initial code repo

[stor4nfv.git] / src / ceph / src / mds / MDSAuthCaps.h

diff --git a/src/ceph/src/mds/MDSAuthCaps.h b/src/ceph/src/mds/MDSAuthCaps.h
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+++ b/src/ceph/src/mds/MDSAuthCaps.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef MDS_AUTH_CAPS_H
+#define MDS_AUTH_CAPS_H
+
+#include <vector>
+#include <string>
+#include <sstream>
+#include "include/types.h"
+#include "common/debug.h"
+
+// unix-style capabilities
+enum {
+  MAY_READ = 1,
+  MAY_WRITE = 2,
+  MAY_EXECUTE = 4,
+  MAY_CHOWN = 16,
+  MAY_CHGRP = 32,
+  MAY_SET_VXATTR = 64,
+};
+
+class CephContext;
+
+// what we can do
+struct MDSCapSpec {
+  bool read, write, any;
+
+  // True if the capability permits setting vxattrs (layout, quota, etc)
+  bool set_vxattr;
+
+  MDSCapSpec() : read(false), write(false), any(false), set_vxattr(false) {}
+  MDSCapSpec(bool r, bool w, bool a, bool lop)
+    : read(r), write(w), any(a), set_vxattr(lop) {}
+
+  bool allow_all() const {
+    return any;
+  }
+
+  bool allows(bool r, bool w) const {
+    if (any)
+      return true;
+    if (r && !read)
+      return false;
+    if (w && !write)
+      return false;
+    return true;
+  }
+
+  bool allows_set_vxattr() const {
+    return set_vxattr;
+  }
+};
+
+// conditions before we are allowed to do it
+struct MDSCapMatch {
+  static const int64_t MDS_AUTH_UID_ANY = -1;
+
+  int64_t uid;       // Require UID to be equal to this, if !=MDS_AUTH_UID_ANY
+  std::vector<gid_t> gids;  // Use these GIDs
+  std::string path;  // Require path to be child of this (may be "" or "/" for any)
+
+  MDSCapMatch() : uid(MDS_AUTH_UID_ANY) {}
+  MDSCapMatch(int64_t uid_, std::vector<gid_t>& gids_) : uid(uid_), gids(gids_) {}
+  explicit MDSCapMatch(std::string path_)
+    : uid(MDS_AUTH_UID_ANY), path(path_) {
+    normalize_path();
+  }
+  MDSCapMatch(std::string path_, int64_t uid_, std::vector<gid_t>& gids_)
+    : uid(uid_), gids(gids_), path(path_) {
+    normalize_path();
+  }
+
+  void normalize_path();
+  
+  bool is_match_all() const
+  {
+    return uid == MDS_AUTH_UID_ANY && path == "";
+  }
+
+  // check whether this grant matches against a given file and caller uid:gid
+  bool match(const std::string &target_path,
+            const int caller_uid,
+            const int caller_gid,
+            const vector<uint64_t> *caller_gid_list) const;
+
+  /**
+   * Check whether this path *might* be accessible (actual permission
+   * depends on the stronger check in match()).
+   *
+   * @param target_path filesystem path without leading '/'
+   */
+  bool match_path(const std::string &target_path) const;
+};
+
+struct MDSCapGrant {
+  MDSCapSpec spec;
+  MDSCapMatch match;
+
+  MDSCapGrant(const MDSCapSpec &spec_, const MDSCapMatch &match_)
+    : spec(spec_), match(match_) {}
+  MDSCapGrant() {}
+};
+
+class MDSAuthCaps
+{
+  CephContext *cct;
+  std::vector<MDSCapGrant> grants;
+
+public:
+  explicit MDSAuthCaps(CephContext *cct_=NULL)
+    : cct(cct_) { }
+
+  // this ctor is used by spirit/phoenix; doesn't need cct.
+  explicit MDSAuthCaps(const std::vector<MDSCapGrant> &grants_)
+    : cct(NULL), grants(grants_) { }
+
+  void set_allow_all();
+  bool parse(CephContext *cct, const std::string &str, std::ostream *err);
+
+  bool allow_all() const;
+  bool is_capable(const std::string &inode_path,
+                 uid_t inode_uid, gid_t inode_gid, unsigned inode_mode,
+                 uid_t uid, gid_t gid, const vector<uint64_t> *caller_gid_list,
+                 unsigned mask, uid_t new_uid, gid_t new_gid) const;
+  bool path_capable(const std::string &inode_path) const;
+
+  friend std::ostream &operator<<(std::ostream &out, const MDSAuthCaps &cap);
+};
+
+
+std::ostream &operator<<(std::ostream &out, const MDSCapMatch &match);
+std::ostream &operator<<(std::ostream &out, const MDSCapSpec &spec);
+std::ostream &operator<<(std::ostream &out, const MDSCapGrant &grant);
+std::ostream &operator<<(std::ostream &out, const MDSAuthCaps &cap);
+
+#endif // MDS_AUTH_CAPS_H