Rework source layout in preparation for modular sudo.

plugins/sudoers/goodpath.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <stdio.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#else
+# ifdef HAVE_STRINGS_H
+#  include <strings.h>
+# endif
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+#include <errno.h>
+
+#include "sudo.h"
+
+/*
+ * Verify that path is a normal file and executable by root.
+ */
+char *
+sudo_goodpath(path, sbp)
+    const char *path;
+    struct stat *sbp;
+{
+    struct stat sb;
+
+    /* Check for brain damage */
+    if (path == NULL || path[0] == '\0')
+	return(NULL);
+
+    if (stat(path, &sb))
+	return(NULL);
+
+    /* Make sure path describes an executable regular file. */
+    if (!S_ISREG(sb.st_mode) || !(sb.st_mode & 0000111)) {
+	errno = EACCES;
+	return(NULL);
+    }
+
+    if (sbp != NULL)
+	(void) memcpy(sbp, &sb, sizeof(struct stat));
+    return((char *)path);
+}