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/* runcon -- run command with specified security context
Copyright (C) 2005-2017 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/*
* runcon [ context
* | ( [ -c ] [ -r role ] [-t type] [ -u user ] [ -l levelrange ] )
* command [arg1 [arg2 ...] ]
*
* attempt to run the specified command with the specified context.
*
* -r role : use the current context with the specified role
* -t type : use the current context with the specified type
* -u user : use the current context with the specified user
* -l level : use the current context with the specified level range
* -c : compute process transition context before modifying
*
* Contexts are interpreted as follows:
*
* Number of MLS
* components system?
*
* 1 - type
* 2 - role:type
* 3 Y role:type:range
* 3 N user:role:type
* 4 Y user:role:type:range
* 4 N error
*/
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <selinux/selinux.h>
#include <selinux/context.h>
#include <sys/types.h>
#include "system.h"
#include "die.h"
#include "error.h"
#include "quote.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "runcon"
#define AUTHORS proper_name ("Russell Coker")
static struct option const long_options[] =
{
{"role", required_argument, NULL, 'r'},
{"type", required_argument, NULL, 't'},
{"user", required_argument, NULL, 'u'},
{"range", required_argument, NULL, 'l'},
{"compute", no_argument, NULL, 'c'},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("\
Usage: %s CONTEXT COMMAND [args]\n\
or: %s [ -c ] [-u USER] [-r ROLE] [-t TYPE] [-l RANGE] COMMAND [args]\n\
"), program_name, program_name);
fputs (_("\
Run a program in a different SELinux security context.\n\
With neither CONTEXT nor COMMAND, print the current security context.\n\
"), stdout);
emit_mandatory_arg_note ();
fputs (_("\
CONTEXT Complete security context\n\
-c, --compute compute process transition context before modifying\n\
-t, --type=TYPE type (for same role as parent)\n\
-u, --user=USER user identity\n\
-r, --role=ROLE role\n\
-l, --range=RANGE levelrange\n\
\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
int
main (int argc, char **argv)
{
char *role = NULL;
char *range = NULL;
char *user = NULL;
char *type = NULL;
char *context = NULL;
char *cur_context = NULL;
char *file_context = NULL;
char *new_context = NULL;
bool compute_trans = false;
context_t con;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
while (1)
{
int option_index = 0;
int c = getopt_long (argc, argv, "+r:t:u:l:c", long_options,
&option_index);
if (c == -1)
break;
switch (c)
{
case 'r':
if (role)
die (EXIT_FAILURE, 0, _("multiple roles"));
role = optarg;
break;
case 't':
if (type)
die (EXIT_FAILURE, 0, _("multiple types"));
type = optarg;
break;
case 'u':
if (user)
die (EXIT_FAILURE, 0, _("multiple users"));
user = optarg;
break;
case 'l':
if (range)
die (EXIT_FAILURE, 0, _("multiple levelranges"));
range = optarg;
break;
case 'c':
compute_trans = true;
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
break;
}
}
if (argc - optind == 0)
{
if (getcon (&cur_context) < 0)
die (EXIT_FAILURE, errno, _("failed to get current context"));
fputs (cur_context, stdout);
fputc ('\n', stdout);
return EXIT_SUCCESS;
}
if (!(user || role || type || range || compute_trans))
{
if (optind >= argc)
{
error (0, 0, _("you must specify -c, -t, -u, -l, -r, or context"));
usage (EXIT_FAILURE);
}
context = argv[optind++];
}
if (optind >= argc)
{
error (0, 0, _("no command specified"));
usage (EXIT_FAILURE);
}
if (is_selinux_enabled () != 1)
die (EXIT_FAILURE, 0, _("%s may be used only on a SELinux kernel"),
program_name);
if (context)
{
con = context_new (context);
if (!con)
die (EXIT_FAILURE, errno, _("failed to create security context: %s"),
quote (context));
}
else
{
if (getcon (&cur_context) < 0)
die (EXIT_FAILURE, errno, _("failed to get current context"));
/* We will generate context based on process transition */
if (compute_trans)
{
/* Get context of file to be executed */
if (getfilecon (argv[optind], &file_context) == -1)
die (EXIT_FAILURE, errno,
_("failed to get security context of %s"),
quoteaf (argv[optind]));
/* compute result of process transition */
if (security_compute_create (cur_context, file_context,
string_to_security_class ("process"),
&new_context) != 0)
die (EXIT_FAILURE, errno, _("failed to compute a new context"));
/* free contexts */
freecon (file_context);
freecon (cur_context);
/* set cur_context equal to new_context */
cur_context = new_context;
}
con = context_new (cur_context);
if (!con)
die (EXIT_FAILURE, errno, _("failed to create security context: %s"),
quote (cur_context));
if (user && context_user_set (con, user))
die (EXIT_FAILURE, errno, _("failed to set new user: %s"),
quote (user));
if (type && context_type_set (con, type))
die (EXIT_FAILURE, errno, _("failed to set new type: %s"),
quote (type));
if (range && context_range_set (con, range))
die (EXIT_FAILURE, errno, _("failed to set new range: %s"),
quote (range));
if (role && context_role_set (con, role))
die (EXIT_FAILURE, errno, _("failed to set new role: %s"),
quote (role));
}
if (security_check_context (context_str (con)) < 0)
die (EXIT_FAILURE, errno, _("invalid context: %s"),
quote (context_str (con)));
if (setexeccon (context_str (con)) != 0)
die (EXIT_FAILURE, errno, _("unable to set security context %s"),
quote (context_str (con)));
if (cur_context != NULL)
freecon (cur_context);
execvp (argv[optind], argv + optind);
int exit_status = errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE;
error (0, errno, "%s", quote (argv[optind]));
return exit_status;
}
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