accept_sec_context.c

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	    ctx->verified_mic = 1;
	}
	if (buf.value)
	    free(buf.value);

    } else
	*get_mic = verify_mic = 0;
    
    return GSS_S_COMPLETE;
}


static OM_uint32
acceptor_start
	   (OM_uint32 * minor_status,
	    gss_ctx_id_t * context_handle,
	    const gss_cred_id_t acceptor_cred_handle,
	    const gss_buffer_t input_token_buffer,
	    const gss_channel_bindings_t input_chan_bindings,
	    gss_name_t * src_name,
	    gss_OID * mech_type,
	    gss_buffer_t output_token,
	    OM_uint32 * ret_flags,
	    OM_uint32 * time_rec,
	    gss_cred_id_t *delegated_cred_handle
	   )
{
    OM_uint32 ret, junk;
    NegotiationToken nt;
    size_t nt_len;
    NegTokenInit *ni;
    int i;
    gss_buffer_desc data;
    gss_buffer_t mech_input_token = GSS_C_NO_BUFFER;
    gss_buffer_desc mech_output_token;
    gss_buffer_desc mech_buf;
    gss_OID preferred_mech_type = GSS_C_NO_OID;
    gssspnego_ctx ctx;
    gssspnego_cred acceptor_cred = (gssspnego_cred)acceptor_cred_handle;
    int get_mic = 0;
    int first_ok = 0;

    mech_output_token.value = NULL;
    mech_output_token.length = 0;
    mech_buf.value = NULL;

    if (input_token_buffer->length == 0)
	return send_supported_mechs (minor_status, output_token);
	
    ret = _gss_spnego_alloc_sec_context(minor_status, context_handle);
    if (ret != GSS_S_COMPLETE)
	return ret;

    ctx = (gssspnego_ctx)*context_handle;

    /*
     * The GSS-API encapsulation is only present on the initial
     * context token (negTokenInit).
     */
    ret = gss_decapsulate_token (input_token_buffer,
				 GSS_SPNEGO_MECHANISM,
				 &data);
    if (ret)
	return ret;

    ret = decode_NegotiationToken(data.value, data.length, &nt, &nt_len);
    gss_release_buffer(minor_status, &data);
    if (ret) {
	*minor_status = ret;
	return GSS_S_DEFECTIVE_TOKEN;
    }
    if (nt.element != choice_NegotiationToken_negTokenInit) {
	*minor_status = 0;
	return GSS_S_DEFECTIVE_TOKEN;
    }
    ni = &nt.u.negTokenInit;

    if (ni->mechTypes.len < 1) {
	free_NegotiationToken(&nt);
	*minor_status = 0;
	return GSS_S_DEFECTIVE_TOKEN;
    }

    HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);

    ret = copy_MechTypeList(&ni->mechTypes, &ctx->initiator_mech_types);
    if (ret) {
	HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
	free_NegotiationToken(&nt);
	*minor_status = ret;
	return GSS_S_FAILURE;
    }

    /*
     * First we try the opportunistic token if we have support for it,
     * don't try to verify we have credential for the token,
     * gss_accept_sec_context() will (hopefully) tell us that.
     * If that failes, 
     */

    ret = select_mech(minor_status,
		      &ni->mechTypes.val[0], 
		      0,
		      &preferred_mech_type);

    if (ret == 0 && ni->mechToken != NULL) {
	gss_cred_id_t mech_delegated_cred = GSS_C_NO_CREDENTIAL;
	gss_cred_id_t mech_cred;
	gss_buffer_desc ibuf;

	ibuf.length = ni->mechToken->length;
	ibuf.value = ni->mechToken->data;
	mech_input_token = &ibuf;

	if (acceptor_cred != NULL)
	    mech_cred = acceptor_cred->negotiated_cred_id;
	else
	    mech_cred = GSS_C_NO_CREDENTIAL;
	
	if (ctx->mech_src_name != GSS_C_NO_NAME)
	    gss_release_name(&junk, &ctx->mech_src_name);
	
	if (ctx->delegated_cred_id != GSS_C_NO_CREDENTIAL)
	    _gss_spnego_release_cred(&junk, &ctx->delegated_cred_id);
	
	ret = gss_accept_sec_context(minor_status,
				     &ctx->negotiated_ctx_id,
				     mech_cred,
				     mech_input_token,
				     input_chan_bindings,
				     &ctx->mech_src_name,
				     &ctx->negotiated_mech_type,
				     &mech_output_token,
				     &ctx->mech_flags,
				     &ctx->mech_time_rec,
				     &mech_delegated_cred);
	if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
	    ctx->preferred_mech_type = preferred_mech_type;
	    ctx->negotiated_mech_type = preferred_mech_type;
	    if (ret == GSS_S_COMPLETE)
		ctx->open = 1;

	    if (mech_delegated_cred && delegated_cred_handle)
		ret = _gss_spnego_alloc_cred(&junk,
					     mech_delegated_cred,
					     delegated_cred_handle);
	    else
		gss_release_cred(&junk, &mech_delegated_cred);

	    ret = acceptor_complete(minor_status,
				    ctx,
				    &get_mic,
				    &mech_buf,
				    mech_input_token,
				    &mech_output_token,
				    ni->mechListMIC,
				    output_token);
	    if (ret != GSS_S_COMPLETE)
		goto out;

	    first_ok = 1;
	} else {
	    gss_mg_collect_error(preferred_mech_type, ret, *minor_status);
	}
    }

    /*
     * If opportunistic token failed, lets try the other mechs.
     */

    if (!first_ok && ni->mechToken != NULL) {

	preferred_mech_type = GSS_C_NO_OID;

	/* Call glue layer to find first mech we support */
	for (i = 1; i < ni->mechTypes.len; ++i) {
	    ret = select_mech(minor_status,
			      &ni->mechTypes.val[i],
			      1,
			      &preferred_mech_type);
	    if (ret == 0)
		break;
	}
	if (preferred_mech_type == GSS_C_NO_OID) {
	    HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
	    free_NegotiationToken(&nt);
	    return ret;
	}

	ctx->preferred_mech_type = preferred_mech_type;
	ctx->negotiated_mech_type = preferred_mech_type;
    }

    /*
     * The initial token always have a response
     */

    ret = send_accept (minor_status,
		       ctx,
		       &mech_output_token,
		       1,
		       get_mic ? &mech_buf : NULL,
		       output_token);
    if (ret)
	goto out;
    
out:
    if (mech_output_token.value != NULL)
	gss_release_buffer(&junk, &mech_output_token);
    if (mech_buf.value != NULL) {
	free(mech_buf.value);
	mech_buf.value = NULL;
    }
    free_NegotiationToken(&nt);


    if (ret == GSS_S_COMPLETE) {
	if (src_name != NULL && ctx->mech_src_name != NULL) {
	    spnego_name name;

	    name = calloc(1, sizeof(*name));
	    if (name) {
		name->mech = ctx->mech_src_name;
		ctx->mech_src_name = NULL;
		*src_name = (gss_name_t)name;
	    }
	}
        if (delegated_cred_handle != NULL) {
	    *delegated_cred_handle = ctx->delegated_cred_id;
	    ctx->delegated_cred_id = GSS_C_NO_CREDENTIAL;
	}
    }
    
    if (mech_type != NULL)
	*mech_type = ctx->negotiated_mech_type;
    if (ret_flags != NULL)
	*ret_flags = ctx->mech_flags;
    if (time_rec != NULL)
	*time_rec = ctx->mech_time_rec;

    if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
	HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 	return ret;
    }

    _gss_spnego_internal_delete_sec_context(&junk, context_handle,
					    GSS_C_NO_BUFFER);
    
    return ret;
}


static OM_uint32
acceptor_continue
	   (OM_uint32 * minor_status,
	    gss_ctx_id_t * context_handle,
	    const gss_cred_id_t acceptor_cred_handle,
	    const gss_buffer_t input_token_buffer,
	    const gss_channel_bindings_t input_chan_bindings,
	    gss_name_t * src_name,
	    gss_OID * mech_type,
	    gss_buffer_t output_token,
	    OM_uint32 * ret_flags,
	    OM_uint32 * time_rec,
	    gss_cred_id_t *delegated_cred_handle
	   )
{
    OM_uint32 ret, ret2, minor;
    NegotiationToken nt;
    size_t nt_len;
    NegTokenResp *na;
    unsigned int negResult = accept_incomplete;
    gss_buffer_t mech_input_token = GSS_C_NO_BUFFER;
    gss_buffer_t mech_output_token = GSS_C_NO_BUFFER;
    gss_buffer_desc mech_buf;
    gssspnego_ctx ctx;
    gssspnego_cred acceptor_cred = (gssspnego_cred)acceptor_cred_handle;

    mech_buf.value = NULL;

    ctx = (gssspnego_ctx)*context_handle;

    /*
     * The GSS-API encapsulation is only present on the initial
     * context token (negTokenInit).
     */

    ret = decode_NegotiationToken(input_token_buffer->value, 
				  input_token_buffer->length,
				  &nt, &nt_len);
    if (ret) {
	*minor_status = ret;
	return GSS_S_DEFECTIVE_TOKEN;
    }
    if (nt.element != choice_NegotiationToken_negTokenResp) {
	*minor_status = 0;
	return GSS_S_DEFECTIVE_TOKEN;
    }
    na = &nt.u.negTokenResp;

    if (na->negResult != NULL) {
	negResult = *(na->negResult);
    }

    HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);

    {
	gss_buffer_desc ibuf, obuf;
	int require_mic, get_mic = 0;
	int require_response;
	heim_octet_string *mic;

	if (na->responseToken != NULL) {
	    ibuf.length = na->responseToken->length;
	    ibuf.value = na->responseToken->data;
	    mech_input_token = &ibuf;
	} else {
	    ibuf.value = NULL;
	    ibuf.length = 0;
	}

	if (mech_input_token != GSS_C_NO_BUFFER) {
	    gss_cred_id_t mech_cred;
	    gss_cred_id_t mech_delegated_cred;
	    gss_cred_id_t *mech_delegated_cred_p;

	    if (acceptor_cred != NULL)
		mech_cred = acceptor_cred->negotiated_cred_id;
	    else
		mech_cred = GSS_C_NO_CREDENTIAL;

	    if (delegated_cred_handle != NULL) {
		mech_delegated_cred = GSS_C_NO_CREDENTIAL;
		mech_delegated_cred_p = &mech_delegated_cred;
	    } else {
		mech_delegated_cred_p = NULL;
	    }

	    if (ctx->mech_src_name != GSS_C_NO_NAME)
		gss_release_name(&minor, &ctx->mech_src_name);

	    if (ctx->delegated_cred_id != GSS_C_NO_CREDENTIAL)
		_gss_spnego_release_cred(&minor, &ctx->delegated_cred_id);

	    ret = gss_accept_sec_context(&minor,
					 &ctx->negotiated_ctx_id,
					 mech_cred,
					 mech_input_token,
					 input_chan_bindings,
					 &ctx->mech_src_name,
					 &ctx->negotiated_mech_type,
					 &obuf,
					 &ctx->mech_flags,
					 &ctx->mech_time_rec,
					 mech_delegated_cred_p);
	    if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
		if (mech_delegated_cred_p != NULL &&
		    mech_delegated_cred != GSS_C_NO_CREDENTIAL) {
		    ret2 = _gss_spnego_alloc_cred(minor_status,
						  mech_delegated_cred,
						  &ctx->delegated_cred_id);
		    if (ret2 != GSS_S_COMPLETE)
			ret = ret2;
		}
		mech_output_token = &obuf;
	    }
	    if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
		free_NegotiationToken(&nt);
		gss_mg_collect_error(ctx->negotiated_mech_type, ret, minor);
		send_reject (minor_status, output_token);
		HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
		return ret;
	    }
	    if (ret == GSS_S_COMPLETE)
		ctx->open = 1;
	} else
	    ret = GSS_S_COMPLETE;

	ret2 = _gss_spnego_require_mechlist_mic(minor_status, 
						ctx,
						&require_mic);
	if (ret2)
	    goto out;

	ctx->require_mic = require_mic;

	mic = na->mechListMIC;
	if (mic != NULL)
	    require_mic = 1;

	if (ret == GSS_S_COMPLETE)
	    ret = acceptor_complete(minor_status,
				    ctx,
				    &get_mic,
				    &mech_buf,
				    mech_input_token,
				    mech_output_token,
				    na->mechListMIC,
				    output_token);

	if (ctx->mech_flags & GSS_C_DCE_STYLE)
	    require_response = (negResult != accept_completed);
	else
	    require_response = 0;

	/*
	 * Check whether we need to send a result: there should be only
	 * one accept_completed response sent in the entire negotiation
	 */
	if ((mech_output_token != GSS_C_NO_BUFFER &&
	     mech_output_token->length != 0)
	    || (ctx->open && negResult == accept_incomplete)
	    || require_response
	    || get_mic) {
	    ret2 = send_accept (minor_status,
				ctx,
				mech_output_token,
				0,
				get_mic ? &mech_buf : NULL,
				output_token);
	    if (ret2)
		goto out;
	}

     out:
	if (ret2 != GSS_S_COMPLETE)
	    ret = ret2;
	if (mech_output_token != NULL)
	    gss_release_buffer(&minor, mech_output_token);
	if (mech_buf.value != NULL)
	    free(mech_buf.value);
	free_NegotiationToken(&nt);
    }

    if (ret == GSS_S_COMPLETE) {
	if (src_name != NULL && ctx->mech_src_name != NULL) {
	    spnego_name name;

	    name = calloc(1, sizeof(*name));
	    if (name) {
		name->mech = ctx->mech_src_name;
		ctx->mech_src_name = NULL;
		*src_name = (gss_name_t)name;
	    }
	}
        if (delegated_cred_handle != NULL) {
	    *delegated_cred_handle = ctx->delegated_cred_id;
	    ctx->delegated_cred_id = GSS_C_NO_CREDENTIAL;
	}
    }

    if (mech_type != NULL)
	*mech_type = ctx->negotiated_mech_type;
    if (ret_flags != NULL)
	*ret_flags = ctx->mech_flags;
    if (time_rec != NULL)
	*time_rec = ctx->mech_time_rec;

    if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
	HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 	return ret;
    }

    _gss_spnego_internal_delete_sec_context(&minor, context_handle,
				   GSS_C_NO_BUFFER);

    return ret;
}

OM_uint32
_gss_spnego_accept_sec_context
	   (OM_uint32 * minor_status,
	    gss_ctx_id_t * context_handle,
	    const gss_cred_id_t acceptor_cred_handle,
	    const gss_buffer_t input_token_buffer,
	    const gss_channel_bindings_t input_chan_bindings,
	    gss_name_t * src_name,
	    gss_OID * mech_type,
	    gss_buffer_t output_token,
	    OM_uint32 * ret_flags,
	    OM_uint32 * time_rec,
	    gss_cred_id_t *delegated_cred_handle
	   )
{
    _gss_accept_sec_context_t *func;

    *minor_status = 0;

    output_token->length = 0;
    output_token->value  = NULL;

    if (src_name != NULL)
	*src_name = GSS_C_NO_NAME;
    if (mech_type != NULL)
	*mech_type = GSS_C_NO_OID;
    if (ret_flags != NULL)
	*ret_flags = 0;
    if (time_rec != NULL)
	*time_rec = 0;
    if (delegated_cred_handle != NULL)
	*delegated_cred_handle = GSS_C_NO_CREDENTIAL;


    if (*context_handle == GSS_C_NO_CONTEXT) 
	func = acceptor_start;
    else
	func = acceptor_continue;
    

    return (*func)(minor_status, context_handle, acceptor_cred_handle,
		   input_token_buffer, input_chan_bindings,
		   src_name, mech_type, output_token, ret_flags,
		   time_rec, delegated_cred_handle);
}