956-ffa450edef68
---
 CHANGES                           |  3 ++
 docs/log-message-tags/next-number |  2 +-
 docs/manual/expr.xml              |  1 +
 docs/manual/mod/mod_authz_dbd.xml | 49 +++++++++++++++++++++++++++++++
 modules/aaa/mod_authz_dbd.c       | 36 +++++++++++++++++++++--
 5 files changed, 88 insertions(+), 3 deletions(-)

diff --git a/CHANGES b/CHANGES
index 133fe72039..8cf00cf801 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,9 @@
                                                          -*- coding: utf-8 -*-
 Changes with Apache 2.5.0
 
+  *) mod_authnz_dbd: Support the expression parser within the require
+     directives. [Graham Leggett]
+
   *) mod_authnz_ldap: Support the expression parser within the require
      directives. [Graham Leggett]
 
diff --git a/docs/log-message-tags/next-number b/docs/log-message-tags/next-number
index 06e45f3b09..198c10de8d 100644
--- a/docs/log-message-tags/next-number
+++ b/docs/log-message-tags/next-number
@@ -1 +1 @@
-2590
+2591
diff --git a/docs/manual/expr.xml b/docs/manual/expr.xml
index dc9e8fbe47..292a389523 100644
--- a/docs/manual/expr.xml
+++ b/docs/manual/expr.xml
@@ -56,6 +56,7 @@
 <seealso><a href="mod/mod_authnz_ldap.html#reqdn">Require ldap-dn</a></seealso>
 <seealso><a href="mod/mod_authnz_ldap.html#reqattribute">Require ldap-attribute</a></seealso>
 <seealso><a href="mod/mod_authnz_ldap.html#reqfilter">Require ldap-filter</a></seealso>
+<seealso><a href="mod/mod_authz_dbd.html#reqgroup">Require dbd-group</a></seealso>
 <seealso><directive module="mod_ssl">SSLRequire</directive></seealso>
 <seealso><directive module="mod_log_debug">LogMessage</directive></seealso>
 <seealso><module>mod_include</module></seealso>
diff --git a/docs/manual/mod/mod_authz_dbd.xml b/docs/manual/mod/mod_authz_dbd.xml
index fc441791a9..10b9d7572a 100644
--- a/docs/manual/mod/mod_authz_dbd.xml
+++ b/docs/manual/mod/mod_authz_dbd.xml
@@ -52,6 +52,55 @@
 <seealso><directive module="mod_dbd">DBDriver</directive></seealso>
 <seealso><directive module="mod_dbd">DBDParams</directive></seealso>
 
+<section id="requiredirectives"><title>The Require Directives</title>
+
+    <p>Apache's <directive module="mod_authz_core">Require</directive>
+    directives are used during the authorization phase to ensure that
+    a user is allowed to access a resource.  mod_authz_dbd extends the
+    authorization types with <code>dbd-group</code>, <code>dbd-login</code> and
+    <code>dbd-logout</code>.</p>
+
+    <p>Since v2.5.0, <a href="../expr.html">expressions</a> are supported
+    within the DBD require directives.</p>
+
+<section id="reqgroup"><title>Require dbd-group</title>
+
+    <p>This directive specifies group membership that is required for the
+    user to gain access.</p>
+
+    <highlight language="config">
+      Require dbd-group team
+      AuthzDBDQuery "SELECT group FROM authz WHERE user = %s"
+    </highlight>
+
+</section>
+
+<section id="reqlogin"><title>Require dbd-login</title>
+
+    <p>This directive specifies a query to be run indicating the user
+    has logged in.</p>
+
+    <highlight language="config">
+      Require dbd-login
+      AuthzDBDQuery "UPDATE authn SET login = 'true' WHERE user = %s"
+    </highlight>
+
+</section>
+
+<section id="reqlogout"><title>Require dbd-logout</title>
+
+    <p>This directive specifies a query to be run indicating the user
+    has logged out.</p>
+
+    <highlight language="config">
+      Require dbd-logout
+      AuthzDBDQuery "UPDATE authn SET login = 'false' WHERE user = %s"
+    </highlight>
+
+</section>
+
+</section>
+
 <section id="login">
 <title>Database Login</title>
 <p>
diff --git a/modules/aaa/mod_authz_dbd.c b/modules/aaa/mod_authz_dbd.c
index 2d4925f522..d766d55486 100644
--- a/modules/aaa/mod_authz_dbd.c
+++ b/modules/aaa/mod_authz_dbd.c
@@ -253,6 +253,11 @@ static authz_status dbdgroup_check_authorization(request_rec *r,
     int i, rv;
     const char *w;
     apr_array_header_t *groups = NULL;
+
+    const char *err = NULL;
+    const ap_expr_info_t *expr = parsed_require_args;
+    const char *require;
+
     const char *t;
     authz_dbd_cfg *cfg = ap_get_module_config(r->per_dir_config,
                                               &authz_dbd_module);
@@ -269,7 +274,15 @@ static authz_status dbdgroup_check_authorization(request_rec *r,
         }
     }
 
-    t = require_args;
+    require = ap_expr_str_exec(r, expr, &err);
+    if (err) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02590)
+                      "authz_dbd authorize: require dbd-group: Can't "
+                      "evaluate require expression: %s", err);
+        return AUTHZ_DENIED;
+    }
+
+    t = require;
     while (t[0]) {
         w = ap_getword_white(r->pool, &t);
         for (i=0; i < groups->nelts; ++i) {
@@ -310,10 +323,29 @@ static authz_status dbdlogout_check_authorization(request_rec *r,
     return (authz_dbd_login(r, cfg, "logout") == OK ? AUTHZ_GRANTED : AUTHZ_DENIED);
 }
 
+static const char *dbd_parse_config(cmd_parms *cmd, const char *require_line,
+                                     const void **parsed_require_line)
+{
+    const char *expr_err = NULL;
+    ap_expr_info_t *expr = apr_pcalloc(cmd->pool, sizeof(*expr));
+
+    expr = ap_expr_parse_cmd(cmd, require_line, AP_EXPR_FLAG_STRING_RESULT,
+            &expr_err, NULL);
+
+    if (expr_err)
+        return apr_pstrcat(cmd->temp_pool,
+                           "Cannot parse expression in require line: ",
+                           expr_err, NULL);
+
+    *parsed_require_line = expr;
+
+    return NULL;
+}
+
 static const authz_provider authz_dbdgroup_provider =
 {
     &dbdgroup_check_authorization,
-    NULL,
+    dbd_parse_config,
 };
 
 static const authz_provider authz_dbdlogin_provider =
-- 
2.40.0