/* * Copyright (C) 1998-2003 by Darren Reed & Guido van Rooij. * * See the IPFILTER.LICENCE file for details on licencing. */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #if defined(KERNEL) || defined(_KERNEL) # undef KERNEL # undef _KERNEL # define KERNEL 1 # define _KERNEL 1 #endif #include #include #include #include #include #if !defined(_KERNEL) # include # include # include # define _KERNEL # ifdef __OpenBSD__ struct file; # endif # include # undef _KERNEL #endif #if defined(_KERNEL) && (__FreeBSD_version >= 220000) # include # include #else # include #endif #if !defined(linux) # include #endif #include #if defined(_KERNEL) # include # if !defined(__SVR4) && !defined(__svr4__) && !defined(linux) # include # endif #endif #if defined(__SVR4) || defined(__svr4__) # include # include # ifdef _KERNEL # include # endif # include # include # include #endif #if (_BSDI_VERSION >= 199802) || (__FreeBSD_version >= 400000) # include #endif #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi) # include #endif #if defined(_KERNEL) && defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000) # include #endif #include #ifdef sun # include #endif #include #include #include #include #if !defined(_KERNEL) && !defined(__osf__) && !defined(__sgi) # define KERNEL # define _KERNEL # define NOT_KERNEL #endif #if !defined(linux) # include #endif #ifdef NOT_KERNEL # undef _KERNEL # undef KERNEL #endif #include #if defined(IRIX) && (IRIX < 60516) /* IRIX < 6 */ extern struct ifqueue ipintrq; /* ip packet input queue */ #else # if !defined(__hpux) && !defined(linux) # if __FreeBSD_version >= 300000 # include # if __FreeBSD_version >= 500042 # define IF_QFULL _IF_QFULL # define IF_DROP _IF_DROP # endif /* __FreeBSD_version >= 500042 */ # endif # include # include # endif #endif #include #include #include "netinet/ip_compat.h" #include #include "netinet/ip_fil.h" #include "netinet/ip_auth.h" #if !defined(MENTAT) && !defined(linux) # include # ifdef __FreeBSD__ # include # endif #endif #if (__FreeBSD_version >= 300000) # include # if defined(_KERNEL) && !defined(IPFILTER_LKM) # include # include # endif #endif /* END OF INCLUDES */ #if !defined(lint) static const char rcsid[] = "@(#)$Id: ip_auth.c,v 2.73.2.5 2005/06/12 07:18:14 darrenr Exp $"; #endif #if SOLARIS extern kcondvar_t ipfauthwait; #endif /* SOLARIS */ #if defined(linux) && defined(_KERNEL) wait_queue_head_t fr_authnext_linux; #endif int fr_authsize = FR_NUMAUTH; int fr_authused = 0; int fr_defaultauthage = 600; int fr_auth_lock = 0; int fr_auth_init = 0; fr_authstat_t fr_authstats; static frauth_t *fr_auth = NULL; mb_t **fr_authpkts = NULL; int fr_authstart = 0, fr_authend = 0, fr_authnext = 0; frauthent_t *fae_list = NULL; frentry_t *ipauth = NULL, *fr_authlist = NULL; #if SOLARIS2 >= 10 extern net_data_t ipf_ipv4; extern net_data_t ipf_ipv6; #endif int fr_authinit() { KMALLOCS(fr_auth, frauth_t *, fr_authsize * sizeof(*fr_auth)); if (fr_auth != NULL) bzero((char *)fr_auth, fr_authsize * sizeof(*fr_auth)); else return -1; KMALLOCS(fr_authpkts, mb_t **, fr_authsize * sizeof(*fr_authpkts)); if (fr_authpkts != NULL) bzero((char *)fr_authpkts, fr_authsize * sizeof(*fr_authpkts)); else return -2; MUTEX_INIT(&ipf_authmx, "ipf auth log mutex"); RWLOCK_INIT(&ipf_auth, "ipf IP User-Auth rwlock"); #if SOLARIS && defined(_KERNEL) cv_init(&ipfauthwait, "ipf auth condvar", CV_DRIVER, NULL); #endif #if defined(linux) && defined(_KERNEL) init_waitqueue_head(&fr_authnext_linux); #endif fr_auth_init = 1; return 0; } /* * Check if a packet has authorization. If the packet is found to match an * authorization result and that would result in a feedback loop (i.e. it * will end up returning FR_AUTH) then return FR_BLOCK instead. */ frentry_t *fr_checkauth(fin, passp) fr_info_t *fin; u_32_t *passp; { frentry_t *fr; frauth_t *fra; u_32_t pass; u_short id; ip_t *ip; int i; if (fr_auth_lock || !fr_authused) return NULL; ip = fin->fin_ip; id = ip->ip_id; READ_ENTER(&ipf_auth); for (i = fr_authstart; i != fr_authend; ) { /* * index becomes -2 only after an SIOCAUTHW. Check this in * case the same packet gets sent again and it hasn't yet been * auth'd. */ fra = fr_auth + i; if ((fra->fra_index == -2) && (id == fra->fra_info.fin_id) && !bcmp((char *)fin, (char *)&fra->fra_info, FI_CSIZE)) { /* * Avoid feedback loop. */ if (!(pass = fra->fra_pass) || (FR_ISAUTH(pass))) pass = FR_BLOCK; /* * Create a dummy rule for the stateful checking to * use and return. Zero out any values we don't * trust from userland! */ if ((pass & FR_KEEPSTATE) || ((pass & FR_KEEPFRAG) && (fin->fin_flx & FI_FRAG))) { KMALLOC(fr, frentry_t *); if (fr) { bcopy((char *)fra->fra_info.fin_fr, (char *)fr, sizeof(*fr)); fr->fr_grp = NULL; fr->fr_ifa = fin->fin_ifp; fr->fr_func = NULL; fr->fr_ref = 1; fr->fr_flags = pass; fr->fr_ifas[1] = NULL; fr->fr_ifas[2] = NULL; fr->fr_ifas[3] = NULL; } } else fr = fra->fra_info.fin_fr; fin->fin_fr = fr; RWLOCK_EXIT(&ipf_auth); WRITE_ENTER(&ipf_auth); if ((fr != NULL) && (fr != fra->fra_info.fin_fr)) { fr->fr_next = fr_authlist; fr_authlist = fr; } fr_authstats.fas_hits++; fra->fra_index = -1; fr_authused--; 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 = fr_authend = 0; } } RWLOCK_EXIT(&ipf_auth); if (passp != NULL) *passp = pass; ATOMIC_INC64(fr_authstats.fas_hits); return fr; } i++; if (i == fr_authsize) i = 0; } fr_authstats.fas_miss++; RWLOCK_EXIT(&ipf_auth); ATOMIC_INC64(fr_authstats.fas_miss); return NULL; } /* * Check if we have room in the auth array to hold details for another packet. * If we do, store it and wake up any user programs which are waiting to * hear about these events. */ int fr_newauth(m, fin) mb_t *m; fr_info_t *fin; { #if defined(_KERNEL) && defined(MENTAT) qpktinfo_t *qpi = fin->fin_qpi; #endif frauth_t *fra; #if !defined(sparc) && !defined(m68k) ip_t *ip; #endif int i; if (fr_auth_lock) return 0; WRITE_ENTER(&ipf_auth); if (fr_authstart > fr_authend) { fr_authstats.fas_nospace++; RWLOCK_EXIT(&ipf_auth); return 0; } else { if (fr_authused == fr_authsize) { fr_authstats.fas_nospace++; RWLOCK_EXIT(&ipf_auth); return 0; } } fr_authstats.fas_added++; fr_authused++; i = fr_authend++; if (fr_authend == fr_authsize) fr_authend = 0; RWLOCK_EXIT(&ipf_auth); fra = fr_auth + i; fra->fra_index = i; fra->fra_pass = 0; fra->fra_age = fr_defaultauthage; bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin)); #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 defined(MENTAT) && 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) m->b_rptr -= qpi->qpi_off; fr_authpkts[i] = *(mblk_t **)fin->fin_mp; cv_signal(&ipfauthwait); #else # if defined(BSD) && !defined(sparc) && (BSD >= 199306) if (!fin->fin_out) { ip->ip_len = htons(ip->ip_len); ip->ip_off = htons(ip->ip_off); } # endif fr_authpkts[i] = m; WAKEUP(&fr_authnext,0); #endif return 1; } int fr_auth_ioctl(data, cmd, mode) caddr_t data; ioctlcmd_t cmd; int mode; { mb_t *m; #if defined(_KERNEL) && !defined(MENTAT) && !defined(linux) && \ (!defined(__FreeBSD_version) || (__FreeBSD_version < 501000)) struct ifqueue *ifq; SPL_INT(s); #endif frauth_t auth, *au = &auth, *fra; int i, error = 0, len; char *t; net_data_t net_data_p; net_inject_t inj_data; int ret; switch (cmd) { case SIOCSTLCK : if (!(mode & FWRITE)) { error = EPERM; break; } fr_lock(data, &fr_auth_lock); break; case SIOCATHST: fr_authstats.fas_faelist = fae_list; error = fr_outobj(data, &fr_authstats, IPFOBJ_AUTHSTAT); break; case SIOCIPFFL: SPL_NET(s); WRITE_ENTER(&ipf_auth); i = fr_authflush(); RWLOCK_EXIT(&ipf_auth); SPL_X(s); error = copyoutptr((char *)&i, data, sizeof(i)); break; case SIOCAUTHW: fr_authioctlloop: error = fr_inobj(data, au, IPFOBJ_FRAUTH); READ_ENTER(&ipf_auth); if ((fr_authnext != fr_authend) && fr_authpkts[fr_authnext]) { error = fr_outobj(data, &fr_auth[fr_authnext], IPFOBJ_FRAUTH); 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) break; } } RWLOCK_EXIT(&ipf_auth); if (error != 0) break; 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); /* * We exit ipf_global here because a program that enters in * here will have a lock on it and goto sleep having this lock. * If someone were to do an 'ipf -D' the system would then * deadlock. The catch with releasing it here is that the * caller of this function expects it to be held when we * return so we have to reacquire it in here. */ RWLOCK_EXIT(&ipf_global); 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); READ_ENTER(&ipf_global); if (error == 0) { READ_ENTER(&ipf_auth); goto fr_authioctlloop; } break; case SIOCAUTHR: error = fr_inobj(data, &auth, IPFOBJ_FRAUTH); if (error != 0) return error; SPL_NET(s); WRITE_ENTER(&ipf_auth); i = au->fra_index; fra = fr_auth + i; 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; RWLOCK_EXIT(&ipf_auth); #ifdef _KERNEL if (fra->fra_info.fin_v == 4) { net_data_p = ipf_ipv4; } else if (fra->fra_info.fin_v == 6) { net_data_p = ipf_ipv6; } else { return (-1); } /* * We're putting the packet back on the same interface * queue that it was originally seen on so that it can * progress through the system properly, with the result * of the auth check done. */ inj_data.ni_physical = (phy_if_t)fra->fra_info.fin_ifp; if ((m != NULL) && (au->fra_info.fin_out != 0)) { # ifdef MENTAT inj_data.ni_packet = m; ret = net_inject(net_data_p, NI_QUEUE_OUT, &inj_data); if (ret < 0) fr_authstats.fas_sendfail++; else fr_authstats.fas_sendok++; # else /* MENTAT */ # if defined(linux) || defined(AIX) # else # if (_BSDI_VERSION >= 199802) || defined(__OpenBSD__) || \ (defined(__sgi) && (IRIX >= 60500) || defined(AIX) || \ (defined(__FreeBSD__) && (__FreeBSD_version >= 470102))) error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); # else error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL); # endif if (error != 0) fr_authstats.fas_sendfail++; else fr_authstats.fas_sendok++; # endif /* Linux */ # endif /* MENTAT */ } else if (m) { # ifdef MENTAT inj_data.ni_packet = m; ret = net_inject(net_data_p, NI_QUEUE_IN, &inj_data); # else /* MENTAT */ # if defined(linux) || defined(AIX) # else # if (__FreeBSD_version >= 501000) netisr_dispatch(NETISR_IP, m); # else # if (IRIX >= 60516) ifq = &((struct ifnet *)fra->fra_info.fin_ifp)->if_snd; # else ifq = &ipintrq; # endif if (IF_QFULL(ifq)) { IF_DROP(ifq); FREE_MB_T(m); error = ENOBUFS; } else { IF_ENQUEUE(ifq, m); # if IRIX < 60500 schednetisr(NETISR_IP); # endif } # endif # endif /* Linux */ # endif /* MENTAT */ if (error != 0) fr_authstats.fas_quefail++; else fr_authstats.fas_queok++; } else error = EINVAL; # ifdef MENTAT if (error != 0) error = EINVAL; # else /* MENTAT */ /* * 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) { fr_authused--; fra->fra_index = -1; fra->fra_pass = 0; if (i == fr_authstart) { while (fra->fra_index == -1) { i++; if (i == fr_authsize) i = 0; fr_authstart = i; if (i == fr_authend) break; } if (fr_authstart == fr_authend) { fr_authnext = 0; fr_authstart = fr_authend = 0; } } } # endif /* MENTAT */ #endif /* _KERNEL */ SPL_X(s); break; default : error = EINVAL; break; } return error; } /* * Free all network buffer memory used to keep saved packets. */ void fr_authunload() { register int i; 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; } } /* * Slowly expire held auth records. Timeouts are set * in expectation of this being called twice per second. */ void fr_authexpire() { register int i; register frauth_t *fra; register frauthent_t *fae, **faep; register frentry_t *fr, **frp; mb_t *m; 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) && (m = fr_authpkts[i])) { FREE_MB_T(m); fr_authpkts[i] = NULL; fr_auth[i].fra_index = -1; fr_authstats.fas_expire++; fr_authused--; } } for (faep = &fae_list; ((fae = *faep) != NULL); ) { fae->fae_age--; if (fae->fae_age == 0) { *faep = fae->fae_next; KFREE(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); } 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; *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; } /* * Flush held packets. * Must already be properly SPL'ed and Locked on &ipf_auth. * */ 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++) { 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++; fr_authused--; num_flushed++; } } fr_authstart = 0; fr_authend = 0; fr_authnext = 0; return num_flushed; }