Add -u and -U which functions like the jail(8) that allow
commands to be executed under a different credential. PR: bin/95777 Submitted by: clsung
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commit
70b75adf82
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=157864
@ -2,6 +2,8 @@
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PROG= jexec
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MAN= jexec.8
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DPADD= ${LIBUTIL}
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LDADD= -lutil
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WARNS?= 6
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.include <bsd.prog.mk>
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@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 8, 2003
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.Dd April 19, 2006
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.Dt JEXEC 8
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.Os
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.Sh NAME
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@ -33,6 +33,7 @@
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.Nd "execute a command inside an existing jail"
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.Sh SYNOPSIS
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.Nm
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.Op Fl u Ar username | Fl U Ar username
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.Ar jid command ...
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.Sh DESCRIPTION
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The
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@ -41,6 +42,17 @@ utility executes
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.Ar command
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inside the jail identified by
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.Ar jid .
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl u Ar username
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The user name from host environment as whom the
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.Ar command
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should run.
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.It Fl U Ar username
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The user name from jailed environment as whom the
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.Ar command
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should run.
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.Sh SEE ALSO
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.Xr jail_attach 2 ,
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.Xr jail 8 ,
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@ -30,26 +30,84 @@
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#include <sys/jail.h>
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#include <err.h>
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#include <errno.h>
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#include <login_cap.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <pwd.h>
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#include <unistd.h>
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static void usage(void);
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#define GET_USER_INFO do { \
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pwd = getpwnam(username); \
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if (pwd == NULL) { \
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if (errno) \
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err(1, "getpwnam: %s", username); \
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else \
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errx(1, "%s: no such user", username); \
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} \
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lcap = login_getpwclass(pwd); \
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if (lcap == NULL) \
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err(1, "getpwclass: %s", username); \
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ngroups = NGROUPS; \
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if (getgrouplist(username, pwd->pw_gid, groups, &ngroups) != 0) \
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err(1, "getgrouplist: %s", username); \
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} while (0)
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int
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main(int argc, char *argv[])
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{
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int jid;
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login_cap_t *lcap = NULL;
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struct passwd *pwd = NULL;
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gid_t groups[NGROUPS];
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int ch, ngroups, uflag, Uflag;
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char *username;
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ch = uflag = Uflag = 0;
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username = NULL;
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if (argc < 3)
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while ((ch = getopt(argc, argv, "u:U:")) != -1) {
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switch (ch) {
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case 'u':
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username = optarg;
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uflag = 1;
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break;
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case 'U':
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username = optarg;
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Uflag = 1;
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break;
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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 < 2)
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usage();
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jid = (int)strtol(argv[1], NULL, 10);
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if (uflag && Uflag)
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usage();
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if (uflag)
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GET_USER_INFO;
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jid = (int)strtol(argv[0], NULL, 10);
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if (jail_attach(jid) == -1)
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err(1, "jail_attach(): %d", jid);
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if (chdir("/") == -1)
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err(1, "chdir(): /");
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if (execvp(argv[2], argv + 2) == -1)
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err(1, "execvp(): %s", argv[2]);
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if (username != NULL) {
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if (Uflag)
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GET_USER_INFO;
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if (setgroups(ngroups, groups) != 0)
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err(1, "setgroups");
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if (setgid(pwd->pw_gid) != 0)
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err(1, "setgid");
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if (setusercontext(lcap, pwd, pwd->pw_uid,
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LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN) != 0)
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err(1, "setusercontext");
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login_close(lcap);
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}
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if (execvp(argv[1], argv + 1) == -1)
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err(1, "execvp(): %s", argv[1]);
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exit(0);
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}
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@ -57,6 +115,8 @@ static void
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usage(void)
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{
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fprintf(stderr, "usage: jexec jid command [...]\n");
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fprintf(stderr, "%s%s\n",
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"usage: jexec [-u username | -U username]",
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" jid command [...]");
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exit(1);
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}
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