Set usrinfo for AIX

Set adminstrative domain for the process when looking up user's
    password or group info and when preparing for execve().
Include strings.h even if string.h exists since they may define
    different things.  Fixes warnings on AIX and others.

src/sudo.c

@@ -46,11 +46,10 @@
 #  include <memory.h>
 # endif
 # include <string.h>
-#else
-# ifdef HAVE_STRINGS_H
-#  include <strings.h>
-# endif
 #endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif /* HAVE_UNISTD_H */
@@ -72,6 +71,9 @@
 #ifdef HAVE_SELINUX
 # include <selinux/selinux.h>
 #endif
+#ifdef HAVE_SETAUTHDB
+# include <usersec.h>
+#endif /* HAVE_SETAUTHDB */
 
 #include "sudo.h"
 #include "sudo_plugin.h"
@@ -645,7 +647,13 @@ exec_setup(struct command_details *details, const char *ptyname, int ptyfd)
     int rval = FALSE;
     struct passwd *pw;
 
+#ifdef HAVE_SETAUTHDB
+    aix_setauthdb(IDtouser(details->euid));
+#endif
     pw = getpwuid(details->euid);
+#ifdef HAVE_SETAUTHDB
+    aix_restoreauthdb();
+#endif
 
     /* Call policy plugin's session init before other setup occurs. */
     if (policy_plugin.u.policy->init_session) {
@@ -664,7 +672,7 @@ exec_setup(struct command_details *details, const char *ptyname, int ptyfd)
 
     if (pw != NULL) {
 #ifdef HAVE_GETUSERATTR
-	aix_setlimits(pw->pw_name);
+	aix_prep_user(pw->pw_name, ptyname ? ptyname : user_details.tty);
 #endif
 #ifdef HAVE_LOGIN_CAP_H
 	if (details->login_class) {