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>
26 #include "ha-callout.h"
28 notify_list * rtnl = NULL; /* Run-time notify list. */
30 #define LINELEN (4*(8+1)+SM_PRIV_SIZE*2+1)
33 * Services SM_MON requests.
36 sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp)
38 static sm_stat_res result;
39 char *mon_name = argp->mon_id.mon_name,
40 *my_name = argp->mon_id.my_id.my_name;
41 struct my_id *id = &argp->mon_id.my_id;
46 struct in_addr my_addr;
48 #ifdef RESTRICTED_STATD
49 struct in_addr caller;
51 struct hostent *hostinfo = NULL;
53 /* Assume that we'll fail. */
54 result.res_stat = STAT_FAIL;
55 result.state = -1; /* State is undefined for STAT_FAIL. */
57 /* Restrict access to statd.
58 * In the light of CERT CA-99.05, we tighten access to
61 #ifdef RESTRICTED_STATD
62 /* 1. Reject anyone not calling from 127.0.0.1.
63 * Ignore the my_name specified by the caller, and
64 * use "127.0.0.1" instead.
66 caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
67 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
69 "Call to statd from non-local host %s",
73 my_addr.s_addr = htonl(INADDR_LOOPBACK);
75 /* 2. Reject any registrations for non-lockd services.
77 * This is specific to the linux kernel lockd, which
78 * makes the callback procedure part of the lockd interface.
79 * It is also prone to break when lockd changes its callback
80 * procedure number -- which, in fact, has now happened once.
81 * There must be a better way.... XXX FIXME
83 if (id->my_prog != 100021 ||
84 (id->my_proc != 16 && id->my_proc != 24))
87 "Attempt to register callback to %d/%d",
88 id->my_prog, id->my_proc);
93 This is not usable anymore. Linux-kernel can be configured to use
94 host names with NSM so that multi-homed hosts are handled properly.
97 /* 3. mon_name must be an address in dotted quad.
98 * Again, specific to the linux kernel lockd.
100 if (!inet_aton(mon_name, &mon_addr)) {
102 "Attempt to register host %s (not a dotted quad)",
108 if (!(hostinfo = gethostbyname(my_name))) {
109 note(N_WARNING, "gethostbyname error for %s", my_name);
112 my_addr = *(struct in_addr *) hostinfo->h_addr;
115 * Check hostnames. If I can't look them up, I won't monitor. This
116 * might not be legal, but it adds a little bit of safety and sanity.
119 /* must check for /'s in hostname! See CERT's CA-96.09 for details. */
120 if (strchr(mon_name, '/') || mon_name[0] == '.') {
121 note(N_CRIT, "SM_MON request for hostname containing '/' "
122 "or starting '.': %s", mon_name);
123 note(N_CRIT, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
125 } else if ((hostinfo = gethostbyname(mon_name)) == NULL) {
126 note(N_WARNING, "gethostbyname error for %s", mon_name);
130 /* my_name must not have white space */
131 for (cp=my_name ; *cp ; cp++)
132 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
136 * Hostnames checked OK.
137 * Now choose a hostname to use for matching. We cannot
138 * really trust much in the incoming NOTIFY, so to make
139 * sure that multi-homed hosts work nicely, we get an
140 * FQDN now, and use that for matching
142 hostinfo = gethostbyaddr(hostinfo->h_addr,
144 hostinfo->h_addrtype);
146 dnsname = xstrdup(hostinfo->h_name);
148 dnsname = xstrdup(my_name);
150 /* Now check to see if this is a duplicate, and warn if so.
151 * I will also return STAT_FAIL. (I *think* this is how I should
154 * Olaf requests that I allow duplicate SM_MON requests for
155 * hosts due to the way he is coding lockd. No problem,
156 * I'll just do a quickie success return and things should
161 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
162 if (matchhostname(NL_MY_NAME(clnt), my_name) &&
163 NL_MY_PROC(clnt) == id->my_proc &&
164 NL_MY_PROG(clnt) == id->my_prog &&
165 NL_MY_VERS(clnt) == id->my_vers &&
166 memcmp(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE) == 0) {
167 /* Hey! We already know you guys! */
169 "Duplicate SM_MON request for %s "
170 "from procedure on %s",
173 /* But we'll let you pass anyway. */
176 clnt = NL_NEXT(clnt);
180 * We're committed...ignoring errors. Let's hope that a malloc()
181 * doesn't fail. (I should probably fix this assumption.)
183 if (!(clnt = nlist_new(my_name, mon_name, 0))) {
184 note(N_WARNING, "out of memory");
188 NL_ADDR(clnt) = my_addr;
189 NL_MY_PROG(clnt) = id->my_prog;
190 NL_MY_VERS(clnt) = id->my_vers;
191 NL_MY_PROC(clnt) = id->my_proc;
192 memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
193 clnt->dns_name = dnsname;
196 * Now, Create file on stable storage for host.
199 path=xmalloc(strlen(SM_DIR)+strlen(dnsname)+2);
200 sprintf(path, "%s/%s", SM_DIR, dnsname);
201 if ((fd = open(path, O_WRONLY|O_SYNC|O_CREAT|O_APPEND,
202 S_IRUSR|S_IWUSR)) < 0) {
203 /* Didn't fly. We won't monitor. */
204 note(N_ERROR, "creat(%s) failed: %s", path, strerror (errno));
205 nlist_free(NULL, clnt);
210 char buf[LINELEN + 1 + SM_MAXSTRLEN*2 + 4];
213 e = buf + sprintf(buf, "%08x %08x %08x %08x ",
214 my_addr.s_addr, id->my_prog,
215 id->my_vers, id->my_proc);
216 for (i=0; i<SM_PRIV_SIZE; i++)
217 e += sprintf(e, "%02x", 0xff & (argp->priv[i]));
218 if (e+1-buf != LINELEN) abort();
219 e += sprintf(e, " %s %s\n", mon_name, my_name);
220 write(fd, buf, e-buf);
224 /* PRC: do the HA callout: */
225 ha_callout("add-client", mon_name, my_name, -1);
226 nlist_insert(&rtnl, clnt);
228 dprintf(N_DEBUG, "MONITORING %s for %s", mon_name, my_name);
230 result.res_stat = STAT_SUCC;
231 /* SUN's sm_inter.x says this should be "state number of local site".
232 * X/Open says '"state" will be contain the state of the remote NSM.'
233 * href=http://www.opengroup.org/onlinepubs/9629799/SM_MON.htm
234 * Linux lockd currently (2.6.21 and prior) ignores whatever is
235 * returned, and given the above contraction, it probably always will..
236 * So we just return what we always returned. If possible, we
237 * have already told lockd about our state number via a sysctl.
238 * If lockd wants the remote state, it will need to
239 * use SM_STAT (and prayer).
241 result.state = MY_STATE;
245 note(N_WARNING, "STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
249 void load_state(void)
253 char buf[LINELEN + 1 + SM_MAXSTRLEN + 2];
258 while ((de = readdir(d))) {
263 if (de->d_name[0] == '.')
265 path = xmalloc(strlen(SM_DIR)+strlen(de->d_name)+2);
266 sprintf(path, "%s/%s", SM_DIR, de->d_name);
267 f = fopen(path, "r");
271 while (fgets(buf, sizeof(buf), f) != NULL) {
272 int addr, proc, prog, vers;
273 char priv[SM_PRIV_SIZE];
274 char *monname, *myname;
279 buf[sizeof(buf)-1] = 0;
280 b = strchr(buf, '\n');
282 sscanf(buf, "%x %x %x %x ",
283 &addr, &prog, &vers, &proc);
285 for (i=0; i<SM_PRIV_SIZE; i++) {
286 sscanf(b, "%2x", &p);
292 while (*b && *b != ' ') b++;
294 while (*b == ' ') b++;
296 clnt = nlist_new(myname, monname, 0);
299 NL_ADDR(clnt).s_addr = addr;
300 NL_MY_PROG(clnt) = prog;
301 NL_MY_VERS(clnt) = vers;
302 NL_MY_PROC(clnt) = proc;
303 clnt->dns_name = xstrdup(de->d_name);
304 memcpy(NL_PRIV(clnt), priv, SM_PRIV_SIZE);
305 nlist_insert(&rtnl, clnt);
316 * Services SM_UNMON requests.
318 * There is no statement in the X/Open spec's about returning an error
319 * for requests to unmonitor a host that we're *not* monitoring. I just
320 * return the state of the NSM when I get such foolish requests for lack
321 * of any better ideas. (I also log the "offense.")
324 sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp)
326 static sm_stat result;
328 char *mon_name = argp->mon_name,
329 *my_name = argp->my_id.my_name;
330 struct my_id *id = &argp->my_id;
332 #ifdef RESTRICTED_STATD
333 struct in_addr caller;
336 result.state = MY_STATE;
338 #ifdef RESTRICTED_STATD
339 /* 1. Reject anyone not calling from 127.0.0.1.
340 * Ignore the my_name specified by the caller, and
341 * use "127.0.0.1" instead.
343 caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
344 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
346 "Call to statd from non-local host %s",
351 /* my_name must not have white space */
352 for (cp=my_name ; *cp ; cp++)
353 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
357 /* Check if we're monitoring anyone. */
358 if (!(clnt = rtnl)) {
360 "Received SM_UNMON request from %s for %s while not "
361 "monitoring any hosts.", my_name, argp->mon_name);
366 * OK, we are. Now look for appropriate entry in run-time list.
367 * There should only be *one* match on this, since I block "duplicate"
368 * SM_MON calls. (Actually, duplicate calls are allowed, but only one
369 * entry winds up in the list the way I'm currently handling them.)
371 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
372 if (matchhostname(NL_MY_NAME(clnt), my_name) &&
373 NL_MY_PROC(clnt) == id->my_proc &&
374 NL_MY_PROG(clnt) == id->my_prog &&
375 NL_MY_VERS(clnt) == id->my_vers) {
377 dprintf(N_DEBUG, "UNMONITORING %s for %s",
380 /* PRC: do the HA callout: */
381 ha_callout("del-client", mon_name, my_name, -1);
383 xunlink(SM_DIR, clnt->dns_name, 1);
384 nlist_free(&rtnl, clnt);
388 clnt = NL_NEXT(clnt);
391 #ifdef RESTRICTED_STATD
394 note(N_WARNING, "Received erroneous SM_UNMON request from %s for %s",
401 sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
404 static sm_stat result;
406 char *my_name = argp->my_name;
407 #ifdef RESTRICTED_STATD
408 struct in_addr caller;
410 /* 1. Reject anyone not calling from 127.0.0.1.
411 * Ignore the my_name specified by the caller, and
412 * use "127.0.0.1" instead.
414 caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
415 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
417 "Call to statd from non-local host %s",
423 result.state = MY_STATE;
425 if (!(clnt = rtnl)) {
426 note(N_WARNING, "Received SM_UNMON_ALL request from %s "
427 "while not monitoring any hosts", my_name);
431 while ((clnt = nlist_gethost(clnt, my_name, 1))) {
432 if (NL_MY_PROC(clnt) == argp->my_proc &&
433 NL_MY_PROG(clnt) == argp->my_prog &&
434 NL_MY_VERS(clnt) == argp->my_vers) {
436 char mon_name[SM_MAXSTRLEN + 1];
440 "UNMONITORING (SM_UNMON_ALL) %s for %s",
441 NL_MON_NAME(clnt), NL_MY_NAME(clnt));
442 strncpy(mon_name, NL_MON_NAME(clnt),
443 sizeof (mon_name) - 1);
444 mon_name[sizeof (mon_name) - 1] = '\0';
445 temp = NL_NEXT(clnt);
446 /* PRC: do the HA callout: */
447 ha_callout("del-client", mon_name, my_name, -1);
448 xunlink(SM_DIR, clnt->dns_name, 1);
449 nlist_free(&rtnl, clnt);
453 clnt = NL_NEXT(clnt);
457 dprintf(N_DEBUG, "SM_UNMON_ALL request from %s with no "
458 "SM_MON requests from it.", my_name);
460 #ifdef RESTRICTED_STATD