1 /* $NetBSD: nfs_clkrpc.c,v 1.2 2016/12/13 22:17:33 pgoyette Exp $ */ 2 /*- 3 * Copyright (c) 1989, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Rick Macklem at The University of Guelph. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 */ 34 35 #include <sys/cdefs.h> 36 /* __FBSDID("FreeBSD: head/sys/fs/nfsclient/nfs_clkrpc.c 255216 2013-09-04 22:47:56Z rmacklem "); */ 37 __RCSID("$NetBSD: nfs_clkrpc.c,v 1.2 2016/12/13 22:17:33 pgoyette Exp $"); 38 39 #ifdef NOTYET /* _KERNEL_OPT */ 40 #include "opt_kgssapi.h" 41 #endif 42 43 #include <fs/nfs/common/nfsport.h> 44 45 #include <rpc/rpc.h> 46 #include <rpc/rpcsec_gss.h> 47 #include <rpc/replay.h> 48 49 50 NFSDLOCKMUTEX; 51 52 extern SVCPOOL *nfscbd_pool; 53 54 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t); 55 56 extern u_long sb_max_adj; 57 extern int nfs_numnfscbd; 58 extern int nfscl_debuglevel; 59 60 /* 61 * NFS client system calls for handling callbacks. 62 */ 63 64 /* 65 * Handles server to client callbacks. 66 */ 67 static void 68 nfscb_program(struct svc_req *rqst, SVCXPRT *xprt) 69 { 70 struct nfsrv_descript nd; 71 int cacherep, credflavor; 72 73 memset(&nd, 0, sizeof(nd)); 74 if (rqst->rq_proc != NFSPROC_NULL && 75 rqst->rq_proc != NFSV4PROC_CBCOMPOUND) { 76 svcerr_noproc(rqst); 77 svc_freereq(rqst); 78 return; 79 } 80 nd.nd_procnum = rqst->rq_proc; 81 nd.nd_flag = (ND_NFSCB | ND_NFSV4); 82 83 /* 84 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 - 85 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP 86 * mounts. 87 */ 88 nd.nd_mrep = rqst->rq_args; 89 rqst->rq_args = NULL; 90 newnfs_realign(&nd.nd_mrep, M_WAITOK); 91 nd.nd_md = nd.nd_mrep; 92 nd.nd_dpos = mtod(nd.nd_md, caddr_t); 93 nd.nd_nam = svc_getrpccaller(rqst); 94 nd.nd_nam2 = rqst->rq_addr; 95 nd.nd_mreq = NULL; 96 nd.nd_cred = NULL; 97 98 NFSCL_DEBUG(1, "cbproc=%d\n",nd.nd_procnum); 99 if (nd.nd_procnum != NFSPROC_NULL) { 100 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) { 101 svcerr_weakauth(rqst); 102 svc_freereq(rqst); 103 m_freem(nd.nd_mrep); 104 return; 105 } 106 107 /* For now, I don't care what credential flavor was used. */ 108 #ifdef notyet 109 #ifdef MAC 110 mac_cred_associate_nfsd(nd.nd_cred); 111 #endif 112 #endif 113 cacherep = nfs_cbproc(&nd, rqst->rq_xid); 114 } else { 115 NFSMGET(nd.nd_mreq); 116 nd.nd_mreq->m_len = 0; 117 cacherep = RC_REPLY; 118 } 119 if (nd.nd_mrep != NULL) 120 m_freem(nd.nd_mrep); 121 122 if (nd.nd_cred != NULL) 123 crfree(nd.nd_cred); 124 125 if (cacherep == RC_DROPIT) { 126 if (nd.nd_mreq != NULL) 127 m_freem(nd.nd_mreq); 128 svc_freereq(rqst); 129 return; 130 } 131 132 if (nd.nd_mreq == NULL) { 133 svcerr_decode(rqst); 134 svc_freereq(rqst); 135 return; 136 } 137 138 if (nd.nd_repstat & NFSERR_AUTHERR) { 139 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR); 140 if (nd.nd_mreq != NULL) 141 m_freem(nd.nd_mreq); 142 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) 143 svcerr_systemerr(rqst); 144 else 145 NFSCL_DEBUG(1, "cbrep sent\n"); 146 svc_freereq(rqst); 147 } 148 149 /* 150 * Check the cache and, optionally, do the RPC. 151 * Return the appropriate cache response. 152 */ 153 static int 154 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid) 155 { 156 struct thread *td = curthread; 157 int cacherep; 158 159 if (nd->nd_nam2 == NULL) 160 nd->nd_flag |= ND_STREAMSOCK; 161 162 nfscl_docb(nd, td); 163 if (nd->nd_repstat == NFSERR_DONTREPLY) 164 cacherep = RC_DROPIT; 165 else 166 cacherep = RC_REPLY; 167 return (cacherep); 168 } 169 170 /* 171 * Adds a socket to the list for servicing by nfscbds. 172 */ 173 int 174 nfscbd_addsock(struct file *fp) 175 { 176 int siz; 177 struct socket *so; 178 int error; 179 SVCXPRT *xprt; 180 181 so = fp->f_data; 182 183 siz = sb_max_adj; 184 error = soreserve(so, siz, siz); 185 if (error) 186 return (error); 187 188 /* 189 * Steal the socket from userland so that it doesn't close 190 * unexpectedly. 191 */ 192 if (so->so_type == SOCK_DGRAM) 193 xprt = svc_dg_create(nfscbd_pool, so, 0, 0); 194 else 195 xprt = svc_vc_create(nfscbd_pool, so, 0, 0); 196 if (xprt) { 197 fp->f_ops = &badfileops; 198 fp->f_data = NULL; 199 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program, 200 NULL); 201 SVC_RELEASE(xprt); 202 } 203 204 return (0); 205 } 206 207 /* 208 * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests 209 * until it is killed by a signal. 210 * 211 * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV 212 * keytab entry with a host based entry in it on the client. (I'm not even 213 * sure that getting Acceptor credentials for a user principal with a 214 * credentials cache is possible, but even if it is, major changes to the 215 * kgssapi would be required.) 216 * I don't believe that this is a serious limitation since, as of 2009, most 217 * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even 218 * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS 219 * for callbacks unless nfsrv_gsscallbackson is set non-zero.) 220 */ 221 int 222 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args) 223 { 224 char principal[128]; 225 int error; 226 227 if (args != NULL) { 228 error = copyinstr(args->principal, principal, 229 sizeof(principal), NULL); 230 if (error) 231 return (error); 232 } else { 233 principal[0] = '\0'; 234 } 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 if (principal[0] != '\0') 250 rpc_gss_set_svc_name_call(principal, "kerberosv5", 251 GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS); 252 253 nfscbd_pool->sp_minthreads = 4; 254 nfscbd_pool->sp_maxthreads = 4; 255 256 svc_run(nfscbd_pool); 257 258 rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS); 259 260 NFSD_LOCK(); 261 nfs_numnfscbd--; 262 nfsrvd_cbinit(1); 263 } 264 NFSD_UNLOCK(); 265 266 return (0); 267 } 268 269 /* 270 * Initialize the data structures for the server. 271 * Handshake with any new nfsds starting up to avoid any chance of 272 * corruption. 273 */ 274 void 275 nfsrvd_cbinit(int terminating) 276 { 277 278 NFSD_LOCK_ASSERT(); 279 280 if (terminating) { 281 /* Wait for any xprt registrations to complete. */ 282 while (nfs_numnfscbd > 0) 283 msleep(&nfs_numnfscbd, NFSDLOCKMUTEXPTR, PZERO, 284 "nfscbdt", 0); 285 } 286 287 if (nfscbd_pool == NULL) { 288 NFSD_UNLOCK(); 289 nfscbd_pool = svcpool_create("nfscbd", NULL); 290 nfscbd_pool->sp_rcache = NULL; 291 nfscbd_pool->sp_assign = NULL; 292 nfscbd_pool->sp_done = NULL; 293 NFSD_LOCK(); 294 } 295 } 296 297