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.
18 #include <arpa/inet.h>
23 notify_list * rtnl = NULL; /* Run-time notify list. */
27 * Services SM_MON requests.
30 sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp)
32 static sm_stat_res result;
33 char *mon_name = argp->mon_id.mon_name,
34 *my_name = argp->mon_id.my_id.my_name;
35 struct my_id *id = &argp->mon_id.my_id;
39 struct in_addr my_addr;
40 #ifdef RESTRICTED_STATD
41 struct in_addr mon_addr, caller;
43 struct hostent *hostinfo = NULL;
46 /* Assume that we'll fail. */
47 result.res_stat = STAT_FAIL;
48 result.state = -1; /* State is undefined for STAT_FAIL. */
50 /* Restrict access to statd.
51 * In the light of CERT CA-99.05, we tighten access to
54 #ifdef RESTRICTED_STATD
55 /* 1. Reject anyone not calling from 127.0.0.1.
56 * Ignore the my_name specified by the caller, and
57 * use "127.0.0.1" instead.
59 caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
60 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
62 "Call to statd from non-local host %s",
66 my_addr.s_addr = htonl(INADDR_LOOPBACK);
67 my_name = "127.0.0.1";
69 /* 2. Reject any registrations for non-lockd services.
70 * This is specific to the linux kernel lockd, which
71 * makes the callback procedure part of the lockd interface.
73 if (id->my_proc != 100021) {
75 "Attempt to register callback to service %d",
80 /* 3. mon_name must be an address in dotted quad.
81 * Again, specific to the linux kernel lockd.
83 if (!inet_aton(mon_name, &mon_addr)) {
85 "Attempt to register host %s (not a dotted quad)",
91 * Check hostnames. If I can't look them up, I won't monitor. This
92 * might not be legal, but it adds a little bit of safety and sanity.
95 /* must check for /'s in hostname! See CERT's CA-96.09 for details. */
96 if (strchr(mon_name, '/')) {
97 log(L_CRIT, "SM_MON request for hostname containing '/': %s",
99 log(L_CRIT, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
101 } else if (gethostbyname(mon_name) == NULL) {
102 log(L_WARNING, "gethostbyname error for %s", mon_name);
104 } else if (!(hostinfo = gethostbyname(my_name))) {
105 log(L_WARNING, "gethostbyname error for %s", my_name);
108 my_addr = *(struct in_addr *) hostinfo->h_addr;
112 * Hostnames checked OK.
113 * Now check to see if this is a duplicate, and warn if so.
114 * I will also return STAT_FAIL. (I *think* this is how I should
117 * Olaf requests that I allow duplicate SM_MON requests for
118 * hosts due to the way he is coding lockd. No problem,
119 * I'll just do a quickie success return and things should
123 notify_list *temp = rtnl;
125 while ((temp = nlist_gethost(temp, mon_name, 0))) {
126 if (matchhostname(NL_MY_NAME(temp), my_name) &&
127 NL_MY_PROC(temp) == id->my_proc &&
128 NL_MY_PROG(temp) == id->my_prog &&
129 NL_MY_VERS(temp) == id->my_vers) {
130 /* Hey! We already know you guys! */
132 "Duplicate SM_MON request for %s "
133 "from procedure on %s",
136 /* But we'll let you pass anyway. */
137 result.res_stat = STAT_SUCC;
138 result.state = MY_STATE;
141 temp = NL_NEXT(temp);
146 * We're committed...ignoring errors. Let's hope that a malloc()
147 * doesn't fail. (I should probably fix this assumption.)
149 if (!(clnt = nlist_new(my_name, mon_name, 0))) {
150 log(L_WARNING, "out of memory");
154 NL_ADDR(clnt) = my_addr;
155 NL_MY_PROG(clnt) = id->my_prog;
156 NL_MY_VERS(clnt) = id->my_vers;
157 NL_MY_PROC(clnt) = id->my_proc;
158 memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
161 * Now, Create file on stable storage for host.
164 path=xmalloc(strlen(SM_DIR)+strlen(mon_name)+2);
165 sprintf(path, SM_DIR "/%s", mon_name);
166 if ((fd = open(path, O_WRONLY|O_SYNC|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
167 /* Didn't fly. We won't monitor. */
168 log(L_ERROR, "creat(%s) failed: %m", path);
169 nlist_free(NULL, clnt);
174 nlist_insert(&rtnl, clnt);
177 result.res_stat = STAT_SUCC;
178 result.state = MY_STATE;
179 dprintf(L_DEBUG, "MONITORING %s for %s", mon_name, my_name);
183 log(L_WARNING, "STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
189 * Services SM_UNMON requests.
191 * There is no statement in the X/Open spec's about returning an error
192 * for requests to unmonitor a host that we're *not* monitoring. I just
193 * return the state of the NSM when I get such foolish requests for lack
194 * of any better ideas. (I also log the "offense.")
197 sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp)
199 static sm_stat result;
201 char *mon_name = argp->mon_name,
202 *my_name = argp->my_id.my_name;
203 struct my_id *id = &argp->my_id;
205 result.state = MY_STATE;
207 /* Check if we're monitoring anyone. */
208 if (!(clnt = rtnl)) {
210 "Received SM_UNMON request from %s for %s while not "
211 "monitoring any hosts.", my_name, argp->mon_name);
216 * OK, we are. Now look for appropriate entry in run-time list.
217 * There should only be *one* match on this, since I block "duplicate"
218 * SM_MON calls. (Actually, duplicate calls are allowed, but only one
219 * entry winds up in the list the way I'm currently handling them.)
221 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
222 if (matchhostname(NL_MY_NAME(clnt), my_name) &&
223 NL_MY_PROC(clnt) == id->my_proc &&
224 NL_MY_PROG(clnt) == id->my_prog &&
225 NL_MY_VERS(clnt) == id->my_vers) {
227 dprintf(L_DEBUG, "UNMONITORING %s for %s",
229 nlist_free(&rtnl, clnt);
230 xunlink(SM_DIR, mon_name, 1);
234 clnt = NL_NEXT(clnt);
237 log(L_WARNING, "Received erroneous SM_UNMON request from %s for %s",
244 sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
247 static sm_stat result;
250 result.state = MY_STATE;
252 if (!(clnt = rtnl)) {
253 log(L_WARNING, "Received SM_UNMON_ALL request from %s "
254 "while not monitoring any hosts", argp->my_name);
258 while ((clnt = nlist_gethost(clnt, argp->my_name, 1))) {
259 if (NL_MY_PROC(clnt) == argp->my_proc &&
260 NL_MY_PROG(clnt) == argp->my_prog &&
261 NL_MY_VERS(clnt) == argp->my_vers) {
263 char mon_name[SM_MAXSTRLEN + 1];
267 "UNMONITORING (SM_UNMON_ALL) %s for %s",
268 NL_MON_NAME(clnt), NL_MY_NAME(clnt));
269 strncpy(mon_name, NL_MON_NAME(clnt),
270 sizeof (mon_name) - 1);
271 mon_name[sizeof (mon_name) - 1] = '\0';
272 temp = NL_NEXT(clnt);
273 nlist_free(&rtnl, clnt);
274 xunlink(SM_DIR, mon_name, 1);
278 clnt = NL_NEXT(clnt);
282 dprintf(L_DEBUG, "SM_UNMON_ALL request from %s with no "
283 "SM_MON requests from it.", argp->my_name);