2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_kgssapi.h"
39 #include <fs/nfs/nfsport.h>
42 #include <rpc/rpcsec_gss.h>
43 #include <rpc/replay.h>
48 extern SVCPOOL *nfscbd_pool;
50 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
52 extern u_long sb_max_adj;
53 extern int nfs_numnfscbd;
54 extern int nfscl_debuglevel;
57 * NFS client system calls for handling callbacks.
61 * Handles server to client callbacks.
64 nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
66 struct nfsrv_descript nd;
67 int cacherep, credflavor;
69 memset(&nd, 0, sizeof(nd));
70 if (rqst->rq_proc != NFSPROC_NULL &&
71 rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
76 nd.nd_procnum = rqst->rq_proc;
77 nd.nd_flag = (ND_NFSCB | ND_NFSV4);
80 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
81 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
84 nd.nd_mrep = rqst->rq_args;
86 newnfs_realign(&nd.nd_mrep, M_WAITOK);
87 nd.nd_md = nd.nd_mrep;
88 nd.nd_dpos = mtod(nd.nd_md, caddr_t);
89 nd.nd_nam = svc_getrpccaller(rqst);
90 nd.nd_nam2 = rqst->rq_addr;
94 NFSCL_DEBUG(1, "cbproc=%d\n",nd.nd_procnum);
95 if (nd.nd_procnum != NFSPROC_NULL) {
96 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
97 svcerr_weakauth(rqst);
103 /* For now, I don't care what credential flavor was used. */
106 mac_cred_associate_nfsd(nd.nd_cred);
109 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
112 nd.nd_mreq->m_len = 0;
115 if (nd.nd_mrep != NULL)
118 if (nd.nd_cred != NULL)
121 if (cacherep == RC_DROPIT) {
122 if (nd.nd_mreq != NULL)
128 if (nd.nd_mreq == NULL) {
134 if (nd.nd_repstat & NFSERR_AUTHERR) {
135 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
136 if (nd.nd_mreq != NULL)
138 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq))
139 svcerr_systemerr(rqst);
141 NFSCL_DEBUG(1, "cbrep sent\n");
146 * Check the cache and, optionally, do the RPC.
147 * Return the appropriate cache response.
150 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
152 struct thread *td = curthread;
155 if (nd->nd_nam2 == NULL)
156 nd->nd_flag |= ND_STREAMSOCK;
159 if (nd->nd_repstat == NFSERR_DONTREPLY)
160 cacherep = RC_DROPIT;
167 * Adds a socket to the list for servicing by nfscbds.
170 nfscbd_addsock(struct file *fp)
180 error = soreserve(so, siz, siz);
185 * Steal the socket from userland so that it doesn't close
188 if (so->so_type == SOCK_DGRAM)
189 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
191 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
193 fp->f_ops = &badfileops;
195 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
204 * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
205 * until it is killed by a signal.
207 * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
208 * keytab entry with a host based entry in it on the client. (I'm not even
209 * sure that getting Acceptor credentials for a user principal with a
210 * credentials cache is possible, but even if it is, major changes to the
211 * kgssapi would be required.)
212 * I don't believe that this is a serious limitation since, as of 2009, most
213 * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
214 * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
215 * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
218 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
224 error = copyinstr(args->principal, principal,
225 sizeof(principal), NULL);
233 * Only the first nfsd actually does any work. The RPC code
234 * adds threads to it as needed. Any extra processes offered
235 * by nfsd just exit. If nfsd is new enough, it will call us
236 * once with a structure that specifies how many threads to
240 if (nfs_numnfscbd == 0) {
245 if (principal[0] != '\0')
246 rpc_gss_set_svc_name_call(principal, "kerberosv5",
247 GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
249 nfscbd_pool->sp_minthreads = 4;
250 nfscbd_pool->sp_maxthreads = 4;
252 svc_run(nfscbd_pool);
254 rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
266 * Initialize the data structures for the server.
267 * Handshake with any new nfsds starting up to avoid any chance of
271 nfsrvd_cbinit(int terminating)
277 /* Wait for any xprt registrations to complete. */
278 while (nfs_numnfscbd > 0)
279 msleep(&nfs_numnfscbd, NFSDLOCKMUTEXPTR, PZERO,
281 if (nfscbd_pool != NULL) {
283 svcpool_close(nfscbd_pool);
288 if (nfscbd_pool == NULL) {
290 nfscbd_pool = svcpool_create("nfscbd", NULL);
291 nfscbd_pool->sp_rcache = NULL;
292 nfscbd_pool->sp_assign = NULL;
293 nfscbd_pool->sp_done = NULL;