From be8ea07e55ee20d1d4e8d4ac10473c692d393ae3 Mon Sep 17 00:00:00 2001
From: Graham Leggett <minfrin@apache.org>
Date: Mon, 30 Dec 2013 11:14:19 +0000
Subject: [PATCH] mod_authnz_host: Support the expression parser within the
 require directives.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1554188 13f79535-47bb-0310-9956-ffa450edef68
---
 CHANGES                            |  3 +++
 docs/log-message-tags/next-number  |  2 +-
 docs/manual/expr.xml               |  2 ++
 docs/manual/mod/mod_authz_host.xml |  7 +++++-
 modules/aaa/mod_authz_host.c       | 35 ++++++++++++++++++++++++++++--
 5 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/CHANGES b/CHANGES
index 97359ef882..dde3b17912 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,9 @@
                                                          -*- coding: utf-8 -*-
 Changes with Apache 2.5.0
 
+  *) mod_authnz_host: Support the expression parser within the require
+     directives. [Graham Leggett]
+
   *) mod_authnz_groupfile: 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 697eb4b355..76e69c8879 100644
--- a/docs/log-message-tags/next-number
+++ b/docs/log-message-tags/next-number
@@ -1 +1 @@
-2593
+2594
diff --git a/docs/manual/expr.xml b/docs/manual/expr.xml
index 13a99d2b43..2fa607915f 100644
--- a/docs/manual/expr.xml
+++ b/docs/manual/expr.xml
@@ -58,6 +58,8 @@
 <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><a href="mod/mod_authz_dbm.html#reqgroup">Require dbm-group</a></seealso>
+<seealso><a href="mod/mod_authz_groupfile.html#reqgroup">Require group</a></seealso>
+<seealso><a href="mod/mod_authz_host.html#reqhost">Require host</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_host.xml b/docs/manual/mod/mod_authz_host.xml
index 1e16661ac3..69ecf3b862 100644
--- a/docs/manual/mod/mod_authz_host.xml
+++ b/docs/manual/mod/mod_authz_host.xml
@@ -58,7 +58,7 @@ address)</description>
     <p>Apache's <directive module="mod_authz_core">Require</directive>
     directive is used during the authorization phase to ensure that a user is allowed or
     denied access to a resource.  mod_authz_host extends the
-    authorization types with <code>ip</code> and <code>host</code>.
+    authorization types with <code>ip</code>, <code>host</code> and <code>local</code>.
     Other authorization types may also be
     used but may require that additional authorization modules be loaded.</p>
 
@@ -66,6 +66,9 @@ address)</description>
     access an area of the server. Access can be controlled by
     hostname, IP Address, or IP Address range.</p>
 
+    <p>Since v2.5.0, <a href="../expr.html">expressions</a> are supported
+    within the host require directives.</p>
+
 <section id="reqip"><title>Require ip</title>
 
     <p>The <code>ip</code> provider allows access to the server
@@ -118,6 +121,8 @@ Require ip 2001:db8::a00:20ff:fea7:ccea
 Require ip 2001:db8::a00:20ff:fea7:ccea/10
     </highlight>
 
+    <p>Note: As the IP addresses are parsed on startup, expressions are
+    not evaluated at request time.</p>
 
 </section>
 
diff --git a/modules/aaa/mod_authz_host.c b/modules/aaa/mod_authz_host.c
index f4d5c41cb8..f5f1a0ddbc 100644
--- a/modules/aaa/mod_authz_host.c
+++ b/modules/aaa/mod_authz_host.c
@@ -179,10 +179,22 @@ static authz_status host_check_authorization(request_rec *r,
                       "remote host name", require_line, r->uri);
     }
     else {
+        const char *err = NULL;
+        const ap_expr_info_t *expr = parsed_require_line;
+        const char *require;
+
+        require = ap_expr_str_exec(r, expr, &err);
+        if (err) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02593)
+                          "authz_host authorize: require host: Can't "
+                          "evaluate require expression: %s", err);
+            return AUTHZ_DENIED;
+        }
+
         /* The 'host' provider will allow the configuration to specify a list of
             host names to check rather than a single name.  This is different
             from the previous host based syntax. */
-        t = require_line;
+        t = require;
         while ((w = ap_getword_conf(r->pool, &t)) && w[0]) {
             if (in_domain(w, remotehost)) {
                 return AUTHZ_GRANTED;
@@ -212,6 +224,25 @@ static authz_status local_check_authorization(request_rec *r,
      return AUTHZ_DENIED;
 }
 
+static const char *host_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_ip_provider =
 {
     &ip_check_authorization,
@@ -221,7 +252,7 @@ static const authz_provider authz_ip_provider =
 static const authz_provider authz_host_provider =
 {
     &host_check_authorization,
-    NULL,
+    &host_parse_config,
 };
 
 static const authz_provider authz_local_provider =
-- 
2.40.0