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Add -u and -U which functions like the jail(8) that allow

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commands to be executed under a different credential.

PR:		bin/95777
Submitted by:	clsung
This commit is contained in:
Xin LI 2006-04-19 10:12:10 +00:00
parent 2652af563e
commit 70b75adf82
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=157864
3 changed files with 80 additions and 6 deletions
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2
usr.sbin/jexec/Makefile
View File

@ -2,6 +2,8 @@
PROG= jexec
MAN= jexec.8
DPADD= ${LIBUTIL}
LDADD= -lutil
WARNS?= 6
.include <bsd.prog.mk>

14
usr.sbin/jexec/jexec.8
View File

@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd April 8, 2003
.Dd April 19, 2006
.Dt JEXEC 8
.Os
.Sh NAME
@ -33,6 +33,7 @@
.Nd "execute a command inside an existing jail"
.Sh SYNOPSIS
.Nm
.Op Fl u Ar username | Fl U Ar username
.Ar jid command ...
.Sh DESCRIPTION
The
@ -41,6 +42,17 @@ utility executes
.Ar command
inside the jail identified by
.Ar jid .
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl u Ar username
The user name from host environment as whom the
.Ar command
should run.
.It Fl U Ar username
The user name from jailed environment as whom the
.Ar command
should run.
.Sh SEE ALSO
.Xr jail_attach 2 ,
.Xr jail 8 ,

70
usr.sbin/jexec/jexec.c
View File

@ -30,26 +30,84 @@
#include <sys/jail.h>
#include <err.h>
#include <errno.h>
#include <login_cap.h>
#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>
#include <unistd.h>
static void usage(void);
#define GET_USER_INFO do { \
pwd = getpwnam(username); \
if (pwd == NULL) { \
if (errno) \
err(1, "getpwnam: %s", username); \
else \
errx(1, "%s: no such user", username); \
} \
lcap = login_getpwclass(pwd); \
if (lcap == NULL) \
err(1, "getpwclass: %s", username); \
ngroups = NGROUPS; \
if (getgrouplist(username, pwd->pw_gid, groups, &ngroups) != 0) \
err(1, "getgrouplist: %s", username); \
} while (0)
int
main(int argc, char *argv[])
{
int jid;
login_cap_t *lcap = NULL;
struct passwd *pwd = NULL;
gid_t groups[NGROUPS];
int ch, ngroups, uflag, Uflag;
char *username;
ch = uflag = Uflag = 0;
username = NULL;
if (argc < 3)
while ((ch = getopt(argc, argv, "u:U:")) != -1) {
switch (ch) {
case 'u':
username = optarg;
uflag = 1;
break;
case 'U':
username = optarg;
Uflag = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
jid = (int)strtol(argv[1], NULL, 10);
if (uflag && Uflag)
usage();
if (uflag)
GET_USER_INFO;
jid = (int)strtol(argv[0], NULL, 10);
if (jail_attach(jid) == -1)
err(1, "jail_attach(): %d", jid);
if (chdir("/") == -1)
err(1, "chdir(): /");
if (execvp(argv[2], argv + 2) == -1)
err(1, "execvp(): %s", argv[2]);
if (username != NULL) {
if (Uflag)
GET_USER_INFO;
if (setgroups(ngroups, groups) != 0)
err(1, "setgroups");
if (setgid(pwd->pw_gid) != 0)
err(1, "setgid");
if (setusercontext(lcap, pwd, pwd->pw_uid,
LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN) != 0)
err(1, "setusercontext");
login_close(lcap);
}
if (execvp(argv[1], argv + 1) == -1)
err(1, "execvp(): %s", argv[1]);
exit(0);
}
@ -57,6 +115,8 @@ static void
usage(void)
{
fprintf(stderr, "usage: jexec jid command [...]\n");
fprintf(stderr, "%s%s\n",
"usage: jexec [-u username | -U username]",
" jid command [...]");
exit(1);
}