1102 lines
29 KiB
C
1102 lines
29 KiB
C
/* $NetBSD: ip_auth.c,v 1.16 2010/08/11 11:57:36 pgoyette Exp $ */
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/*
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* Copyright (C) 1998-2003 by Darren Reed & Guido van Rooij.
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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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* Copyright 2008 Sun Microsystems, Inc.
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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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# include <string.h>
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# define _KERNEL
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# ifdef __OpenBSD__
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struct file;
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# endif
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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) && (__FreeBSD_version >= 220000)
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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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#if !defined(linux)
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# include <sys/protosw.h>
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#endif
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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) && !defined(__svr4__) && !defined(linux)
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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) || 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(_BSDI_VERSION) && (_BSDI_VERSION >= 199802)) || \
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(defined(__FreeBSD_version) &&(__FreeBSD_version >= 400000))
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# include <sys/queue.h>
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#endif
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#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi)
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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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#include <net/if.h>
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#include <net/route.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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#if !defined(_KERNEL) && !defined(__osf__) && !defined(__sgi)
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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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#if !defined(linux)
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# include <netinet/ip_var.h>
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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(IRIX) && (IRIX < 60516) /* IRIX < 6 */
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extern struct ifqueue ipintrq; /* ip packet input queue */
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#else
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# if !defined(__hpux) && !defined(linux)
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# if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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# if __FreeBSD_version >= 500042
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# define IF_QFULL _IF_QFULL
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# define IF_DROP _IF_DROP
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# endif /* __FreeBSD_version >= 500042 */
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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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# endif
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#endif
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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 !defined(MENTAT) && !defined(linux)
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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 (__FreeBSD_version >= 300000)
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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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#if defined(__NetBSD__)
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ip_auth.c,v 1.16 2010/08/11 11:57:36 pgoyette Exp $");
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#else
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static const char rcsid[] = "@(#)Id: ip_auth.c,v 2.73.2.34 2010/01/31 16:22:54 darrenr Exp";
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#endif
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#endif
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#if SOLARIS && defined(_KERNEL)
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extern kcondvar_t ipfauthwait;
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extern struct pollhead iplpollhead[IPL_LOGSIZE];
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#endif /* SOLARIS */
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#if defined(linux) && defined(_KERNEL)
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wait_queue_head_t fr_authnext_linux;
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#endif
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int fr_authsize = FR_NUMAUTH;
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int fr_authused = 0;
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int fr_authreplies = 0;
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int fr_defaultauthage = 600;
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int fr_auth_lock = 0;
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int fr_auth_init = 0;
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fr_authstat_t fr_authstats;
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static frauth_t *fr_auth = NULL;
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mb_t **fr_authpkts = NULL;
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int fr_authstart = 0, fr_authend = 0, fr_authnext = 0;
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frauthent_t *fae_list = NULL;
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frentry_t *ipauth = NULL,
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*fr_authlist = NULL;
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void fr_authderef __P((frauthent_t **));
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int fr_authgeniter __P((ipftoken_t *, ipfgeniter_t *, ipfobj_t *));
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int fr_authreply __P((char *));
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int fr_authwait __P((char *));
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/* ------------------------------------------------------------------------ */
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/* Function: fr_authinit */
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/* Returns: int - 0 == success, else error */
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/* Parameters: None */
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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 fr_authinit()
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{
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KMALLOCS(fr_auth, frauth_t *, fr_authsize * sizeof(*fr_auth));
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if (fr_auth != NULL)
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bzero((char *)fr_auth, fr_authsize * sizeof(*fr_auth));
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else
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return -1;
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KMALLOCS(fr_authpkts, mb_t **, fr_authsize * sizeof(*fr_authpkts));
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if (fr_authpkts != NULL)
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bzero((char *)fr_authpkts, fr_authsize * sizeof(*fr_authpkts));
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else
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return -2;
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MUTEX_INIT(&ipf_authmx, "ipf auth log mutex");
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RWLOCK_INIT(&ipf_auth, "ipf IP User-Auth rwlock");
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#if SOLARIS && defined(_KERNEL)
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cv_init(&ipfauthwait, "ipf auth condvar", CV_DRIVER, NULL);
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#endif
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#if defined(linux) && defined(_KERNEL)
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init_waitqueue_head(&fr_authnext_linux);
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#endif
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fr_auth_init = 1;
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: fr_checkauth */
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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 *fr_checkauth(fin, passp)
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fr_info_t *fin;
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u_32_t *passp;
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{
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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 (fr_auth_lock || !fr_authused)
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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(&ipf_auth);
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for (i = fr_authstart; i != fr_authend; ) {
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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 = fr_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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/*
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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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}
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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(&ipf_auth);
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WRITE_ENTER(&ipf_auth);
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/*
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* fr_authlist 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 = fr_authlist;
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fr_authlist = fr;
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}
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fr_authstats.fas_hits++;
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fra->fra_index = -1;
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fr_authused--;
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fr_authreplies--;
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if (i == fr_authstart) {
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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 == fr_authsize) {
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i = 0;
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fra = fr_auth;
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}
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fr_authstart = i;
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if (i == fr_authend)
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break;
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}
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if (fr_authstart == fr_authend) {
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fr_authnext = 0;
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fr_authstart = 0;
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fr_authend = 0;
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}
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}
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RWLOCK_EXIT(&ipf_auth);
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if (passp != NULL)
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*passp = pass;
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ATOMIC_INC64(fr_authstats.fas_hits);
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return fr;
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}
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i++;
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if (i == fr_authsize)
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i = 0;
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}
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fr_authstats.fas_miss++;
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RWLOCK_EXIT(&ipf_auth);
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ATOMIC_INC64(fr_authstats.fas_miss);
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return NULL;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: fr_newauth */
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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 fr_newauth(m, fin)
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mb_t *m;
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fr_info_t *fin;
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{
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#if defined(_KERNEL) && defined(MENTAT)
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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 (fr_auth_lock)
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return 0;
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WRITE_ENTER(&ipf_auth);
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if (((fr_authend + 1) % fr_authsize) == fr_authstart) {
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fr_authstats.fas_nospace++;
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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}
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fr_authstats.fas_added++;
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fr_authused++;
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i = fr_authend++;
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if (fr_authend == fr_authsize)
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fr_authend = 0;
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fra = fr_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 = fr_defaultauthage;
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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);
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#if !defined(sparc) && !defined(m68k)
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/*
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* No need to copyback here as we want to undo the changes, not keep
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* them.
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*/
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ip = fin->fin_ip;
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# if defined(MENTAT) && defined(_KERNEL)
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if ((ip == (ip_t *)m->b_rptr) && (fin->fin_v == 4))
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# endif
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{
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register u_short bo;
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bo = ip->ip_len;
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ip->ip_len = htons(bo);
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bo = ip->ip_off;
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ip->ip_off = htons(bo);
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}
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#endif
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#if SOLARIS && defined(_KERNEL)
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COPYIFNAME(fin->fin_v, fin->fin_ifp, fra->fra_info.fin_ifname);
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m->b_rptr -= qpi->qpi_off;
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# if !defined(_INET_IP_STACK_H)
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fra->fra_q = qpi->qpi_q; /* The queue can disappear! */
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# endif
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fra->fra_m = *fin->fin_mp;
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fra->fra_info.fin_mp = &fra->fra_m;
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fr_authpkts[i] = fra->fra_m;
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RWLOCK_EXIT(&ipf_auth);
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cv_signal(&ipfauthwait);
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pollwakeup(&iplpollhead[IPL_LOGAUTH], POLLIN|POLLRDNORM);
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#else
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fr_authpkts[i] = m;
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RWLOCK_EXIT(&ipf_auth);
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WAKEUP(&fr_authnext, 0);
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#endif
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return 1;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: fr_auth_ioctl */
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/* Returns: int - 0 == success, else error */
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/* Parameters: data(IO) - pointer to ioctl data */
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/* cmd(I) - ioctl command */
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/* mode(I) - mode flags associated with open descriptor */
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/* uid(I) - uid associatd with application making the call */
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/* ctx(I) - pointer for context */
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/* */
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/* This function handles all of the ioctls recognised by the auth component */
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/* in IPFilter - ie ioctls called on an open fd for /dev/ipauth */
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/* ------------------------------------------------------------------------ */
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int fr_auth_ioctl(data, cmd, mode, uid, ctx)
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void *data;
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ioctlcmd_t cmd;
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int mode, uid;
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void *ctx;
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{
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int error = 0, i;
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SPL_INT(s);
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switch (cmd)
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{
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case SIOCGENITER :
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{
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ipftoken_t *token;
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ipfgeniter_t iter;
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ipfobj_t obj;
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error = fr_inobj(data, &obj, &iter, IPFOBJ_GENITER);
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if (error != 0)
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break;
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SPL_SCHED(s);
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token = ipf_findtoken(IPFGENITER_AUTH, uid, ctx);
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if (token != NULL) {
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error = fr_authgeniter(token, &iter, &obj);
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WRITE_ENTER(&ipf_tokens);
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if (token->ipt_data == NULL)
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ipf_freetoken(token);
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else
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ipf_dereftoken(token);
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RWLOCK_EXIT(&ipf_tokens);
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} else {
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error = ESRCH;
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}
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SPL_X(s);
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break;
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}
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case SIOCADAFR :
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case SIOCRMAFR :
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if (!(mode & FWRITE))
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error = EPERM;
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else
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error = frrequest(IPL_LOGAUTH, cmd, data,
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fr_active, 1);
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break;
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case SIOCSTLCK :
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if (!(mode & FWRITE)) {
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error = EPERM;
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break;
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}
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error = fr_lock(data, &fr_auth_lock);
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break;
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case SIOCATHST:
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fr_authstats.fas_faelist = fae_list;
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error = fr_outobj(data, &fr_authstats, IPFOBJ_AUTHSTAT);
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break;
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case SIOCIPFFL:
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SPL_NET(s);
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WRITE_ENTER(&ipf_auth);
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i = fr_authflush();
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RWLOCK_EXIT(&ipf_auth);
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SPL_X(s);
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BCOPYOUT((char *)&i, data, sizeof(i));
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break;
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case SIOCAUTHW:
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error = fr_authwait(data);
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break;
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case SIOCAUTHR:
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error = fr_authreply(data);
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break;
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default :
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error = EINVAL;
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break;
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}
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return error;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: fr_authunload */
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/* Returns: None */
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/* Parameters: None */
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/* */
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/* Free all network buffer memory used to keep saved packets. */
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/* ------------------------------------------------------------------------ */
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void fr_authunload()
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{
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register int i;
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register frauthent_t *fae, **faep;
|
|
frentry_t *fr, **frp;
|
|
mb_t *m;
|
|
|
|
if (fr_auth != NULL) {
|
|
KFREES(fr_auth, fr_authsize * sizeof(*fr_auth));
|
|
fr_auth = NULL;
|
|
}
|
|
|
|
if (fr_authpkts != NULL) {
|
|
for (i = 0; i < fr_authsize; i++) {
|
|
m = fr_authpkts[i];
|
|
if (m != NULL) {
|
|
FREE_MB_T(m);
|
|
fr_authpkts[i] = NULL;
|
|
}
|
|
}
|
|
KFREES(fr_authpkts, fr_authsize * sizeof(*fr_authpkts));
|
|
fr_authpkts = NULL;
|
|
}
|
|
|
|
faep = &fae_list;
|
|
while ((fae = *faep) != NULL) {
|
|
*faep = fae->fae_next;
|
|
KFREE(fae);
|
|
}
|
|
ipauth = NULL;
|
|
|
|
if (fr_authlist != NULL) {
|
|
for (frp = &fr_authlist; ((fr = *frp) != NULL); ) {
|
|
if (fr->fr_ref == 1) {
|
|
*frp = fr->fr_next;
|
|
KFREE(fr);
|
|
} else
|
|
frp = &fr->fr_next;
|
|
}
|
|
}
|
|
|
|
if (fr_auth_init == 1) {
|
|
# if SOLARIS && defined(_KERNEL)
|
|
cv_destroy(&ipfauthwait);
|
|
# endif
|
|
MUTEX_DESTROY(&ipf_authmx);
|
|
RW_DESTROY(&ipf_auth);
|
|
|
|
fr_auth_init = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_authexpire */
|
|
/* Returns: None */
|
|
/* Parameters: None */
|
|
/* */
|
|
/* Slowly expire held auth records. Timeouts are set in expectation of */
|
|
/* this being called twice per second. */
|
|
/* ------------------------------------------------------------------------ */
|
|
void fr_authexpire()
|
|
{
|
|
frauthent_t *fae, **faep;
|
|
frentry_t *fr, **frp;
|
|
frauth_t *fra;
|
|
mb_t *m;
|
|
int i;
|
|
SPL_INT(s);
|
|
|
|
if (fr_auth_lock)
|
|
return;
|
|
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&ipf_auth);
|
|
for (i = 0, fra = fr_auth; i < fr_authsize; i++, fra++) {
|
|
fra->fra_age--;
|
|
if ((fra->fra_age == 0) && (fr_auth[i].fra_index != -1)) {
|
|
if ((m = fr_authpkts[i]) != NULL) {
|
|
FREE_MB_T(m);
|
|
fr_authpkts[i] = NULL;
|
|
} else if (fr_auth[i].fra_index == -2) {
|
|
fr_authreplies--;
|
|
}
|
|
|
|
fr_auth[i].fra_index = -1;
|
|
fr_authstats.fas_expire++;
|
|
fr_authused--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Expire pre-auth rules
|
|
*/
|
|
for (faep = &fae_list; ((fae = *faep) != NULL); ) {
|
|
fae->fae_age--;
|
|
if (fae->fae_age == 0) {
|
|
fr_authderef(&fae);
|
|
fr_authstats.fas_expire++;
|
|
} else
|
|
faep = &fae->fae_next;
|
|
}
|
|
if (fae_list != NULL)
|
|
ipauth = &fae_list->fae_fr;
|
|
else
|
|
ipauth = NULL;
|
|
|
|
for (frp = &fr_authlist; ((fr = *frp) != NULL); ) {
|
|
if (fr->fr_ref == 1) {
|
|
*frp = fr->fr_next;
|
|
KFREE(fr);
|
|
} else
|
|
frp = &fr->fr_next;
|
|
}
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_preauthcmd */
|
|
/* 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 fr_preauthcmd(cmd, fr, frptr)
|
|
ioctlcmd_t cmd;
|
|
frentry_t *fr, **frptr;
|
|
{
|
|
frauthent_t *fae, **faep;
|
|
int error = 0;
|
|
SPL_INT(s);
|
|
|
|
if ((cmd != SIOCADAFR) && (cmd != SIOCRMAFR))
|
|
return EIO;
|
|
|
|
for (faep = &fae_list; ((fae = *faep) != NULL); ) {
|
|
if (&fae->fae_fr == fr)
|
|
break;
|
|
else
|
|
faep = &fae->fae_next;
|
|
}
|
|
|
|
if (cmd == (ioctlcmd_t)SIOCRMAFR) {
|
|
if (fr == NULL || frptr == NULL)
|
|
error = EINVAL;
|
|
else if (fae == NULL)
|
|
error = ESRCH;
|
|
else {
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&ipf_auth);
|
|
*faep = fae->fae_next;
|
|
if (ipauth == &fae->fae_fr)
|
|
ipauth = fae_list ? &fae_list->fae_fr : NULL;
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
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(&ipf_auth);
|
|
fae->fae_age = fr_defaultauthage;
|
|
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;
|
|
ipauth = &fae_list->fae_fr;
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
} else
|
|
error = ENOMEM;
|
|
} else
|
|
error = EINVAL;
|
|
return error;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_authflush */
|
|
/* Returns: int - number of auth entries flushed */
|
|
/* Parameters: None */
|
|
/* Locks: WRITE(ipf_auth) */
|
|
/* */
|
|
/* This function flushs the fr_authpkts 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. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int fr_authflush()
|
|
{
|
|
register int i, num_flushed;
|
|
mb_t *m;
|
|
|
|
if (fr_auth_lock)
|
|
return -1;
|
|
|
|
num_flushed = 0;
|
|
|
|
for (i = 0 ; i < fr_authsize; i++) {
|
|
if (fr_auth[i].fra_index != -1) {
|
|
m = fr_authpkts[i];
|
|
if (m != NULL) {
|
|
FREE_MB_T(m);
|
|
fr_authpkts[i] = NULL;
|
|
}
|
|
|
|
fr_auth[i].fra_index = -1;
|
|
/* perhaps add & use a flush counter inst.*/
|
|
fr_authstats.fas_expire++;
|
|
num_flushed++;
|
|
}
|
|
}
|
|
|
|
fr_authstart = 0;
|
|
fr_authend = 0;
|
|
fr_authnext = 0;
|
|
fr_authused = 0;
|
|
fr_authreplies = 0;
|
|
|
|
return num_flushed;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_auth_waiting */
|
|
/* Returns: int - 0 = no pakcets wiating, 1 = packets waiting. */
|
|
/* Parameters: None */
|
|
/* */
|
|
/* Simple truth check to see if there are any packets waiting in the auth */
|
|
/* queue. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int fr_auth_waiting()
|
|
{
|
|
return (fr_authused != 0);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_authgeniter */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: token(I) - pointer to ipftoken structure */
|
|
/* itp(I) - pointer to ipfgeniter structure */
|
|
/* */
|
|
/* ------------------------------------------------------------------------ */
|
|
int fr_authgeniter(token, itp, obj)
|
|
ipftoken_t *token;
|
|
ipfgeniter_t *itp;
|
|
ipfobj_t *obj;
|
|
{
|
|
frauthent_t *fae, *next, zero;
|
|
int error;
|
|
|
|
if (itp->igi_data == NULL)
|
|
return EFAULT;
|
|
|
|
if (itp->igi_type != IPFGENITER_AUTH)
|
|
return EINVAL;
|
|
|
|
obj->ipfo_type = IPFOBJ_FRAUTH;
|
|
obj->ipfo_ptr = itp->igi_data;
|
|
obj->ipfo_size = sizeof(frauth_t);
|
|
|
|
READ_ENTER(&ipf_auth);
|
|
|
|
/*
|
|
* Retrieve "previous" entry from token and find the next entry.
|
|
*/
|
|
fae = token->ipt_data;
|
|
if (fae == NULL) {
|
|
next = fae_list;
|
|
} else {
|
|
next = fae->fae_next;
|
|
}
|
|
|
|
/*
|
|
* If we found an entry, add reference to it and update token.
|
|
* Otherwise, zero out data to be returned and NULL out token.
|
|
*/
|
|
if (next != NULL) {
|
|
ATOMIC_INC(next->fae_ref);
|
|
token->ipt_data = next;
|
|
} else {
|
|
bzero(&zero, sizeof(zero));
|
|
next = &zero;
|
|
token->ipt_data = NULL;
|
|
}
|
|
|
|
/*
|
|
* Safe to release the lock now that we have a reference.
|
|
*/
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
|
|
/*
|
|
* Copy out the data and clean up references and token as needed.
|
|
*/
|
|
error = fr_outobjk(obj, next);
|
|
if (error != 0)
|
|
error = EFAULT;
|
|
|
|
/*
|
|
* Clean up reference and token.
|
|
*/
|
|
if (token->ipt_data != NULL) {
|
|
if (fae != NULL) {
|
|
WRITE_ENTER(&ipf_auth);
|
|
fr_authderef(&fae);
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
}
|
|
if (next->fae_next == NULL)
|
|
token->ipt_data = NULL;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_authderef */
|
|
/* Returns: None */
|
|
/* Parameters: faep(IO) - pointer to caller's frauthent_t pointer */
|
|
/* Locks: WRITE(ipf_auth) */
|
|
/* */
|
|
/* 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. */
|
|
/* ------------------------------------------------------------------------ */
|
|
void fr_authderef(faep)
|
|
frauthent_t **faep;
|
|
{
|
|
frauthent_t *fae;
|
|
|
|
fae = *faep;
|
|
*faep = NULL;
|
|
|
|
fae->fae_ref--;
|
|
if (fae->fae_ref == 0) {
|
|
KFREE(fae);
|
|
}
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_authwait */
|
|
/* 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 (fr_authpkts) then we go to */
|
|
/* sleep. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int fr_authwait(data)
|
|
char *data;
|
|
{
|
|
frauth_t auth, *au = &auth;
|
|
int error, len, i;
|
|
mb_t *m;
|
|
char *t;
|
|
SPL_INT(s);
|
|
|
|
fr_authioctlloop:
|
|
error = fr_inobj(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(&ipf_auth);
|
|
|
|
/*
|
|
* If fr_authnext is not equal to fr_authend it will be because there
|
|
* is a packet waiting to be delt with in the fr_authpkts array. We
|
|
* copy as much of that out to user space as requested.
|
|
*/
|
|
if (fr_authused > fr_authreplies) {
|
|
while (fr_authpkts[fr_authnext] == NULL) {
|
|
fr_authnext++;
|
|
if (fr_authnext == fr_authsize)
|
|
fr_authnext = 0;
|
|
}
|
|
|
|
error = fr_outobj(data, &fr_auth[fr_authnext], IPFOBJ_FRAUTH);
|
|
if (error != 0) {
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
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 = fr_authpkts[fr_authnext];
|
|
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(MTOD(m, char *), &t, i);
|
|
len -= i;
|
|
t += i;
|
|
if (error != 0) {
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
return error;
|
|
}
|
|
m = m->m_next;
|
|
}
|
|
}
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&ipf_auth);
|
|
fr_authnext++;
|
|
if (fr_authnext == fr_authsize)
|
|
fr_authnext = 0;
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
|
|
return 0;
|
|
}
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
|
|
MUTEX_ENTER(&ipf_authmx);
|
|
#ifdef _KERNEL
|
|
# if SOLARIS
|
|
error = 0;
|
|
if (!cv_wait_sig(&ipfauthwait, &ipf_authmx.ipf_lk))
|
|
error = EINTR;
|
|
# else /* SOLARIS */
|
|
# ifdef __hpux
|
|
{
|
|
lock_t *l;
|
|
|
|
l = get_sleep_lock(&fr_authnext);
|
|
error = sleep(&fr_authnext, PZERO+1);
|
|
spinunlock(l);
|
|
}
|
|
# else
|
|
# ifdef __osf__
|
|
error = mpsleep(&fr_authnext, PSUSP|PCATCH, "fr_authnext", 0,
|
|
&ipf_authmx, MS_LOCK_SIMPLE);
|
|
# else
|
|
error = SLEEP(&fr_authnext, "fr_authnext");
|
|
# endif /* __osf__ */
|
|
# endif /* __hpux */
|
|
# endif /* SOLARIS */
|
|
#endif
|
|
MUTEX_EXIT(&ipf_authmx);
|
|
if (error == 0)
|
|
goto fr_authioctlloop;
|
|
return error;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_authreply */
|
|
/* 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. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int fr_authreply(data)
|
|
char *data;
|
|
{
|
|
frauth_t auth, *au = &auth, *fra;
|
|
fr_info_t fin;
|
|
int error, i;
|
|
mb_t *m;
|
|
SPL_INT(s);
|
|
|
|
error = fr_inobj(data, NULL, &auth, IPFOBJ_FRAUTH);
|
|
if (error != 0)
|
|
return error;
|
|
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&ipf_auth);
|
|
|
|
i = au->fra_index;
|
|
fra = fr_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 >= fr_authsize) ||
|
|
(fra->fra_info.fin_id != au->fra_info.fin_id)) {
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
return ESRCH;
|
|
}
|
|
|
|
m = fr_authpkts[i];
|
|
fra->fra_index = -2;
|
|
fra->fra_pass = au->fra_pass;
|
|
fr_authpkts[i] = NULL;
|
|
fr_authreplies++;
|
|
bcopy(&fra->fra_info, &fin, sizeof(fin));
|
|
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
|
|
/*
|
|
* 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) {
|
|
error = ENOBUFS;
|
|
fr_authstats.fas_sendfail++;
|
|
} else {
|
|
fr_authstats.fas_sendok++;
|
|
}
|
|
} else if (m) {
|
|
error = ipf_inject(&fin, m);
|
|
if (error != 0) {
|
|
error = ENOBUFS;
|
|
fr_authstats.fas_quefail++;
|
|
} else {
|
|
fr_authstats.fas_queok++;
|
|
}
|
|
} else {
|
|
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(&ipf_auth);
|
|
/*
|
|
* Check that the queue item has not been flushed
|
|
* (and possible reused) yet.
|
|
*/
|
|
if ((fra->fra_index == -2) &&
|
|
!bcmp((char *)&fin, (char *)&fra->fra_info, sizeof(fin))) {
|
|
fr_authused--;
|
|
fr_authreplies--;
|
|
fra->fra_index = -1;
|
|
fra->fra_pass = 0;
|
|
if (i == fr_authstart) {
|
|
while (fra->fra_index == -1) {
|
|
i++;
|
|
fra++;
|
|
if (i == fr_authsize) {
|
|
i = 0;
|
|
fra = fr_auth;
|
|
}
|
|
fr_authstart = i;
|
|
if (i == fr_authend)
|
|
break;
|
|
}
|
|
if (fr_authstart == fr_authend) {
|
|
fr_authnext = 0;
|
|
fr_authstart = 0;
|
|
fr_authend = 0;
|
|
}
|
|
}
|
|
}
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
}
|
|
#endif /* _KERNEL */
|
|
SPL_X(s);
|
|
|
|
return 0;
|
|
}
|