auth.c

samba最新软件

/* 
   Unix SMB/CIFS implementation.
   Password and authentication handling
   Copyright (C) Andrew Bartlett         2001-2002
   Copyright (C) Stefan Metzmacher       2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program 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 General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "lib/util/dlinklist.h"
#include "auth/auth.h"
#include "auth/ntlm/auth_proto.h"
#include "lib/events/events.h"
#include "param/param.h"

/***************************************************************************
 Set a fixed challenge
***************************************************************************/
_PUBLIC_ NTSTATUS auth_context_set_challenge(struct auth_context *auth_ctx, const uint8_t chal[8], const char *set_by) 
{
	auth_ctx->challenge.set_by = talloc_strdup(auth_ctx, set_by);
	NT_STATUS_HAVE_NO_MEMORY(auth_ctx->challenge.set_by);

	auth_ctx->challenge.data = data_blob_talloc(auth_ctx, chal, 8);
	NT_STATUS_HAVE_NO_MEMORY(auth_ctx->challenge.data.data);

	return NT_STATUS_OK;
}

/***************************************************************************
 Set a fixed challenge
***************************************************************************/
bool auth_challenge_may_be_modified(struct auth_context *auth_ctx) 
{
	return auth_ctx->challenge.may_be_modified;
}

/****************************************************************************
 Try to get a challenge out of the various authentication modules.
 Returns a const char of length 8 bytes.
****************************************************************************/
_PUBLIC_ NTSTATUS auth_get_challenge(struct auth_context *auth_ctx, const uint8_t **_chal)
{
	NTSTATUS nt_status;
	struct auth_method_context *method;

	if (auth_ctx->challenge.data.length) {
		DEBUG(5, ("auth_get_challenge: returning previous challenge by module %s (normal)\n", 
			  auth_ctx->challenge.set_by));
		*_chal = auth_ctx->challenge.data.data;
		return NT_STATUS_OK;
	}

	for (method = auth_ctx->methods; method; method = method->next) {
		DATA_BLOB challenge = data_blob(NULL,0);

		nt_status = method->ops->get_challenge(method, auth_ctx, &challenge);
		if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NOT_IMPLEMENTED)) {
			continue;
		}

		NT_STATUS_NOT_OK_RETURN(nt_status);

		if (challenge.length != 8) {
			DEBUG(0, ("auth_get_challenge: invalid challenge (length %u) by mothod [%s]\n",
				(unsigned)challenge.length, method->ops->name));
			return NT_STATUS_INTERNAL_ERROR;
		}

		auth_ctx->challenge.data	= challenge;
		auth_ctx->challenge.set_by	= method->ops->name;

		break;
	}

	if (!auth_ctx->challenge.set_by) {
		uint8_t chal[8];
		generate_random_buffer(chal, 8);

		auth_ctx->challenge.data		= data_blob_talloc(auth_ctx, chal, 8);
		NT_STATUS_HAVE_NO_MEMORY(auth_ctx->challenge.data.data);
		auth_ctx->challenge.set_by		= "random";

		auth_ctx->challenge.may_be_modified	= true;
	}

	DEBUG(10,("auth_get_challenge: challenge set by %s\n",
		 auth_ctx->challenge.set_by));

	*_chal = auth_ctx->challenge.data.data;
	return NT_STATUS_OK;
}

struct auth_check_password_sync_state {
	bool finished;
	NTSTATUS status;
	struct auth_serversupplied_info *server_info;
};

static void auth_check_password_sync_callback(struct auth_check_password_request *req,
					      void *private_data)
{
	struct auth_check_password_sync_state *s = talloc_get_type(private_data,
						   struct auth_check_password_sync_state);

	s->finished = true;
	s->status = auth_check_password_recv(req, s, &s->server_info);
}

/**
 * Check a user's Plaintext, LM or NTLM password.
 * (sync version)
 *
 * Check a user's password, as given in the user_info struct and return various
 * interesting details in the server_info struct.
 *
 * The return value takes precedence over the contents of the server_info 
 * struct.  When the return is other than NT_STATUS_OK the contents 
 * of that structure is undefined.
 *
 * @param auth_ctx Supplies the challenges and some other data. 
 *                  Must be created with auth_context_create(), and the challenges should be 
 *                  filled in, either at creation or by calling the challenge geneation 
 *                  function auth_get_challenge().  
 *
 * @param user_info Contains the user supplied components, including the passwords.
 *
 * @param mem_ctx The parent memory context for the server_info structure
 *
 * @param server_info If successful, contains information about the authentication, 
 *                    including a SAM_ACCOUNT struct describing the user.
 *
 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
 *
 **/

_PUBLIC_ NTSTATUS auth_check_password(struct auth_context *auth_ctx,
			     TALLOC_CTX *mem_ctx,
			     const struct auth_usersupplied_info *user_info, 
			     struct auth_serversupplied_info **server_info)
{
	struct auth_check_password_sync_state *sync_state;
	NTSTATUS status;

	sync_state = talloc_zero(auth_ctx, struct auth_check_password_sync_state);
	NT_STATUS_HAVE_NO_MEMORY(sync_state);

	auth_check_password_send(auth_ctx, user_info, auth_check_password_sync_callback, sync_state);

	while (!sync_state->finished) {
		event_loop_once(auth_ctx->event_ctx);
	}

	status = sync_state->status;

	if (NT_STATUS_IS_OK(status)) {
		*server_info = talloc_steal(mem_ctx, sync_state->server_info);
	}

	talloc_free(sync_state);
	return status;
}

struct auth_check_password_request {
	struct auth_context *auth_ctx;
	const struct auth_usersupplied_info *user_info;
	struct auth_serversupplied_info *server_info;
	struct auth_method_context *method;
	NTSTATUS status;
	struct {
		void (*fn)(struct auth_check_password_request *req, void *private_data);
		void *private_data;
	} callback;
};

static void auth_check_password_async_timed_handler(struct event_context *ev, struct timed_event *te,
						    struct timeval t, void *ptr)
{
	struct auth_check_password_request *req = talloc_get_type(ptr, struct auth_check_password_request);
	req->status = req->method->ops->check_password(req->method, req, req->user_info, &req->server_info);
	req->callback.fn(req, req->callback.private_data);
}

/**
 * Check a user's Plaintext, LM or NTLM password.
 * async send hook
 *
 * Check a user's password, as given in the user_info struct and return various
 * interesting details in the server_info struct.
 *
 * The return value takes precedence over the contents of the server_info 
 * struct.  When the return is other than NT_STATUS_OK the contents 
 * of that structure is undefined.
 *
 * @param auth_ctx Supplies the challenges and some other data. 
 *                  Must be created with make_auth_context(), and the challenges should be 
 *                  filled in, either at creation or by calling the challenge geneation 
 *                  function auth_get_challenge().  
 *
 * @param user_info Contains the user supplied components, including the passwords.
 *
 * @param callback A callback function which will be called when the operation is finished.
 *                 The callback function needs to call auth_check_password_recv() to get the return values
 *
 * @param private_data A private pointer which will ba passed to the callback function
 *
 **/

_PUBLIC_ void auth_check_password_send(struct auth_context *auth_ctx,
			      const struct auth_usersupplied_info *user_info,
			      void (*callback)(struct auth_check_password_request *req, void *private_data),
			      void *private_data)
{
	/* if all the modules say 'not for me' this is reasonable */
	NTSTATUS nt_status;
	struct auth_method_context *method;
	const uint8_t *challenge;
	struct auth_usersupplied_info *user_info_tmp;
	struct auth_check_password_request *req = NULL;

	DEBUG(3,   ("auth_check_password_send:  Checking password for unmapped user [%s]\\[%s]@[%s]\n", 
		    user_info->client.domain_name, user_info->client.account_name, user_info->workstation_name));

	req = talloc_zero(auth_ctx, struct auth_check_password_request);
	if (!req) {
		callback(NULL, private_data);
		return;
	}
	req->auth_ctx			= auth_ctx;
	req->user_info			= user_info;
	req->callback.fn		= callback;
	req->callback.private_data	= private_data;

	if (!user_info->mapped_state) {
		nt_status = map_user_info(req, lp_workgroup(auth_ctx->lp_ctx), user_info, &user_info_tmp);
		if (!NT_STATUS_IS_OK(nt_status)) goto failed;
		user_info = user_info_tmp;
		req->user_info	= user_info_tmp;
	}

	DEBUGADD(3,("auth_check_password_send:  mapped user is: [%s]\\[%s]@[%s]\n", 
		    user_info->mapped.domain_name, user_info->mapped.account_name, user_info->workstation_name));

	nt_status = auth_get_challenge(auth_ctx, &challenge);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(0, ("auth_check_password_send:  Invalid challenge (length %u) stored for this auth context set_by %s - cannot continue: %s\n",
			(unsigned)auth_ctx->challenge.data.length, auth_ctx->challenge.set_by, nt_errstr(nt_status)));
		goto failed;
	}

	if (auth_ctx->challenge.set_by) {
		DEBUG(10, ("auth_check_password_send: auth_context challenge created by %s\n",
					auth_ctx->challenge.set_by));
	}

	DEBUG(10, ("auth_check_password_send: challenge is: \n"));
	dump_data(5, auth_ctx->challenge.data.data, auth_ctx->challenge.data.length);