Re: [redhat-lspp] Re: [PATCH 2/3] Re: MLS enforcing PTYs, sshd, and newrole

[Daniel J Walsh <dwalsh@redhat.com>]

newrole patch. for checking securetty.


diff --exclude-from=exclude --exclude POTFILES.in --exclude='*.po' 
--exclude='*.pot' -N -u -r nsapolicycoreutils/newrole/newrole.c 
policycoreutils-1.33.8/newrole/newrole.c
--- nsapolicycoreutils/newrole/newrole.c        2007-01-04 
17:01:41.000000000 -0500
+++ policycoreutils-1.33.8/newrole/newrole.c    2007-01-05 
11:17:36.000000000 -0500
@@ -733,6 +734,7 @@
                                        security_context_t *new_context,
                                        int *preserve_environment)
 {
+       int i;                  /* index for open file descriptors */
        int flag_index;         /* flag index in argv[] */
        int clflag;             /* holds codes for command line flags */
        char *role_s = NULL;    /* role spec'd by user in argv[] */
@@ -741,6 +743,8 @@
        char *level_s = NULL;   /* level spec'd by user in argv[] */
        char *range_ptr = NULL;
        security_context_t new_con = NULL;
+       security_context_t tty_con = NULL;
+       int securetty=0;
        context_t context = NULL; /* manipulatable form of new_context */
        const struct option long_options[] = {
                {"role", 1, 0, 'r'},
@@ -793,6 +797,18 @@
                                        "specified\n"));
                                return -1;
                        }
+                       for (i=0; i < 3; i++) {
+                               securetty=0;
+                               if (fgetfilecon(i,&tty_con) >= 0) {
+                                       securetty = 
(selinux_check_securetty_context(tty_con) == 1);
+                                       freecon(tty_con);
+                               }
+                               if (!securetty) {
+                                       fprintf(stderr, "Error: you are 
not allowed to change levels on a non secure terminal\n");
+                                       return -1;
+                               }
+                       }
+
                        level_s = optarg;
                        break;
                default:


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