util-linux-ng-2.17.2/login-utils/selinux_utils.c

#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <selinux/selinux.h>
#include <selinux/flask.h>
#include <selinux/av_permissions.h>
#include <selinux/context.h>
#include "selinux_utils.h"

int checkAccess(char *chuser, int access) {
  int status=-1;
  security_context_t user_context;
  const char *user=NULL;
  if( getprevcon(&user_context)==0 ) {
    context_t c=context_new(user_context);
    user=context_user_get(c);
    if (strcmp(chuser, user) == 0) {
      status=0;
    } else {
      struct av_decision avd;
      int retval = security_compute_av(user_context,
				       user_context,
				       SECCLASS_PASSWD,
				       access,
				       &avd);
	  
      if ((retval == 0) && 
	  ((access & avd.allowed) == access)) {
	status=0;
      }
    }
    context_free(c);
    freecon(user_context);
  }
  return status;
}

int setupDefaultContext(char *orig_file) {
  if (is_selinux_enabled() > 0) {
    security_context_t scontext;
    
    if (getfilecon(orig_file,&scontext)<0) {
      return 1;
    }
    
    if (setfscreatecon(scontext) < 0) 
      {
	freecon(scontext);
	return 1;
      }
    freecon(scontext);
  }
  return 0;
}