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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "Permission.hxx"
#include "config/Param.hxx"
#include "config/Data.hxx"
#include "config/Option.hxx"
#include "util/IterableSplitString.hxx"
#include "util/RuntimeError.hxx"
#include "util/StringView.hxx"
#include <cassert>
#include <cstring>
#include <map>
#include <string>
#include <utility>
static constexpr char PERMISSION_PASSWORD_CHAR = '@';
static constexpr char PERMISSION_SEPARATOR = ',';
static constexpr struct {
const char *name;
unsigned value;
} permission_names[] = {
{ "read", PERMISSION_READ },
{ "add", PERMISSION_ADD },
{ "control", PERMISSION_CONTROL },
{ "admin", PERMISSION_ADMIN },
{ nullptr, 0 },
};
static std::map<std::string, unsigned> permission_passwords;
static unsigned permission_default;
#ifdef HAVE_UN
static unsigned local_permissions;
#endif
static unsigned
ParsePermission(StringView s)
{
for (auto i = permission_names; i->name != nullptr; ++i)
if (s.Equals(i->name))
return i->value;
throw FormatRuntimeError("unknown permission \"%.*s\"",
int(s.size), s.data);
}
static unsigned parsePermissions(const char *string)
{
assert(string != nullptr);
unsigned permission = 0;
for (const auto i : IterableSplitString(string, PERMISSION_SEPARATOR))
if (!i.empty())
permission |= ParsePermission(i);
return permission;
}
void
initPermissions(const ConfigData &config)
{
permission_default = PERMISSION_READ | PERMISSION_ADD |
PERMISSION_CONTROL | PERMISSION_ADMIN;
for (const auto ¶m : config.GetParamList(ConfigOption::PASSWORD)) {
permission_default = 0;
param.With([](const char *value){
const char *separator = std::strchr(value,
PERMISSION_PASSWORD_CHAR);
if (separator == nullptr)
throw FormatRuntimeError("\"%c\" not found in password string",
PERMISSION_PASSWORD_CHAR);
std::string password(value, separator);
unsigned permission = parsePermissions(separator + 1);
permission_passwords.insert(std::make_pair(std::move(password),
permission));
});
}
config.With(ConfigOption::DEFAULT_PERMS, [](const char *value){
if (value != nullptr)
permission_default = parsePermissions(value);
});
#ifdef HAVE_UN
local_permissions = config.With(ConfigOption::LOCAL_PERMISSIONS, [](const char *value){
return value != nullptr
? parsePermissions(value)
: permission_default;
});
#endif
}
int
getPermissionFromPassword(const char *password, unsigned *permission) noexcept
{
auto i = permission_passwords.find(password);
if (i == permission_passwords.end())
return -1;
*permission = i->second;
return 0;
}
unsigned
getDefaultPermissions() noexcept
{
return permission_default;
}
#ifdef HAVE_UN
unsigned
GetLocalPermissions() noexcept
{
return local_permissions;
}
#endif
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