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/*
Copyright (C) 2013 Simo Sorce <simo@samba.org>
This library 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.
This library 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 library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "gssapi_ntlmssp.h"
#include "gss_ntlmssp.h"
uint32_t gssntlm_get_mic(uint32_t *minor_status,
gss_ctx_id_t context_handle,
gss_qop_t qop_req,
gss_buffer_t message_buffer,
gss_buffer_t message_token)
{
struct gssntlm_ctx *ctx;
struct ntlm_buffer message;
struct ntlm_buffer signature;
uint32_t retmaj, retmin;
ctx = (struct gssntlm_ctx *)context_handle;
retmaj = gssntlm_context_is_valid(ctx, NULL);
if (retmaj != GSS_S_COMPLETE) {
return GSSERRS(ERR_BADCTX, retmaj);
}
if (qop_req != GSS_C_QOP_DEFAULT) {
return GSSERRS(ERR_BADARG, GSS_S_BAD_QOP);
}
if (!message_buffer->value || message_buffer->length == 0) {
return GSSERRS(ERR_BADARG, GSS_S_CALL_INACCESSIBLE_READ);
}
message_token->value = malloc(NTLM_SIGNATURE_SIZE);
if (!message_token->value) {
return GSSERRS(ENOMEM, GSS_S_FAILURE);
}
message_token->length = NTLM_SIGNATURE_SIZE;
message.data = message_buffer->value;
message.length = message_buffer->length;
signature.data = message_token->value;
signature.length = message_token->length;
retmin = ntlm_sign(ctx->neg_flags, NTLM_SEND,
&ctx->crypto_state,
&message, &signature);
if (retmin) {
safefree(message_token->value);
return GSSERRS(retmin, GSS_S_FAILURE);
}
return GSSERRS(0, GSS_S_COMPLETE);
}
uint32_t gssntlm_verify_mic(uint32_t *minor_status,
gss_ctx_id_t context_handle,
gss_buffer_t message_buffer,
gss_buffer_t message_token,
gss_qop_t *qop_state)
{
struct gssntlm_ctx *ctx;
struct ntlm_buffer message;
uint8_t token[16];
struct ntlm_buffer signature = { token, NTLM_SIGNATURE_SIZE };
uint32_t retmaj, retmin;
ctx = (struct gssntlm_ctx *)context_handle;
retmaj = gssntlm_context_is_valid(ctx, NULL);
if (retmaj != GSS_S_COMPLETE) {
return GSSERRS(ERR_BADCTX, retmaj);
}
if (!message_buffer->value || message_buffer->length == 0) {
return GSSERRS(ERR_NOARG, GSS_S_CALL_INACCESSIBLE_READ);
}
if (qop_state) {
*qop_state = GSS_C_QOP_DEFAULT;
}
message.data = message_buffer->value;
message.length = message_buffer->length;
retmin = ntlm_sign(ctx->neg_flags, NTLM_RECV,
&ctx->crypto_state,
&message, &signature);
if (retmin) {
return GSSERRS(retmin, GSS_S_FAILURE);
}
if (memcmp(signature.data,
message_token->value, NTLM_SIGNATURE_SIZE) != 0) {
return GSSERRS(0, GSS_S_BAD_SIG);
}
return GSSERRS(0, GSS_S_COMPLETE);
}
uint32_t gssntlm_wrap(uint32_t *minor_status,
gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
gss_buffer_t input_message_buffer,
int *conf_state,
gss_buffer_t output_message_buffer)
{
struct gssntlm_ctx *ctx;
struct ntlm_buffer message;
struct ntlm_buffer output;
struct ntlm_buffer signature;
uint32_t retmaj, retmin;
ctx = (struct gssntlm_ctx *)context_handle;
retmaj = gssntlm_context_is_valid(ctx, NULL);
if (retmaj != GSS_S_COMPLETE) {
return GSSERRS(ERR_BADCTX, retmaj);
}
if (qop_req != GSS_C_QOP_DEFAULT) {
return GSSERRS(ERR_BADARG, GSS_S_BAD_QOP);
}
if (!input_message_buffer->value || input_message_buffer->length == 0) {
return GSSERRS(ERR_BADARG, GSS_S_CALL_INACCESSIBLE_READ);
}
if (conf_state) {
*conf_state = 0;
}
if (conf_req_flag == 0) {
/* ignore, always seal */
}
output_message_buffer->length =
input_message_buffer->length + NTLM_SIGNATURE_SIZE;
output_message_buffer->value = malloc(output_message_buffer->length);
if (!output_message_buffer->value) {
return GSSERRS(ENOMEM, GSS_S_FAILURE);
}
message.data = input_message_buffer->value;
message.length = input_message_buffer->length;
signature.data = output_message_buffer->value;
signature.length = NTLM_SIGNATURE_SIZE;
output.data = (uint8_t *)output_message_buffer->value + NTLM_SIGNATURE_SIZE;
output.length = input_message_buffer->length;
retmin = ntlm_seal(ctx->neg_flags, &ctx->crypto_state,
&message, &output, &signature);
if (retmin) {
safefree(output_message_buffer->value);
return GSSERRS(retmin, GSS_S_FAILURE);
}
return GSSERRS(0, GSS_S_COMPLETE);
}
uint32_t gssntlm_unwrap(uint32_t *minor_status,
gss_ctx_id_t context_handle,
gss_buffer_t input_message_buffer,
gss_buffer_t output_message_buffer,
int *conf_state,
gss_qop_t *qop_state)
{
struct gssntlm_ctx *ctx;
struct ntlm_buffer message;
struct ntlm_buffer output;
uint8_t sig[16];
struct ntlm_buffer signature = { sig, NTLM_SIGNATURE_SIZE };
uint32_t retmaj, retmin;
ctx = (struct gssntlm_ctx *)context_handle;
retmaj = gssntlm_context_is_valid(ctx, NULL);
if (retmaj != GSS_S_COMPLETE) {
return GSSERRS(ERR_BADCTX, retmaj);
}
if (!input_message_buffer->value || input_message_buffer->length == 0) {
return GSSERRS(ERR_BADARG, GSS_S_CALL_INACCESSIBLE_READ);
}
if (conf_state) {
*conf_state = 0;
}
if (qop_state) {
*qop_state = GSS_C_QOP_DEFAULT;
}
output_message_buffer->length =
input_message_buffer->length - NTLM_SIGNATURE_SIZE;
output_message_buffer->value = malloc(output_message_buffer->length);
if (!output_message_buffer->value) {
return GSSERRS(ENOMEM, GSS_S_FAILURE);
}
message.data = (uint8_t *)input_message_buffer->value + NTLM_SIGNATURE_SIZE;
message.length = input_message_buffer->length - NTLM_SIGNATURE_SIZE;
output.data = output_message_buffer->value;
output.length = output_message_buffer->length;
retmin = ntlm_unseal(ctx->neg_flags, &ctx->crypto_state,
&message, &output, &signature);
if (retmin) {
safefree(output_message_buffer->value);
return GSSERRS(retmin, GSS_S_FAILURE);
}
if (memcmp(input_message_buffer->value,
signature.data, NTLM_SIGNATURE_SIZE) != 0) {
safefree(output_message_buffer->value);
return GSSERRS(0, GSS_S_BAD_SIG);
}
return GSSERRS(0, GSS_S_COMPLETE);
}
uint32_t gssntlm_wrap_size_limit(uint32_t *minor_status,
gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
uint32_t req_output_size,
uint32_t *max_input_size)
{
struct gssntlm_ctx *ctx;
uint32_t retmaj, retmin;
ctx = (struct gssntlm_ctx *)context_handle;
retmaj = gssntlm_context_is_valid(ctx, NULL);
if (retmaj != GSS_S_COMPLETE) {
return GSSERRS(ERR_BADCTX, retmaj);
}
if (qop_req != GSS_C_QOP_DEFAULT) {
return GSSERRS(ERR_BADARG, GSS_S_BAD_QOP);
}
if (req_output_size < 16) {
*max_input_size = 0;
} else {
*max_input_size = req_output_size - NTLM_SIGNATURE_SIZE;
}
return GSSERRS(0, GSS_S_COMPLETE);
}
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