Ejemplo n.º 1
0
static void
nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
{
	struct nfsrv_descript nd;
	struct nfsrvcache *rp = NULL;
	int cacherep, credflavor;

	memset(&nd, 0, sizeof(nd));
	if (rqst->rq_vers == NFS_VER2) {
		if (rqst->rq_proc > NFSV2PROC_STATFS) {
			svcerr_noproc(rqst);
			svc_freereq(rqst);
			goto out;
		}
		nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
		nd.nd_flag = ND_NFSV2;
	} else if (rqst->rq_vers == NFS_VER3) {
		if (rqst->rq_proc >= NFS_V3NPROCS) {
			svcerr_noproc(rqst);
			svc_freereq(rqst);
			goto out;
		}
		nd.nd_procnum = rqst->rq_proc;
		nd.nd_flag = ND_NFSV3;
	} else {
		if (rqst->rq_proc != NFSPROC_NULL &&
		    rqst->rq_proc != NFSV4PROC_COMPOUND) {
			svcerr_noproc(rqst);
			svc_freereq(rqst);
			goto out;
		}
		nd.nd_procnum = rqst->rq_proc;
		nd.nd_flag = ND_NFSV4;
	}

	/*
	 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
	 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
	 * mounts.
	 */
	nd.nd_mrep = rqst->rq_args;
	rqst->rq_args = NULL;
	newnfs_realign(&nd.nd_mrep, M_WAITOK);
	nd.nd_md = nd.nd_mrep;
	nd.nd_dpos = mtod(nd.nd_md, caddr_t);
	nd.nd_nam = svc_getrpccaller(rqst);
	nd.nd_nam2 = rqst->rq_addr;
	nd.nd_mreq = NULL;
	nd.nd_cred = NULL;

	if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
		/* Check if source port is privileged */
		u_short port;
		struct sockaddr *nam = nd.nd_nam;
		struct sockaddr_in *sin;

		sin = (struct sockaddr_in *)nam;
		/*
		 * INET/INET6 - same code:
		 *    sin_port and sin6_port are at same offset
		 */
		port = ntohs(sin->sin_port);
		if (port >= IPPORT_RESERVED &&
		    nd.nd_procnum != NFSPROC_NULL) {
#ifdef INET6
			char b6[INET6_ADDRSTRLEN];
#if defined(KLD_MODULE)
			/* Do not use ip6_sprintf: the nfs module should work without INET6. */
#define	ip6_sprintf(buf, a)						\
			(sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x",	\
			    (a)->s6_addr16[0], (a)->s6_addr16[1],	\
			    (a)->s6_addr16[2], (a)->s6_addr16[3],	\
			    (a)->s6_addr16[4], (a)->s6_addr16[5],	\
			    (a)->s6_addr16[6], (a)->s6_addr16[7]),	\
			    (buf))
#endif
#endif
			printf("NFS request from unprivileged port (%s:%d)\n",
#ifdef INET6
			    sin->sin_family == AF_INET6 ?
			    ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
#if defined(KLD_MODULE)
#undef ip6_sprintf
#endif
#endif
			    inet_ntoa(sin->sin_addr), port);
			svcerr_weakauth(rqst);
			svc_freereq(rqst);
			m_freem(nd.nd_mrep);
			goto out;
		}
	}

	if (nd.nd_procnum != NFSPROC_NULL) {
		if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
			svcerr_weakauth(rqst);
			svc_freereq(rqst);
			m_freem(nd.nd_mrep);
			goto out;
		}

		/* Set the flag based on credflavor */
		if (credflavor == RPCSEC_GSS_KRB5) {
			nd.nd_flag |= ND_GSS;
		} else if (credflavor == RPCSEC_GSS_KRB5I) {
			nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
		} else if (credflavor == RPCSEC_GSS_KRB5P) {
			nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
		} else if (credflavor != AUTH_SYS) {
			svcerr_weakauth(rqst);
			svc_freereq(rqst);
			m_freem(nd.nd_mrep);
			goto out;
		}

#ifdef MAC
		mac_cred_associate_nfsd(nd.nd_cred);
#endif
		/*
		 * Get a refcnt (shared lock) on nfsd_suspend_lock.
		 * NFSSVC_SUSPENDNFSD will take an exclusive lock on
		 * nfsd_suspend_lock to suspend these threads.
		 * This must be done here, before the check of
		 * nfsv4root exports by nfsvno_v4rootexport().
		 */
		NFSLOCKV4ROOTMUTEX();
		nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR,
		    NULL);
		NFSUNLOCKV4ROOTMUTEX();

		if ((nd.nd_flag & ND_NFSV4) != 0) {
			nd.nd_repstat = nfsvno_v4rootexport(&nd);
			if (nd.nd_repstat != 0) {
				NFSLOCKV4ROOTMUTEX();
				nfsv4_relref(&nfsd_suspend_lock);
				NFSUNLOCKV4ROOTMUTEX();
				svcerr_weakauth(rqst);
				svc_freereq(rqst);
				m_freem(nd.nd_mrep);
				goto out;
			}
		}

		cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp);
		NFSLOCKV4ROOTMUTEX();
		nfsv4_relref(&nfsd_suspend_lock);
		NFSUNLOCKV4ROOTMUTEX();
	} else {
		NFSMGET(nd.nd_mreq);
		nd.nd_mreq->m_len = 0;
		cacherep = RC_REPLY;
	}
	if (nd.nd_mrep != NULL)
		m_freem(nd.nd_mrep);

	if (nd.nd_cred != NULL)
		crfree(nd.nd_cred);

	if (cacherep == RC_DROPIT) {
		if (nd.nd_mreq != NULL)
			m_freem(nd.nd_mreq);
		svc_freereq(rqst);
		goto out;
	}

	if (nd.nd_mreq == NULL) {
		svcerr_decode(rqst);
		svc_freereq(rqst);
		goto out;
	}

	if (nd.nd_repstat & NFSERR_AUTHERR) {
		svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
		if (nd.nd_mreq != NULL)
			m_freem(nd.nd_mreq);
	} else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
		svcerr_systemerr(rqst);
	}
	if (rp != NULL) {
		nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 ||
		    SVC_ACK(xprt, NULL)), rqst->rq_reply_seq);
	}
	svc_freereq(rqst);

out:
	NFSEXITCODE(0);
}
Ejemplo n.º 2
0
/*
 * Handles server to client callbacks.
 */
static void
nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
{
	struct nfsrv_descript nd;
	int cacherep, credflavor;

	memset(&nd, 0, sizeof(nd));
	if (rqst->rq_proc != NFSPROC_NULL &&
	    rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
		svcerr_noproc(rqst);
		svc_freereq(rqst);
		return;
	}
	nd.nd_procnum = rqst->rq_proc;
	nd.nd_flag = (ND_NFSCB | ND_NFSV4);

	/*
	 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
	 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
	 * mounts.
	 */
	nd.nd_mrep = rqst->rq_args;
	rqst->rq_args = NULL;
	newnfs_realign(&nd.nd_mrep, M_WAITOK);
	nd.nd_md = nd.nd_mrep;
	nd.nd_dpos = mtod(nd.nd_md, caddr_t);
	nd.nd_nam = svc_getrpccaller(rqst);
	nd.nd_nam2 = rqst->rq_addr;
	nd.nd_mreq = NULL;
	nd.nd_cred = NULL;

	NFSCL_DEBUG(1, "cbproc=%d\n",nd.nd_procnum);
	if (nd.nd_procnum != NFSPROC_NULL) {
		if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
			svcerr_weakauth(rqst);
			svc_freereq(rqst);
			m_freem(nd.nd_mrep);
			return;
		}

		/* For now, I don't care what credential flavor was used. */
#ifdef notyet
#ifdef MAC
		mac_cred_associate_nfsd(nd.nd_cred);
#endif
#endif
		cacherep = nfs_cbproc(&nd, rqst->rq_xid);
	} else {
		NFSMGET(nd.nd_mreq);
		nd.nd_mreq->m_len = 0;
		cacherep = RC_REPLY;
	}
	if (nd.nd_mrep != NULL)
		m_freem(nd.nd_mrep);

	if (nd.nd_cred != NULL)
		crfree(nd.nd_cred);

	if (cacherep == RC_DROPIT) {
		if (nd.nd_mreq != NULL)
			m_freem(nd.nd_mreq);
		svc_freereq(rqst);
		return;
	}

	if (nd.nd_mreq == NULL) {
		svcerr_decode(rqst);
		svc_freereq(rqst);
		return;
	}

	if (nd.nd_repstat & NFSERR_AUTHERR) {
		svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
		if (nd.nd_mreq != NULL)
			m_freem(nd.nd_mreq);
	} else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq))
		svcerr_systemerr(rqst);
	else
		NFSCL_DEBUG(1, "cbrep sent\n");
	svc_freereq(rqst);
}