release fixes
. make ramdisk buildable without ../etc having pwd.db . add cat to release bootstrap cmds . support running dynamically linked executables for release bootstrap cmds . import netbsd chroot to help
This commit is contained in:
Ben Gras
@@ -0,0 +1,7 @@
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# from: @(#)Makefile 8.1 (Berkeley) 6/6/93
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# $NetBSD: Makefile,v 1.6 2009/04/22 15:23:02 lukem Exp $
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PROG= chroot
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MAN= chroot.8
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.include <bsd.prog.mk>
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@@ -0,0 +1,100 @@
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.\" $NetBSD: chroot.8,v 1.14 2011/08/15 14:43:17 wiz Exp $
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.\"
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.\" Copyright (c) 1988, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)chroot.8 8.1 (Berkeley) 6/9/93
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.\"
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.Dd August 13, 2011
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.Dt CHROOT 8
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.Os
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.Sh NAME
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.Nm chroot
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.Nd change root directory
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.Sh SYNOPSIS
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.Nm
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.Op Fl G Ar group,group,...
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.Op Fl g Ar group
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.Op Fl u Ar user
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.Ar newroot
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.Op Ar command
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.Sh DESCRIPTION
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The
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.Nm
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command changes its root directory to the supplied directory
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.Ar newroot
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and exec's
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.Ar command ,
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or, if not supplied, an interactive copy of your shell.
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.Pp
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If the
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.Fl u ,
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.Fl g ,
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or
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.Fl G
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options are given, the user, group, and group list of the process are
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set to these values after the chroot has taken place; see
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.Xr setgid 2 ,
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.Xr setgroups 2 ,
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.Xr setuid 2 ,
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.Xr getgrnam 3 ,
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and
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.Xr getpwnam 3 .
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.Pp
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Note:
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.Ar command
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or the shell are run as your real-user-id.
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.Sh ENVIRONMENT
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The following environment variable is referenced by
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.Nm :
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.Bl -tag -width SHELL
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.It Ev SHELL
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If set,
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the string specified by
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.Ev SHELL
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is interpreted as the name of
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the shell to exec.
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If the variable
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.Ev SHELL
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is not set,
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.Pa /bin/sh
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is used.
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.El
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.Sh SEE ALSO
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.Xr ldd 1 ,
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.Xr chdir 2 ,
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.Xr chroot 2 ,
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.Xr environ 7
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Bx 4.4 .
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.Sh SECURITY CONSIDERATIONS
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.Nm
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should never be installed setuid root, as it would then be possible
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to exploit the program to gain root privileges.
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@@ -0,0 +1,205 @@
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/* $NetBSD: chroot.c,v 1.19 2011/09/20 14:28:52 christos Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1988, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)chroot.c 8.1 (Berkeley) 6/9/93";
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#else
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__RCSID("$NetBSD: chroot.c,v 1.19 2011/09/20 14:28:52 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <string.h>
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#include <unistd.h>
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static void usage(void) __dead;
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static int
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getnum(const char *str, uintmax_t *num)
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{
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char *ep;
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errno = 0;
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*num = strtoumax(str, &ep, 0);
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if (str[0] == '\0' || *ep != '\0') {
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errno = EINVAL;
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return -1;
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}
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if (errno == ERANGE && *num == UINTMAX_MAX)
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return -1;
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return 0;
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}
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static gid_t
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getgroup(const char *group)
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{
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uintmax_t num;
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struct group *gp;
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if ((gp = getgrnam(group)) != NULL)
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return gp->gr_gid;
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if (getnum(group, &num) == -1)
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errx(1, "no such group `%s'", group);
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return (gid_t)num;
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}
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static uid_t
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getuser(const char *user)
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{
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uintmax_t num;
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struct passwd *pw;
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if ((pw = getpwnam(user)) != NULL)
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return pw->pw_uid;
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if (getnum(user, &num) == -1)
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errx(1, "no such user `%s'", user);
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return (uid_t)num;
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}
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int
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main(int argc, char *argv[])
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{
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char *user; /* user to switch to before running program */
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char *group; /* group to switch to ... */
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char *grouplist; /* group list to switch to ... */
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char *p;
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const char *shell;
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gid_t gid, gidlist[NGROUPS_MAX];
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uid_t uid;
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int ch, gids;
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user = NULL;
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group = NULL;
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grouplist = NULL;
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gid = 0;
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uid = 0;
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gids = 0;
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while ((ch = getopt(argc, argv, "G:g:u:")) != -1) {
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switch(ch) {
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case 'u':
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user = optarg;
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if (*user == '\0')
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usage();
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break;
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case 'g':
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group = optarg;
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if (*group == '\0')
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usage();
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break;
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case 'G':
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grouplist = optarg;
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if (*grouplist == '\0')
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usage();
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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if (user != NULL)
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uid = getuser(user);
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if (group != NULL)
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gid = getgroup(group);
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if (grouplist != NULL) {
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while ((p = strsep(&grouplist, ",")) != NULL) {
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if (*p == '\0')
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continue;
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if (gids == NGROUPS_MAX)
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errx(1,
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"too many supplementary groups provided");
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gidlist[gids++] = getgroup(p);
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}
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}
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if (chdir(argv[0]) == -1 || chroot(".") == -1)
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err(1, "%s", argv[0]);
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if (gids && setgroups(gids, gidlist) == -1)
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err(1, "setgroups");
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if (group && setgid(gid) == -1)
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err(1, "setgid");
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if (user && setuid(uid) == -1)
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err(1, "setuid");
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if (argv[1]) {
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execvp(argv[1], &argv[1]);
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err(1, "%s", argv[1]);
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}
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if ((shell = getenv("SHELL")) == NULL)
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shell = _PATH_BSHELL;
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execlp(shell, shell, "-i", NULL);
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err(1, "%s", shell);
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/* NOTREACHED */
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "Usage: %s [-G group,group,...] [-g group] "
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"[-u user] newroot [command]\n", getprogname());
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exit(1);
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}
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