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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/auth/role_graph.h"
#include <algorithm>
#include <set>
#include <vector>
#include "mongo/bson/mutable/document.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/auth/role_name.h"
#include "mongo/stdx/unordered_set.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace {
PrivilegeVector emptyPrivilegeVector;
} // namespace
void RoleGraph::swap(RoleGraph& other) {
using std::swap;
swap(this->_roleToSubordinates, other._roleToSubordinates);
swap(this->_roleToIndirectSubordinates, other._roleToIndirectSubordinates);
swap(this->_roleToMembers, other._roleToMembers);
swap(this->_directPrivilegesForRole, other._directPrivilegesForRole);
swap(this->_allPrivilegesForRole, other._allPrivilegesForRole);
swap(this->_directRestrictionsForRole, other._directRestrictionsForRole);
swap(this->_allRestrictionsForRole, other._allRestrictionsForRole);
swap(this->_allRoles, other._allRoles);
}
bool RoleGraph::roleExists(const RoleName& role) {
_createBuiltinRoleIfNeeded(role);
return _roleExistsDontCreateBuiltin(role);
}
bool RoleGraph::_roleExistsDontCreateBuiltin(const RoleName& role) {
EdgeSet::const_iterator edgeIt = _roleToSubordinates.find(role);
if (edgeIt == _roleToSubordinates.end())
return false;
edgeIt = _roleToMembers.find(role);
fassert(16825, edgeIt != _roleToMembers.end());
RolePrivilegeMap::const_iterator strIt = _directPrivilegesForRole.find(role);
if (strIt == _directPrivilegesForRole.end())
return false;
strIt = _allPrivilegesForRole.find(role);
fassert(16826, strIt != _allPrivilegesForRole.end());
return true;
}
Status RoleGraph::createRole(const RoleName& role) {
if (roleExists(role)) {
return Status(ErrorCodes::Error(51007),
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " already exists");
}
_createRoleDontCheckIfRoleExists(role);
return Status::OK();
}
void RoleGraph::_createRoleDontCheckIfRoleExists(const RoleName& role) {
// Just reference the role in all the maps so that an entry gets created with empty
// containers for the value.
_roleToSubordinates[role];
_roleToIndirectSubordinates[role];
_roleToMembers[role];
_directPrivilegesForRole[role];
_allPrivilegesForRole[role];
_allRoles.insert(role);
}
Status RoleGraph::deleteRole(const RoleName& role) {
if (!roleExists(role)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not exist");
}
if (isBuiltinRole(role)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot delete built-in role: "
<< role.getFullName());
}
for (std::vector<RoleName>::iterator it = _roleToSubordinates[role].begin();
it != _roleToSubordinates[role].end();
++it) {
_roleToMembers[*it].erase(
std::find(_roleToMembers[*it].begin(), _roleToMembers[*it].end(), role));
}
for (std::vector<RoleName>::iterator it = _roleToMembers[role].begin();
it != _roleToMembers[role].end();
++it) {
_roleToSubordinates[*it].erase(
std::find(_roleToSubordinates[*it].begin(), _roleToSubordinates[*it].end(), role));
}
_roleToSubordinates.erase(role);
_roleToIndirectSubordinates.erase(role);
_roleToMembers.erase(role);
_directPrivilegesForRole.erase(role);
_allPrivilegesForRole.erase(role);
_allRoles.erase(role);
return Status::OK();
}
RoleNameIterator RoleGraph::getDirectSubordinates(const RoleName& role) {
if (!roleExists(role))
return RoleNameIterator(NULL);
return makeRoleNameIteratorForContainer(_roleToSubordinates[role]);
}
RoleNameIterator RoleGraph::getIndirectSubordinates(const RoleName& role) {
if (!roleExists(role))
return RoleNameIterator(NULL);
return makeRoleNameIteratorForContainer(_roleToIndirectSubordinates[role]);
}
RoleNameIterator RoleGraph::getDirectMembers(const RoleName& role) {
if (!roleExists(role))
return RoleNameIterator(NULL);
return makeRoleNameIteratorForContainer(_roleToMembers[role]);
}
const PrivilegeVector& RoleGraph::getDirectPrivileges(const RoleName& role) {
if (!roleExists(role))
return emptyPrivilegeVector;
return _directPrivilegesForRole.find(role)->second;
}
const PrivilegeVector& RoleGraph::getAllPrivileges(const RoleName& role) {
if (!roleExists(role))
return emptyPrivilegeVector;
return _allPrivilegesForRole.find(role)->second;
}
Status RoleGraph::addRoleToRole(const RoleName& recipient, const RoleName& role) {
if (!roleExists(recipient)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << recipient.getFullName()
<< " does not exist");
}
if (isBuiltinRole(recipient)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot grant roles to built-in role: "
<< role.getFullName());
}
if (!roleExists(role)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not exist");
}
if (std::find(_roleToSubordinates[recipient].begin(),
_roleToSubordinates[recipient].end(),
role) == _roleToSubordinates[recipient].end()) {
// Only add role if it's not already present
_roleToSubordinates[recipient].push_back(role);
_roleToMembers[role].push_back(recipient);
}
return Status::OK();
}
Status RoleGraph::removeRoleFromRole(const RoleName& recipient, const RoleName& role) {
if (!roleExists(recipient)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << recipient.getFullName()
<< " does not exist");
}
if (isBuiltinRole(recipient)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot remove roles from built-in role: "
<< role.getFullName());
}
if (!roleExists(role)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not exist");
}
std::vector<RoleName>::iterator itToRm =
std::find(_roleToMembers[role].begin(), _roleToMembers[role].end(), recipient);
if (itToRm != _roleToMembers[role].end()) {
_roleToMembers[role].erase(itToRm);
} else {
return Status(ErrorCodes::RolesNotRelated,
mongoutils::str::stream() << recipient.getFullName() << " is not a member"
" of "
<< role.getFullName());
}
itToRm = std::find(
_roleToSubordinates[recipient].begin(), _roleToSubordinates[recipient].end(), role);
fassert(16827, itToRm != _roleToSubordinates[recipient].end());
_roleToSubordinates[recipient].erase(itToRm);
return Status::OK();
}
Status RoleGraph::removeAllRolesFromRole(const RoleName& victim) {
typedef std::vector<RoleName> RoleNameVector;
if (!roleExists(victim)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << victim.getFullName()
<< " does not exist");
}
if (isBuiltinRole(victim)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot remove roles from built-in role: "
<< victim.getFullName());
}
RoleNameVector& subordinatesOfVictim = _roleToSubordinates[victim];
for (RoleNameVector::const_iterator subordinateRole = subordinatesOfVictim.begin(),
end = subordinatesOfVictim.end();
subordinateRole != end;
++subordinateRole) {
RoleNameVector& membersOfSubordinate = _roleToMembers[*subordinateRole];
RoleNameVector::iterator toErase =
std::find(membersOfSubordinate.begin(), membersOfSubordinate.end(), victim);
fassert(17173, toErase != membersOfSubordinate.end());
membersOfSubordinate.erase(toErase);
}
subordinatesOfVictim.clear();
return Status::OK();
}
Status RoleGraph::addPrivilegeToRole(const RoleName& role, const Privilege& privilegeToAdd) {
if (!roleExists(role)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not exist");
}
if (isBuiltinRole(role)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot grant privileges to built-in role: "
<< role.getFullName());
}
_addPrivilegeToRoleNoChecks(role, privilegeToAdd);
return Status::OK();
}
void RoleGraph::_addPrivilegeToRoleNoChecks(const RoleName& role, const Privilege& privilegeToAdd) {
Privilege::addPrivilegeToPrivilegeVector(&_directPrivilegesForRole[role], privilegeToAdd);
}
// NOTE: Current runtime of this is O(n*m) where n is the size of the current PrivilegeVector
// for the given role, and m is the size of the privilegesToAdd vector.
// If this was a PrivilegeSet (sorted on resource) rather than a PrivilegeVector, we
// could do this in O(n+m) instead.
Status RoleGraph::addPrivilegesToRole(const RoleName& role,
const PrivilegeVector& privilegesToAdd) {
if (!roleExists(role)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not exist");
}
if (isBuiltinRole(role)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot grant privileges to built-in role: "
<< role.getFullName());
}
for (PrivilegeVector::const_iterator it = privilegesToAdd.begin(); it != privilegesToAdd.end();
++it) {
_addPrivilegeToRoleNoChecks(role, *it);
}
return Status::OK();
}
Status RoleGraph::removePrivilegeFromRole(const RoleName& role,
const Privilege& privilegeToRemove) {
if (!roleExists(role)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not exist");
}
if (isBuiltinRole(role)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot remove privileges from built-in role: "
<< role.getFullName());
}
PrivilegeVector& currentPrivileges = _directPrivilegesForRole[role];
for (PrivilegeVector::iterator it = currentPrivileges.begin(); it != currentPrivileges.end();
++it) {
Privilege& curPrivilege = *it;
if (curPrivilege.getResourcePattern() == privilegeToRemove.getResourcePattern()) {
ActionSet curActions = curPrivilege.getActions();
if (!curActions.isSupersetOf(privilegeToRemove.getActions())) {
// Didn't possess all the actions being removed.
return Status(
ErrorCodes::PrivilegeNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not contain a privilege on "
<< privilegeToRemove.getResourcePattern().toString()
<< " with actions: "
<< privilegeToRemove.getActions().toString());
}
curPrivilege.removeActions(privilegeToRemove.getActions());
if (curPrivilege.getActions().empty()) {
currentPrivileges.erase(it);
}
return Status::OK();
}
}
return Status(ErrorCodes::PrivilegeNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not "
"contain any privileges on "
<< privilegeToRemove.getResourcePattern().toString());
}
Status RoleGraph::removePrivilegesFromRole(const RoleName& role,
const PrivilegeVector& privilegesToRemove) {
for (PrivilegeVector::const_iterator it = privilegesToRemove.begin();
it != privilegesToRemove.end();
++it) {
Status status = removePrivilegeFromRole(role, *it);
if (!status.isOK()) {
return status;
}
}
return Status::OK();
}
Status RoleGraph::removeAllPrivilegesFromRole(const RoleName& role) {
if (!roleExists(role)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not exist");
}
if (isBuiltinRole(role)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot remove privileges from built-in role: "
<< role.getFullName());
}
_directPrivilegesForRole[role].clear();
return Status::OK();
}
Status RoleGraph::replaceRestrictionsForRole(const RoleName& role,
SharedRestrictionDocument restrictions) {
if (!roleExists(role)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << role.getFullName()
<< " does not exist");
}
if (isBuiltinRole(role)) {
return Status(ErrorCodes::InvalidRoleModification,
mongoutils::str::stream() << "Cannot remove restrictions from built-in role: "
<< role.getFullName());
}
_directRestrictionsForRole[role] = std::move(restrictions);
return Status::OK();
}
Status RoleGraph::replaceRole(const RoleName& roleName,
const std::vector<RoleName>& roles,
const PrivilegeVector& privileges,
SharedRestrictionDocument restrictions) {
Status status = removeAllPrivilegesFromRole(roleName);
if (status == ErrorCodes::RoleNotFound) {
fassert(17168, createRole(roleName));
} else if (!status.isOK()) {
return status;
}
fassert(17169, removeAllRolesFromRole(roleName));
fassert(40556, replaceRestrictionsForRole(roleName, restrictions));
for (size_t i = 0; i < roles.size(); ++i) {
const RoleName& grantedRole = roles[i];
status = createRole(grantedRole);
fassert(17170, status.isOK() || status.code() == 51007);
fassert(17171, addRoleToRole(roleName, grantedRole));
}
fassert(17172, addPrivilegesToRole(roleName, privileges));
return Status::OK();
}
Status RoleGraph::recomputePrivilegeData() {
/*
* This method is used to recompute the "allPrivileges" vector for each node in the graph,
* as well as look for cycles. It is implemented by performing a depth-first traversal of
* the dependency graph, once for each node. "visitedRoles" tracks the set of role names
* ever visited, and it is used to prune each DFS. A node that has been visited once on any
* DFS is never visited again. Complexity of this implementation is O(n+m) where "n" is the
* number of nodes and "m" is the number of prerequisite edges. Space complexity is O(n),
* in both stack space and size of the "visitedRoles" set.
*
* "inProgressRoles" is used to detect and report cycles, as well as to keep track of roles
* we started visiting before realizing they had children that needed visiting first, so
* we can get back to them after visiting their children.
*/
stdx::unordered_set<RoleName> visitedRoles;
for (EdgeSet::const_iterator it = _roleToSubordinates.begin(); it != _roleToSubordinates.end();
++it) {
Status status = _recomputePrivilegeDataHelper(it->first, visitedRoles);
if (!status.isOK()) {
return status;
}
}
return Status::OK();
}
Status RoleGraph::_recomputePrivilegeDataHelper(const RoleName& startingRole,
stdx::unordered_set<RoleName>& visitedRoles) {
if (visitedRoles.count(startingRole)) {
return Status::OK();
}
std::vector<RoleName> inProgressRoles;
inProgressRoles.push_back(startingRole);
while (inProgressRoles.size()) {
const RoleName currentRole = inProgressRoles.back();
fassert(17277, !visitedRoles.count(currentRole));
if (!roleExists(currentRole)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << "Role: " << currentRole.getFullName()
<< " does not exist");
}
// Check for cycles
{
const std::vector<RoleName>::const_iterator begin = inProgressRoles.begin();
// The currentRole will always be last so don't look there.
const std::vector<RoleName>::const_iterator end = --inProgressRoles.end();
const std::vector<RoleName>::const_iterator firstOccurence =
std::find(begin, end, currentRole);
if (firstOccurence != end) {
std::ostringstream os;
os << "Cycle in dependency graph: ";
for (std::vector<RoleName>::const_iterator it = firstOccurence; it != end; ++it) {
os << it->getFullName() << " -> ";
}
os << currentRole.getFullName();
return Status(ErrorCodes::GraphContainsCycle, os.str());
}
}
// Make sure we've already visited all subordinate roles before worrying about this one.
const std::vector<RoleName>& currentRoleDirectRoles = _roleToSubordinates[currentRole];
std::vector<RoleName>::const_iterator roleIt;
for (roleIt = currentRoleDirectRoles.begin(); roleIt != currentRoleDirectRoles.end();
++roleIt) {
const RoleName& childRole = *roleIt;
if (!visitedRoles.count(childRole)) {
inProgressRoles.push_back(childRole);
break;
}
}
// If roleIt didn't reach the end of currentRoleDirectRoles that means we found a child
// of currentRole that we haven't visited yet.
if (roleIt != currentRoleDirectRoles.end()) {
continue;
}
// At this point, we know that we've already visited all child roles of currentRole
// and thus their "all privileges" sets are correct and can be added to currentRole's
// "all privileges" set
// Need to clear out the "all privileges" vector for the current role, and re-fill it
// with just the direct privileges for this role.
PrivilegeVector& currentRoleAllPrivileges = _allPrivilegesForRole[currentRole];
currentRoleAllPrivileges = _directPrivilegesForRole[currentRole];
// Need to do the same thing for the indirect roles
stdx::unordered_set<RoleName>& currentRoleIndirectRoles =
_roleToIndirectSubordinates[currentRole];
currentRoleIndirectRoles.clear();
for (const auto& role : currentRoleDirectRoles) {
currentRoleIndirectRoles.insert(role);
}
// Also clear the "all restrictions" to rebuild in loop
auto& currentRoleAllRestrictions = _allRestrictionsForRole[currentRole];
currentRoleAllRestrictions.clear();
auto& currentRoleDirectRestrictions = _directRestrictionsForRole[currentRole];
if (currentRoleDirectRestrictions) {
currentRoleAllRestrictions.push_back(currentRoleDirectRestrictions);
}
// Recursively add children's privileges to current role's "all privileges" vector, and
// children's roles to current roles's "indirect roles" vector.
for (const auto& childRole : currentRoleDirectRoles) {
// At this point, we already know that the "all privilege" set for the child is
// correct, so add those privileges to our "all privilege" set.
for (const auto& priv : _allPrivilegesForRole[childRole]) {
Privilege::addPrivilegeToPrivilegeVector(¤tRoleAllPrivileges, priv);
}
// We also know that the "indirect roles" for the child is also correct, so we can
// add those roles to our "indirect roles" set.
const auto& childAllRolesToIndirectSubordinates =
_roleToIndirectSubordinates[childRole];
currentRoleIndirectRoles.insert(childAllRolesToIndirectSubordinates.begin(),
childAllRolesToIndirectSubordinates.end());
// Similarly, "indirect restrictions" are ready to append
const auto& childAllRestrictionsForRole = _allRestrictionsForRole[childRole];
currentRoleAllRestrictions.insert(currentRoleAllRestrictions.end(),
childAllRestrictionsForRole.begin(),
childAllRestrictionsForRole.end());
}
visitedRoles.insert(currentRole);
inProgressRoles.pop_back();
}
return Status::OK();
}
RoleNameIterator RoleGraph::getRolesForDatabase(StringData dbname) {
_createBuiltinRolesForDBIfNeeded(dbname);
std::set<RoleName>::const_iterator lower =
_allRoles.lower_bound(RoleName("", dbname.toString()));
std::string afterDB = dbname.toString();
afterDB.push_back('\0');
std::set<RoleName>::const_iterator upper = _allRoles.lower_bound(RoleName("", afterDB));
return makeRoleNameIterator(lower, upper);
}
Status RoleGraph::getBSONForRole(RoleGraph* graph,
const RoleName& roleName,
mutablebson::Element result) try {
if (!graph->roleExists(roleName)) {
return Status(ErrorCodes::RoleNotFound,
mongoutils::str::stream() << roleName.getFullName()
<< "does not name an existing role");
}
std::string id = mongoutils::str::stream() << roleName.getDB() << "." << roleName.getRole();
uassertStatusOK(result.appendString("_id", id));
uassertStatusOK(
result.appendString(AuthorizationManager::ROLE_NAME_FIELD_NAME, roleName.getRole()));
uassertStatusOK(
result.appendString(AuthorizationManager::ROLE_DB_FIELD_NAME, roleName.getDB()));
// Build privileges array
mutablebson::Element privilegesArrayElement =
result.getDocument().makeElementArray("privileges");
uassertStatusOK(result.pushBack(privilegesArrayElement));
const PrivilegeVector& privileges = graph->getDirectPrivileges(roleName);
uassertStatusOK(Privilege::getBSONForPrivileges(privileges, privilegesArrayElement));
// Build roles array
mutablebson::Element rolesArrayElement = result.getDocument().makeElementArray("roles");
uassertStatusOK(result.pushBack(rolesArrayElement));
for (RoleNameIterator roles = graph->getDirectSubordinates(roleName); roles.more();
roles.next()) {
const RoleName& subRole = roles.get();
mutablebson::Element roleObj = result.getDocument().makeElementObject("");
uassertStatusOK(
roleObj.appendString(AuthorizationManager::ROLE_NAME_FIELD_NAME, subRole.getRole()));
uassertStatusOK(
roleObj.appendString(AuthorizationManager::ROLE_DB_FIELD_NAME, subRole.getDB()));
uassertStatusOK(rolesArrayElement.pushBack(roleObj));
}
return Status::OK();
} catch (...) {
return exceptionToStatus();
}
} // namespace mongo
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