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/*
Copyright (c) 2007-2014 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "platform.hpp"
#ifdef HAVE_LIBGSSAPI_KRB5
#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#endif
#include <string.h>
#include <string>
#include "msg.hpp"
#include "session_base.hpp"
#include "err.hpp"
#include "gssapi_mechanism_base.hpp"
#include "wire.hpp"
zmq::gssapi_mechanism_base_t::gssapi_mechanism_base_t (const options_t & options_) :
mechanism_t(options_),
send_tok (),
recv_tok (),
/// FIXME remove? in_buf (),
target_name (GSS_C_NO_NAME),
principal_name (NULL),
maj_stat (GSS_S_COMPLETE),
min_stat (0),
init_sec_min_stat (0),
ret_flags (0),
gss_flags (GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG),
cred (GSS_C_NO_CREDENTIAL),
context (GSS_C_NO_CONTEXT),
do_encryption (!options_.gss_plaintext)
{
}
zmq::gssapi_mechanism_base_t::~gssapi_mechanism_base_t ()
{
if(target_name)
gss_release_name(&min_stat, &target_name);
if(context)
gss_delete_sec_context(&min_stat, &context, GSS_C_NO_BUFFER);
}
int zmq::gssapi_mechanism_base_t::encode_message (msg_t *msg_)
{
// Wrap the token value
int state;
gss_buffer_desc plaintext;
gss_buffer_desc wrapped;
uint8_t flags = 0;
if (msg_->flags () & msg_t::more)
flags |= 0x01;
uint8_t *plaintext_buffer = static_cast <uint8_t *>(malloc(msg_->size ()+1));
plaintext_buffer[0] = flags;
memcpy (plaintext_buffer+1, msg_->data(), msg_->size());
plaintext.value = plaintext_buffer;
plaintext.length = msg_->size ()+1;
maj_stat = gss_wrap(&min_stat, context, 1, GSS_C_QOP_DEFAULT,
&plaintext, &state, &wrapped);
zmq_assert (maj_stat == GSS_S_COMPLETE);
zmq_assert (state);
// Re-initialize msg_ for wrapped text
int rc = msg_->close ();
zmq_assert (rc == 0);
rc = msg_->init_size (8 + 4 + wrapped.length);
zmq_assert (rc == 0);
uint8_t *ptr = static_cast <uint8_t *> (msg_->data ());
// Add command string
memcpy (ptr, "\x07MESSAGE", 8);
ptr += 8;
// Add token length
put_uint32 (ptr, static_cast <uint32_t> (wrapped.length));
ptr += 4;
// Add wrapped token value
memcpy (ptr, wrapped.value, wrapped.length);
ptr += wrapped.length;
gss_release_buffer (&min_stat, &wrapped);
return 0;
}
int zmq::gssapi_mechanism_base_t::decode_message (msg_t *msg_)
{
const uint8_t *ptr = static_cast <uint8_t *> (msg_->data ());
size_t bytes_left = msg_->size ();
// Get command string
if (bytes_left < 8 || memcmp (ptr, "\x07MESSAGE", 8)) {
errno = EPROTO;
return -1;
}
ptr += 8;
bytes_left -= 8;
// Get token length
if (bytes_left < 4) {
errno = EPROTO;
return -1;
}
gss_buffer_desc wrapped;
wrapped.length = get_uint32 (ptr);
ptr += 4;
bytes_left -= 4;
// Get token value
if (bytes_left < wrapped.length) {
errno = EPROTO;
return -1;
}
// TODO: instead of malloc/memcpy, can we just do: wrapped.value = ptr;
const size_t alloc_length = wrapped.length? wrapped.length: 1;
wrapped.value = static_cast <char *> (malloc (alloc_length));
if (wrapped.length) {
alloc_assert (wrapped.value);
memcpy(wrapped.value, ptr, wrapped.length);
ptr += wrapped.length;
bytes_left -= wrapped.length;
}
// Unwrap the token value
int state;
gss_buffer_desc plaintext;
maj_stat = gss_unwrap(&min_stat, context, &wrapped, &plaintext,
&state, (gss_qop_t *) NULL);
zmq_assert(maj_stat == GSS_S_COMPLETE);
zmq_assert(state);
// Re-initialize msg_ for plaintext
int rc = msg_->close ();
zmq_assert (rc == 0);
rc = msg_->init_size (plaintext.length-1);
zmq_assert (rc == 0);
const uint8_t flags = static_cast <char *> (plaintext.value)[0];
if (flags & 0x01)
msg_->set_flags (msg_t::more);
memcpy (msg_->data (), static_cast <char *> (plaintext.value)+1, plaintext.length-1);
gss_release_buffer (&min_stat, &plaintext);
gss_release_buffer (&min_stat, &wrapped);
if (bytes_left > 0) {
errno = EPROTO;
return -1;
}
return 0;
}
int zmq::gssapi_mechanism_base_t::produce_initiate (msg_t *msg_, void *token_value_, size_t token_length_)
{
zmq_assert (token_value_);
zmq_assert (token_length_ <= 0xFFFFFFFFUL);
const size_t command_size = 9 + 4 + token_length_;
const int rc = msg_->init_size (command_size);
errno_assert (rc == 0);
uint8_t *ptr = static_cast <uint8_t *> (msg_->data ());
// Add command string
memcpy (ptr, "\x08INITIATE", 9);
ptr += 9;
// Add token length
put_uint32 (ptr, static_cast <uint32_t> (token_length_));
ptr += 4;
// Add token value
memcpy (ptr, token_value_, token_length_);
ptr += token_length_;
return 0;
}
int zmq::gssapi_mechanism_base_t::process_initiate (msg_t *msg_, void **token_value_, size_t &token_length_)
{
zmq_assert (token_value_);
const uint8_t *ptr = static_cast <uint8_t *> (msg_->data ());
size_t bytes_left = msg_->size ();
// Get command string
if (bytes_left < 9 || memcmp (ptr, "\x08INITIATE", 9)) {
errno = EPROTO;
return -1;
}
ptr += 9;
bytes_left -= 9;
// Get token length
if (bytes_left < 4) {
errno = EPROTO;
return -1;
}
token_length_ = get_uint32 (ptr);
ptr += 4;
bytes_left -= 4;
// Get token value
if (bytes_left < token_length_) {
errno = EPROTO;
return -1;
}
*token_value_ = static_cast <char *> (malloc (token_length_ ? token_length_ : 1));
if (token_length_) {
alloc_assert (*token_value_);
memcpy(*token_value_, ptr, token_length_);
ptr += token_length_;
bytes_left -= token_length_;
}
if (bytes_left > 0) {
errno = EPROTO;
return -1;
}
return 0;
}
int zmq::gssapi_mechanism_base_t::produce_ready (msg_t *msg_)
{
unsigned char * const command_buffer = (unsigned char *) malloc (512);
alloc_assert (command_buffer);
unsigned char *ptr = command_buffer;
// Add command name
memcpy (ptr, "\x05READY", 6);
ptr += 6;
// Add socket type property
const char *socket_type = socket_type_string (options.type);
ptr += add_property (ptr, "Socket-Type", socket_type, strlen (socket_type));
// Add identity property
if (options.type == ZMQ_REQ
|| options.type == ZMQ_DEALER
|| options.type == ZMQ_ROUTER)
ptr += add_property (ptr, "Identity", options.identity, options.identity_size);
const size_t command_size = ptr - command_buffer;
const int rc = msg_->init_size (command_size);
errno_assert (rc == 0);
memcpy (msg_->data (), command_buffer, command_size);
free (command_buffer);
if (do_encryption)
return encode_message (msg_);
return 0;
}
int zmq::gssapi_mechanism_base_t::process_ready (msg_t *msg_)
{
if (do_encryption) {
const int rc = decode_message (msg_);
if (rc != 0)
return rc;
}
const unsigned char *ptr = static_cast <unsigned char *> (msg_->data ());
size_t bytes_left = msg_->size ();
if (bytes_left < 6 || memcmp (ptr, "\x05READY", 6)) {
errno = EPROTO;
return -1;
}
ptr += 6;
bytes_left -= 6;
return parse_metadata (ptr, bytes_left);
}
int zmq::gssapi_mechanism_base_t::acquire_credentials (char * service_name_, gss_cred_id_t * cred_)
{
OM_uint32 maj_stat;
OM_uint32 min_stat;
gss_name_t server_name;
gss_buffer_desc name_buf;
name_buf.value = service_name_;
name_buf.length = strlen ((char *) name_buf.value) + 1;
maj_stat = gss_import_name (&min_stat, &name_buf,
GSS_C_NT_HOSTBASED_SERVICE, &server_name);
if (maj_stat != GSS_S_COMPLETE)
return -1;
maj_stat = gss_acquire_cred (&min_stat, server_name, 0,
GSS_C_NO_OID_SET, GSS_C_ACCEPT,
cred_, NULL, NULL);
if (maj_stat != GSS_S_COMPLETE)
return -1;
gss_release_name(&min_stat, &server_name);
return 0;
}
#endif