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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2014 Gary Mills
* Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* New implementation of pfexec(1) and all of the profile shells.
*
* The algorithm is as follows:
* first try to derive the shell's path from getexecname();
* note that this requires a *hard* link to the program, so
* if we find that we are actually executing pfexec, we start
* looking at argv[0].
* argv[0] is also our fallback in case getexecname doesn't find it.
*/
#include <sys/param.h>
#include <alloca.h>
#include <errno.h>
#include <locale.h>
#include <priv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define PFEXEC "pfexec"
#ifndef TEXT_DOMAIN
#define TEXT_DOMAIN "SYS_TEST"
#endif
#define RES_PFEXEC 1
#define RES_OK 0
#define RES_FAILURE -1
/*
* Return the shellname
*/
int
shellname(const char *name, char buf[MAXPATHLEN])
{
const char *cmd = strrchr(name, '/');
if (cmd == NULL)
cmd = name;
else
cmd++;
if (strncmp(cmd, "pf", 2) != 0)
return (RES_FAILURE);
if (strcmp(cmd, PFEXEC) == 0)
return (RES_PFEXEC);
if (strlen(name) >= MAXPATHLEN)
return (RES_FAILURE);
if (cmd == name) {
(void) strlcpy(buf, cmd + 2, MAXPATHLEN);
} else {
(void) strncpy(buf, name, cmd - name);
(void) strcpy(buf + (cmd - name), cmd + 2);
}
return (RES_OK);
}
static void
usage(void)
{
(void) fprintf(stderr, gettext("pfexec [-P privset] cmd [arg ..]\n"));
exit(EXIT_FAILURE);
}
int
main(int argc, char **argv)
{
char *cmd;
char *pset = NULL;
char pathbuf[MAXPATHLEN];
int c;
priv_set_t *wanted;
int oflag;
oflag = getpflags(PRIV_PFEXEC);
if (setpflags(PRIV_PFEXEC, 1) != 0) {
(void) fprintf(stderr,
gettext("pfexec: unable to set PFEXEC flag: %s\n"),
strerror(errno));
exit(1);
}
if (*argv[0] == '-')
cmd = argv[0] + 1;
else
cmd = argv[0];
/* Strip "pf" from argv[0], it confuses some shells. */
if (strncmp(cmd, "pf", 2) == 0) {
argv[0] += 2;
/* argv[0] will need to start with '-' again. */
if (argv[0][-2] == '-')
*argv[0] = '-';
}
/* If this fails, we just continue with plan B */
if (shellname(getexecname(), pathbuf) == RES_OK)
(void) execv(pathbuf, argv);
switch (shellname(cmd, pathbuf)) {
case RES_OK:
(void) execv(pathbuf, argv);
(void) fprintf(stderr,
gettext("pfexec: unable to execute %s: %s\n"),
pathbuf, strerror(errno));
return (1);
case RES_PFEXEC:
case RES_FAILURE:
while ((c = getopt(argc, argv, "P:")) != EOF) {
switch (c) {
case 'P':
if (pset == NULL) {
pset = optarg;
break;
}
/* FALLTHROUGH */
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc < 1)
usage();
if (pset != NULL) {
if ((wanted = priv_str_to_set(pset, ",", NULL)) ==
NULL) {
(void) fprintf(stderr,
gettext("pfexec: error parsing "
"privileges: %s\n"), strerror(errno));
exit(EXIT_FAILURE);
}
if (setppriv(PRIV_ON, PRIV_INHERITABLE, wanted) != 0) {
(void) fprintf(stderr,
gettext("pfexec: error setting "
"privileges: %s\n"), strerror(errno));
exit(EXIT_FAILURE);
}
(void) setpflags(PRIV_PFEXEC, oflag);
}
(void) execvp(argv[0], argv);
(void) fprintf(stderr,
gettext("pfexec: unable to execute %s: %s\n"),
argv[0], strerror(errno));
return (1);
}
return (1);
}
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