/* $FreeBSD$ */ /* * Copyright (C) 2012 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. */ #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 # ifdef _STDC_C99 # include # endif # include # define _KERNEL # include # undef _KERNEL #endif #if defined(_KERNEL) && defined(__FreeBSD_version) # include # include #else # include #endif # include #include #if defined(_KERNEL) # include # if !defined(__SVR4) # include # endif #endif #if defined(__SVR4) # include # include # ifdef _KERNEL # include # endif # include # include #endif #if defined(__FreeBSD_version) # include #endif #if defined(__NetBSD__) # include #endif #if defined(_KERNEL) && defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000) # include #endif #if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 400000) && \ !defined(_KERNEL) # include #endif #include #ifdef sun # include #endif #include #include #include # include #if !defined(_KERNEL) # define KERNEL # define _KERNEL # define NOT_KERNEL #endif #ifdef NOT_KERNEL # undef _KERNEL # undef KERNEL #endif #include # if defined(__FreeBSD_version) # include # define IF_QFULL _IF_QFULL # define IF_DROP _IF_DROP # endif # include # include #include #include #include "netinet/ip_compat.h" #include #include "netinet/ip_fil.h" #include "netinet/ip_auth.h" #if !defined(MENTAT) # include # ifdef __FreeBSD__ # include # endif #endif #if defined(__FreeBSD_version) # include # if defined(_KERNEL) && !defined(IPFILTER_LKM) # include # include # endif #endif /* END OF INCLUDES */ #if !defined(lint) static const char rcsid[] = "@(#)$FreeBSD$"; /* static const char rcsid[] = "@(#)$Id: ip_auth.c,v 2.73.2.24 2007/09/09 11:32:04 darrenr Exp $"; */ #endif static void ipf_auth_deref __P((frauthent_t **)); static void ipf_auth_deref_unlocked __P((ipf_auth_softc_t *, frauthent_t **)); static int ipf_auth_geniter __P((ipf_main_softc_t *, ipftoken_t *, ipfgeniter_t *, ipfobj_t *)); static int ipf_auth_reply __P((ipf_main_softc_t *, ipf_auth_softc_t *, char *)); static int ipf_auth_wait __P((ipf_main_softc_t *, ipf_auth_softc_t *, char *)); static int ipf_auth_flush __P((void *)); /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_main_load */ /* Returns: int - 0 == success, else error */ /* Parameters: None */ /* */ /* A null-op function that exists as a placeholder so that the flow in */ /* other functions is obvious. */ /* ------------------------------------------------------------------------ */ int ipf_auth_main_load() { return 0; } /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_main_unload */ /* Returns: int - 0 == success, else error */ /* Parameters: None */ /* */ /* A null-op function that exists as a placeholder so that the flow in */ /* other functions is obvious. */ /* ------------------------------------------------------------------------ */ int ipf_auth_main_unload() { return 0; } /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_soft_create */ /* Returns: int - NULL = failure, else success */ /* Parameters: softc(I) - pointer to soft context data */ /* */ /* Create a structre to store all of the run-time data for packet auth in */ /* and initialise some fields to their defaults. */ /* ------------------------------------------------------------------------ */ void * ipf_auth_soft_create(softc) ipf_main_softc_t *softc; { ipf_auth_softc_t *softa; KMALLOC(softa, ipf_auth_softc_t *); if (softa == NULL) return NULL; bzero((char *)softa, sizeof(*softa)); softa->ipf_auth_size = FR_NUMAUTH; softa->ipf_auth_defaultage = 600; RWLOCK_INIT(&softa->ipf_authlk, "ipf IP User-Auth rwlock"); MUTEX_INIT(&softa->ipf_auth_mx, "ipf auth log mutex"); #if SOLARIS && defined(_KERNEL) cv_init(&softa->ipf_auth_wait, "ipf auth condvar", CV_DRIVER, NULL); #endif return softa; } /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_soft_init */ /* Returns: int - 0 == success, else error */ /* Parameters: softc(I) - pointer to soft context data */ /* arg(I) - opaque pointer to auth context data */ /* */ /* Allocate memory and initialise data structures used in handling auth */ /* rules. */ /* ------------------------------------------------------------------------ */ int ipf_auth_soft_init(softc, arg) ipf_main_softc_t *softc; void *arg; { ipf_auth_softc_t *softa = arg; KMALLOCS(softa->ipf_auth, frauth_t *, softa->ipf_auth_size * sizeof(*softa->ipf_auth)); if (softa->ipf_auth == NULL) return -1; bzero((char *)softa->ipf_auth, softa->ipf_auth_size * sizeof(*softa->ipf_auth)); KMALLOCS(softa->ipf_auth_pkts, mb_t **, softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts)); if (softa->ipf_auth_pkts == NULL) return -2; bzero((char *)softa->ipf_auth_pkts, softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts)); return 0; } /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_soft_fini */ /* Returns: int - 0 == success, else error */ /* Parameters: softc(I) - pointer to soft context data */ /* arg(I) - opaque pointer to auth context data */ /* */ /* Free all network buffer memory used to keep saved packets that have been */ /* connectedd to the soft soft context structure *but* do not free that: it */ /* is free'd by _destroy(). */ /* ------------------------------------------------------------------------ */ int ipf_auth_soft_fini(softc, arg) ipf_main_softc_t *softc; void *arg; { ipf_auth_softc_t *softa = arg; frauthent_t *fae, **faep; frentry_t *fr, **frp; mb_t *m; int i; if (softa->ipf_auth != NULL) { KFREES(softa->ipf_auth, softa->ipf_auth_size * sizeof(*softa->ipf_auth)); softa->ipf_auth = NULL; } if (softa->ipf_auth_pkts != NULL) { for (i = 0; i < softa->ipf_auth_size; i++) { m = softa->ipf_auth_pkts[i]; if (m != NULL) { FREE_MB_T(m); softa->ipf_auth_pkts[i] = NULL; } } KFREES(softa->ipf_auth_pkts, softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts)); softa->ipf_auth_pkts = NULL; } faep = &softa->ipf_auth_entries; while ((fae = *faep) != NULL) { *faep = fae->fae_next; KFREE(fae); } softa->ipf_auth_ip = NULL; if (softa->ipf_auth_rules != 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; } } return 0; } /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_soft_destroy */ /* Returns: void */ /* Parameters: softc(I) - pointer to soft context data */ /* arg(I) - opaque pointer to auth context data */ /* */ /* Undo what was done in _create() - i.e. free the soft context data. */ /* ------------------------------------------------------------------------ */ void ipf_auth_soft_destroy(softc, arg) ipf_main_softc_t *softc; void *arg; { ipf_auth_softc_t *softa = arg; # if SOLARIS && defined(_KERNEL) cv_destroy(&softa->ipf_auth_wait); # endif MUTEX_DESTROY(&softa->ipf_auth_mx); RW_DESTROY(&softa->ipf_authlk); KFREE(softa); } /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_setlock */ /* Returns: void */ /* Paramters: arg(I) - pointer to soft context data */ /* tmp(I) - value to assign to auth lock */ /* */ /* ------------------------------------------------------------------------ */ void ipf_auth_setlock(arg, tmp) void *arg; int tmp; { ipf_auth_softc_t *softa = arg; softa->ipf_auth_lock = tmp; } /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_check */ /* Returns: frentry_t* - pointer to ipf rule if match found, else NULL */ /* Parameters: fin(I) - pointer to ipftoken structure */ /* passp(I) - pointer to ipfgeniter structure */ /* */ /* 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 * ipf_auth_check(fin, passp) fr_info_t *fin; u_32_t *passp; { ipf_main_softc_t *softc = fin->fin_main_soft; ipf_auth_softc_t *softa = softc->ipf_auth_soft; frentry_t *fr; frauth_t *fra; u_32_t pass; u_short id; ip_t *ip; int i; if (softa->ipf_auth_lock || !softa->ipf_auth_used) return NULL; ip = fin->fin_ip; id = ip->ip_id; READ_ENTER(&softa->ipf_authlk); for (i = softa->ipf_auth_start; i != softa->ipf_auth_end; ) { /* * 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 = softa->ipf_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; fin->fin_reason = FRB_AUTHFEEDBACK; } /* * 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; MUTEX_INIT(&fr->fr_lock, "ipf auth rule"); } } else fr = fra->fra_info.fin_fr; fin->fin_fr = fr; fin->fin_flx |= fra->fra_flx; RWLOCK_EXIT(&softa->ipf_authlk); WRITE_ENTER(&softa->ipf_authlk); /* * ipf_auth_rules is populated with the rules malloc'd * above and only those. */ if ((fr != NULL) && (fr != fra->fra_info.fin_fr)) { fr->fr_next = softa->ipf_auth_rules; softa->ipf_auth_rules = fr; } softa->ipf_auth_stats.fas_hits++; fra->fra_index = -1; softa->ipf_auth_used--; softa->ipf_auth_replies--; if (i == softa->ipf_auth_start) { while (fra->fra_index == -1) { i++; fra++; if (i == softa->ipf_auth_size) { i = 0; fra = softa->ipf_auth; } 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); if (passp != NULL) *passp = pass; softa->ipf_auth_stats.fas_hits++; return fr; } i++; if (i == softa->ipf_auth_size) i = 0; } RWLOCK_EXIT(&softa->ipf_authlk); softa->ipf_auth_stats.fas_miss++; return NULL; } /* ------------------------------------------------------------------------ */ /* Function: ipf_auth_new */ /* Returns: int - 1 == success, 0 = did not put packet on auth queue */ /* Parameters: m(I) - pointer to mb_t with packet in it */ /* fin(I) - pointer to packet information */ /* */ /* 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 ipf_auth_new(m, fin) mb_t *m; fr_info_t *fin; { ipf_main_softc_t *softc = fin->fin_main_soft; ipf_auth_softc_t *softa = softc->ipf_auth_soft; #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 (softa->ipf_auth_lock) return 0; WRITE_ENTER(&softa->ipf_authlk); if (((softa->ipf_auth_end + 1) % softa->ipf_auth_size) == softa->ipf_auth_start) { softa->ipf_auth_stats.fas_nospace++; RWLOCK_EXIT(&softa->ipf_authlk); return 0; } softa->ipf_auth_stats.fas_added++; softa->ipf_auth_used++; i = softa->ipf_auth_end++; if (softa->ipf_auth_end == softa->ipf_auth_size) softa->ipf_auth_end = 0; fra = softa->ipf_auth + i; fra->fra_index = i; if (fin->fin_fr != NULL) fra->fra_pass = fin->fin_fr->fr_flags; else fra->fra_pass = 0; fra->fra_age = softa->ipf_auth_defaultage; bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin)); fra->fra_flx = fra->fra_info.fin_flx & (FI_STATE|FI_NATED); 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 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) 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(softc, data, cmd, mode, uid, ctx) ipf_main_softc_t *softc; caddr_t data; ioctlcmd_t cmd; int mode, 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(softc) 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(softc, cmd, fr, frptr) ipf_main_softc_t *softc; ioctlcmd_t cmd; frentry_t *fr, **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(arg) 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(softc) 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(softc, token, itp, objp) 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(softa, faep) 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(faep) 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(softc, softa, data) 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(softc, softa, data) 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(softc, fin, pass) 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(softc) ipf_main_softc_t *softc; { ipf_auth_softc_t *softa = softc->ipf_auth_soft; return &softa->ipf_auth_ip; }