Adding upstream version 2.4.38.upstream/2.4.38upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 189 insertions, 0 deletions

diff --git a/modules/aaa/mod_authz_owner.c b/modules/aaa/mod_authz_owner.c
new file mode 100644
index 0000000..4fd0b2a
--- /dev/null
+++ b/modules/aaa/mod_authz_owner.c
@@ -0,0 +1,189 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_strings.h"
+#include "apr_file_info.h"
+#include "apr_user.h"
+
+#include "ap_config.h"
+#include "ap_provider.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "http_core.h"
+#include "http_log.h"
+#include "http_protocol.h"
+#include "http_request.h"
+
+#include "mod_auth.h"
+#include "mod_authz_owner.h"
+
+static const command_rec authz_owner_cmds[] =
+{
+    {NULL}
+};
+
+module AP_MODULE_DECLARE_DATA authz_owner_module;
+
+static authz_status fileowner_check_authorization(request_rec *r,
+                                                  const char *require_args,
+                                                  const void *parsed_require_args)
+{
+    char *reason = NULL;
+    apr_status_t status = 0;
+
+#if !APR_HAS_USER
+    reason = "'Require file-owner' is not supported on this platform.";
+    ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01632)
+                  "Authorization of user %s to access %s failed, reason: %s",
+                  r->user, r->uri, reason ? reason : "unknown");
+    return AUTHZ_DENIED;
+#else  /* APR_HAS_USER */
+    char *owner = NULL;
+    apr_finfo_t finfo;
+
+    if (!r->user) {
+        return AUTHZ_DENIED_NO_USER;
+    }
+
+    if (!r->filename) {
+        reason = "no filename available";
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01633)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return AUTHZ_DENIED;
+    }
+
+    status = apr_stat(&finfo, r->filename, APR_FINFO_USER, r->pool);
+    if (status != APR_SUCCESS) {
+        reason = apr_pstrcat(r->pool, "could not stat file ",
+                                r->filename, NULL);
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01634)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return AUTHZ_DENIED;
+    }
+
+    if (!(finfo.valid & APR_FINFO_USER)) {
+        reason = "no file owner information available";
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01635)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return AUTHZ_DENIED;
+    }
+
+    status = apr_uid_name_get(&owner, finfo.user, r->pool);
+    if (status != APR_SUCCESS || !owner) {
+        reason = "could not get name of file owner";
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01636)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return AUTHZ_DENIED;
+    }
+
+    if (strcmp(owner, r->user)) {
+        reason = apr_psprintf(r->pool, "file owner %s does not match.",
+                                owner);
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01637)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return AUTHZ_DENIED;
+    }
+
+    /* this user is authorized */
+    return AUTHZ_GRANTED;
+#endif /* APR_HAS_USER */
+}
+
+static char *authz_owner_get_file_group(request_rec *r)
+{
+    /* file-group only figures out the file's group and lets
+    * other modules do the actual authorization (against a group file/db).
+    * Thus, these modules have to hook themselves after
+    * mod_authz_owner and of course recognize 'file-group', too.
+    */
+#if !APR_HAS_USER
+    return NULL;
+#else  /* APR_HAS_USER */
+    char *reason = NULL;
+    char *group = NULL;
+    apr_finfo_t finfo;
+    apr_status_t status = 0;
+
+    if (!r->filename) {
+        reason = "no filename available";
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01638)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return NULL;
+    }
+
+    status = apr_stat(&finfo, r->filename, APR_FINFO_GROUP, r->pool);
+    if (status != APR_SUCCESS) {
+        reason = apr_pstrcat(r->pool, "could not stat file ",
+                                r->filename, NULL);
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01639)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return NULL;
+    }
+
+    if (!(finfo.valid & APR_FINFO_GROUP)) {
+        reason = "no file group information available";
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01640)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return NULL;
+    }
+
+    status = apr_gid_name_get(&group, finfo.group, r->pool);
+    if (status != APR_SUCCESS || !group) {
+        reason = "could not get name of file group";
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01641)
+                      "Authorization of user %s to access %s failed, reason: %s",
+                      r->user, r->uri, reason ? reason : "unknown");
+        return NULL;
+    }
+
+    return group;
+#endif /* APR_HAS_USER */
+}
+
+static const authz_provider authz_fileowner_provider =
+{
+    &fileowner_check_authorization,
+    NULL,
+};
+
+static void register_hooks(apr_pool_t *p)
+{
+    APR_REGISTER_OPTIONAL_FN(authz_owner_get_file_group);
+
+    ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "file-owner",
+                              AUTHZ_PROVIDER_VERSION,
+                              &authz_fileowner_provider,
+                              AP_AUTH_INTERNAL_PER_CONF);
+}
+
+AP_DECLARE_MODULE(authz_owner) =
+{
+    STANDARD20_MODULE_STUFF,
+    NULL,                          /* dir config creater */
+    NULL,                          /* dir merger --- default is to override */
+    NULL,                          /* server config */
+    NULL,                          /* merge server config */
+    authz_owner_cmds,              /* command apr_table_t */
+    register_hooks                 /* register hooks */
+};