1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/fm/util.h> 31 32 #include <netdir.h> 33 #include <strings.h> 34 #include <alloca.h> 35 #include <limits.h> 36 #include <unistd.h> 37 #include <ucred.h> 38 #include <priv.h> 39 40 #include <fmd_rpc_api.h> 41 #include <fmd_rpc_adm.h> 42 #include <rpc/svc_mt.h> 43 44 #include <fmd_subr.h> 45 #include <fmd_error.h> 46 #include <fmd_thread.h> 47 #include <fmd_conf.h> 48 #include <fmd_api.h> 49 #include <fmd.h> 50 51 /* 52 * Define range of transient RPC program numbers to use for transient bindings. 53 * These are defined in the Solaris ONC+ Developer's Guide, Appendix B, but 54 * are cleverly not defined in any ONC+ standard system header file. 55 */ 56 #define RPC_TRANS_MIN 0x40000000 57 #define RPC_TRANS_MAX 0x5fffffff 58 59 /* 60 * We use our own private version of svc_create() which registers our services 61 * only on loopback transports and enables an option whereby Solaris ucreds 62 * are associated with each connection, permitting us to check privilege bits. 63 */ 64 static int 65 fmd_rpc_svc_create_local(void (*disp)(struct svc_req *, SVCXPRT *), 66 rpcprog_t prog, rpcvers_t vers, uint_t ssz, uint_t rsz, int force) 67 { 68 struct netconfig *ncp; 69 struct netbuf buf; 70 SVCXPRT *xprt; 71 void *hdl; 72 int fd, n = 0; 73 74 char door[PATH_MAX]; 75 time_t tm; 76 77 if ((hdl = setnetconfig()) == NULL) { 78 fmd_error(EFMD_RPC_REG, "failed to iterate over " 79 "netconfig database: %s\n", nc_sperror()); 80 return (fmd_set_errno(EFMD_RPC_REG)); 81 } 82 83 if (force) 84 svc_unreg(prog, vers); /* clear stale rpcbind registrations */ 85 86 buf.buf = alloca(_SS_MAXSIZE); 87 buf.maxlen = _SS_MAXSIZE; 88 buf.len = 0; 89 90 while ((ncp = getnetconfig(hdl)) != NULL) { 91 if (strcmp(ncp->nc_protofmly, NC_LOOPBACK) != 0) 92 continue; 93 94 if (!force && rpcb_getaddr(prog, vers, ncp, &buf, HOST_SELF)) 95 return (fmd_set_errno(EFMD_RPC_BOUND)); 96 97 if ((fd = t_open(ncp->nc_device, O_RDWR, NULL)) == -1) { 98 fmd_error(EFMD_RPC_REG, "failed to open %s: %s\n", 99 ncp->nc_device, t_strerror(t_errno)); 100 continue; 101 } 102 103 svc_fd_negotiate_ucred(fd); /* enable ucred option on xprt */ 104 105 if ((xprt = svc_tli_create(fd, ncp, NULL, ssz, rsz)) == NULL) { 106 (void) t_close(fd); 107 continue; 108 } 109 110 if (svc_reg(xprt, prog, vers, disp, ncp) == FALSE) { 111 fmd_error(EFMD_RPC_REG, "failed to register " 112 "rpc service on %s\n", ncp->nc_netid); 113 svc_destroy(xprt); 114 continue; 115 } 116 117 n++; 118 } 119 120 (void) endnetconfig(hdl); 121 122 /* 123 * If we failed to register services (n == 0) because rpcbind is down, 124 * then check to see if the RPC door file exists before attempting an 125 * svc_door_create(), which cleverly destroys any existing door file. 126 * The RPC APIs have no stable errnos, so we use rpcb_gettime() as a 127 * hack to determine if rpcbind itself is down. 128 */ 129 if (!force && n == 0 && rpcb_gettime(HOST_SELF, &tm) == FALSE && 130 snprintf(door, sizeof (door), RPC_DOOR_RENDEZVOUS, 131 prog, vers) > 0 && access(door, F_OK) == 0) 132 return (fmd_set_errno(EFMD_RPC_BOUND)); 133 134 /* 135 * Attempt to create a door server for the RPC program as well. Door 136 * servers in fmd must be setup as fmd threads, and fmd_transport_init() 137 * already calls door_server_create() for us. We therefore rely on and 138 * assert that fmd_transport_init() is called before fmd_rpc_init(). 139 */ 140 ASSERT(fmd.d_xprt_chan != NULL); 141 142 if ((xprt = svc_door_create(disp, prog, vers, ssz)) == NULL) { 143 fmd_error(EFMD_RPC_REG, "failed to create door for " 144 "rpc service 0x%lx/0x%lx\n", prog, vers); 145 } else { 146 /* set the maximum request size for the door transport */ 147 (void) svc_control(xprt, SVCSET_CONNMAXREC, &rsz); 148 n++; 149 } 150 151 return (n); 152 } 153 154 static int 155 fmd_rpc_svc_init(void (*disp)(struct svc_req *, SVCXPRT *), 156 const char *name, const char *path, const char *prop, 157 rpcprog_t pmin, rpcprog_t pmax, rpcvers_t vers, 158 uint_t sndsize, uint_t rcvsize, int force) 159 { 160 rpcprog_t prog; 161 char buf[16]; 162 FILE *fp; 163 164 for (prog = pmin; prog <= pmax; prog++) { 165 if (fmd_rpc_svc_create_local(disp, prog, vers, 166 sndsize, rcvsize, force) > 0) { 167 fmd_dprintf(FMD_DBG_RPC, "registered %s rpc service " 168 "as 0x%lx.%lx\n", name, prog, vers); 169 170 /* 171 * To aid simulator scripts, save our RPC "digits" in 172 * the specified file for rendezvous with libfmd_adm. 173 */ 174 if (path != NULL && (fp = fopen(path, "w")) != NULL) { 175 (void) fprintf(fp, "%ld\n", prog); 176 (void) fclose(fp); 177 } 178 179 (void) snprintf(buf, sizeof (buf), "%ld", prog); 180 (void) fmd_conf_setprop(fmd.d_conf, prop, buf); 181 182 return (0); 183 } 184 } 185 186 return (-1); /* errno is set for us */ 187 } 188 189 void 190 fmd_rpc_init(void) 191 { 192 int err, mode = RPC_SVC_MT_USER; 193 const char *errchan, *s; 194 uint64_t sndsize = 0, rcvsize = 0; 195 196 if (rpc_control(RPC_SVC_MTMODE_SET, &mode) == FALSE) 197 fmd_panic("failed to enable user-MT rpc mode"); 198 199 (void) fmd_conf_getprop(fmd.d_conf, "rpc.sndsize", &sndsize); 200 (void) fmd_conf_getprop(fmd.d_conf, "rpc.rcvsize", &rcvsize); 201 202 /* 203 * Infer whether we are the "default" fault manager or an alternate one 204 * based on whether we are subscribed to the default transport or not. 205 */ 206 (void) fmd_conf_getprop(fmd.d_conf, "errchan", &errchan); 207 (void) fmd_conf_getprop(fmd.d_conf, "rpc.adm.path", &s); 208 209 if (errchan != NULL && strcmp(errchan, FM_ERROR_CHAN) == 0) { 210 err = fmd_rpc_svc_init(fmd_adm_1, "FMD_ADM", s, "rpc.adm.prog", 211 FMD_ADM, FMD_ADM, FMD_ADM_VERSION_1, 212 (uint_t)sndsize, (uint_t)rcvsize, TRUE); 213 } else { 214 err = fmd_rpc_svc_init(fmd_adm_1, "FMD_ADM", s, "rpc.adm.prog", 215 RPC_TRANS_MIN, RPC_TRANS_MAX, FMD_ADM_VERSION_1, 216 (uint_t)sndsize, (uint_t)rcvsize, FALSE); 217 } 218 219 if (err != 0) 220 fmd_error(EFMD_EXIT, "failed to create rpc server bindings"); 221 222 if (fmd_thread_create(fmd.d_rmod, (fmd_thread_f *)svc_run, 0) == NULL) 223 fmd_error(EFMD_EXIT, "failed to create rpc server thread"); 224 } 225 226 void 227 fmd_rpc_fini(void) 228 { 229 rpcprog_t prog; 230 231 svc_exit(); /* force svc_run() threads to exit */ 232 233 (void) fmd_conf_getprop(fmd.d_conf, "rpc.adm.prog", &prog); 234 svc_unreg(prog, FMD_ADM_VERSION_1); 235 236 (void) fmd_conf_getprop(fmd.d_conf, "rpc.api.prog", &prog); 237 svc_unreg(prog, FMD_API_VERSION_1); 238 } 239 240 /* 241 * Utillity function to fetch the XPRT's ucred and determine if we should deny 242 * the request. For now, we implement a simple policy of rejecting any caller 243 * who does not have the PRIV_SYS_CONFIG bit in their Effective privilege set, 244 * unless the caller is loading a module, which requires all privileges. 245 */ 246 int 247 fmd_rpc_deny(struct svc_req *rqp) 248 { 249 ucred_t *ucp = alloca(ucred_size()); 250 const priv_set_t *psp; 251 252 if (svc_getcallerucred(rqp->rq_xprt, &ucp) != 0 || 253 (psp = ucred_getprivset(ucp, PRIV_EFFECTIVE)) == NULL) 254 return (1); /* deny access if we can't get credentials */ 255 256 #ifndef DEBUG 257 /* 258 * For convenience of testing, we only require all privileges for a 259 * module load when running a non-DEBUG fault management daemon. 260 */ 261 if (rqp->rq_proc == FMD_ADM_MODLOAD) 262 return (!priv_isfullset(psp)); 263 #endif 264 return (!priv_ismember(psp, PRIV_SYS_CONFIG)); 265 } 266