1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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 * 4. 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.
19 *
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
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/8.0/sys/fs/nfsclient/nfs_clkrpc.c 194408 2009-06-17 22:55:59Z rmacklem $");
36
37 #include "opt_inet6.h"
38 #include "opt_kgssapi.h"
39
40 #include <fs/nfs/nfsport.h>
41
42 #include <rpc/rpc.h>
43 #include <rpc/rpcsec_gss.h>
44 #include <rpc/replay.h>
45
46
47 NFSDLOCKMUTEX;
48
49 SYSCTL_DECL(_vfs_newnfs);
50
51 SVCPOOL *nfscbd_pool;
52
53 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
54
55 extern u_long sb_max_adj;
56 extern int nfs_numnfscbd;
57
58 /*
59 * NFS client system calls for handling callbacks.
60 */
61
62 /*
63 * Handles server to client callbacks.
64 */
65 static void
66 nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
67 {
68 struct nfsrv_descript nd;
69 int cacherep, credflavor;
70
71 memset(&nd, 0, sizeof(nd));
72 if (rqst->rq_proc != NFSPROC_NULL &&
73 rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
74 svcerr_noproc(rqst);
75 svc_freereq(rqst);
76 return;
77 }
78 nd.nd_procnum = rqst->rq_proc;
79 nd.nd_flag = (ND_NFSCB | ND_NFSV4);
80
81 /*
82 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
83 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
84 * mounts.
85 */
86 nd.nd_mrep = rqst->rq_args;
87 rqst->rq_args = NULL;
88 newnfs_realign(&nd.nd_mrep);
89 nd.nd_md = nd.nd_mrep;
90 nd.nd_dpos = mtod(nd.nd_md, caddr_t);
91 nd.nd_nam = svc_getrpccaller(rqst);
92 nd.nd_nam2 = rqst->rq_addr;
93 nd.nd_mreq = NULL;
94 nd.nd_cred = NULL;
95
96 if (nd.nd_procnum != NFSPROC_NULL) {
97 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
98 svcerr_weakauth(rqst);
99 svc_freereq(rqst);
100 m_freem(nd.nd_mrep);
101 return;
102 }
103
104 /* For now, I don't care what credential flavor was used. */
105 #ifdef notyet
106 #ifdef MAC
107 mac_cred_associate_nfsd(nd.nd_cred);
108 #endif
109 #endif
110 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
111 } else {
112 NFSMGET(nd.nd_mreq);
113 nd.nd_mreq->m_len = 0;
114 cacherep = RC_REPLY;
115 }
116 if (nd.nd_mrep != NULL)
117 m_freem(nd.nd_mrep);
118
119 if (nd.nd_cred != NULL)
120 crfree(nd.nd_cred);
121
122 if (cacherep == RC_DROPIT) {
123 if (nd.nd_mreq != NULL)
124 m_freem(nd.nd_mreq);
125 svc_freereq(rqst);
126 return;
127 }
128
129 if (nd.nd_mreq == NULL) {
130 svcerr_decode(rqst);
131 svc_freereq(rqst);
132 return;
133 }
134
135 if (nd.nd_repstat & NFSERR_AUTHERR) {
136 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
137 if (nd.nd_mreq != NULL)
138 m_freem(nd.nd_mreq);
139 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
140 svcerr_systemerr(rqst);
141 }
142 svc_freereq(rqst);
143 }
144
145 /*
146 * Check the cache and, optionally, do the RPC.
147 * Return the appropriate cache response.
148 */
149 static int
150 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
151 {
152 struct thread *td = curthread;
153 int cacherep;
154
155 if (nd->nd_nam2 == NULL)
156 nd->nd_flag |= ND_STREAMSOCK;
157
158 nfscl_docb(nd, td);
159 if (nd->nd_repstat == NFSERR_DONTREPLY)
160 cacherep = RC_DROPIT;
161 else
162 cacherep = RC_REPLY;
163 return (cacherep);
164 }
165
166 /*
167 * Adds a socket to the list for servicing by nfscbds.
168 */
169 int
170 nfscbd_addsock(struct file *fp)
171 {
172 int siz;
173 struct socket *so;
174 int error;
175 SVCXPRT *xprt;
176
177 so = fp->f_data;
178
179 siz = sb_max_adj;
180 error = soreserve(so, siz, siz);
181 if (error)
182 return (error);
183
184 /*
185 * Steal the socket from userland so that it doesn't close
186 * unexpectedly.
187 */
188 if (so->so_type == SOCK_DGRAM)
189 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
190 else
191 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
192 if (xprt) {
193 fp->f_ops = &badfileops;
194 fp->f_data = NULL;
195 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
196 NULL);
197 SVC_RELEASE(xprt);
198 }
199
200 return (0);
201 }
202
203 /*
204 * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
205 * until it is killed by a signal.
206 *
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.)
216 */
217 int
218 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
219 {
220 #ifdef KGSSAPI
221 char principal[128];
222 int error;
223 #endif
224
225 #ifdef KGSSAPI
226 if (args != NULL) {
227 error = copyinstr(args->principal, principal,
228 sizeof(principal), NULL);
229 if (error)
230 return (error);
231 } else {
232 principal[0] = '\0';
233 }
234 #endif
235
236 /*
237 * Only the first nfsd actually does any work. The RPC code
238 * adds threads to it as needed. Any extra processes offered
239 * by nfsd just exit. If nfsd is new enough, it will call us
240 * once with a structure that specifies how many threads to
241 * use.
242 */
243 NFSD_LOCK();
244 if (nfs_numnfscbd == 0) {
245 nfs_numnfscbd++;
246
247 NFSD_UNLOCK();
248
249 #ifdef KGSSAPI
250 if (principal[0] != '\0')
251 rpc_gss_set_svc_name(principal, "kerberosv5",
252 GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
253 #endif
254
255 nfscbd_pool->sp_minthreads = 4;
256 nfscbd_pool->sp_maxthreads = 4;
257
258 svc_run(nfscbd_pool);
259
260 #ifdef KGSSAPI
261 rpc_gss_clear_svc_name(NFS_CALLBCKPROG, NFSV4_CBVERS);
262 #endif
263
264 NFSD_LOCK();
265 nfs_numnfscbd--;
266 nfsrvd_cbinit(1);
267 }
268 NFSD_UNLOCK();
269
270 return (0);
271 }
272
273 /*
274 * Initialize the data structures for the server.
275 * Handshake with any new nfsds starting up to avoid any chance of
276 * corruption.
277 */
278 void
279 nfsrvd_cbinit(int terminating)
280 {
281
282 NFSD_LOCK_ASSERT();
283
284 if (terminating) {
285 NFSD_UNLOCK();
286 svcpool_destroy(nfscbd_pool);
287 nfscbd_pool = NULL;
288 NFSD_LOCK();
289 }
290
291 NFSD_UNLOCK();
292
293 nfscbd_pool = svcpool_create("nfscbd", NULL);
294 nfscbd_pool->sp_rcache = NULL;
295 nfscbd_pool->sp_assign = NULL;
296 nfscbd_pool->sp_done = NULL;
297
298 NFSD_LOCK();
299 }
300
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