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("$FreeBSD$"); 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 } 290 291