1209 lines
36 KiB
C
1209 lines
36 KiB
C
/* $FreeBSD$ */
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/*
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* Copyright (C) 2012 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*/
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#if defined(KERNEL) || defined(_KERNEL)
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# undef KERNEL
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# undef _KERNEL
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# define KERNEL 1
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# define _KERNEL 1
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#endif
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/file.h>
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#if !defined(_KERNEL)
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# include <stdio.h>
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# include <stdlib.h>
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# ifdef _STDC_C99
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# include <stdbool.h>
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# endif
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# include <string.h>
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# define _KERNEL
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# include <sys/uio.h>
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# undef _KERNEL
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#endif
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#if defined(_KERNEL) && defined(__FreeBSD__)
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# include <sys/filio.h>
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# include <sys/fcntl.h>
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#else
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# include <sys/ioctl.h>
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#endif
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# include <sys/protosw.h>
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#include <sys/socket.h>
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#if defined(_KERNEL)
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# include <sys/systm.h>
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# if !defined(__SVR4)
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# include <sys/mbuf.h>
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# endif
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#endif
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#if defined(__SVR4)
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# include <sys/filio.h>
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# include <sys/byteorder.h>
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# ifdef _KERNEL
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# include <sys/dditypes.h>
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# endif
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# include <sys/stream.h>
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# include <sys/kmem.h>
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#endif
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#if defined(__FreeBSD__)
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# include <sys/queue.h>
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#endif
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#if defined(__NetBSD__)
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# include <machine/cpu.h>
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#endif
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#if defined(_KERNEL) && defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000)
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# include <sys/proc.h>
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#endif
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#if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 400000) && \
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!defined(_KERNEL)
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# include <stdbool.h>
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#endif
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#include <net/if.h>
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#ifdef sun
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# include <net/af.h>
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#endif
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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# include <netinet/ip_var.h>
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#if !defined(_KERNEL)
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# define KERNEL
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# define _KERNEL
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# define NOT_KERNEL
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#endif
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#ifdef NOT_KERNEL
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# undef _KERNEL
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# undef KERNEL
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#endif
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#include <netinet/tcp.h>
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#if defined(__FreeBSD__)
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# include <net/if_var.h>
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# define IF_QFULL _IF_QFULL
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# define IF_DROP _IF_DROP
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#endif
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#include <netinet/in_var.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#include "netinet/ip_compat.h"
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#include <netinet/tcpip.h>
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#include "netinet/ip_fil.h"
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#include "netinet/ip_auth.h"
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#if !SOLARIS
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# include <net/netisr.h>
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# ifdef __FreeBSD__
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# include <machine/cpufunc.h>
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# endif
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#endif
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#if defined(__FreeBSD__)
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# include <sys/malloc.h>
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# if defined(_KERNEL) && !defined(IPFILTER_LKM)
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# include <sys/libkern.h>
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# include <sys/systm.h>
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# endif
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#endif
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/* END OF INCLUDES */
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#if !defined(lint)
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static const char rcsid[] = "@(#)$FreeBSD$";
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/* static const char rcsid[] = "@(#)$Id: ip_auth.c,v 2.73.2.24 2007/09/09 11:32:04 darrenr Exp $"; */
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#endif
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static void ipf_auth_deref(frauthent_t **);
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static void ipf_auth_deref_unlocked(ipf_auth_softc_t *, frauthent_t **);
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static int ipf_auth_geniter(ipf_main_softc_t *, ipftoken_t *,
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ipfgeniter_t *, ipfobj_t *);
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static int ipf_auth_reply(ipf_main_softc_t *, ipf_auth_softc_t *, char *);
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static int ipf_auth_wait(ipf_main_softc_t *, ipf_auth_softc_t *, char *);
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static int ipf_auth_flush(void *);
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_main_load */
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/* Returns: int - 0 == success, else error */
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/* Parameters: None */
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/* */
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/* A null-op function that exists as a placeholder so that the flow in */
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/* other functions is obvious. */
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/* ------------------------------------------------------------------------ */
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int
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ipf_auth_main_load(void)
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{
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return (0);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_main_unload */
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/* Returns: int - 0 == success, else error */
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/* Parameters: None */
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/* */
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/* A null-op function that exists as a placeholder so that the flow in */
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/* other functions is obvious. */
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/* ------------------------------------------------------------------------ */
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int
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ipf_auth_main_unload(void)
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{
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return (0);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_soft_create */
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/* Returns: int - NULL = failure, else success */
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/* Parameters: softc(I) - pointer to soft context data */
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/* */
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/* Create a structre to store all of the run-time data for packet auth in */
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/* and initialise some fields to their defaults. */
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/* ------------------------------------------------------------------------ */
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void *
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ipf_auth_soft_create(ipf_main_softc_t *softc)
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{
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ipf_auth_softc_t *softa;
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KMALLOC(softa, ipf_auth_softc_t *);
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if (softa == NULL)
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return (NULL);
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bzero((char *)softa, sizeof(*softa));
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softa->ipf_auth_size = FR_NUMAUTH;
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softa->ipf_auth_defaultage = 600;
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RWLOCK_INIT(&softa->ipf_authlk, "ipf IP User-Auth rwlock");
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MUTEX_INIT(&softa->ipf_auth_mx, "ipf auth log mutex");
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#if SOLARIS && defined(_KERNEL)
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cv_init(&softa->ipf_auth_wait, "ipf auth condvar", CV_DRIVER, NULL);
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#endif
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return (softa);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_soft_init */
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/* Returns: int - 0 == success, else error */
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/* Parameters: softc(I) - pointer to soft context data */
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/* arg(I) - opaque pointer to auth context data */
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/* */
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/* Allocate memory and initialise data structures used in handling auth */
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/* rules. */
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/* ------------------------------------------------------------------------ */
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int
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ipf_auth_soft_init(ipf_main_softc_t *softc, void *arg)
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{
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ipf_auth_softc_t *softa = arg;
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KMALLOCS(softa->ipf_auth, frauth_t *,
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softa->ipf_auth_size * sizeof(*softa->ipf_auth));
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if (softa->ipf_auth == NULL)
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return (-1);
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bzero((char *)softa->ipf_auth,
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softa->ipf_auth_size * sizeof(*softa->ipf_auth));
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KMALLOCS(softa->ipf_auth_pkts, mb_t **,
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softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts));
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if (softa->ipf_auth_pkts == NULL)
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return (-2);
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bzero((char *)softa->ipf_auth_pkts,
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softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts));
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return (0);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_soft_fini */
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/* Returns: int - 0 == success, else error */
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/* Parameters: softc(I) - pointer to soft context data */
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/* arg(I) - opaque pointer to auth context data */
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/* */
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/* Free all network buffer memory used to keep saved packets that have been */
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/* connectedd to the soft soft context structure *but* do not free that: it */
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/* is free'd by _destroy(). */
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/* ------------------------------------------------------------------------ */
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int
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ipf_auth_soft_fini(ipf_main_softc_t *softc, void *arg)
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{
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ipf_auth_softc_t *softa = arg;
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frauthent_t *fae, **faep;
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frentry_t *fr, **frp;
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mb_t *m;
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int i;
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if (softa->ipf_auth != NULL) {
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KFREES(softa->ipf_auth,
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softa->ipf_auth_size * sizeof(*softa->ipf_auth));
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softa->ipf_auth = NULL;
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}
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if (softa->ipf_auth_pkts != NULL) {
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for (i = 0; i < softa->ipf_auth_size; i++) {
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m = softa->ipf_auth_pkts[i];
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if (m != NULL) {
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FREE_MB_T(m);
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softa->ipf_auth_pkts[i] = NULL;
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}
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}
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KFREES(softa->ipf_auth_pkts,
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softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts));
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softa->ipf_auth_pkts = NULL;
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}
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faep = &softa->ipf_auth_entries;
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while ((fae = *faep) != NULL) {
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*faep = fae->fae_next;
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KFREE(fae);
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}
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softa->ipf_auth_ip = NULL;
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if (softa->ipf_auth_rules != NULL) {
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for (frp = &softa->ipf_auth_rules; ((fr = *frp) != NULL); ) {
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if (fr->fr_ref == 1) {
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*frp = fr->fr_next;
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MUTEX_DESTROY(&fr->fr_lock);
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KFREE(fr);
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} else
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frp = &fr->fr_next;
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}
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}
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return (0);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_soft_destroy */
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/* Returns: void */
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/* Parameters: softc(I) - pointer to soft context data */
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/* arg(I) - opaque pointer to auth context data */
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/* */
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/* Undo what was done in _create() - i.e. free the soft context data. */
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/* ------------------------------------------------------------------------ */
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void
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ipf_auth_soft_destroy(ipf_main_softc_t *softc, void *arg)
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{
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ipf_auth_softc_t *softa = arg;
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#if SOLARIS && defined(_KERNEL)
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cv_destroy(&softa->ipf_auth_wait);
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#endif
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MUTEX_DESTROY(&softa->ipf_auth_mx);
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RW_DESTROY(&softa->ipf_authlk);
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KFREE(softa);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_setlock */
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/* Returns: void */
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/* Paramters: arg(I) - pointer to soft context data */
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/* tmp(I) - value to assign to auth lock */
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/* */
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/* ------------------------------------------------------------------------ */
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void
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ipf_auth_setlock(void *arg, int tmp)
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{
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ipf_auth_softc_t *softa = arg;
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softa->ipf_auth_lock = tmp;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_check */
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/* Returns: frentry_t* - pointer to ipf rule if match found, else NULL */
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/* Parameters: fin(I) - pointer to ipftoken structure */
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/* passp(I) - pointer to ipfgeniter structure */
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/* */
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/* Check if a packet has authorization. If the packet is found to match an */
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/* authorization result and that would result in a feedback loop (i.e. it */
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/* will end up returning FR_AUTH) then return FR_BLOCK instead. */
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/* ------------------------------------------------------------------------ */
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frentry_t *
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ipf_auth_check(fr_info_t *fin, u_32_t *passp)
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{
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ipf_main_softc_t *softc = fin->fin_main_soft;
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ipf_auth_softc_t *softa = softc->ipf_auth_soft;
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frentry_t *fr;
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frauth_t *fra;
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u_32_t pass;
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u_short id;
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ip_t *ip;
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int i;
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if (softa->ipf_auth_lock || !softa->ipf_auth_used)
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return (NULL);
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ip = fin->fin_ip;
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id = ip->ip_id;
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READ_ENTER(&softa->ipf_authlk);
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for (i = softa->ipf_auth_start; i != softa->ipf_auth_end; ) {
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/*
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* index becomes -2 only after an SIOCAUTHW. Check this in
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* case the same packet gets sent again and it hasn't yet been
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* auth'd.
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*/
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fra = softa->ipf_auth + i;
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if ((fra->fra_index == -2) && (id == fra->fra_info.fin_id) &&
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!bcmp((char *)fin, (char *)&fra->fra_info, FI_CSIZE)) {
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/*
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* Avoid feedback loop.
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*/
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if (!(pass = fra->fra_pass) || (FR_ISAUTH(pass))) {
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pass = FR_BLOCK;
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fin->fin_reason = FRB_AUTHFEEDBACK;
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}
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/*
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* Create a dummy rule for the stateful checking to
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* use and return. Zero out any values we don't
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* trust from userland!
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*/
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if ((pass & FR_KEEPSTATE) || ((pass & FR_KEEPFRAG) &&
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(fin->fin_flx & FI_FRAG))) {
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KMALLOC(fr, frentry_t *);
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if (fr) {
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bcopy((char *)fra->fra_info.fin_fr,
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(char *)fr, sizeof(*fr));
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fr->fr_grp = NULL;
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fr->fr_ifa = fin->fin_ifp;
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fr->fr_func = NULL;
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fr->fr_ref = 1;
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fr->fr_flags = pass;
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fr->fr_ifas[1] = NULL;
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fr->fr_ifas[2] = NULL;
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fr->fr_ifas[3] = NULL;
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MUTEX_INIT(&fr->fr_lock,
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"ipf auth rule");
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}
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} else
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fr = fra->fra_info.fin_fr;
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fin->fin_fr = fr;
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fin->fin_flx |= fra->fra_flx;
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RWLOCK_EXIT(&softa->ipf_authlk);
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WRITE_ENTER(&softa->ipf_authlk);
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/*
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* ipf_auth_rules is populated with the rules malloc'd
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* above and only those.
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*/
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if ((fr != NULL) && (fr != fra->fra_info.fin_fr)) {
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fr->fr_next = softa->ipf_auth_rules;
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softa->ipf_auth_rules = fr;
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}
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softa->ipf_auth_stats.fas_hits++;
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fra->fra_index = -1;
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softa->ipf_auth_used--;
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softa->ipf_auth_replies--;
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if (i == softa->ipf_auth_start) {
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while (fra->fra_index == -1) {
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i++;
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fra++;
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if (i == softa->ipf_auth_size) {
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i = 0;
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fra = softa->ipf_auth;
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}
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softa->ipf_auth_start = i;
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if (i == softa->ipf_auth_end)
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break;
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}
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if (softa->ipf_auth_start ==
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softa->ipf_auth_end) {
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softa->ipf_auth_next = 0;
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softa->ipf_auth_start = 0;
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softa->ipf_auth_end = 0;
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}
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}
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RWLOCK_EXIT(&softa->ipf_authlk);
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if (passp != NULL)
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*passp = pass;
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softa->ipf_auth_stats.fas_hits++;
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return (fr);
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}
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i++;
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if (i == softa->ipf_auth_size)
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i = 0;
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}
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RWLOCK_EXIT(&softa->ipf_authlk);
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softa->ipf_auth_stats.fas_miss++;
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return (NULL);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_auth_new */
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/* Returns: int - 1 == success, 0 = did not put packet on auth queue */
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/* Parameters: m(I) - pointer to mb_t with packet in it */
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/* fin(I) - pointer to packet information */
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/* */
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/* Check if we have room in the auth array to hold details for another */
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/* packet. If we do, store it and wake up any user programs which are */
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/* waiting to hear about these events. */
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/* ------------------------------------------------------------------------ */
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int
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ipf_auth_new(mb_t *m, fr_info_t *fin)
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{
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ipf_main_softc_t *softc = fin->fin_main_soft;
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ipf_auth_softc_t *softa = softc->ipf_auth_soft;
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#if defined(_KERNEL) && SOLARIS
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qpktinfo_t *qpi = fin->fin_qpi;
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#endif
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frauth_t *fra;
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#if !defined(sparc) && !defined(m68k)
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ip_t *ip;
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#endif
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int i;
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if (softa->ipf_auth_lock)
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return (0);
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WRITE_ENTER(&softa->ipf_authlk);
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if (((softa->ipf_auth_end + 1) % softa->ipf_auth_size) ==
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softa->ipf_auth_start) {
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softa->ipf_auth_stats.fas_nospace++;
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RWLOCK_EXIT(&softa->ipf_authlk);
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return (0);
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}
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softa->ipf_auth_stats.fas_added++;
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softa->ipf_auth_used++;
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i = softa->ipf_auth_end++;
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if (softa->ipf_auth_end == softa->ipf_auth_size)
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softa->ipf_auth_end = 0;
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fra = softa->ipf_auth + i;
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fra->fra_index = i;
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if (fin->fin_fr != NULL)
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fra->fra_pass = fin->fin_fr->fr_flags;
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else
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fra->fra_pass = 0;
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fra->fra_age = softa->ipf_auth_defaultage;
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bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin));
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fra->fra_flx = fra->fra_info.fin_flx & (FI_STATE|FI_NATED);
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fra->fra_info.fin_flx &= ~(FI_STATE|FI_NATED);
|
|
#if !defined(sparc) && !defined(m68k)
|
|
/*
|
|
* No need to copyback here as we want to undo the changes, not keep
|
|
* them.
|
|
*/
|
|
ip = fin->fin_ip;
|
|
# if SOLARIS && defined(_KERNEL)
|
|
if ((ip == (ip_t *)m->b_rptr) && (fin->fin_v == 4))
|
|
# endif
|
|
{
|
|
register u_short bo;
|
|
|
|
bo = ip->ip_len;
|
|
ip->ip_len = htons(bo);
|
|
bo = ip->ip_off;
|
|
ip->ip_off = htons(bo);
|
|
}
|
|
#endif
|
|
#if SOLARIS && defined(_KERNEL)
|
|
COPYIFNAME(fin->fin_v, fin->fin_ifp, fra->fra_info.fin_ifname);
|
|
m->b_rptr -= qpi->qpi_off;
|
|
fra->fra_q = qpi->qpi_q; /* The queue can disappear! */
|
|
fra->fra_m = *fin->fin_mp;
|
|
fra->fra_info.fin_mp = &fra->fra_m;
|
|
softa->ipf_auth_pkts[i] = *(mblk_t **)fin->fin_mp;
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
cv_signal(&softa->ipf_auth_wait);
|
|
pollwakeup(&softc->ipf_poll_head[IPL_LOGAUTH], POLLIN|POLLRDNORM);
|
|
#else
|
|
softa->ipf_auth_pkts[i] = m;
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
WAKEUP(&softa->ipf_auth_next, 0);
|
|
#endif
|
|
return (1);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_ioctl */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: data(IO) - pointer to ioctl data */
|
|
/* cmd(I) - ioctl command */
|
|
/* mode(I) - mode flags associated with open descriptor */
|
|
/* uid(I) - uid associatd with application making the call */
|
|
/* ctx(I) - pointer for context */
|
|
/* */
|
|
/* This function handles all of the ioctls recognised by the auth component */
|
|
/* in IPFilter - ie ioctls called on an open fd for /dev/ipf_auth */
|
|
/* ------------------------------------------------------------------------ */
|
|
int
|
|
ipf_auth_ioctl(ipf_main_softc_t *softc, caddr_t data, ioctlcmd_t cmd,
|
|
int mode, int uid, void *ctx)
|
|
{
|
|
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
|
|
int error = 0, i;
|
|
SPL_INT(s);
|
|
|
|
switch (cmd)
|
|
{
|
|
case SIOCGENITER :
|
|
{
|
|
ipftoken_t *token;
|
|
ipfgeniter_t iter;
|
|
ipfobj_t obj;
|
|
|
|
error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER);
|
|
if (error != 0)
|
|
break;
|
|
|
|
SPL_SCHED(s);
|
|
token = ipf_token_find(softc, IPFGENITER_AUTH, uid, ctx);
|
|
if (token != NULL)
|
|
error = ipf_auth_geniter(softc, token, &iter, &obj);
|
|
else {
|
|
WRITE_ENTER(&softc->ipf_tokens);
|
|
ipf_token_deref(softc, token);
|
|
RWLOCK_EXIT(&softc->ipf_tokens);
|
|
IPFERROR(10001);
|
|
error = ESRCH;
|
|
}
|
|
SPL_X(s);
|
|
|
|
break;
|
|
}
|
|
|
|
case SIOCADAFR :
|
|
case SIOCRMAFR :
|
|
if (!(mode & FWRITE)) {
|
|
IPFERROR(10002);
|
|
error = EPERM;
|
|
} else
|
|
error = frrequest(softc, IPL_LOGAUTH, cmd, data,
|
|
softc->ipf_active, 1);
|
|
break;
|
|
|
|
case SIOCSTLCK :
|
|
if (!(mode & FWRITE)) {
|
|
IPFERROR(10003);
|
|
error = EPERM;
|
|
} else {
|
|
error = ipf_lock(data, &softa->ipf_auth_lock);
|
|
}
|
|
break;
|
|
|
|
case SIOCATHST:
|
|
softa->ipf_auth_stats.fas_faelist = softa->ipf_auth_entries;
|
|
error = ipf_outobj(softc, data, &softa->ipf_auth_stats,
|
|
IPFOBJ_AUTHSTAT);
|
|
break;
|
|
|
|
case SIOCIPFFL:
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&softa->ipf_authlk);
|
|
i = ipf_auth_flush(softa);
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
error = BCOPYOUT(&i, data, sizeof(i));
|
|
if (error != 0) {
|
|
IPFERROR(10004);
|
|
error = EFAULT;
|
|
}
|
|
break;
|
|
|
|
case SIOCAUTHW:
|
|
error = ipf_auth_wait(softc, softa, data);
|
|
break;
|
|
|
|
case SIOCAUTHR:
|
|
error = ipf_auth_reply(softc, softa, data);
|
|
break;
|
|
|
|
default :
|
|
IPFERROR(10005);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_expire */
|
|
/* Returns: None */
|
|
/* Parameters: None */
|
|
/* */
|
|
/* Slowly expire held auth records. Timeouts are set in expectation of */
|
|
/* this being called twice per second. */
|
|
/* ------------------------------------------------------------------------ */
|
|
void
|
|
ipf_auth_expire(ipf_main_softc_t *softc)
|
|
{
|
|
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
|
|
frauthent_t *fae, **faep;
|
|
frentry_t *fr, **frp;
|
|
frauth_t *fra;
|
|
mb_t *m;
|
|
int i;
|
|
SPL_INT(s);
|
|
|
|
if (softa->ipf_auth_lock)
|
|
return;
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&softa->ipf_authlk);
|
|
for (i = 0, fra = softa->ipf_auth; i < softa->ipf_auth_size;
|
|
i++, fra++) {
|
|
fra->fra_age--;
|
|
if ((fra->fra_age == 0) &&
|
|
(softa->ipf_auth[i].fra_index != -1)) {
|
|
if ((m = softa->ipf_auth_pkts[i]) != NULL) {
|
|
FREE_MB_T(m);
|
|
softa->ipf_auth_pkts[i] = NULL;
|
|
} else if (softa->ipf_auth[i].fra_index == -2) {
|
|
softa->ipf_auth_replies--;
|
|
}
|
|
softa->ipf_auth[i].fra_index = -1;
|
|
softa->ipf_auth_stats.fas_expire++;
|
|
softa->ipf_auth_used--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Expire pre-auth rules
|
|
*/
|
|
for (faep = &softa->ipf_auth_entries; ((fae = *faep) != NULL); ) {
|
|
fae->fae_age--;
|
|
if (fae->fae_age == 0) {
|
|
ipf_auth_deref(&fae);
|
|
softa->ipf_auth_stats.fas_expire++;
|
|
} else
|
|
faep = &fae->fae_next;
|
|
}
|
|
if (softa->ipf_auth_entries != NULL)
|
|
softa->ipf_auth_ip = &softa->ipf_auth_entries->fae_fr;
|
|
else
|
|
softa->ipf_auth_ip = NULL;
|
|
|
|
for (frp = &softa->ipf_auth_rules; ((fr = *frp) != NULL); ) {
|
|
if (fr->fr_ref == 1) {
|
|
*frp = fr->fr_next;
|
|
MUTEX_DESTROY(&fr->fr_lock);
|
|
KFREE(fr);
|
|
} else
|
|
frp = &fr->fr_next;
|
|
}
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_precmd */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: cmd(I) - ioctl command for rule */
|
|
/* fr(I) - pointer to ipf rule */
|
|
/* fptr(I) - pointer to caller's 'fr' */
|
|
/* */
|
|
/* ------------------------------------------------------------------------ */
|
|
int
|
|
ipf_auth_precmd(ipf_main_softc_t *softc, ioctlcmd_t cmd, frentry_t *fr,
|
|
frentry_t **frptr)
|
|
{
|
|
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
|
|
frauthent_t *fae, **faep;
|
|
int error = 0;
|
|
SPL_INT(s);
|
|
|
|
if ((cmd != SIOCADAFR) && (cmd != SIOCRMAFR)) {
|
|
IPFERROR(10006);
|
|
return (EIO);
|
|
}
|
|
|
|
for (faep = &softa->ipf_auth_entries; ((fae = *faep) != NULL); ) {
|
|
if (&fae->fae_fr == fr)
|
|
break;
|
|
else
|
|
faep = &fae->fae_next;
|
|
}
|
|
|
|
if (cmd == (ioctlcmd_t)SIOCRMAFR) {
|
|
if (fr == NULL || frptr == NULL) {
|
|
IPFERROR(10007);
|
|
error = EINVAL;
|
|
|
|
} else if (fae == NULL) {
|
|
IPFERROR(10008);
|
|
error = ESRCH;
|
|
|
|
} else {
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&softa->ipf_authlk);
|
|
*faep = fae->fae_next;
|
|
if (softa->ipf_auth_ip == &fae->fae_fr)
|
|
softa->ipf_auth_ip = softa->ipf_auth_entries ?
|
|
&softa->ipf_auth_entries->fae_fr : NULL;
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
|
|
KFREE(fae);
|
|
}
|
|
} else if (fr != NULL && frptr != NULL) {
|
|
KMALLOC(fae, frauthent_t *);
|
|
if (fae != NULL) {
|
|
bcopy((char *)fr, (char *)&fae->fae_fr,
|
|
sizeof(*fr));
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&softa->ipf_authlk);
|
|
fae->fae_age = softa->ipf_auth_defaultage;
|
|
fae->fae_fr.fr_hits = 0;
|
|
fae->fae_fr.fr_next = *frptr;
|
|
fae->fae_ref = 1;
|
|
*frptr = &fae->fae_fr;
|
|
fae->fae_next = *faep;
|
|
*faep = fae;
|
|
softa->ipf_auth_ip = &softa->ipf_auth_entries->fae_fr;
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
} else {
|
|
IPFERROR(10009);
|
|
error = ENOMEM;
|
|
}
|
|
} else {
|
|
IPFERROR(10010);
|
|
error = EINVAL;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_flush */
|
|
/* Returns: int - number of auth entries flushed */
|
|
/* Parameters: None */
|
|
/* Locks: WRITE(ipf_authlk) */
|
|
/* */
|
|
/* This function flushs the ipf_auth_pkts array of any packet data with */
|
|
/* references still there. */
|
|
/* It is expected that the caller has already acquired the correct locks or */
|
|
/* set the priority level correctly for this to block out other code paths */
|
|
/* into these data structures. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static int
|
|
ipf_auth_flush(void *arg)
|
|
{
|
|
ipf_auth_softc_t *softa = arg;
|
|
int i, num_flushed;
|
|
mb_t *m;
|
|
|
|
if (softa->ipf_auth_lock)
|
|
return (-1);
|
|
|
|
num_flushed = 0;
|
|
|
|
for (i = 0 ; i < softa->ipf_auth_size; i++) {
|
|
if (softa->ipf_auth[i].fra_index != -1) {
|
|
m = softa->ipf_auth_pkts[i];
|
|
if (m != NULL) {
|
|
FREE_MB_T(m);
|
|
softa->ipf_auth_pkts[i] = NULL;
|
|
}
|
|
|
|
softa->ipf_auth[i].fra_index = -1;
|
|
/* perhaps add & use a flush counter inst.*/
|
|
softa->ipf_auth_stats.fas_expire++;
|
|
num_flushed++;
|
|
}
|
|
}
|
|
|
|
softa->ipf_auth_start = 0;
|
|
softa->ipf_auth_end = 0;
|
|
softa->ipf_auth_next = 0;
|
|
softa->ipf_auth_used = 0;
|
|
softa->ipf_auth_replies = 0;
|
|
|
|
return (num_flushed);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_waiting */
|
|
/* Returns: int - number of packets in the auth queue */
|
|
/* Parameters: None */
|
|
/* */
|
|
/* Simple truth check to see if there are any packets waiting in the auth */
|
|
/* queue. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int
|
|
ipf_auth_waiting(ipf_main_softc_t *softc)
|
|
{
|
|
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
|
|
|
|
return (softa->ipf_auth_used != 0);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_geniter */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: token(I) - pointer to ipftoken structure */
|
|
/* itp(I) - pointer to ipfgeniter structure */
|
|
/* objp(I) - pointer to ipf object destription */
|
|
/* */
|
|
/* Iterate through the list of entries in the auth queue list. */
|
|
/* objp is used here to get the location of where to do the copy out to. */
|
|
/* Stomping over various fields with new information will not harm anything */
|
|
/* ------------------------------------------------------------------------ */
|
|
static int
|
|
ipf_auth_geniter(ipf_main_softc_t *softc, ipftoken_t *token,
|
|
ipfgeniter_t *itp, ipfobj_t *objp)
|
|
{
|
|
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
|
|
frauthent_t *fae, *next, zero;
|
|
int error;
|
|
|
|
if (itp->igi_data == NULL) {
|
|
IPFERROR(10011);
|
|
return (EFAULT);
|
|
}
|
|
|
|
if (itp->igi_type != IPFGENITER_AUTH) {
|
|
IPFERROR(10012);
|
|
return (EINVAL);
|
|
}
|
|
|
|
objp->ipfo_type = IPFOBJ_FRAUTH;
|
|
objp->ipfo_ptr = itp->igi_data;
|
|
objp->ipfo_size = sizeof(frauth_t);
|
|
|
|
READ_ENTER(&softa->ipf_authlk);
|
|
|
|
fae = token->ipt_data;
|
|
if (fae == NULL) {
|
|
next = softa->ipf_auth_entries;
|
|
} else {
|
|
next = fae->fae_next;
|
|
}
|
|
|
|
/*
|
|
* If we found an auth entry to use, bump its reference count
|
|
* so that it can be used for is_next when we come back.
|
|
*/
|
|
if (next != NULL) {
|
|
ATOMIC_INC(next->fae_ref);
|
|
token->ipt_data = next;
|
|
} else {
|
|
bzero(&zero, sizeof(zero));
|
|
next = &zero;
|
|
token->ipt_data = NULL;
|
|
}
|
|
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
|
|
error = ipf_outobjk(softc, objp, next);
|
|
if (fae != NULL)
|
|
ipf_auth_deref_unlocked(softa, &fae);
|
|
|
|
if (next->fae_next == NULL)
|
|
ipf_token_mark_complete(token);
|
|
return (error);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_deref_unlocked */
|
|
/* Returns: None */
|
|
/* Parameters: faep(IO) - pointer to caller's frauthent_t pointer */
|
|
/* */
|
|
/* Wrapper for ipf_auth_deref for when a write lock on ipf_authlk is not */
|
|
/* held. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static void
|
|
ipf_auth_deref_unlocked(ipf_auth_softc_t *softa, frauthent_t **faep)
|
|
{
|
|
WRITE_ENTER(&softa->ipf_authlk);
|
|
ipf_auth_deref(faep);
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_deref */
|
|
/* Returns: None */
|
|
/* Parameters: faep(IO) - pointer to caller's frauthent_t pointer */
|
|
/* Locks: WRITE(ipf_authlk) */
|
|
/* */
|
|
/* This function unconditionally sets the pointer in the caller to NULL, */
|
|
/* to make it clear that it should no longer use that pointer, and drops */
|
|
/* the reference count on the structure by 1. If it reaches 0, free it up. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static void
|
|
ipf_auth_deref(frauthent_t **faep)
|
|
{
|
|
frauthent_t *fae;
|
|
|
|
fae = *faep;
|
|
*faep = NULL;
|
|
|
|
fae->fae_ref--;
|
|
if (fae->fae_ref == 0) {
|
|
KFREE(fae);
|
|
}
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_wait_pkt */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: data(I) - pointer to data from ioctl call */
|
|
/* */
|
|
/* This function is called when an application is waiting for a packet to */
|
|
/* match an "auth" rule by issuing an SIOCAUTHW ioctl. If there is already */
|
|
/* a packet waiting on the queue then we will return that _one_ immediately.*/
|
|
/* If there are no packets present in the queue (ipf_auth_pkts) then we go */
|
|
/* to sleep. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static int
|
|
ipf_auth_wait(ipf_main_softc_t *softc, ipf_auth_softc_t *softa, char *data)
|
|
{
|
|
frauth_t auth, *au = &auth;
|
|
int error, len, i;
|
|
mb_t *m;
|
|
char *t;
|
|
SPL_INT(s);
|
|
|
|
ipf_auth_ioctlloop:
|
|
error = ipf_inobj(softc, data, NULL, au, IPFOBJ_FRAUTH);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* XXX Locks are held below over calls to copyout...a better
|
|
* solution needs to be found so this isn't necessary. The situation
|
|
* we are trying to guard against here is an error in the copyout
|
|
* steps should not cause the packet to "disappear" from the queue.
|
|
*/
|
|
SPL_NET(s);
|
|
READ_ENTER(&softa->ipf_authlk);
|
|
|
|
/*
|
|
* If ipf_auth_next is not equal to ipf_auth_end it will be because
|
|
* there is a packet waiting to be delt with in the ipf_auth_pkts
|
|
* array. We copy as much of that out to user space as requested.
|
|
*/
|
|
if (softa->ipf_auth_used > 0) {
|
|
while (softa->ipf_auth_pkts[softa->ipf_auth_next] == NULL) {
|
|
softa->ipf_auth_next++;
|
|
if (softa->ipf_auth_next == softa->ipf_auth_size)
|
|
softa->ipf_auth_next = 0;
|
|
}
|
|
|
|
error = ipf_outobj(softc, data,
|
|
&softa->ipf_auth[softa->ipf_auth_next],
|
|
IPFOBJ_FRAUTH);
|
|
if (error != 0) {
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
return (error);
|
|
}
|
|
|
|
if (auth.fra_len != 0 && auth.fra_buf != NULL) {
|
|
/*
|
|
* Copy packet contents out to user space if
|
|
* requested. Bail on an error.
|
|
*/
|
|
m = softa->ipf_auth_pkts[softa->ipf_auth_next];
|
|
len = MSGDSIZE(m);
|
|
if (len > auth.fra_len)
|
|
len = auth.fra_len;
|
|
auth.fra_len = len;
|
|
|
|
for (t = auth.fra_buf; m && (len > 0); ) {
|
|
i = MIN(M_LEN(m), len);
|
|
error = copyoutptr(softc, MTOD(m, char *),
|
|
&t, i);
|
|
len -= i;
|
|
t += i;
|
|
if (error != 0) {
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
return (error);
|
|
}
|
|
m = m->m_next;
|
|
}
|
|
}
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&softa->ipf_authlk);
|
|
softa->ipf_auth_next++;
|
|
if (softa->ipf_auth_next == softa->ipf_auth_size)
|
|
softa->ipf_auth_next = 0;
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
|
|
return (0);
|
|
}
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
|
|
MUTEX_ENTER(&softa->ipf_auth_mx);
|
|
#ifdef _KERNEL
|
|
# if SOLARIS
|
|
error = 0;
|
|
if (!cv_wait_sig(&softa->ipf_auth_wait, &softa->ipf_auth_mx.ipf_lk)) {
|
|
IPFERROR(10014);
|
|
error = EINTR;
|
|
}
|
|
# else /* SOLARIS */
|
|
error = SLEEP(&softa->ipf_auth_next, "ipf_auth_next");
|
|
# endif /* SOLARIS */
|
|
#endif
|
|
MUTEX_EXIT(&softa->ipf_auth_mx);
|
|
if (error == 0)
|
|
goto ipf_auth_ioctlloop;
|
|
return (error);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_auth_reply */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: data(I) - pointer to data from ioctl call */
|
|
/* */
|
|
/* This function is called by an application when it wants to return a */
|
|
/* decision on a packet using the SIOCAUTHR ioctl. This is after it has */
|
|
/* received information using an SIOCAUTHW. The decision returned in the */
|
|
/* form of flags, the same as those used in each rule. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static int
|
|
ipf_auth_reply(ipf_main_softc_t *softc, ipf_auth_softc_t *softa, char *data)
|
|
{
|
|
frauth_t auth, *au = &auth, *fra;
|
|
fr_info_t fin;
|
|
int error, i;
|
|
mb_t *m;
|
|
SPL_INT(s);
|
|
|
|
error = ipf_inobj(softc, data, NULL, &auth, IPFOBJ_FRAUTH);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&softa->ipf_authlk);
|
|
|
|
i = au->fra_index;
|
|
fra = softa->ipf_auth + i;
|
|
error = 0;
|
|
|
|
/*
|
|
* Check the validity of the information being returned with two simple
|
|
* checks. First, the auth index value should be within the size of
|
|
* the array and second the packet id being returned should also match.
|
|
*/
|
|
if ((i < 0) || (i >= softa->ipf_auth_size)) {
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
IPFERROR(10015);
|
|
return (ESRCH);
|
|
}
|
|
if (fra->fra_info.fin_id != au->fra_info.fin_id) {
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
SPL_X(s);
|
|
IPFERROR(10019);
|
|
return (ESRCH);
|
|
}
|
|
|
|
m = softa->ipf_auth_pkts[i];
|
|
fra->fra_index = -2;
|
|
fra->fra_pass = au->fra_pass;
|
|
softa->ipf_auth_pkts[i] = NULL;
|
|
softa->ipf_auth_replies++;
|
|
bcopy(&fra->fra_info, &fin, sizeof(fin));
|
|
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
|
|
/*
|
|
* Re-insert the packet back into the packet stream flowing through
|
|
* the kernel in a manner that will mean IPFilter sees the packet
|
|
* again. This is not the same as is done with fastroute,
|
|
* deliberately, as we want to resume the normal packet processing
|
|
* path for it.
|
|
*/
|
|
#ifdef _KERNEL
|
|
if ((m != NULL) && (au->fra_info.fin_out != 0)) {
|
|
error = ipf_inject(&fin, m);
|
|
if (error != 0) {
|
|
IPFERROR(10016);
|
|
error = ENOBUFS;
|
|
softa->ipf_auth_stats.fas_sendfail++;
|
|
} else {
|
|
softa->ipf_auth_stats.fas_sendok++;
|
|
}
|
|
} else if (m) {
|
|
error = ipf_inject(&fin, m);
|
|
if (error != 0) {
|
|
IPFERROR(10017);
|
|
error = ENOBUFS;
|
|
softa->ipf_auth_stats.fas_quefail++;
|
|
} else {
|
|
softa->ipf_auth_stats.fas_queok++;
|
|
}
|
|
} else {
|
|
IPFERROR(10018);
|
|
error = EINVAL;
|
|
}
|
|
|
|
/*
|
|
* If we experience an error which will result in the packet
|
|
* not being processed, make sure we advance to the next one.
|
|
*/
|
|
if (error == ENOBUFS) {
|
|
WRITE_ENTER(&softa->ipf_authlk);
|
|
softa->ipf_auth_used--;
|
|
fra->fra_index = -1;
|
|
fra->fra_pass = 0;
|
|
if (i == softa->ipf_auth_start) {
|
|
while (fra->fra_index == -1) {
|
|
i++;
|
|
if (i == softa->ipf_auth_size)
|
|
i = 0;
|
|
softa->ipf_auth_start = i;
|
|
if (i == softa->ipf_auth_end)
|
|
break;
|
|
}
|
|
if (softa->ipf_auth_start == softa->ipf_auth_end) {
|
|
softa->ipf_auth_next = 0;
|
|
softa->ipf_auth_start = 0;
|
|
softa->ipf_auth_end = 0;
|
|
}
|
|
}
|
|
RWLOCK_EXIT(&softa->ipf_authlk);
|
|
}
|
|
#endif /* _KERNEL */
|
|
SPL_X(s);
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
u_32_t
|
|
ipf_auth_pre_scanlist(ipf_main_softc_t *softc, fr_info_t *fin, u_32_t pass)
|
|
{
|
|
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
|
|
|
|
if (softa->ipf_auth_ip != NULL)
|
|
return (ipf_scanlist(fin, softc->ipf_pass));
|
|
|
|
return (pass);
|
|
}
|
|
|
|
|
|
frentry_t **
|
|
ipf_auth_rulehead(ipf_main_softc_t *softc)
|
|
{
|
|
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
|
|
|
|
return (&softa->ipf_auth_ip);
|
|
}
|