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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 <sstream>
#include <string>
#include <string_view>
#include <vector>
#include "include/types.h"
#include "common/debug.h"
// unix-style capabilities
enum {
MAY_READ = (1 << 0),
MAY_WRITE = (1 << 1),
MAY_EXECUTE = (1 << 2),
MAY_CHOWN = (1 << 4),
MAY_CHGRP = (1 << 5),
MAY_SET_VXATTR = (1 << 6),
MAY_SNAPSHOT = (1 << 7),
};
class CephContext;
// what we can do
struct MDSCapSpec {
static const unsigned ALL = (1 << 0);
static const unsigned READ = (1 << 1);
static const unsigned WRITE = (1 << 2);
// if the capability permits setting vxattrs (layout, quota, etc)
static const unsigned SET_VXATTR = (1 << 3);
// if the capability permits mksnap/rmsnap
static const unsigned SNAPSHOT = (1 << 4);
static const unsigned RW = (READ|WRITE);
static const unsigned RWP = (READ|WRITE|SET_VXATTR);
static const unsigned RWS = (READ|WRITE|SNAPSHOT);
static const unsigned RWPS = (READ|WRITE|SET_VXATTR|SNAPSHOT);
MDSCapSpec() = default;
MDSCapSpec(unsigned _caps) : caps(_caps) {
if (caps & ALL)
caps |= RWPS;
}
bool allow_all() const {
return (caps & ALL);
}
bool allow_read() const {
return (caps & READ);
}
bool allow_write() const {
return (caps & WRITE);
}
bool allows(bool r, bool w) const {
if (allow_all())
return true;
if (r && !allow_read())
return false;
if (w && !allow_write())
return false;
return true;
}
bool allow_snapshot() const {
return (caps & SNAPSHOT);
}
bool allow_set_vxattr() const {
return (caps & SET_VXATTR);
}
private:
unsigned caps = 0;
};
// 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(const std::string &path_)
: uid(MDS_AUTH_UID_ANY), path(path_) {
normalize_path();
}
MDSCapMatch(const 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(std::string_view 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(std::string_view target_path) const;
};
struct MDSCapGrant {
MDSCapSpec spec;
MDSCapMatch match;
std::string network;
entity_addr_t network_parsed;
unsigned network_prefix = 0;
bool network_valid = true;
MDSCapGrant(const MDSCapSpec &spec_, const MDSCapMatch &match_,
boost::optional<std::string> n)
: spec(spec_), match(match_) {
if (n) {
network = *n;
parse_network();
}
}
MDSCapGrant() {}
void parse_network();
};
class MDSAuthCaps
{
CephContext *cct = nullptr;
std::vector<MDSCapGrant> grants;
public:
MDSAuthCaps() = default;
explicit MDSAuthCaps(CephContext *cct_) : cct(cct_) {}
// this ctor is used by spirit/phoenix; doesn't need cct.
explicit MDSAuthCaps(const std::vector<MDSCapGrant>& grants_) : grants(grants_) {}
void clear() {
grants.clear();
}
void set_allow_all();
bool parse(CephContext *cct, std::string_view str, std::ostream *err);
bool allow_all() const;
bool is_capable(std::string_view 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 entity_addr_t& addr) const;
bool path_capable(std::string_view 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
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