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_MY_PROG(clnt) = id->my_prog;
177 NL_MY_VERS(clnt) = id->my_vers;
178 NL_MY_PROC(clnt) = id->my_proc;
179 memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
180 clnt->dns_name = dnsname;
183 * Now, Create file on stable storage for host.
185 if (!nsm_insert_monitored_host(dnsname,
186 (struct sockaddr *)(char *)&my_addr, argp)) {
187 nlist_free(NULL, clnt);
191 /* PRC: do the HA callout: */
192 ha_callout("add-client", mon_name, my_name, -1);
193 nlist_insert(&rtnl, clnt);
194 xlog(D_GENERAL, "MONITORING %s for %s", mon_name, my_name);
196 result.res_stat = STAT_SUCC;
197 /* SUN's sm_inter.x says this should be "state number of local site".
198 * X/Open says '"state" will be contain the state of the remote NSM.'
199 * href=http://www.opengroup.org/onlinepubs/9629799/SM_MON.htm
200 * Linux lockd currently (2.6.21 and prior) ignores whatever is
201 * returned, and given the above contraction, it probably always will..
202 * So we just return what we always returned. If possible, we
203 * have already told lockd about our state number via a sysctl.
204 * If lockd wants the remote state, it will need to
205 * use SM_STAT (and prayer).
207 result.state = MY_STATE;
211 xlog_warn("STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
216 load_one_host(const char *hostname,
217 __attribute__ ((unused)) const struct sockaddr *sap,
219 __attribute__ ((unused)) const time_t timestamp)
223 clnt = nlist_new(m->mon_id.my_id.my_name,
224 m->mon_id.mon_name, 0);
228 clnt->dns_name = strdup(hostname);
229 if (clnt->dns_name == NULL) {
230 nlist_free(NULL, clnt);
234 xlog(D_GENERAL, "Adding record for %s to the monitor list...",
237 NL_MY_PROG(clnt) = m->mon_id.my_id.my_prog;
238 NL_MY_VERS(clnt) = m->mon_id.my_id.my_vers;
239 NL_MY_PROC(clnt) = m->mon_id.my_id.my_proc;
240 memcpy(NL_PRIV(clnt), m->priv, SM_PRIV_SIZE);
242 nlist_insert(&rtnl, clnt);
246 void load_state(void)
250 count = nsm_load_monitor_list(load_one_host);
252 xlog(D_GENERAL, "Loaded %u previously monitored hosts");
256 * Services SM_UNMON requests.
258 * There is no statement in the X/Open spec's about returning an error
259 * for requests to unmonitor a host that we're *not* monitoring. I just
260 * return the state of the NSM when I get such foolish requests for lack
261 * of any better ideas. (I also log the "offense.")
264 sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp)
266 static sm_stat result;
268 char *mon_name = argp->mon_name,
269 *my_name = argp->my_id.my_name;
270 struct my_id *id = &argp->my_id;
273 xlog(D_CALL, "Received SM_UNMON for %s from %s", mon_name, my_name);
275 result.state = MY_STATE;
277 if (!caller_is_localhost(rqstp))
280 /* my_name must not have white space */
281 for (cp=my_name ; *cp ; cp++)
282 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
286 /* Check if we're monitoring anyone. */
288 xlog_warn("Received SM_UNMON request from %s for %s while not "
289 "monitoring any hosts", my_name, argp->mon_name);
295 * OK, we are. Now look for appropriate entry in run-time list.
296 * There should only be *one* match on this, since I block "duplicate"
297 * SM_MON calls. (Actually, duplicate calls are allowed, but only one
298 * entry winds up in the list the way I'm currently handling them.)
300 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
301 if (statd_matchhostname(NL_MY_NAME(clnt), my_name) &&
302 NL_MY_PROC(clnt) == id->my_proc &&
303 NL_MY_PROG(clnt) == id->my_prog &&
304 NL_MY_VERS(clnt) == id->my_vers) {
306 xlog(D_GENERAL, "UNMONITORING %s for %s",
309 /* PRC: do the HA callout: */
310 ha_callout("del-client", mon_name, my_name, -1);
312 nsm_delete_monitored_host(clnt->dns_name,
314 nlist_free(&rtnl, clnt);
318 clnt = NL_NEXT(clnt);
322 xlog_warn("Received erroneous SM_UNMON request from %s for %s",
329 sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
332 static sm_stat result;
334 char *my_name = argp->my_name;
336 xlog(D_CALL, "Received SM_UNMON_ALL for %s", my_name);
338 if (!caller_is_localhost(rqstp))
341 result.state = MY_STATE;
344 xlog_warn("Received SM_UNMON_ALL request from %s "
345 "while not monitoring any hosts", my_name);
350 while ((clnt = nlist_gethost(clnt, my_name, 1))) {
351 if (NL_MY_PROC(clnt) == argp->my_proc &&
352 NL_MY_PROG(clnt) == argp->my_prog &&
353 NL_MY_VERS(clnt) == argp->my_vers) {
355 char mon_name[SM_MAXSTRLEN + 1];
359 "UNMONITORING (SM_UNMON_ALL) %s for %s",
360 NL_MON_NAME(clnt), NL_MY_NAME(clnt));
361 strncpy(mon_name, NL_MON_NAME(clnt),
362 sizeof (mon_name) - 1);
363 mon_name[sizeof (mon_name) - 1] = '\0';
364 temp = NL_NEXT(clnt);
365 /* PRC: do the HA callout: */
366 ha_callout("del-client", mon_name, my_name, -1);
367 nsm_delete_monitored_host(clnt->dns_name,
369 nlist_free(&rtnl, clnt);
373 clnt = NL_NEXT(clnt);
377 xlog(D_GENERAL, "SM_UNMON_ALL request from %s with no "
378 "SM_MON requests from it", my_name);