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gssapi_client.cpp
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/* SPDX-License-Identifier: MPL-2.0 */
#include "precompiled.hpp"
#ifdef HAVE_LIBGSSAPI_KRB5
#include <string.h>
#include <string>
#include "msg.hpp"
#include "session_base.hpp"
#include "err.hpp"
#include "gssapi_client.hpp"
#include "wire.hpp"
zmq::gssapi_client_t::gssapi_client_t (session_base_t *session_,
const options_t &options_) :
mechanism_base_t (session_, options_),
gssapi_mechanism_base_t (session_, options_),
state (call_next_init),
token_ptr (GSS_C_NO_BUFFER),
mechs (),
security_context_established (false)
{
const std::string::size_type service_size =
options_.gss_service_principal.size ();
service_name = static_cast<char *> (malloc (service_size + 1));
assert (service_name);
memcpy (service_name, options_.gss_service_principal.c_str (),
service_size + 1);
service_name_type = convert_nametype (options_.gss_service_principal_nt);
maj_stat = GSS_S_COMPLETE;
if (!options_.gss_principal.empty ()) {
const std::string::size_type principal_size =
options_.gss_principal.size ();
principal_name = static_cast<char *> (malloc (principal_size + 1));
assert (principal_name);
memcpy (principal_name, options_.gss_principal.c_str (),
principal_size + 1);
gss_OID name_type = convert_nametype (options_.gss_principal_nt);
if (acquire_credentials (principal_name, &cred, name_type) != 0)
maj_stat = GSS_S_FAILURE;
}
mechs.elements = NULL;
mechs.count = 0;
}
zmq::gssapi_client_t::~gssapi_client_t ()
{
if (service_name)
free (service_name);
if (cred)
gss_release_cred (&min_stat, &cred);
}
int zmq::gssapi_client_t::next_handshake_command (msg_t *msg_)
{
if (state == send_ready) {
int rc = produce_ready (msg_);
if (rc == 0)
state = connected;
return rc;
}
if (state != call_next_init) {
errno = EAGAIN;
return -1;
}
if (initialize_context () < 0)
return -1;
if (produce_next_token (msg_) < 0)
return -1;
if (maj_stat != GSS_S_CONTINUE_NEEDED && maj_stat != GSS_S_COMPLETE)
return -1;
if (maj_stat == GSS_S_COMPLETE) {
security_context_established = true;
state = recv_ready;
} else
state = recv_next_token;
return 0;
}
int zmq::gssapi_client_t::process_handshake_command (msg_t *msg_)
{
if (state == recv_ready) {
int rc = process_ready (msg_);
if (rc == 0)
state = send_ready;
return rc;
}
if (state != recv_next_token) {
session->get_socket ()->event_handshake_failed_protocol (
session->get_endpoint (), ZMQ_PROTOCOL_ERROR_ZMTP_UNEXPECTED_COMMAND);
errno = EPROTO;
return -1;
}
if (process_next_token (msg_) < 0)
return -1;
if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED)
return -1;
state = call_next_init;
errno_assert (msg_->close () == 0);
errno_assert (msg_->init () == 0);
return 0;
}
int zmq::gssapi_client_t::encode (msg_t *msg_)
{
zmq_assert (state == connected);
if (do_encryption)
return encode_message (msg_);
return 0;
}
int zmq::gssapi_client_t::decode (msg_t *msg_)
{
zmq_assert (state == connected);
if (do_encryption)
return decode_message (msg_);
return 0;
}
zmq::mechanism_t::status_t zmq::gssapi_client_t::status () const
{
return state == connected ? mechanism_t::ready : mechanism_t::handshaking;
}
int zmq::gssapi_client_t::initialize_context ()
{
// principal was specified but credentials could not be acquired
if (principal_name != NULL && cred == NULL)
return -1;
// First time through, import service_name into target_name
if (target_name == GSS_C_NO_NAME) {
send_tok.value = service_name;
send_tok.length = strlen (service_name) + 1;
OM_uint32 maj = gss_import_name (&min_stat, &send_tok,
service_name_type, &target_name);
if (maj != GSS_S_COMPLETE)
return -1;
}
maj_stat = gss_init_sec_context (
&init_sec_min_stat, cred, &context, target_name, mechs.elements,
gss_flags, 0, NULL, token_ptr, NULL, &send_tok, &ret_flags, NULL);
if (token_ptr != GSS_C_NO_BUFFER)
free (recv_tok.value);
return 0;
}
int zmq::gssapi_client_t::produce_next_token (msg_t *msg_)
{
if (send_tok.length != 0) { // Server expects another token
if (produce_initiate (msg_, send_tok.value, send_tok.length) < 0) {
gss_release_buffer (&min_stat, &send_tok);
gss_release_name (&min_stat, &target_name);
return -1;
}
}
gss_release_buffer (&min_stat, &send_tok);
if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED) {
gss_release_name (&min_stat, &target_name);
if (context != GSS_C_NO_CONTEXT)
gss_delete_sec_context (&min_stat, &context, GSS_C_NO_BUFFER);
return -1;
}
return 0;
}
int zmq::gssapi_client_t::process_next_token (msg_t *msg_)
{
if (maj_stat == GSS_S_CONTINUE_NEEDED) {
if (process_initiate (msg_, &recv_tok.value, recv_tok.length) < 0) {
gss_release_name (&min_stat, &target_name);
return -1;
}
token_ptr = &recv_tok;
}
return 0;
}
#endif