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/* $OpenBSD: cmd-server-access.c,v 1.3 2022/05/31 16:13:43 nicm Exp $ */
/*
* Copyright (c) 2021 Dallas Lyons <dallasdlyons@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/stat.h>
#include <sys/types.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "tmux.h"
/*
* Controls access to session.
*/
static enum cmd_retval cmd_server_access_exec(struct cmd *, struct cmdq_item *);
const struct cmd_entry cmd_server_access_entry = {
.name = "server-access",
.alias = NULL,
.args = { "adlrw", 0, 1, NULL },
.usage = "[-adlrw] " CMD_TARGET_PANE_USAGE " [user]",
.flags = CMD_CLIENT_CANFAIL,
.exec = cmd_server_access_exec
};
static enum cmd_retval
cmd_server_access_deny(struct cmdq_item *item, struct passwd *pw)
{
struct client *loop;
struct server_acl_user *user;
uid_t uid;
if ((user = server_acl_user_find(pw->pw_uid)) == NULL) {
cmdq_error(item, "user %s not found", pw->pw_name);
return (CMD_RETURN_ERROR);
}
TAILQ_FOREACH(loop, &clients, entry) {
uid = proc_get_peer_uid(loop->peer);
if (uid == server_acl_get_uid(user)) {
loop->exit_message = xstrdup("access not allowed");
loop->flags |= CLIENT_EXIT;
}
}
server_acl_user_deny(pw->pw_uid);
return (CMD_RETURN_NORMAL);
}
static enum cmd_retval
cmd_server_access_exec(struct cmd *self, struct cmdq_item *item)
{
struct args *args = cmd_get_args(self);
struct client *c = cmdq_get_target_client(item);
char *name;
struct passwd *pw = NULL;
if (args_has(args, 'l')) {
server_acl_display(item);
return (CMD_RETURN_NORMAL);
}
if (args_count(args) == 0) {
cmdq_error(item, "missing user argument");
return (CMD_RETURN_ERROR);
}
name = format_single(item, args_string(args, 0), c, NULL, NULL, NULL);
if (*name != '\0')
pw = getpwnam(name);
if (pw == NULL) {
cmdq_error(item, "unknown user: %s", name);
return (CMD_RETURN_ERROR);
}
free(name);
if (pw->pw_uid == 0 || pw->pw_uid == getuid()) {
cmdq_error(item, "%s owns the server, can't change access",
pw->pw_name);
return (CMD_RETURN_ERROR);
}
if (args_has(args, 'a') && args_has(args, 'd')) {
cmdq_error(item, "-a and -d cannot be used together");
return (CMD_RETURN_ERROR);
}
if (args_has(args, 'w') && args_has(args, 'r')) {
cmdq_error(item, "-r and -w cannot be used together");
return (CMD_RETURN_ERROR);
}
if (args_has(args, 'd'))
return (cmd_server_access_deny(item, pw));
if (args_has(args, 'a')) {
if (server_acl_user_find(pw->pw_uid) != NULL) {
cmdq_error(item, "user %s is already added",
pw->pw_name);
return (CMD_RETURN_ERROR);
}
server_acl_user_allow(pw->pw_uid);
/* Do not return - allow -r or -w with -a. */
} else if (args_has(args, 'r') || args_has(args, 'w')) {
/* -r or -w implies -a if user does not exist. */
if (server_acl_user_find(pw->pw_uid) == NULL)
server_acl_user_allow(pw->pw_uid);
}
if (args_has(args, 'w')) {
if (server_acl_user_find(pw->pw_uid) == NULL) {
cmdq_error(item, "user %s not found", pw->pw_name);
return (CMD_RETURN_ERROR);
}
server_acl_user_allow_write(pw->pw_uid);
return (CMD_RETURN_NORMAL);
}
if (args_has(args, 'r')) {
if (server_acl_user_find(pw->pw_uid) == NULL) {
cmdq_error(item, "user %s not found", pw->pw_name);
return (CMD_RETURN_ERROR);
}
server_acl_user_deny_write(pw->pw_uid);
return (CMD_RETURN_NORMAL);
}
return (CMD_RETURN_NORMAL);
}
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