2 * Copyright (C) 1995-1999 Jeffrey A. Uphoff
3 * Major rewrite by Olaf Kirch, Dec. 1996.
4 * Modified by H.J. Lu, 1998.
5 * Tighter access control, Olaf Kirch June 1999.
21 #include <arpa/inet.h>
29 #include "ha-callout.h"
31 notify_list * rtnl = NULL; /* Run-time notify list. */
34 * Reject requests from non-loopback addresses in order
35 * to prevent attack described in CERT CA-99.05.
37 * Although the kernel contacts the statd service via only IPv4
38 * transports, the statd service can receive other requests, such
39 * as SM_NOTIFY, from remote peers via IPv6.
42 caller_is_localhost(struct svc_req *rqstp)
44 struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
45 char buf[INET6_ADDRSTRLEN];
47 if (!nfs_is_v4_loopback(sap))
52 if (!statd_present_address(sap, buf, sizeof(buf)))
54 xlog_warn("SM_MON/SM_UNMON call from non-local host %s", buf);
59 * Services SM_MON requests.
62 sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp)
64 static sm_stat_res result;
65 char *mon_name = argp->mon_id.mon_name,
66 *my_name = argp->mon_id.my_id.my_name;
67 struct my_id *id = &argp->mon_id.my_id;
70 struct sockaddr_in my_addr = {
71 .sin_family = AF_INET,
72 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
76 xlog(D_CALL, "Received SM_MON for %s from %s", mon_name, my_name);
78 /* Assume that we'll fail. */
79 result.res_stat = STAT_FAIL;
80 result.state = -1; /* State is undefined for STAT_FAIL. */
82 /* 1. Reject any remote callers.
83 * Ignore the my_name specified by the caller, and
84 * use "127.0.0.1" instead.
86 if (!caller_is_localhost(rqstp))
89 /* 2. Reject any registrations for non-lockd services.
91 * This is specific to the linux kernel lockd, which
92 * makes the callback procedure part of the lockd interface.
93 * It is also prone to break when lockd changes its callback
94 * procedure number -- which, in fact, has now happened once.
95 * There must be a better way.... XXX FIXME
97 if (id->my_prog != 100021 ||
98 (id->my_proc != 16 && id->my_proc != 24))
100 xlog_warn("Attempt to register callback to %d/%d",
101 id->my_prog, id->my_proc);
106 * Check hostnames. If I can't look them up, I won't monitor. This
107 * might not be legal, but it adds a little bit of safety and sanity.
110 /* must check for /'s in hostname! See CERT's CA-96.09 for details. */
111 if (strchr(mon_name, '/') || mon_name[0] == '.') {
112 xlog(L_ERROR, "SM_MON request for hostname containing '/' "
113 "or starting '.': %s", mon_name);
114 xlog(L_ERROR, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
118 /* my_name must not have white space */
119 for (cp=my_name ; *cp ; cp++)
120 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
124 * Hostnames checked OK.
125 * Now choose a hostname to use for matching. We cannot
126 * really trust much in the incoming NOTIFY, so to make
127 * sure that multi-homed hosts work nicely, we get an
128 * FQDN now, and use that for matching.
130 dnsname = statd_canonical_name(mon_name);
131 if (dnsname == NULL) {
132 xlog(L_WARNING, "No canonical hostname found for %s", mon_name);
136 /* Now check to see if this is a duplicate, and warn if so.
137 * I will also return STAT_FAIL. (I *think* this is how I should
140 * Olaf requests that I allow duplicate SM_MON requests for
141 * hosts due to the way he is coding lockd. No problem,
142 * I'll just do a quickie success return and things should
147 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
148 if (statd_matchhostname(NL_MY_NAME(clnt), my_name) &&
149 NL_MY_PROC(clnt) == id->my_proc &&
150 NL_MY_PROG(clnt) == id->my_prog &&
151 NL_MY_VERS(clnt) == id->my_vers &&
152 memcmp(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE) == 0) {
153 /* Hey! We already know you guys! */
155 "Duplicate SM_MON request for %s "
156 "from procedure on %s",
159 /* But we'll let you pass anyway. */
163 clnt = NL_NEXT(clnt);
167 * We're committed...ignoring errors. Let's hope that a malloc()
168 * doesn't fail. (I should probably fix this assumption.)
170 if (!(clnt = nlist_new(my_name, mon_name, 0))) {
172 xlog_warn("out of memory");
176 NL_ADDR(clnt) = my_addr.sin_addr;
177 NL_MY_PROG(clnt) = id->my_prog;
178 NL_MY_VERS(clnt) = id->my_vers;
179 NL_MY_PROC(clnt) = id->my_proc;
180 memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
181 clnt->dns_name = dnsname;
184 * Now, Create file on stable storage for host.
186 if (!nsm_insert_monitored_host(dnsname,
187 (struct sockaddr *)(char *)&my_addr, argp)) {
188 nlist_free(NULL, clnt);
192 /* PRC: do the HA callout: */
193 ha_callout("add-client", mon_name, my_name, -1);
194 nlist_insert(&rtnl, clnt);
195 xlog(D_GENERAL, "MONITORING %s for %s", mon_name, my_name);
197 result.res_stat = STAT_SUCC;
198 /* SUN's sm_inter.x says this should be "state number of local site".
199 * X/Open says '"state" will be contain the state of the remote NSM.'
200 * href=http://www.opengroup.org/onlinepubs/9629799/SM_MON.htm
201 * Linux lockd currently (2.6.21 and prior) ignores whatever is
202 * returned, and given the above contraction, it probably always will..
203 * So we just return what we always returned. If possible, we
204 * have already told lockd about our state number via a sysctl.
205 * If lockd wants the remote state, it will need to
206 * use SM_STAT (and prayer).
208 result.state = MY_STATE;
212 xlog_warn("STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
217 load_one_host(const char *hostname, const struct sockaddr *sap,
219 __attribute__ ((unused)) const time_t timestamp)
221 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
224 clnt = nlist_new(m->mon_id.my_id.my_name,
225 m->mon_id.mon_name, 0);
229 clnt->dns_name = strdup(hostname);
230 if (clnt->dns_name == NULL) {
231 nlist_free(NULL, clnt);
235 xlog(D_GENERAL, "Adding record for %s to the monitor list...",
238 NL_ADDR(clnt) = sin->sin_addr;
239 NL_MY_PROG(clnt) = m->mon_id.my_id.my_prog;
240 NL_MY_VERS(clnt) = m->mon_id.my_id.my_vers;
241 NL_MY_PROC(clnt) = m->mon_id.my_id.my_proc;
242 memcpy(NL_PRIV(clnt), m->priv, SM_PRIV_SIZE);
244 nlist_insert(&rtnl, clnt);
248 void load_state(void)
252 count = nsm_load_monitor_list(load_one_host);
254 xlog(D_GENERAL, "Loaded %u previously monitored hosts");
258 * Services SM_UNMON requests.
260 * There is no statement in the X/Open spec's about returning an error
261 * for requests to unmonitor a host that we're *not* monitoring. I just
262 * return the state of the NSM when I get such foolish requests for lack
263 * of any better ideas. (I also log the "offense.")
266 sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp)
268 static sm_stat result;
270 char *mon_name = argp->mon_name,
271 *my_name = argp->my_id.my_name;
272 struct my_id *id = &argp->my_id;
275 xlog(D_CALL, "Received SM_UNMON for %s from %s", mon_name, my_name);
277 result.state = MY_STATE;
279 if (!caller_is_localhost(rqstp))
282 /* my_name must not have white space */
283 for (cp=my_name ; *cp ; cp++)
284 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
288 /* Check if we're monitoring anyone. */
290 xlog_warn("Received SM_UNMON request from %s for %s while not "
291 "monitoring any hosts", my_name, argp->mon_name);
297 * OK, we are. Now look for appropriate entry in run-time list.
298 * There should only be *one* match on this, since I block "duplicate"
299 * SM_MON calls. (Actually, duplicate calls are allowed, but only one
300 * entry winds up in the list the way I'm currently handling them.)
302 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
303 if (statd_matchhostname(NL_MY_NAME(clnt), my_name) &&
304 NL_MY_PROC(clnt) == id->my_proc &&
305 NL_MY_PROG(clnt) == id->my_prog &&
306 NL_MY_VERS(clnt) == id->my_vers) {
308 xlog(D_GENERAL, "UNMONITORING %s for %s",
311 /* PRC: do the HA callout: */
312 ha_callout("del-client", mon_name, my_name, -1);
314 nsm_delete_monitored_host(clnt->dns_name,
316 nlist_free(&rtnl, clnt);
320 clnt = NL_NEXT(clnt);
324 xlog_warn("Received erroneous SM_UNMON request from %s for %s",
331 sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
334 static sm_stat result;
336 char *my_name = argp->my_name;
338 xlog(D_CALL, "Received SM_UNMON_ALL for %s", my_name);
340 if (!caller_is_localhost(rqstp))
343 result.state = MY_STATE;
346 xlog_warn("Received SM_UNMON_ALL request from %s "
347 "while not monitoring any hosts", my_name);
352 while ((clnt = nlist_gethost(clnt, my_name, 1))) {
353 if (NL_MY_PROC(clnt) == argp->my_proc &&
354 NL_MY_PROG(clnt) == argp->my_prog &&
355 NL_MY_VERS(clnt) == argp->my_vers) {
357 char mon_name[SM_MAXSTRLEN + 1];
361 "UNMONITORING (SM_UNMON_ALL) %s for %s",
362 NL_MON_NAME(clnt), NL_MY_NAME(clnt));
363 strncpy(mon_name, NL_MON_NAME(clnt),
364 sizeof (mon_name) - 1);
365 mon_name[sizeof (mon_name) - 1] = '\0';
366 temp = NL_NEXT(clnt);
367 /* PRC: do the HA callout: */
368 ha_callout("del-client", mon_name, my_name, -1);
369 nsm_delete_monitored_host(clnt->dns_name,
371 nlist_free(&rtnl, clnt);
375 clnt = NL_NEXT(clnt);
379 xlog(D_GENERAL, "SM_UNMON_ALL request from %s with no "
380 "SM_MON requests from it", my_name);