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pledge(2) for talk(1):

At the beginning the largest pledge is the following:

rpath: read ~/.terminfo (the reason was changed pointed out by semarie@)
inet/dns: talk may need to connect to a remote host and resolve it
getpw: if getlogin(2) fails then it needs getpwuid(3) as a fallback
tty: this is a typical tty application, so it'll always need this annotation

Then just before the application main loop check if the talk is with local user
so it only needs "stdio tty", if it's remote then it needs "stdio inet tty".
I couldn't test this with a remote host to confirm if it needs inet or not but
as per jca@'s comment "tighter settings - if possible - can happen later"

ok jca@ and also discussed with tb@

/*	$OpenBSD: talk.c,v 1.11 2016/02/05 10:18:01 mestre Exp $	*/
/*	$NetBSD: talk.c,v 1.3 1994/12/09 02:14:25 jtc Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <err.h>
#include <string.h>
#include <unistd.h>

#include "talk.h"
#include "talk_ctl.h"

/*
 * talk:	A visual form of write. Using sockets, a two way
 *		connection is set up between the two people talking.
 *		With the aid of curses, the screen is split into two
 *		windows, and each users text is added to the window,
 *		one character at a time...
 *
 *		Written by Kipp Hickman
 *		
 *		Modified to run under 4.1a by Clem Cole and Peter Moore
 *		Modified to run between hosts by Peter Moore, 8/19/82
 *		Modified to run under 4.1c by Peter Moore 3/17/83
 */

int
main(int argc, char *argv[])
{
	if (pledge("stdio rpath inet dns getpw tty", NULL) == -1)
		err(1, "pledge");

	get_names(argc, argv);
	init_display();
	open_ctl();
	open_sockt();
	start_msgs();
	if (!check_local())
		invite_remote();
	end_msgs();
	set_edit_chars();

	if (his_machine_addr.s_addr == my_machine_addr.s_addr) {
		if (pledge("stdio tty", NULL) == -1)
			err(1, "pledge");
	} else {
		if (pledge("stdio tty", NULL) == -1)
			err(1, "pledge");
	}

	talk();
	return (0);
}