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 (void) endnetconfig(hdl); 96 return (fmd_set_errno(EFMD_RPC_BOUND)); 97 } 98 99 if ((fd = t_open(ncp->nc_device, O_RDWR, NULL)) == -1) { 100 fmd_error(EFMD_RPC_REG, "failed to open %s: %s\n", 101 ncp->nc_device, t_strerror(t_errno)); 102 continue; 103 } 104 105 svc_fd_negotiate_ucred(fd); /* enable ucred option on xprt */ 106 107 if ((xprt = svc_tli_create(fd, ncp, NULL, ssz, rsz)) == NULL) { 108 (void) t_close(fd); 109 continue; 110 } 111 112 if (svc_reg(xprt, prog, vers, disp, ncp) == FALSE) { 113 fmd_error(EFMD_RPC_REG, "failed to register " 114 "rpc service on %s\n", ncp->nc_netid); 115 svc_destroy(xprt); 116 continue; 117 } 118 119 n++; 120 } 121 122 (void) endnetconfig(hdl); 123 124 /* 125 * If we failed to register services (n == 0) because rpcbind is down, 126 * then check to see if the RPC door file exists before attempting an 127 * svc_door_create(), which cleverly destroys any existing door file. 128 * The RPC APIs have no stable errnos, so we use rpcb_gettime() as a 129 * hack to determine if rpcbind itself is down. 130 */ 131 if (!force && n == 0 && rpcb_gettime(HOST_SELF, &tm) == FALSE && 132 snprintf(door, sizeof (door), RPC_DOOR_RENDEZVOUS, 133 prog, vers) > 0 && access(door, F_OK) == 0) 134 return (fmd_set_errno(EFMD_RPC_BOUND)); 135 136 /* 137 * Attempt to create a door server for the RPC program as well. Limit 138 * the maximum request size for the door transport to the receive size. 139 */ 140 if ((xprt = svc_door_create(disp, prog, vers, ssz)) == NULL) { 141 fmd_error(EFMD_RPC_REG, "failed to create door for " 142 "rpc service 0x%lx/0x%lx\n", prog, vers); 143 } else { 144 (void) svc_control(xprt, SVCSET_CONNMAXREC, &rsz); 145 n++; 146 } 147 148 return (n); 149 } 150 151 static int 152 fmd_rpc_svc_init(void (*disp)(struct svc_req *, SVCXPRT *), 153 const char *name, const char *path, const char *prop, 154 rpcprog_t pmin, rpcprog_t pmax, rpcvers_t vers, 155 uint_t sndsize, uint_t rcvsize, int force) 156 { 157 rpcprog_t prog; 158 char buf[16]; 159 FILE *fp; 160 161 for (prog = pmin; prog <= pmax; prog++) { 162 if (fmd_rpc_svc_create_local(disp, prog, vers, 163 sndsize, rcvsize, force) > 0) { 164 fmd_dprintf(FMD_DBG_RPC, "registered %s rpc service " 165 "as 0x%lx.%lx\n", name, prog, vers); 166 167 /* 168 * To aid simulator scripts, save our RPC "digits" in 169 * the specified file for rendezvous with libfmd_adm. 170 */ 171 if (path != NULL && (fp = fopen(path, "w")) != NULL) { 172 (void) fprintf(fp, "%ld\n", prog); 173 (void) fclose(fp); 174 } 175 176 (void) snprintf(buf, sizeof (buf), "%ld", prog); 177 (void) fmd_conf_setprop(fmd.d_conf, prop, buf); 178 179 return (0); 180 } 181 } 182 183 return (-1); /* errno is set for us */ 184 } 185 186 void 187 fmd_rpc_init(void) 188 { 189 int err, prog, mode = RPC_SVC_MT_USER; 190 uint64_t sndsize = 0, rcvsize = 0; 191 const char *s; 192 193 if (rpc_control(RPC_SVC_MTMODE_SET, &mode) == FALSE) 194 fmd_panic("failed to enable user-MT rpc mode"); 195 196 (void) fmd_conf_getprop(fmd.d_conf, "rpc.sndsize", &sndsize); 197 (void) fmd_conf_getprop(fmd.d_conf, "rpc.rcvsize", &rcvsize); 198 199 /* 200 * Infer whether we are the "default" fault manager or an alternate one 201 * based on whether the initial setting of rpc.adm.prog is non-zero. 202 */ 203 (void) fmd_conf_getprop(fmd.d_conf, "rpc.adm.prog", &prog); 204 (void) fmd_conf_getprop(fmd.d_conf, "rpc.adm.path", &s); 205 206 if (prog != 0) { 207 err = fmd_rpc_svc_init(fmd_adm_1, "FMD_ADM", s, "rpc.adm.prog", 208 FMD_ADM, FMD_ADM, FMD_ADM_VERSION_1, 209 (uint_t)sndsize, (uint_t)rcvsize, TRUE); 210 } else { 211 err = fmd_rpc_svc_init(fmd_adm_1, "FMD_ADM", s, "rpc.adm.prog", 212 RPC_TRANS_MIN, RPC_TRANS_MAX, FMD_ADM_VERSION_1, 213 (uint_t)sndsize, (uint_t)rcvsize, FALSE); 214 } 215 216 if (err != 0) 217 fmd_error(EFMD_EXIT, "failed to create rpc server bindings"); 218 219 if (fmd_thread_create(fmd.d_rmod, (fmd_thread_f *)svc_run, 0) == NULL) 220 fmd_error(EFMD_EXIT, "failed to create rpc server thread"); 221 } 222 223 void 224 fmd_rpc_fini(void) 225 { 226 rpcprog_t prog; 227 228 svc_exit(); /* force svc_run() threads to exit */ 229 230 (void) fmd_conf_getprop(fmd.d_conf, "rpc.adm.prog", &prog); 231 svc_unreg(prog, FMD_ADM_VERSION_1); 232 233 (void) fmd_conf_getprop(fmd.d_conf, "rpc.api.prog", &prog); 234 svc_unreg(prog, FMD_API_VERSION_1); 235 } 236 237 /* 238 * Utillity function to fetch the XPRT's ucred and determine if we should deny 239 * the request. For now, we implement a simple policy of rejecting any caller 240 * who does not have the PRIV_SYS_CONFIG bit in their Effective privilege set, 241 * unless the caller is loading a module, which requires all privileges. 242 */ 243 int 244 fmd_rpc_deny(struct svc_req *rqp) 245 { 246 ucred_t *ucp = alloca(ucred_size()); 247 const priv_set_t *psp; 248 249 if (svc_getcallerucred(rqp->rq_xprt, &ucp) != 0 || 250 (psp = ucred_getprivset(ucp, PRIV_EFFECTIVE)) == NULL) 251 return (1); /* deny access if we can't get credentials */ 252 253 #ifndef DEBUG 254 /* 255 * For convenience of testing, we only require all privileges for a 256 * module load when running a non-DEBUG fault management daemon. 257 */ 258 if (rqp->rq_proc == FMD_ADM_MODLOAD) 259 return (!priv_isfullset(psp)); 260 #endif 261 return (!priv_ismember(psp, PRIV_SYS_CONFIG)); 262 } 263