Core: ngx_conf_set_access_slot() user access (ticket #1096).

Previously, user access bits were always set to "rw" unconditionally,
even with "user:r" explicitly specified.  With this change we only add
default user access bits (0600) if they weren't set explicitly.

src/core/ngx_file.c

@@ -441,7 +441,7 @@ ngx_conf_set_access_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 
     u_char      *p;
     ngx_str_t   *value;
-    ngx_uint_t   i, right, shift, *access;
+    ngx_uint_t   i, right, shift, *access, user;
 
     access = (ngx_uint_t *) (confp + cmd->offset);
 
@@ -451,7 +451,8 @@ ngx_conf_set_access_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 
     value = cf->args->elts;
 
-    *access = 0600;
+    *access = 0;
+    user = 0600;
 
     for (i = 1; i < cf->args->nelts; i++) {
 
@@ -460,6 +461,7 @@ ngx_conf_set_access_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
         if (ngx_strncmp(p, "user:", sizeof("user:") - 1) == 0) {
             shift = 6;
             p += sizeof("user:") - 1;
+            user = 0;
 
         } else if (ngx_strncmp(p, "group:", sizeof("group:") - 1) == 0) {
             shift = 3;
@@ -486,6 +488,8 @@ ngx_conf_set_access_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
         *access |= right << shift;
     }
 
+    *access |= user;
+
     return NGX_CONF_OK;
 
 invalid: