auth.c

来自「samba-3.0.22.tar.gz 编译smb服务器的源码」· C语言 代码 · 共 540 行 · 第 1/2 页

				  auth_method->name, user_info->smb_name.str, nt_errstr(nt_status)));
		}

		talloc_destroy(mem_ctx);

		if ( NT_STATUS_IS_OK(nt_status))
		{
				break;			
		}
	}

	/* successful authentication */
	
	if (NT_STATUS_IS_OK(nt_status)) {
		unix_username = (*server_info)->unix_name;
		if (!(*server_info)->guest) {
			/* We might not be root if we are an RPC call */
			become_root();
			nt_status = smb_pam_accountcheck(unix_username);
			unbecome_root();
			
			if (NT_STATUS_IS_OK(nt_status)) {
				DEBUG(5, ("check_ntlm_password:  PAM Account for user [%s] succeeded\n", 
					  unix_username));
			} else {
				DEBUG(3, ("check_ntlm_password:  PAM Account for user [%s] FAILED with error %s\n", 
					  unix_username, nt_errstr(nt_status)));
			} 
		}
		
		if (NT_STATUS_IS_OK(nt_status)) {
			DEBUG((*server_info)->guest ? 5 : 2, 
			      ("check_ntlm_password:  %sauthentication for user [%s] -> [%s] -> [%s] succeeded\n", 
			       (*server_info)->guest ? "guest " : "", 
			       user_info->smb_name.str, 
			       user_info->internal_username.str, 
			       unix_username));
		}
		
		return nt_status;
	}
	
	/* failed authentication; check for guest lapping */
	
	DEBUG(2, ("check_ntlm_password:  Authentication for user [%s] -> [%s] FAILED with error %s\n", 
  	user_info->smb_name.str, user_info->internal_username.str, 
  	nt_errstr(nt_status)));
	ZERO_STRUCTP(server_info); 
	
	return nt_status;
}

/***************************************************************************
 Clear out a auth_context, and destroy the attached TALLOC_CTX
***************************************************************************/

static void free_auth_context(struct auth_context **auth_context)
{
	auth_methods *auth_method;

	if (*auth_context) {
		/* Free private data of context's authentication methods */
		for (auth_method = (*auth_context)->auth_method_list; auth_method; auth_method = auth_method->next) {
			if (auth_method->free_private_data) {
				auth_method->free_private_data (&auth_method->private_data);
				auth_method->private_data = NULL;
			}
		}

		talloc_destroy((*auth_context)->mem_ctx);
		*auth_context = NULL;
	}
}

/***************************************************************************
 Make a auth_info struct
***************************************************************************/

static NTSTATUS make_auth_context(struct auth_context **auth_context) 
{
	TALLOC_CTX *mem_ctx;

	mem_ctx = talloc_init("authentication context");
	
	*auth_context = TALLOC_P(mem_ctx, struct auth_context);
	if (!*auth_context) {
		DEBUG(0,("make_auth_context: talloc failed!\n"));
		talloc_destroy(mem_ctx);
		return NT_STATUS_NO_MEMORY;
	}
	ZERO_STRUCTP(*auth_context);

	(*auth_context)->mem_ctx = mem_ctx;
	(*auth_context)->check_ntlm_password = check_ntlm_password;
	(*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
	(*auth_context)->free = free_auth_context;
	
	return NT_STATUS_OK;
}

BOOL load_auth_module(struct auth_context *auth_context, 
		      const char *module, auth_methods **ret) 
{
	static BOOL initialised_static_modules = False;

	struct auth_init_function_entry *entry;
	char *module_name = smb_xstrdup(module);
	char *module_params = NULL;
	char *p;
	BOOL good = False;

	/* Initialise static modules if not done so yet */
	if(!initialised_static_modules) {
		static_init_auth;
		initialised_static_modules = True;
	}
	
	DEBUG(5,("load_auth_module: Attempting to find an auth method to match %s\n",
		 module));
	
	p = strchr(module_name, ':');
	if (p) {
		*p = 0;
		module_params = p+1;
		trim_char(module_params, ' ', ' ');
	}
	
	trim_char(module_name, ' ', ' ');
	
	entry = auth_find_backend_entry(module_name);
	
	if (entry == NULL) {
		if (NT_STATUS_IS_OK(smb_probe_module("auth", module_name))) {
			entry = auth_find_backend_entry(module_name);
		}
	}

	if (entry != NULL) {
		if (!NT_STATUS_IS_OK(entry->init(auth_context, module_params, ret))) {
			DEBUG(0,("load_auth_module: auth method %s did not correctly init\n",
				 module_name));
		} else {
			DEBUG(5,("load_auth_module: auth method %s has a valid init\n",
				 module_name));
			good = True;
		}
	} else {
		DEBUG(0,("load_auth_module: can't find auth method %s!\n", module_name));
	}

	SAFE_FREE(module_name);
	return good;
}

/***************************************************************************
 Make a auth_info struct for the auth subsystem
***************************************************************************/

static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list) 
{
	auth_methods *list = NULL;
	auth_methods *t = NULL;
	auth_methods *tmp;
	NTSTATUS nt_status;

	if (!text_list) {
		DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
		return NT_STATUS_UNSUCCESSFUL;
	}
	
	if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context)))
		return nt_status;

	for (;*text_list; text_list++) { 
		if (load_auth_module(*auth_context, *text_list, &t)) {
		    DLIST_ADD_END(list, t, tmp);
		}
	}
	
	(*auth_context)->auth_method_list = list;
	
	return nt_status;
}

/***************************************************************************
 Make a auth_context struct for the auth subsystem
***************************************************************************/

NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context) 
{
	char **auth_method_list = NULL; 
	NTSTATUS nt_status;

	if (lp_auth_methods() && !str_list_copy(&auth_method_list, lp_auth_methods())) {
		return NT_STATUS_NO_MEMORY;
	}

	if (auth_method_list == NULL) {
		switch (lp_security()) 
		{
		case SEC_DOMAIN:
			DEBUG(5,("Making default auth method list for security=domain\n"));
			auth_method_list = str_list_make("guest sam winbind:ntdomain", NULL);
			break;
		case SEC_SERVER:
			DEBUG(5,("Making default auth method list for security=server\n"));
			auth_method_list = str_list_make("guest sam smbserver", NULL);
			break;
		case SEC_USER:
			if (lp_encrypted_passwords()) {	
				if ((lp_server_role() == ROLE_DOMAIN_PDC) || (lp_server_role() == ROLE_DOMAIN_BDC)) {
					DEBUG(5,("Making default auth method list for DC, security=user, encrypt passwords = yes\n"));
					auth_method_list = str_list_make("guest sam winbind:trustdomain", NULL);
				} else {
					DEBUG(5,("Making default auth method list for standalone security=user, encrypt passwords = yes\n"));
					auth_method_list = str_list_make("guest sam", NULL);
				}
			} else {
				DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
				auth_method_list = str_list_make("guest unix", NULL);
			}
			break;
		case SEC_SHARE:
			if (lp_encrypted_passwords()) {
				DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
				auth_method_list = str_list_make("guest sam", NULL);
			} else {
				DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
				auth_method_list = str_list_make("guest unix", NULL);
			}
			break;
		case SEC_ADS:
			DEBUG(5,("Making default auth method list for security=ADS\n"));
			auth_method_list = str_list_make("guest sam winbind:ntdomain", NULL);
			break;
		default:
			DEBUG(5,("Unknown auth method!\n"));
			return NT_STATUS_UNSUCCESSFUL;
		}
	} else {
		DEBUG(5,("Using specified auth order\n"));
	}
	
	if (!NT_STATUS_IS_OK(nt_status = make_auth_context_text_list(auth_context, auth_method_list))) {
		str_list_free(&auth_method_list);
		return nt_status;
	}
	
	str_list_free(&auth_method_list);
	return nt_status;
}

/***************************************************************************
 Make a auth_info struct with a fixed challenge
***************************************************************************/

NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uchar chal[8]) 
{
	NTSTATUS nt_status;
	if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
		return nt_status;
	}
	
	(*auth_context)->challenge = data_blob_talloc((*auth_context)->mem_ctx, chal, 8);
	(*auth_context)->challenge_set_by = "fixed";
	return nt_status;
}