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/* $OpenBSD: cmd-server-access.c,v 1.6 2026/06/09 12:58:40 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
<grp.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
=
{
"adglrw"
,
0
,
1
,
NULL
},
.
usage
=
"[-adglrw] "
CMD_TARGET_PANE_USAGE
" [user|group]"
,
.
flags
=
CMD_CLIENT_CANFAIL
,
.
exec
=
cmd_server_access_exec
};
static
enum
cmd_retval
cmd_server_access_deny
(
struct
cmdq_item
*
item
,
id_t
id
,
int
flags
,
const
char
*
type
,
const
char
*
name
)
{
if
(!
server_acl_find
(
id
,
flags
)) {
cmdq_error
(
item
,
"%s %s not found"
,
type
,
name
);
return
(
CMD_RETURN_ERROR
);
}
server_acl_deny
(
id
,
flags
);
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
*
arg
;
const
char
*
name
=
NULL
,
*
type
;
struct
passwd
*
pw
;
struct
group
*
gr
;
id_t
id
;
int
flags
=
0
;
if
(
args_has
(
args
,
'l'
)) {
server_acl_display
(
item
);
return
(
CMD_RETURN_NORMAL
);
}
if
(
args_count
(
args
)
==
0
) {
cmdq_error
(
item
,
"missing user or group argument"
);
return
(
CMD_RETURN_ERROR
);
}
arg
=
format_single
(
item
,
args_string
(
args
,
0
),
c
,
NULL
,
NULL
,
NULL
);
if
(
args_has
(
args
,
'g'
)) {
type
=
"group"
;
if
((
gr
=
getgrnam
(
arg
))
!=
NULL
) {
id
=
gr
->
gr_gid
;
name
=
gr
->
gr_name
;
flags
|=
SERVER_ACL_IS_GROUP
;
}
}
else
{
type
=
"user"
;
if
((
pw
=
getpwnam
(
arg
))
!=
NULL
) {
id
=
pw
->
pw_uid
;
name
=
pw
->
pw_name
;
}
}
if
(
name
==
NULL
) {
cmdq_error
(
item
,
"unknown %s: %s"
,
type
,
arg
);
free
(
arg
);
return
(
CMD_RETURN_ERROR
);
}
free
(
arg
);
if
((~
flags
&
SERVER_ACL_IS_GROUP
)
&&
(
id
==
0
||
id
==
getuid
())) {
cmdq_error
(
item
,
"%s owns the server, can't change access"
,
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
,
id
,
flags
,
type
,
name
));
if
(
args_has
(
args
,
'a'
)) {
if
(
server_acl_find
(
id
,
flags
)) {
cmdq_error
(
item
,
"%s %s is already added"
,
type
,
name
);
return
(
CMD_RETURN_ERROR
);
}
server_acl_allow
(
id
,
flags
);
/* 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 the entry does not exist. */
if
(!
server_acl_find
(
id
,
flags
))
server_acl_allow
(
id
,
flags
);
}
if
(
args_has
(
args
,
'w'
)) {
if
(!
server_acl_find
(
id
,
flags
)) {
cmdq_error
(
item
,
"%s %s not found"
,
type
,
name
);
return
(
CMD_RETURN_ERROR
);
}
server_acl_allow_write
(
id
,
flags
);
return
(
CMD_RETURN_NORMAL
);
}
if
(
args_has
(
args
,
'r'
)) {
if
(!
server_acl_find
(
id
,
flags
)) {
cmdq_error
(
item
,
"%s %s not found"
,
type
,
name
);
return
(
CMD_RETURN_ERROR
);
}
server_acl_deny_write
(
id
,
flags
);
return
(
CMD_RETURN_NORMAL
);
}
return
(
CMD_RETURN_NORMAL
);
}
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