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288 | // Copyright (C) 2022-2024 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Kea Hooks Basic
// Commercial End User License Agreement v2.0. See COPYING file in the premium/
// directory.
#include <config.h>
#include <rbac.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <rbac_config.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <rbac_log.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <cc/command_interpreter.h>
#include <exceptions/exceptions.h>
#include <hooks/hooks.h>
#include <http/post_request_json.h>
#include <process/daemon.h>
using namespace isc;
using namespace isc::config;
using namespace isc::data;
using namespace isc::hooks;
using namespace isc::http;
using namespace isc::log;
using namespace isc::process;
using namespace isc::rbac;
using namespace std;
// Functions accessed by the hooks framework use C linkage to avoid the name
// mangling that accompanies use of the C++ compiler as well as to avoid
// issues related to namespaces.
extern "C" {
/// @brief This function is called when the library is loaded.
///
/// @param handle library handle.
/// @return 0 when initialization is successful, 1 otherwise.
int
load(LibraryHandle& handle) {
try {
// Make the hook library loadable only by the control agent.
const string& proc_name = Daemon::getProcName();
if (proc_name != "kea-ctrl-agent") {
isc_throw(Unexpected, "Bad process name: " << proc_name
<< ", expected kea-ctrl-agent");
}
// Load the configuration.
ConstElementPtr config = handle.getParameters();
rbacConfig.init();
Config::parse(config);
} catch (const std::exception& ex) {
LOG_ERROR(rbac_logger, RBAC_LOAD_FAILED)
.arg(ex.what());
return (1);
}
LOG_INFO(rbac_logger, RBAC_LOAD_OK);
return (0);
}
/// @brief This function is called when the library is unloaded.
///
/// @return always 0.
int
unload() {
if (roleAssign) {
roleAssign->setup(false);
}
roleAssign.reset();
roleConfigTable.clear();
defaultRoleConfig.reset();
unknownRoleConfig.reset();
aclTable.clear();
apiTable.clear();
apiAccesses.clear();
apiHooks.clear();
responseFilterTable.clear();
LOG_INFO(rbac_logger, RBAC_UNLOAD_OK);
return (0);
}
/// @brief This function is called to retrieve the multi-threading compatibility.
///
/// @return 1 which means compatible with multi-threading.
int multi_threading_compatible() {
return (1);
}
/// @brief This callout is called at the "auth" hook.
///
/// @param handle CalloutHandle.
/// @return 0 upon success, non-zero otherwise.
int
auth(CalloutHandle& handle) {
if (!roleAssign) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC, RBAC_TRACE_AUTH_DISABLED);
return (0);
}
// Get the parameters.
HttpRequestPtr request;
HttpResponseJsonPtr response;<--- Shadow variable
handle.getArgument("request", request);
handle.getArgument("response", response);
if (response) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC, RBAC_TRACE_AUTH_RESPONSE)
.arg(response->toBriefString());
return (0);
}
auto status_code = HttpStatusCode::FORBIDDEN;
bool updated = false;
try {
// Most errors will be caught later.
if (!request) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_AUTH_NO_REQUEST);
return (0);
}
// Check TLS.
if (rbacConfig.getRequireTls() && !Role::requireTls(request)) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_AUTH_NO_TLS_REJECT);
status_code = HttpStatusCode::UNAUTHORIZED;
response = RoleConfig::createReject(request, status_code);
LOG_INFO(rbac_logger, RBAC_AUTH_RESPONSE)
.arg(response->toBriefString());
handle.setArgument("response", response);
return (0);
}
PostHttpRequestJsonPtr request_json =
boost::dynamic_pointer_cast<PostHttpRequestJson>(request);
if (!request_json) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_AUTH_NO_JSON);
return (0);
}
ConstElementPtr body = request_json->getBodyAsJson();
if (!body) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_AUTH_EMPTY_BODY);
return (0);
}
if (body->getType() != Element::map) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_AUTH_BAD_BODY_TYPE);
return (0);
}
ConstElementPtr elem = body->get(CONTROL_COMMAND);
if (!elem) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_AUTH_NO_COMMAND);
return (0);
}
if (elem->getType() != Element::string) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_AUTH_BAD_COMMAND_TYPE);
return (0);
}
string command = elem->stringValue();
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC, RBAC_TRACE_AUTH_COMMAND)
.arg(command);
// Assign role.
const string& role = roleAssign->assign(request);
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC, RBAC_TRACE_AUTH_ROLE)
.arg(role);
RoleConfigPtr role_config = RoleConfig::getConfig(role);
if (!role_config) {
isc_throw(Unexpected, "can't find a role configuration");
}
// Filter command.
if (role_config->match(command)) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC, RBAC_TRACE_AUTH_ACCEPT)
.arg(role_config->name_)
.arg(role)
.arg(command);
if ((command == "config-set") || (command == "config-reload")) {
// Ask the handle to be reset so the hook can be unloaded
// without keeping a pointer to its address space...
handle.setStatus(CalloutHandle::NEXT_STEP_SKIP);
} else if (!role_config->response_filters_.empty()) {
// Save values in the context for the response callout.
handle.setContext("command", command);
handle.setContext("role_config", role_config);
}
} else {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC, RBAC_TRACE_AUTH_REJECT)
.arg(role_config->name_)
.arg(role)
.arg(command);
response = RoleConfig::createReject(request, status_code);
updated = true;
}
} catch (const std::exception& ex) {
LOG_ERROR(rbac_logger, RBAC_AUTH_ERROR)
.arg(ex.what());
status_code = HttpStatusCode::INTERNAL_SERVER_ERROR;
response = RoleConfig::createReject(request, status_code);
updated = true;
}
// Set parameters.
if (updated) {
LOG_INFO(rbac_logger, RBAC_AUTH_RESPONSE)
.arg(response->toBriefString());
handle.setArgument("response", response);
}
return (0);
}
/// @brief This callout is called at the "response" hook.
///
/// @param handle CalloutHandle.
/// @return 0 upon success, non-zero otherwise.
int
response(CalloutHandle& handle) {<--- Shadowed declaration<--- Parameter 'handle' can be declared as reference to const
if (!roleAssign) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_RESPONSE_DISABLED);
return (0);
}
// Get the parameters.
HttpRequestPtr request;
HttpResponseJsonPtr response;
handle.getArgument("request", request);
handle.getArgument("response", response);
if (!request || !response) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_RESPONSE_NO_ARGUMENTS);
return (0);
}
// Decode response.
ConstElementPtr body = response->getBodyAsJson();
if (!body) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_RESPONSE_EMPTY_BODY);
return (0);
}
if (body->getType() != Element::list) {
// Should be an error response, anyway nothing to filter.
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_RESPONSE_BAD_BODY_TYPE);
return (0);
}
if (body->size() < 1) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_RESPONSE_EMPTY_BODY_LIST);
return (0);
}
// Recover command and role config;
string command;
RoleConfigPtr role_config;
handle.getOptionalContext("command", command);
handle.getOptionalContext("role_config", role_config);
if (!role_config || (role_config->response_filters_.empty())) {
return (0);
}
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC, RBAC_TRACE_RESPONSE_CONTEXT)
.arg(command)
.arg(role_config->name_);
// Apply filters on each list item.
bool modified = false;
for (auto const& answer : body->listValue()) {
if (role_config->filter(command, answer)) {
modified = true;
}
}
if (modified) {
LOG_DEBUG(rbac_logger, DBGLVL_TRACE_BASIC,
RBAC_TRACE_RESPONSE_MODIFIED);
response->setBodyAsJson(body);
}
return (0);
}
}
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