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.
38 caller_is_localhost(struct svc_req *rqstp)
40 struct sockaddr_in *sin = nfs_getrpccaller_in(rqstp->rq_xprt);
41 struct in_addr caller;
43 caller = sin->sin_addr;
44 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
45 xlog_warn("Call to statd from non-local host %s",
53 * Services SM_MON requests.
56 sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp)
58 static sm_stat_res result;
59 char *mon_name = argp->mon_id.mon_name,
60 *my_name = argp->mon_id.my_id.my_name;
61 struct my_id *id = &argp->mon_id.my_id;
64 struct sockaddr_in my_addr = {
65 .sin_family = AF_INET,
66 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
69 struct hostent *hostinfo = NULL;
71 xlog(D_CALL, "Received SM_MON for %s from %s", mon_name, my_name);
73 /* Assume that we'll fail. */
74 result.res_stat = STAT_FAIL;
75 result.state = -1; /* State is undefined for STAT_FAIL. */
77 /* 1. Reject any remote callers.
78 * Ignore the my_name specified by the caller, and
79 * use "127.0.0.1" instead.
81 if (!caller_is_localhost(rqstp))
84 /* 2. Reject any registrations for non-lockd services.
86 * This is specific to the linux kernel lockd, which
87 * makes the callback procedure part of the lockd interface.
88 * It is also prone to break when lockd changes its callback
89 * procedure number -- which, in fact, has now happened once.
90 * There must be a better way.... XXX FIXME
92 if (id->my_prog != 100021 ||
93 (id->my_proc != 16 && id->my_proc != 24))
95 xlog_warn("Attempt to register callback to %d/%d",
96 id->my_prog, id->my_proc);
101 * Check hostnames. If I can't look them up, I won't monitor. This
102 * might not be legal, but it adds a little bit of safety and sanity.
105 /* must check for /'s in hostname! See CERT's CA-96.09 for details. */
106 if (strchr(mon_name, '/') || mon_name[0] == '.') {
107 xlog(L_ERROR, "SM_MON request for hostname containing '/' "
108 "or starting '.': %s", mon_name);
109 xlog(L_ERROR, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
111 } else if ((hostinfo = gethostbyname(mon_name)) == NULL) {
112 xlog_warn("gethostbyname error for %s", mon_name);
116 /* my_name must not have white space */
117 for (cp=my_name ; *cp ; cp++)
118 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
122 * Hostnames checked OK.
123 * Now choose a hostname to use for matching. We cannot
124 * really trust much in the incoming NOTIFY, so to make
125 * sure that multi-homed hosts work nicely, we get an
126 * FQDN now, and use that for matching
128 hostinfo = gethostbyaddr(hostinfo->h_addr,
130 hostinfo->h_addrtype);
132 dnsname = xstrdup(hostinfo->h_name);
134 dnsname = xstrdup(my_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 (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. */
162 clnt = NL_NEXT(clnt);
166 * We're committed...ignoring errors. Let's hope that a malloc()
167 * doesn't fail. (I should probably fix this assumption.)
169 if (!(clnt = nlist_new(my_name, mon_name, 0))) {
170 xlog_warn("out of memory");
174 NL_ADDR(clnt) = my_addr.sin_addr;
175 NL_MY_PROG(clnt) = id->my_prog;
176 NL_MY_VERS(clnt) = id->my_vers;
177 NL_MY_PROC(clnt) = id->my_proc;
178 memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
179 clnt->dns_name = dnsname;
182 * Now, Create file on stable storage for host.
184 if (!nsm_insert_monitored_host(dnsname,
185 (struct sockaddr *)(char *)&my_addr, argp)) {
186 nlist_free(NULL, clnt);
190 /* PRC: do the HA callout: */
191 ha_callout("add-client", mon_name, my_name, -1);
192 nlist_insert(&rtnl, clnt);
193 xlog(D_GENERAL, "MONITORING %s for %s", mon_name, my_name);
195 result.res_stat = STAT_SUCC;
196 /* SUN's sm_inter.x says this should be "state number of local site".
197 * X/Open says '"state" will be contain the state of the remote NSM.'
198 * href=http://www.opengroup.org/onlinepubs/9629799/SM_MON.htm
199 * Linux lockd currently (2.6.21 and prior) ignores whatever is
200 * returned, and given the above contraction, it probably always will..
201 * So we just return what we always returned. If possible, we
202 * have already told lockd about our state number via a sysctl.
203 * If lockd wants the remote state, it will need to
204 * use SM_STAT (and prayer).
206 result.state = MY_STATE;
210 xlog_warn("STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
215 load_one_host(const char *hostname, const struct sockaddr *sap,
217 __attribute__ ((unused)) const time_t timestamp)
219 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
222 clnt = nlist_new(m->mon_id.my_id.my_name,
223 m->mon_id.mon_name, 0);
227 clnt->dns_name = strdup(hostname);
228 if (clnt->dns_name == NULL) {
229 nlist_free(NULL, clnt);
233 xlog(D_GENERAL, "Adding record for %s to the monitor list...",
236 NL_ADDR(clnt) = sin->sin_addr;
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 (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);
313 nlist_free(&rtnl, clnt);
317 clnt = NL_NEXT(clnt);
321 xlog_warn("Received erroneous SM_UNMON request from %s for %s",
328 sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
331 static sm_stat result;
333 char *my_name = argp->my_name;
335 xlog(D_CALL, "Received SM_UNMON_ALL for %s", my_name);
337 if (!caller_is_localhost(rqstp))
340 result.state = MY_STATE;
343 xlog_warn("Received SM_UNMON_ALL request from %s "
344 "while not monitoring any hosts", my_name);
349 while ((clnt = nlist_gethost(clnt, my_name, 1))) {
350 if (NL_MY_PROC(clnt) == argp->my_proc &&
351 NL_MY_PROG(clnt) == argp->my_prog &&
352 NL_MY_VERS(clnt) == argp->my_vers) {
354 char mon_name[SM_MAXSTRLEN + 1];
358 "UNMONITORING (SM_UNMON_ALL) %s for %s",
359 NL_MON_NAME(clnt), NL_MY_NAME(clnt));
360 strncpy(mon_name, NL_MON_NAME(clnt),
361 sizeof (mon_name) - 1);
362 mon_name[sizeof (mon_name) - 1] = '\0';
363 temp = NL_NEXT(clnt);
364 /* PRC: do the HA callout: */
365 ha_callout("del-client", mon_name, my_name, -1);
366 nsm_delete_monitored_host(clnt->dns_name);
367 nlist_free(&rtnl, clnt);
371 clnt = NL_NEXT(clnt);
375 xlog(D_GENERAL, "SM_UNMON_ALL request from %s with no "
376 "SM_MON requests from it", my_name);