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Add SUDO_TTY environment variable if the user has a tty

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This can be used to find the user's original tty device when sudo
runs the command in its own pty.  GitHub issue #447.
This commit is contained in:
Todd C. Miller 2025-06-07 16:20:37 -06:00
parent a925829e60
commit afd01d856b
3 changed files with 12 additions and 5 deletions
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7
docs/sudo.man.in
View File

@ -2,7 +2,7 @@
.\"
.\" SPDX-License-Identifier: ISC
.\"
.\" Copyright (c) 1994-1996, 1998-2005, 2007-2024
.\" Copyright (c) 1994-1996, 1998-2005, 2007-2025
.\" Todd C. Miller <Todd.Miller@sudo.ws>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
@ -25,7 +25,7 @@
.nr BA @BAMAN@
.nr LC @LCMAN@
.nr PS @PSMAN@
.TH "SUDO" "@mansectsu@" "December 20, 2024" "Sudo @PACKAGE_VERSION@" "System Manager's Manual"
.TH "SUDO" "@mansectsu@" "June 7, 2025" "Sudo @PACKAGE_VERSION@" "System Manager's Manual"
.nh
.if n .ad l
.SH "NAME"
@ -1436,6 +1436,9 @@ If set,
\fRPS1\fR
will be set to its value for the program being run.
.TP 17n
\fRSUDO_TTY\fR
Set to the terminal device of the user who invoked sudo, if one is present.
.TP 17n
\fRSUDO_UID\fR
Set to the user-ID of the user who invoked sudo.
.TP 17n

6
docs/sudo.mdoc.in
View File

@ -1,7 +1,7 @@
.\"
.\" SPDX-License-Identifier: ISC
.\"
.\" Copyright (c) 1994-1996, 1998-2005, 2007-2024
.\" Copyright (c) 1994-1996, 1998-2005, 2007-2025
.\" Todd C. Miller <Todd.Miller@sudo.ws>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
@ -24,7 +24,7 @@
.nr BA @BAMAN@
.nr LC @LCMAN@
.nr PS @PSMAN@
.Dd December 20, 2024
.Dd June 7, 2025
.Dt SUDO @mansectsu@
.Os Sudo @PACKAGE_VERSION@
.Sh NAME
@ -1355,6 +1355,8 @@ option was specified.
If set,
.Ev PS1
will be set to its value for the program being run.
.It Ev SUDO_TTY
Set to the terminal device of the user who invoked sudo, if one is present.
.It Ev SUDO_UID
Set to the user-ID of the user who invoked sudo.
.It Ev SUDO_USER

4
plugins/sudoers/env.c
View File

@ -1123,13 +1123,15 @@ rebuild_env(const struct sudoers_context *ctx)
CHECK_SETENV2("SUDO_COMMAND", ctx->user.cmnd, true, true);
}
/* Add the SUDO_{USER,UID,GID,HOME} environment variables. */
/* Add the SUDO_{USER,UID,GID,HOME,TTY,TTY} environment variables. */
CHECK_SETENV2("SUDO_USER", ctx->user.name, true, true);
(void)snprintf(idbuf, sizeof(idbuf), "%u", (unsigned int) ctx->user.uid);
CHECK_SETENV2("SUDO_UID", idbuf, true, true);
(void)snprintf(idbuf, sizeof(idbuf), "%u", (unsigned int) ctx->user.gid);
CHECK_SETENV2("SUDO_GID", idbuf, true, true);
CHECK_SETENV2("SUDO_HOME", ctx->user.pw->pw_dir, true, true);
if (ctx->user.ttypath != NULL)
CHECK_SETENV2("SUDO_TTY", ctx->user.ttypath, true, true);
debug_return_bool(true);