coreutils-8.25HEADcoreutils-8.25master

1 files changed, 263 insertions, 0 deletions

diff --git a/src/runcon.c b/src/runcon.c
new file mode 100644
index 0000000..b25db04
--- /dev/null
+++ b/src/runcon.c
@@ -0,0 +1,263 @@
+/* runcon -- run command with specified security context
+   Copyright (C) 2005-2016 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 "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)
+            error (EXIT_FAILURE, 0, _("multiple roles"));
+          role = optarg;
+          break;
+        case 't':
+          if (type)
+            error (EXIT_FAILURE, 0, _("multiple types"));
+          type = optarg;
+          break;
+        case 'u':
+          if (user)
+            error (EXIT_FAILURE, 0, _("multiple users"));
+          user = optarg;
+          break;
+        case 'l':
+          if (range)
+            error (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)
+        error (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)
+    error (EXIT_FAILURE, 0, _("%s may be used only on a SELinux kernel"),
+           program_name);
+
+  if (context)
+    {
+      con = context_new (context);
+      if (!con)
+        error (EXIT_FAILURE, errno, _("failed to create security context: %s"),
+               quote (context));
+    }
+  else
+    {
+      if (getcon (&cur_context) < 0)
+        error (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)
+            error (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)
+            error (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)
+        error (EXIT_FAILURE, errno, _("failed to create security context: %s"),
+               quote (cur_context));
+      if (user && context_user_set (con, user))
+        error (EXIT_FAILURE, errno, _("failed to set new user: %s"),
+               quote (user));
+      if (type && context_type_set (con, type))
+        error (EXIT_FAILURE, errno, _("failed to set new type: %s"),
+               quote (type));
+      if (range && context_range_set (con, range))
+        error (EXIT_FAILURE, errno, _("failed to set new range: %s"),
+               quote (range));
+      if (role && context_role_set (con, role))
+        error (EXIT_FAILURE, errno, _("failed to set new role: %s"),
+               quote (role));
+    }
+
+  if (security_check_context (context_str (con)) < 0)
+    error (EXIT_FAILURE, errno, _("invalid context: %s"),
+           quote (context_str (con)));
+
+  if (setexeccon (context_str (con)) != 0)
+    error (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;
+}