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/9.0/sys/fs/nfsclient/nfs_clkrpc.c 223309 2011-06-19 22:08:55Z 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 SVCPOOL *nfscbd_pool;
50
51 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
52
53 extern u_long sb_max_adj;
54 extern int nfs_numnfscbd;
55
56 /*
57 * NFS client system calls for handling callbacks.
58 */
59
60 /*
61 * Handles server to client callbacks.
62 */
63 static void
64 nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
65 {
66 struct nfsrv_descript nd;
67 int cacherep, credflavor;
68
69 memset(&nd, 0, sizeof(nd));
70 if (rqst->rq_proc != NFSPROC_NULL &&
71 rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
72 svcerr_noproc(rqst);
73 svc_freereq(rqst);
74 return;
75 }
76 nd.nd_procnum = rqst->rq_proc;
77 nd.nd_flag = (ND_NFSCB | ND_NFSV4);
78
79 /*
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
82 * mounts.
83 */
84 nd.nd_mrep = rqst->rq_args;
85 rqst->rq_args = NULL;
86 newnfs_realign(&nd.nd_mrep);
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;
91 nd.nd_mreq = NULL;
92 nd.nd_cred = NULL;
93
94 if (nd.nd_procnum != NFSPROC_NULL) {
95 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
96 svcerr_weakauth(rqst);
97 svc_freereq(rqst);
98 m_freem(nd.nd_mrep);
99 return;
100 }
101
102 /* For now, I don't care what credential flavor was used. */
103 #ifdef notyet
104 #ifdef MAC
105 mac_cred_associate_nfsd(nd.nd_cred);
106 #endif
107 #endif
108 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
109 } else {
110 NFSMGET(nd.nd_mreq);
111 nd.nd_mreq->m_len = 0;
112 cacherep = RC_REPLY;
113 }
114 if (nd.nd_mrep != NULL)
115 m_freem(nd.nd_mrep);
116
117 if (nd.nd_cred != NULL)
118 crfree(nd.nd_cred);
119
120 if (cacherep == RC_DROPIT) {
121 if (nd.nd_mreq != NULL)
122 m_freem(nd.nd_mreq);
123 svc_freereq(rqst);
124 return;
125 }
126
127 if (nd.nd_mreq == NULL) {
128 svcerr_decode(rqst);
129 svc_freereq(rqst);
130 return;
131 }
132
133 if (nd.nd_repstat & NFSERR_AUTHERR) {
134 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
135 if (nd.nd_mreq != NULL)
136 m_freem(nd.nd_mreq);
137 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
138 svcerr_systemerr(rqst);
139 }
140 svc_freereq(rqst);
141 }
142
143 /*
144 * Check the cache and, optionally, do the RPC.
145 * Return the appropriate cache response.
146 */
147 static int
148 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
149 {
150 struct thread *td = curthread;
151 int cacherep;
152
153 if (nd->nd_nam2 == NULL)
154 nd->nd_flag |= ND_STREAMSOCK;
155
156 nfscl_docb(nd, td);
157 if (nd->nd_repstat == NFSERR_DONTREPLY)
158 cacherep = RC_DROPIT;
159 else
160 cacherep = RC_REPLY;
161 return (cacherep);
162 }
163
164 /*
165 * Adds a socket to the list for servicing by nfscbds.
166 */
167 int
168 nfscbd_addsock(struct file *fp)
169 {
170 int siz;
171 struct socket *so;
172 int error;
173 SVCXPRT *xprt;
174
175 so = fp->f_data;
176
177 siz = sb_max_adj;
178 error = soreserve(so, siz, siz);
179 if (error)
180 return (error);
181
182 /*
183 * Steal the socket from userland so that it doesn't close
184 * unexpectedly.
185 */
186 if (so->so_type == SOCK_DGRAM)
187 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
188 else
189 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
190 if (xprt) {
191 fp->f_ops = &badfileops;
192 fp->f_data = NULL;
193 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
194 NULL);
195 SVC_RELEASE(xprt);
196 }
197
198 return (0);
199 }
200
201 /*
202 * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
203 * until it is killed by a signal.
204 *
205 * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
206 * keytab entry with a host based entry in it on the client. (I'm not even
207 * sure that getting Acceptor credentials for a user principal with a
208 * credentials cache is possible, but even if it is, major changes to the
209 * kgssapi would be required.)
210 * I don't believe that this is a serious limitation since, as of 2009, most
211 * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
212 * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
213 * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
214 */
215 int
216 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
217 {
218 char principal[128];
219 int error;
220
221 if (args != NULL) {
222 error = copyinstr(args->principal, principal,
223 sizeof(principal), NULL);
224 if (error)
225 return (error);
226 } else {
227 principal[0] = '\0';
228 }
229
230 /*
231 * Only the first nfsd actually does any work. The RPC code
232 * adds threads to it as needed. Any extra processes offered
233 * by nfsd just exit. If nfsd is new enough, it will call us
234 * once with a structure that specifies how many threads to
235 * use.
236 */
237 NFSD_LOCK();
238 if (nfs_numnfscbd == 0) {
239 nfs_numnfscbd++;
240
241 NFSD_UNLOCK();
242
243 if (principal[0] != '\0')
244 rpc_gss_set_svc_name_call(principal, "kerberosv5",
245 GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
246
247 nfscbd_pool->sp_minthreads = 4;
248 nfscbd_pool->sp_maxthreads = 4;
249
250 svc_run(nfscbd_pool);
251
252 rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
253
254 NFSD_LOCK();
255 nfs_numnfscbd--;
256 nfsrvd_cbinit(1);
257 }
258 NFSD_UNLOCK();
259
260 return (0);
261 }
262
263 /*
264 * Initialize the data structures for the server.
265 * Handshake with any new nfsds starting up to avoid any chance of
266 * corruption.
267 */
268 void
269 nfsrvd_cbinit(int terminating)
270 {
271
272 NFSD_LOCK_ASSERT();
273
274 if (terminating) {
275 NFSD_UNLOCK();
276 svcpool_destroy(nfscbd_pool);
277 nfscbd_pool = NULL;
278 NFSD_LOCK();
279 }
280
281 NFSD_UNLOCK();
282
283 nfscbd_pool = svcpool_create("nfscbd", NULL);
284 nfscbd_pool->sp_rcache = NULL;
285 nfscbd_pool->sp_assign = NULL;
286 nfscbd_pool->sp_done = NULL;
287
288 NFSD_LOCK();
289 }
290
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