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;
45 struct in_addr my_addr;
47 #ifdef RESTRICTED_STATD
48 struct in_addr caller;
50 struct hostent *hostinfo = NULL;
52 /* Assume that we'll fail. */
53 result.res_stat = STAT_FAIL;
54 result.state = -1; /* State is undefined for STAT_FAIL. */
56 /* Restrict access to statd.
57 * In the light of CERT CA-99.05, we tighten access to
60 #ifdef RESTRICTED_STATD
61 /* 1. Reject anyone not calling from 127.0.0.1.
62 * Ignore the my_name specified by the caller, and
63 * use "127.0.0.1" instead.
65 caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
66 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
68 "Call to statd from non-local host %s",
72 my_addr.s_addr = htonl(INADDR_LOOPBACK);
73 my_name = "127.0.0.1";
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);
131 * Hostnames checked OK.
132 * Now choose a hostname to use for matching. We cannot
133 * really trust much in the incoming NOTIFY, so to make
134 * sure that multi-homed hosts work nicely, we get an
135 * FQDN now, and use that for matching
137 hostinfo = gethostbyaddr(hostinfo->h_addr,
139 hostinfo->h_addrtype);
141 dnsname = xstrdup(hostinfo->h_name);
143 dnsname = xstrdup(my_name);
145 /* Now check to see if this is a duplicate, and warn if so.
146 * I will also return STAT_FAIL. (I *think* this is how I should
149 * Olaf requests that I allow duplicate SM_MON requests for
150 * hosts due to the way he is coding lockd. No problem,
151 * I'll just do a quickie success return and things should
156 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
157 if (matchhostname(NL_MY_NAME(clnt), my_name) &&
158 NL_MY_PROC(clnt) == id->my_proc &&
159 NL_MY_PROG(clnt) == id->my_prog &&
160 NL_MY_VERS(clnt) == id->my_vers &&
161 memcmp(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE) == 0) {
162 /* Hey! We already know you guys! */
164 "Duplicate SM_MON request for %s "
165 "from procedure on %s",
168 /* But we'll let you pass anyway. */
171 clnt = NL_NEXT(clnt);
175 * We're committed...ignoring errors. Let's hope that a malloc()
176 * doesn't fail. (I should probably fix this assumption.)
178 if (!(clnt = nlist_new(my_name, mon_name, 0))) {
179 note(N_WARNING, "out of memory");
183 NL_ADDR(clnt) = my_addr;
184 NL_MY_PROG(clnt) = id->my_prog;
185 NL_MY_VERS(clnt) = id->my_vers;
186 NL_MY_PROC(clnt) = id->my_proc;
187 memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
188 clnt->dns_name = dnsname;
191 * Now, Create file on stable storage for host.
194 path=xmalloc(strlen(SM_DIR)+strlen(dnsname)+2);
195 sprintf(path, "%s/%s", SM_DIR, dnsname);
196 if ((fd = open(path, O_WRONLY|O_SYNC|O_CREAT|O_APPEND,
197 S_IRUSR|S_IWUSR)) < 0) {
198 /* Didn't fly. We won't monitor. */
199 note(N_ERROR, "creat(%s) failed: %s", path, strerror (errno));
200 nlist_free(NULL, clnt);
205 char buf[LINELEN + 1 + SM_MAXSTRLEN + 2];
208 e = buf + sprintf(buf, "%08x %08x %08x %08x ",
209 my_addr.s_addr, id->my_prog,
210 id->my_vers, id->my_proc);
211 for (i=0; i<SM_PRIV_SIZE; i++)
212 e += sprintf(e, "%02x", 0xff & (argp->priv[i]));
213 if (e+1-buf != LINELEN) abort();
214 e += sprintf(e, " %s\n", mon_name);
215 write(fd, buf, e-buf);
219 /* PRC: do the HA callout: */
220 ha_callout("add-client", mon_name, my_name, -1);
221 nlist_insert(&rtnl, clnt);
223 dprintf(N_DEBUG, "MONITORING %s for %s", mon_name, my_name);
225 result.res_stat = STAT_SUCC;
226 /* SUN's sm_inter.x says this should be "state number of local site".
227 * X/Open says '"state" will be contain the state of the remote NSM.'
228 * href=http://www.opengroup.org/onlinepubs/9629799/SM_MON.htm
229 * Linux lockd currently (2.6.21 and prior) ignores whatever is
230 * returned, and given the above contraction, it probably always will..
231 * So we just return what we always returned. If possible, we
232 * have already told lockd about our state number via a sysctl.
233 * If lockd wants the remote state, it will need to
234 * use SM_STAT (and prayer).
236 result.state = MY_STATE;
240 note(N_WARNING, "STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
244 void load_state(void)
248 char buf[LINELEN + 1 + SM_MAXSTRLEN + 2];
253 while ((de = readdir(d))) {
258 if (de->d_name[0] == '.')
260 path = xmalloc(strlen(SM_DIR)+strlen(de->d_name)+2);
261 sprintf(path, "%s/%s", SM_DIR, de->d_name);
262 f = fopen(path, "r");
266 while (fgets(buf, sizeof(buf), f) != NULL) {
267 int addr, proc, prog, vers;
268 char priv[SM_PRIV_SIZE];
273 buf[sizeof(buf)-1] = 0;
274 b = strchr(buf, '\n');
276 sscanf(buf, "%x %x %x %x ",
277 &addr, &prog, &vers, &proc);
279 for (i=0; i<SM_PRIV_SIZE; i++) {
280 sscanf(b, "%2x", &p);
285 clnt = nlist_new("127.0.0.1", b, 0);
288 NL_ADDR(clnt).s_addr = addr;
289 NL_MY_PROG(clnt) = prog;
290 NL_MY_VERS(clnt) = vers;
291 NL_MY_PROC(clnt) = proc;
292 clnt->dns_name = xstrdup(de->d_name);
293 memcpy(NL_PRIV(clnt), priv, SM_PRIV_SIZE);
294 nlist_insert(&rtnl, clnt);
305 * Services SM_UNMON requests.
307 * There is no statement in the X/Open spec's about returning an error
308 * for requests to unmonitor a host that we're *not* monitoring. I just
309 * return the state of the NSM when I get such foolish requests for lack
310 * of any better ideas. (I also log the "offense.")
313 sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp)
315 static sm_stat result;
317 char *mon_name = argp->mon_name,
318 *my_name = argp->my_id.my_name;
319 struct my_id *id = &argp->my_id;
320 #ifdef RESTRICTED_STATD
321 struct in_addr caller;
324 result.state = MY_STATE;
326 #ifdef RESTRICTED_STATD
327 /* 1. Reject anyone not calling from 127.0.0.1.
328 * Ignore the my_name specified by the caller, and
329 * use "127.0.0.1" instead.
331 caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
332 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
334 "Call to statd from non-local host %s",
338 my_name = "127.0.0.1";
341 /* Check if we're monitoring anyone. */
342 if (!(clnt = rtnl)) {
344 "Received SM_UNMON request from %s for %s while not "
345 "monitoring any hosts.", my_name, argp->mon_name);
350 * OK, we are. Now look for appropriate entry in run-time list.
351 * There should only be *one* match on this, since I block "duplicate"
352 * SM_MON calls. (Actually, duplicate calls are allowed, but only one
353 * entry winds up in the list the way I'm currently handling them.)
355 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
356 if (matchhostname(NL_MY_NAME(clnt), my_name) &&
357 NL_MY_PROC(clnt) == id->my_proc &&
358 NL_MY_PROG(clnt) == id->my_prog &&
359 NL_MY_VERS(clnt) == id->my_vers) {
361 dprintf(N_DEBUG, "UNMONITORING %s for %s",
364 /* PRC: do the HA callout: */
365 ha_callout("del-client", mon_name, my_name, -1);
367 nlist_free(&rtnl, clnt);
368 xunlink(SM_DIR, mon_name, 1);
372 clnt = NL_NEXT(clnt);
375 #ifdef RESTRICTED_STATD
378 note(N_WARNING, "Received erroneous SM_UNMON request from %s for %s",
385 sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
388 static sm_stat result;
390 char *my_name = argp->my_name;
391 #ifdef RESTRICTED_STATD
392 struct in_addr caller;
394 /* 1. Reject anyone not calling from 127.0.0.1.
395 * Ignore the my_name specified by the caller, and
396 * use "127.0.0.1" instead.
398 caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
399 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
401 "Call to statd from non-local host %s",
405 my_name = "127.0.0.1";
408 result.state = MY_STATE;
410 if (!(clnt = rtnl)) {
411 note(N_WARNING, "Received SM_UNMON_ALL request from %s "
412 "while not monitoring any hosts", my_name);
416 while ((clnt = nlist_gethost(clnt, my_name, 1))) {
417 if (NL_MY_PROC(clnt) == argp->my_proc &&
418 NL_MY_PROG(clnt) == argp->my_prog &&
419 NL_MY_VERS(clnt) == argp->my_vers) {
421 char mon_name[SM_MAXSTRLEN + 1];
425 "UNMONITORING (SM_UNMON_ALL) %s for %s",
426 NL_MON_NAME(clnt), NL_MY_NAME(clnt));
427 strncpy(mon_name, NL_MON_NAME(clnt),
428 sizeof (mon_name) - 1);
429 mon_name[sizeof (mon_name) - 1] = '\0';
430 temp = NL_NEXT(clnt);
431 /* PRC: do the HA callout: */
432 ha_callout("del-client", mon_name, my_name, -1);
433 nlist_free(&rtnl, clnt);
434 xunlink(SM_DIR, mon_name, 1);
438 clnt = NL_NEXT(clnt);
442 dprintf(N_DEBUG, "SM_UNMON_ALL request from %s with no "
443 "SM_MON requests from it.", my_name);
445 #ifdef RESTRICTED_STATD