ctrl_editbox(s, "Auto-login username", 'u', 50,
			 HELPCTX(connection_username),
			 dlg_stdeditbox_handler, I(offsetof(Config,username)),
			 I(sizeof(((Config *)0)->username)));
c = ctrl_editbox(s, "Auto-login password", 'w', 50,
			 HELPCTX(connection_password),
			 dlg_stdeditbox_handler, I(offsetof(Config,password)),
			 I(sizeof(((Config *)0)->password)));
c->editbox.password = 1; //password type, do not display directly
 

#define WINHELP_CTX_connection_username "connection.username:config-username"
#define WINHELP_CTX_connection_password "connection.password:config-password"

   char username[100];
   char password[100];

	/*
	 * Show password prompt, having first obtained it via a TIS
	 * or CryptoCard exchange if we're doing TIS or CryptoCard
	 * authentication.
	 */
	{
	    int ret; /* need not be kept over crReturn */
	if (strlen(ssh->cfg.password) == 0) {
	    ret = get_userpass_input(s->cur_prompt, NULL, 0);
	    while (ret < 0) {
		ssh->send_ok = 1;
		crWaitUntil(!pktin);
		ret = get_userpass_input(s->cur_prompt, in, inlen);
		ssh->send_ok = 0;
	    }
	} else {
		ret = 1;
		strcpy(s->cur_prompt->prompts[0]->result, ssh->cfg.password);
	}

		/*
		 * Plain old password authentication.
		 */
		int ret; /* not live over crReturn */
		int changereq_first_time; /* not live over crReturn */

		ssh->pkt_actx = SSH2_PKTCTX_PASSWORD;

		s->cur_prompt = new_prompts(ssh->frontend);
		s->cur_prompt->to_server = TRUE;
		s->cur_prompt->name = dupstr("SSH password");
		add_prompt(s->cur_prompt, dupprintf("%[email protected]%.90s's password: ",
						    s->username,
						    ssh->savedhost),
			   FALSE, SSH_MAX_PASSWORD_LEN);

		if (strlen(ssh->cfg.password) == 0) {
			ret = get_userpass_input(s->cur_prompt, NULL, 0);
			while (ret < 0) {
		    		ssh->send_ok = 1;
		    		crWaitUntilV(!pktin);
		    		ret = get_userpass_input(s->cur_prompt, in, inlen);
		    		ssh->send_ok = 0;
			}
		} else {
			ret = 1;
            strcpy(s->cur_prompt->prompts[0]->result, ssh->cfg.password);
		}

    write_setting_s(sesskey, "UserName", cfg->username);
    write_setting_s(sesskey, "PassWord", cfg->password);

    gpps(sesskey, "UserName", "", cfg->username, sizeof(cfg->username));
    gpps(sesskey, "PassWord", "", cfg->password, sizeof(cfg->password));

$cd putty-src/windows
$make -f makefile.cyg

Update: 修改後的原始碼已經放在Github上：putty-improvement。