Merge pull request #27701 from vitlibar/fix-checking-grant-option-for-grant-with-replace-option

Fix checking GRANT OPTION while executing GRANT with REPLACE OPTION.
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alexey-milovidov 2021-08-16 02:48:54 +03:00 committed by GitHub
commit 2b18223a09
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3 changed files with 277 additions and 150 deletions

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@ -122,6 +122,9 @@ struct AccessRightsElement
class AccessRightsElements : public std::vector<AccessRightsElement>
{
public:
using Base = std::vector<AccessRightsElement>;
using Base::Base;
bool empty() const { return std::all_of(begin(), end(), [](const AccessRightsElement & e) { return e.empty(); }); }
bool sameDatabaseAndTable() const

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@ -22,69 +22,108 @@ namespace ErrorCodes
namespace
{
template <typename T>
void updateFromQueryTemplate(
T & grantee,
/// Extracts access rights elements which are going to be granted or revoked from a query.
void collectAccessRightsElementsToGrantOrRevoke(
const ASTGrantQuery & query,
const std::vector<UUID> & roles_to_grant_or_revoke)
AccessRightsElements & elements_to_grant,
AccessRightsElements & elements_to_revoke)
{
if (!query.is_revoke)
elements_to_grant.clear();
elements_to_revoke.clear();
if (query.is_revoke)
{
if (query.replace_access)
grantee.access = {};
if (query.replace_granted_roles)
grantee.granted_roles = {};
/// REVOKE
elements_to_revoke = query.access_rights_elements;
}
if (!query.access_rights_elements.empty())
else if (query.replace_access)
{
if (query.is_revoke)
grantee.access.revoke(query.access_rights_elements);
else
grantee.access.grant(query.access_rights_elements);
/// GRANT WITH REPLACE OPTION
elements_to_grant = query.access_rights_elements;
elements_to_revoke.emplace_back(AccessType::ALL);
}
if (!roles_to_grant_or_revoke.empty())
else
{
if (query.is_revoke)
{
if (query.admin_option)
grantee.granted_roles.revokeAdminOption(roles_to_grant_or_revoke);
else
grantee.granted_roles.revoke(roles_to_grant_or_revoke);
}
else
{
if (query.admin_option)
grantee.granted_roles.grantWithAdminOption(roles_to_grant_or_revoke);
else
grantee.granted_roles.grant(roles_to_grant_or_revoke);
}
/// GRANT
elements_to_grant = query.access_rights_elements;
}
}
void updateFromQueryImpl(
IAccessEntity & grantee,
/// Extracts roles which are going to be granted or revoked from a query.
void collectRolesToGrantOrRevoke(
const AccessControlManager & access_control,
const ASTGrantQuery & query,
const std::vector<UUID> & roles_to_grant_or_revoke)
std::vector<UUID> & roles_to_grant,
RolesOrUsersSet & roles_to_revoke)
{
if (auto * user = typeid_cast<User *>(&grantee))
updateFromQueryTemplate(*user, query, roles_to_grant_or_revoke);
else if (auto * role = typeid_cast<Role *>(&grantee))
updateFromQueryTemplate(*role, query, roles_to_grant_or_revoke);
roles_to_grant.clear();
roles_to_revoke.clear();
RolesOrUsersSet roles_to_grant_or_revoke;
if (query.roles)
roles_to_grant_or_revoke = RolesOrUsersSet{*query.roles, access_control};
if (query.is_revoke)
{
/// REVOKE
roles_to_revoke = std::move(roles_to_grant_or_revoke);
}
else if (query.replace_granted_roles)
{
/// GRANT WITH REPLACE OPTION
roles_to_grant = roles_to_grant_or_revoke.getMatchingIDs(access_control);
roles_to_revoke = RolesOrUsersSet::AllTag{};
}
else
{
/// GRANT
roles_to_grant = roles_to_grant_or_revoke.getMatchingIDs(access_control);
}
}
void checkGranteeIsAllowed(const ContextAccess & access, const UUID & grantee_id, const IAccessEntity & grantee)
/// Extracts roles which are going to be granted or revoked from a query.
void collectRolesToGrantOrRevoke(
const ASTGrantQuery & query,
std::vector<UUID> & roles_to_grant,
RolesOrUsersSet & roles_to_revoke)
{
auto current_user = access.getUser();
roles_to_grant.clear();
roles_to_revoke.clear();
RolesOrUsersSet roles_to_grant_or_revoke;
if (query.roles)
roles_to_grant_or_revoke = RolesOrUsersSet{*query.roles};
if (query.is_revoke)
{
/// REVOKE
roles_to_revoke = std::move(roles_to_grant_or_revoke);
}
else if (query.replace_granted_roles)
{
/// GRANT WITH REPLACE OPTION
roles_to_grant = roles_to_grant_or_revoke.getMatchingIDs();
roles_to_revoke = RolesOrUsersSet::AllTag{};
}
else
{
/// GRANT
roles_to_grant = roles_to_grant_or_revoke.getMatchingIDs();
}
}
/// Checks if a grantee is allowed for the current user, throws an exception if not.
void checkGranteeIsAllowed(const ContextAccess & current_user_access, const UUID & grantee_id, const IAccessEntity & grantee)
{
auto current_user = current_user_access.getUser();
if (current_user && !current_user->grantees.match(grantee_id))
throw Exception(grantee.outputTypeAndName() + " is not allowed as grantee", ErrorCodes::ACCESS_DENIED);
}
void checkGranteesAreAllowed(const AccessControlManager & access_control, const ContextAccess & access, const std::vector<UUID> & grantee_ids)
/// Checks if grantees are allowed for the current user, throws an exception if not.
void checkGranteesAreAllowed(const AccessControlManager & access_control, const ContextAccess & current_user_access, const std::vector<UUID> & grantee_ids)
{
auto current_user = access.getUser();
auto current_user = current_user_access.getUser();
if (!current_user || (current_user->grantees == RolesOrUsersSet::AllTag{}))
return;
@ -92,36 +131,26 @@ namespace
{
auto entity = access_control.tryRead(id);
if (auto role = typeid_cast<RolePtr>(entity))
checkGranteeIsAllowed(access, id, *role);
checkGranteeIsAllowed(current_user_access, id, *role);
else if (auto user = typeid_cast<UserPtr>(entity))
checkGranteeIsAllowed(access, id, *user);
checkGranteeIsAllowed(current_user_access, id, *user);
}
}
/// Checks if the current user has enough access rights granted with grant option to grant or revoke specified access rights.
void checkGrantOption(
const AccessControlManager & access_control,
const ContextAccess & access,
const ASTGrantQuery & query,
const ContextAccess & current_user_access,
const std::vector<UUID> & grantees_from_query,
bool & need_check_grantees_are_allowed)
bool & need_check_grantees_are_allowed,
const AccessRightsElements & elements_to_grant,
AccessRightsElements & elements_to_revoke)
{
const auto & elements = query.access_rights_elements;
need_check_grantees_are_allowed = true;
if (elements.empty())
{
/// No access rights to grant or revoke.
need_check_grantees_are_allowed = false;
return;
}
/// Check access rights which are going to be granted.
/// To execute the command GRANT the current user needs to have the access granted with GRANT OPTION.
current_user_access.checkGrantOption(elements_to_grant);
if (!query.is_revoke)
{
/// To execute the command GRANT the current user needs to have the access granted with GRANT OPTION.
access.checkGrantOption(elements);
return;
}
if (access.hasGrantOption(elements))
if (current_user_access.hasGrantOption(elements_to_revoke))
{
/// Simple case: the current user has the grant option for all the access rights specified for REVOKE.
return;
@ -141,69 +170,81 @@ namespace
auto entity = access_control.tryRead(id);
if (auto role = typeid_cast<RolePtr>(entity))
{
checkGranteeIsAllowed(access, id, *role);
checkGranteeIsAllowed(current_user_access, id, *role);
all_granted_access.makeUnion(role->access);
}
else if (auto user = typeid_cast<UserPtr>(entity))
{
checkGranteeIsAllowed(access, id, *user);
checkGranteeIsAllowed(current_user_access, id, *user);
all_granted_access.makeUnion(user->access);
}
}
need_check_grantees_are_allowed = false; /// already checked
AccessRights required_access;
if (elements[0].is_partial_revoke)
{
AccessRightsElements non_revoke_elements = elements;
std::for_each(non_revoke_elements.begin(), non_revoke_elements.end(), [&](AccessRightsElement & element) { element.is_partial_revoke = false; });
required_access.grant(non_revoke_elements);
}
else
{
required_access.grant(elements);
}
required_access.makeIntersection(all_granted_access);
if (!elements_to_revoke.empty() && elements_to_revoke[0].is_partial_revoke)
std::for_each(elements_to_revoke.begin(), elements_to_revoke.end(), [&](AccessRightsElement & element) { element.is_partial_revoke = false; });
AccessRights access_to_revoke;
access_to_revoke.grant(elements_to_revoke);
access_to_revoke.makeIntersection(all_granted_access);
for (auto & required_access_element : required_access.getElements())
/// Build more accurate list of elements to revoke, now we use an intesection of the initial list of elements to revoke
/// and all the granted access rights to these grantees.
bool grant_option = !elements_to_revoke.empty() && elements_to_revoke[0].grant_option;
elements_to_revoke.clear();
for (auto & element_to_revoke : access_to_revoke.getElements())
{
if (!required_access_element.is_partial_revoke && (required_access_element.grant_option || !elements[0].grant_option))
access.checkGrantOption(required_access_element);
if (!element_to_revoke.is_partial_revoke && (element_to_revoke.grant_option || !grant_option))
elements_to_revoke.emplace_back(std::move(element_to_revoke));
}
current_user_access.checkGrantOption(elements_to_revoke);
}
std::vector<UUID> getRoleIDsAndCheckAdminOption(
/// Checks if the current user has enough access rights granted with grant option to grant or revoke specified access rights.
/// Also checks if grantees are allowed for the current user.
void checkGrantOptionAndGrantees(
const AccessControlManager & access_control,
const ContextAccess & access,
const ASTGrantQuery & query,
const RolesOrUsersSet & roles_from_query,
const ContextAccess & current_user_access,
const std::vector<UUID> & grantees_from_query,
bool & need_check_grantees_are_allowed)
const AccessRightsElements & elements_to_grant,
AccessRightsElements & elements_to_revoke)
{
need_check_grantees_are_allowed = true;
if (roles_from_query.empty())
{
/// No roles to grant or revoke.
need_check_grantees_are_allowed = false;
return {};
}
bool need_check_grantees_are_allowed = true;
checkGrantOption(
access_control,
current_user_access,
grantees_from_query,
need_check_grantees_are_allowed,
elements_to_grant,
elements_to_revoke);
std::vector<UUID> matching_ids;
if (!query.is_revoke)
{
/// To execute the command GRANT the current user needs to have the roles granted with ADMIN OPTION.
matching_ids = roles_from_query.getMatchingIDs(access_control);
access.checkAdminOption(matching_ids);
return matching_ids;
}
if (need_check_grantees_are_allowed)
checkGranteesAreAllowed(access_control, current_user_access, grantees_from_query);
}
if (!roles_from_query.all)
/// Checks if the current user has enough roles granted with admin option to grant or revoke specified roles.
void checkAdminOption(
const AccessControlManager & access_control,
const ContextAccess & current_user_access,
const std::vector<UUID> & grantees_from_query,
bool & need_check_grantees_are_allowed,
const std::vector<UUID> & roles_to_grant,
RolesOrUsersSet & roles_to_revoke,
bool admin_option)
{
/// Check roles which are going to be granted.
/// To execute the command GRANT the current user needs to have the roles granted with ADMIN OPTION.
current_user_access.checkAdminOption(roles_to_grant);
/// Check roles which are going to be revoked.
std::vector<UUID> roles_to_revoke_ids;
if (!roles_to_revoke.all)
{
matching_ids = roles_from_query.getMatchingIDs();
if (access.hasAdminOption(matching_ids))
roles_to_revoke_ids = roles_to_revoke.getMatchingIDs();
if (current_user_access.hasAdminOption(roles_to_revoke_ids))
{
/// Simple case: the current user has the admin option for all the roles specified for REVOKE.
return matching_ids;
return;
}
}
@ -221,51 +262,109 @@ namespace
auto entity = access_control.tryRead(id);
if (auto role = typeid_cast<RolePtr>(entity))
{
checkGranteeIsAllowed(access, id, *role);
checkGranteeIsAllowed(current_user_access, id, *role);
all_granted_roles.makeUnion(role->granted_roles);
}
else if (auto user = typeid_cast<UserPtr>(entity))
{
checkGranteeIsAllowed(access, id, *user);
checkGranteeIsAllowed(current_user_access, id, *user);
all_granted_roles.makeUnion(user->granted_roles);
}
}
const auto & all_granted_roles_set = admin_option ? all_granted_roles.getGrantedWithAdminOption() : all_granted_roles.getGranted();
need_check_grantees_are_allowed = false; /// already checked
const auto & all_granted_roles_set = query.admin_option ? all_granted_roles.getGrantedWithAdminOption() : all_granted_roles.getGranted();
if (roles_from_query.all)
boost::range::set_difference(all_granted_roles_set, roles_from_query.except_ids, std::back_inserter(matching_ids));
if (roles_to_revoke.all)
boost::range::set_difference(all_granted_roles_set, roles_to_revoke.except_ids, std::back_inserter(roles_to_revoke_ids));
else
boost::range::remove_erase_if(matching_ids, [&](const UUID & id) { return !all_granted_roles_set.count(id); });
access.checkAdminOption(matching_ids);
return matching_ids;
boost::range::remove_erase_if(roles_to_revoke_ids, [&](const UUID & id) { return !all_granted_roles_set.count(id); });
roles_to_revoke = roles_to_revoke_ids;
current_user_access.checkAdminOption(roles_to_revoke_ids);
}
void checkGrantOptionAndGrantees(
/// Checks if the current user has enough roles granted with admin option to grant or revoke specified roles.
/// Also checks if grantees are allowed for the current user.
void checkAdminOptionAndGrantees(
const AccessControlManager & access_control,
const ContextAccess & access,
const ASTGrantQuery & query,
const std::vector<UUID> & grantees_from_query)
const ContextAccess & current_user_access,
const std::vector<UUID> & grantees_from_query,
const std::vector<UUID> & roles_to_grant,
RolesOrUsersSet & roles_to_revoke,
bool admin_option)
{
bool need_check_grantees_are_allowed = true;
checkGrantOption(access_control, access, query, grantees_from_query, need_check_grantees_are_allowed);
checkAdminOption(
access_control,
current_user_access,
grantees_from_query,
need_check_grantees_are_allowed,
roles_to_grant,
roles_to_revoke,
admin_option);
if (need_check_grantees_are_allowed)
checkGranteesAreAllowed(access_control, access, grantees_from_query);
checkGranteesAreAllowed(access_control, current_user_access, grantees_from_query);
}
std::vector<UUID> getRoleIDsAndCheckAdminOptionAndGrantees(
const AccessControlManager & access_control,
const ContextAccess & access,
const ASTGrantQuery & query,
const RolesOrUsersSet & roles_from_query,
const std::vector<UUID> & grantees_from_query)
template <typename T>
void updateGrantedAccessRightsAndRolesTemplate(
T & grantee,
const AccessRightsElements & elements_to_grant,
const AccessRightsElements & elements_to_revoke,
const std::vector<UUID> & roles_to_grant,
const RolesOrUsersSet & roles_to_revoke,
bool admin_option)
{
bool need_check_grantees_are_allowed = true;
auto role_ids = getRoleIDsAndCheckAdminOption(
access_control, access, query, roles_from_query, grantees_from_query, need_check_grantees_are_allowed);
if (need_check_grantees_are_allowed)
checkGranteesAreAllowed(access_control, access, grantees_from_query);
return role_ids;
if (!elements_to_revoke.empty())
grantee.access.revoke(elements_to_revoke);
if (!elements_to_grant.empty())
grantee.access.grant(elements_to_grant);
if (!roles_to_revoke.empty())
{
if (admin_option)
grantee.granted_roles.revokeAdminOption(grantee.granted_roles.findGrantedWithAdminOption(roles_to_revoke));
else
grantee.granted_roles.revoke(grantee.granted_roles.findGranted(roles_to_revoke));
}
if (!roles_to_grant.empty())
{
if (admin_option)
grantee.granted_roles.grantWithAdminOption(roles_to_grant);
else
grantee.granted_roles.grant(roles_to_grant);
}
}
/// Updates grants of a specified user or role.
void updateGrantedAccessRightsAndRoles(
IAccessEntity & grantee,
const AccessRightsElements & elements_to_grant,
const AccessRightsElements & elements_to_revoke,
const std::vector<UUID> & roles_to_grant,
const RolesOrUsersSet & roles_to_revoke,
bool admin_option)
{
if (auto * user = typeid_cast<User *>(&grantee))
updateGrantedAccessRightsAndRolesTemplate(*user, elements_to_grant, elements_to_revoke, roles_to_grant, roles_to_revoke, admin_option);
else if (auto * role = typeid_cast<Role *>(&grantee))
updateGrantedAccessRightsAndRolesTemplate(*role, elements_to_grant, elements_to_revoke, roles_to_grant, roles_to_revoke, admin_option);
}
/// Updates grants of a specified user or role.
void updateFromQuery(IAccessEntity & grantee, const ASTGrantQuery & query)
{
AccessRightsElements elements_to_grant, elements_to_revoke;
collectAccessRightsElementsToGrantOrRevoke(query, elements_to_grant, elements_to_revoke);
std::vector<UUID> roles_to_grant;
RolesOrUsersSet roles_to_revoke;
collectRolesToGrantOrRevoke(query, roles_to_grant, roles_to_revoke);
updateGrantedAccessRightsAndRoles(grantee, elements_to_grant, elements_to_revoke, roles_to_grant, roles_to_revoke, query.admin_option);
}
}
@ -283,16 +382,13 @@ BlockIO InterpreterGrantQuery::execute()
throw Exception("A partial revoke should be revoked, not granted", ErrorCodes::LOGICAL_ERROR);
auto & access_control = getContext()->getAccessControlManager();
std::optional<RolesOrUsersSet> roles_set;
if (query.roles)
roles_set = RolesOrUsersSet{*query.roles, access_control};
std::vector<UUID> grantees = RolesOrUsersSet{*query.grantees, access_control, getContext()->getUserID()}.getMatchingIDs(access_control);
/// Check if the current user has corresponding roles granted with admin option.
std::vector<UUID> roles;
if (roles_set)
roles = getRoleIDsAndCheckAdminOptionAndGrantees(access_control, *getContext()->getAccess(), query, *roles_set, grantees);
std::vector<UUID> roles_to_grant;
RolesOrUsersSet roles_to_revoke;
collectRolesToGrantOrRevoke(access_control, query, roles_to_grant, roles_to_revoke);
checkAdminOptionAndGrantees(access_control, *getContext()->getAccess(), grantees, roles_to_grant, roles_to_revoke, query.admin_option);
if (!query.cluster.empty())
{
@ -306,14 +402,15 @@ BlockIO InterpreterGrantQuery::execute()
query.replaceEmptyDatabase(getContext()->getCurrentDatabase());
/// Check if the current user has corresponding access rights with grant option.
if (!query.access_rights_elements.empty())
checkGrantOptionAndGrantees(access_control, *getContext()->getAccess(), query, grantees);
AccessRightsElements elements_to_grant, elements_to_revoke;
collectAccessRightsElementsToGrantOrRevoke(query, elements_to_grant, elements_to_revoke);
checkGrantOptionAndGrantees(access_control, *getContext()->getAccess(), grantees, elements_to_grant, elements_to_revoke);
/// Update roles and users listed in `grantees`.
auto update_func = [&](const AccessEntityPtr & entity) -> AccessEntityPtr
{
auto clone = entity->clone();
updateFromQueryImpl(*clone, query, roles);
updateGrantedAccessRightsAndRoles(*clone, elements_to_grant, elements_to_revoke, roles_to_grant, roles_to_revoke, query.admin_option);
return clone;
};
@ -325,21 +422,15 @@ BlockIO InterpreterGrantQuery::execute()
void InterpreterGrantQuery::updateUserFromQuery(User & user, const ASTGrantQuery & query)
{
std::vector<UUID> roles_to_grant_or_revoke;
if (query.roles)
roles_to_grant_or_revoke = RolesOrUsersSet{*query.roles}.getMatchingIDs();
updateFromQueryImpl(user, query, roles_to_grant_or_revoke);
updateFromQuery(user, query);
}
void InterpreterGrantQuery::updateRoleFromQuery(Role & role, const ASTGrantQuery & query)
{
std::vector<UUID> roles_to_grant_or_revoke;
if (query.roles)
roles_to_grant_or_revoke = RolesOrUsersSet{*query.roles}.getMatchingIDs();
updateFromQueryImpl(role, query, roles_to_grant_or_revoke);
updateFromQuery(role, query);
}
void InterpreterGrantQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & /*ast*/, ContextPtr) const
{
auto & query = query_ptr->as<ASTGrantQuery &>();

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@ -282,3 +282,36 @@ def test_current_database():
instance.query("CREATE TABLE default.table(x UInt32, y UInt32) ENGINE = MergeTree ORDER BY tuple()")
assert "Not enough privileges" in instance.query_and_get_error("SELECT * FROM table", user='A')
def test_grant_with_replace_option():
instance.query("CREATE USER A")
instance.query('GRANT SELECT ON test.table TO A')
assert instance.query("SHOW GRANTS FOR A") == TSV(["GRANT SELECT ON test.table TO A"])
instance.query('GRANT INSERT ON test.table TO A WITH REPLACE OPTION')
assert instance.query("SHOW GRANTS FOR A") == TSV(["GRANT INSERT ON test.table TO A"])
instance.query('GRANT NONE ON *.* TO A WITH REPLACE OPTION')
assert instance.query("SHOW GRANTS FOR A") == TSV([])
instance.query('CREATE USER B')
instance.query('GRANT SELECT ON test.table TO B')
assert instance.query("SHOW GRANTS FOR A") == TSV([])
assert instance.query("SHOW GRANTS FOR B") == TSV(["GRANT SELECT ON test.table TO B"])
expected_error = "it's necessary to have grant INSERT ON test.table WITH GRANT OPTION"
assert expected_error in instance.query_and_get_error("GRANT INSERT ON test.table TO B WITH REPLACE OPTION", user='A')
assert instance.query("SHOW GRANTS FOR A") == TSV([])
assert instance.query("SHOW GRANTS FOR B") == TSV(["GRANT SELECT ON test.table TO B"])
instance.query("GRANT INSERT ON test.table TO A WITH GRANT OPTION")
expected_error = "it's necessary to have grant SELECT ON test.table WITH GRANT OPTION"
assert expected_error in instance.query_and_get_error("GRANT INSERT ON test.table TO B WITH REPLACE OPTION", user='A')
assert instance.query("SHOW GRANTS FOR A") == TSV(["GRANT INSERT ON test.table TO A WITH GRANT OPTION"])
assert instance.query("SHOW GRANTS FOR B") == TSV(["GRANT SELECT ON test.table TO B"])
instance.query("GRANT SELECT ON test.table TO A WITH GRANT OPTION")
instance.query("GRANT INSERT ON test.table TO B WITH REPLACE OPTION", user='A')
assert instance.query("SHOW GRANTS FOR A") == TSV(["GRANT SELECT, INSERT ON test.table TO A WITH GRANT OPTION"])
assert instance.query("SHOW GRANTS FOR B") == TSV(["GRANT INSERT ON test.table TO B"])