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-rw-r--r--utils/statd/monitor.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/utils/statd/monitor.c b/utils/statd/monitor.c
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--- /dev/null
+++ b/utils/statd/monitor.c
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+/*
+ * Copyright (C) 1995-1999 Jeffrey A. Uphoff
+ * Major rewrite by Olaf Kirch, Dec. 1996.
+ * Modified by H.J. Lu, 1998.
+ * Tighter access control, Olaf Kirch June 1999.
+ *
+ * NSM for Linux.
+ */
+
+#include "config.h"
+
+#include <fcntl.h>
+#include <limits.h>
+#include <netdb.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <arpa/inet.h>
+#include "misc.h"
+#include "statd.h"
+#include "notlist.h"
+
+notify_list * rtnl = NULL; /* Run-time notify list. */
+
+
+/*
+ * Services SM_MON requests.
+ */
+struct sm_stat_res *
+sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp)
+{
+ static sm_stat_res result;
+ char *mon_name = argp->mon_id.mon_name,
+ *my_name = argp->mon_id.my_id.my_name;
+ struct my_id *id = &argp->mon_id.my_id;
+ char *path;
+ int fd;
+ notify_list *clnt;
+ struct in_addr my_addr;
+#ifdef RESTRICTED_STATD
+ struct in_addr mon_addr, caller;
+#else
+ struct hostent *hostinfo = NULL;
+#endif
+
+ /* Assume that we'll fail. */
+ result.res_stat = STAT_FAIL;
+ result.state = -1; /* State is undefined for STAT_FAIL. */
+
+ /* Restrict access to statd.
+ * In the light of CERT CA-99.05, we tighten access to
+ * statd. --okir
+ */
+#ifdef RESTRICTED_STATD
+ /* 1. Reject anyone not calling from 127.0.0.1.
+ * Ignore the my_name specified by the caller, and
+ * use "127.0.0.1" instead.
+ */
+ caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
+ if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
+ log(L_WARNING,
+ "Call to statd from non-local host %s",
+ inet_ntoa(caller));
+ goto failure;
+ }
+ my_addr.s_addr = htonl(INADDR_LOOPBACK);
+ my_name = "127.0.0.1";
+
+ /* 2. Reject any registrations for non-lockd services.
+ * This is specific to the linux kernel lockd, which
+ * makes the callback procedure part of the lockd interface.
+ */
+ if (id->my_proc != 100021) {
+ log(L_WARNING,
+ "Attempt to register callback to service %d",
+ id->my_proc);
+ goto failure;
+ }
+
+ /* 3. mon_name must be an address in dotted quad.
+ * Again, specific to the linux kernel lockd.
+ */
+ if (!inet_aton(mon_name, &mon_addr)) {
+ log(L_WARNING,
+ "Attempt to register host %s (not a dotted quad)",
+ mon_name);
+ goto failure;
+ }
+#else
+ /*
+ * Check hostnames. If I can't look them up, I won't monitor. This
+ * might not be legal, but it adds a little bit of safety and sanity.
+ */
+
+ /* must check for /'s in hostname! See CERT's CA-96.09 for details. */
+ if (strchr(mon_name, '/')) {
+ log(L_CRIT, "SM_MON request for hostname containing '/': %s",
+ mon_name);
+ log(L_CRIT, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
+ goto failure;
+ } else if (gethostbyname(mon_name) == NULL) {
+ log(L_WARNING, "gethostbyname error for %s", mon_name);
+ goto failure;
+ } else if (!(hostinfo = gethostbyname(my_name))) {
+ log(L_WARNING, "gethostbyname error for %s", my_name);
+ goto failure;
+ } else
+ my_addr = *(struct in_addr *) hostinfo->h_addr;
+#endif
+
+ /*
+ * Hostnames checked OK.
+ * Now check to see if this is a duplicate, and warn if so.
+ * I will also return STAT_FAIL. (I *think* this is how I should
+ * handle it.)
+ *
+ * Olaf requests that I allow duplicate SM_MON requests for
+ * hosts due to the way he is coding lockd. No problem,
+ * I'll just do a quickie success return and things should
+ * be happy.
+ */
+ if (rtnl) {
+ notify_list *temp = rtnl;
+
+ while ((temp = nlist_gethost(temp, mon_name, 0))) {
+ if (matchhostname(NL_MY_NAME(temp), my_name) &&
+ NL_MY_PROC(temp) == id->my_proc &&
+ NL_MY_PROG(temp) == id->my_prog &&
+ NL_MY_VERS(temp) == id->my_vers) {
+ /* Hey! We already know you guys! */
+ dprintf(L_DEBUG,
+ "Duplicate SM_MON request for %s "
+ "from procedure on %s",
+ mon_name, my_name);
+
+ /* But we'll let you pass anyway. */
+ result.res_stat = STAT_SUCC;
+ result.state = MY_STATE;
+ return (&result);
+ }
+ temp = NL_NEXT(temp);
+ }
+ }
+
+ /*
+ * We're committed...ignoring errors. Let's hope that a malloc()
+ * doesn't fail. (I should probably fix this assumption.)
+ */
+ if (!(clnt = nlist_new(my_name, mon_name, 0))) {
+ log(L_WARNING, "out of memory");
+ goto failure;
+ }
+
+ NL_ADDR(clnt) = my_addr;
+ NL_MY_PROG(clnt) = id->my_prog;
+ NL_MY_VERS(clnt) = id->my_vers;
+ NL_MY_PROC(clnt) = id->my_proc;
+ memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
+
+ /*
+ * Now, Create file on stable storage for host.
+ */
+
+ path=xmalloc(strlen(SM_DIR)+strlen(mon_name)+2);
+ sprintf(path, SM_DIR "/%s", mon_name);
+ if ((fd = open(path, O_WRONLY|O_SYNC|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
+ /* Didn't fly. We won't monitor. */
+ log(L_ERROR, "creat(%s) failed: %m", path);
+ nlist_free(NULL, clnt);
+ free(path);
+ goto failure;
+ }
+ free(path);
+ nlist_insert(&rtnl, clnt);
+ close(fd);
+
+ result.res_stat = STAT_SUCC;
+ result.state = MY_STATE;
+ dprintf(L_DEBUG, "MONITORING %s for %s", mon_name, my_name);
+ return (&result);
+
+failure:
+ log(L_WARNING, "STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
+ return (&result);
+}
+
+
+/*
+ * Services SM_UNMON requests.
+ *
+ * There is no statement in the X/Open spec's about returning an error
+ * for requests to unmonitor a host that we're *not* monitoring. I just
+ * return the state of the NSM when I get such foolish requests for lack
+ * of any better ideas. (I also log the "offense.")
+ */
+struct sm_stat *
+sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp)
+{
+ static sm_stat result;
+ notify_list *clnt;
+ char *mon_name = argp->mon_name,
+ *my_name = argp->my_id.my_name;
+ struct my_id *id = &argp->my_id;
+
+ result.state = MY_STATE;
+
+ /* Check if we're monitoring anyone. */
+ if (!(clnt = rtnl)) {
+ log(L_WARNING,
+ "Received SM_UNMON request from %s for %s while not "
+ "monitoring any hosts.", my_name, argp->mon_name);
+ return (&result);
+ }
+
+ /*
+ * OK, we are. Now look for appropriate entry in run-time list.
+ * There should only be *one* match on this, since I block "duplicate"
+ * SM_MON calls. (Actually, duplicate calls are allowed, but only one
+ * entry winds up in the list the way I'm currently handling them.)
+ */
+ while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
+ if (matchhostname(NL_MY_NAME(clnt), my_name) &&
+ NL_MY_PROC(clnt) == id->my_proc &&
+ NL_MY_PROG(clnt) == id->my_prog &&
+ NL_MY_VERS(clnt) == id->my_vers) {
+ /* Match! */
+ dprintf(L_DEBUG, "UNMONITORING %s for %s",
+ mon_name, my_name);
+ nlist_free(&rtnl, clnt);
+ xunlink(SM_DIR, mon_name, 1);
+
+ return (&result);
+ } else
+ clnt = NL_NEXT(clnt);
+ }
+
+ log(L_WARNING, "Received erroneous SM_UNMON request from %s for %s",
+ my_name, mon_name);
+ return (&result);
+}
+
+
+struct sm_stat *
+sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
+{
+ short int count = 0;
+ static sm_stat result;
+ notify_list *clnt;
+
+ result.state = MY_STATE;
+
+ if (!(clnt = rtnl)) {
+ log(L_WARNING, "Received SM_UNMON_ALL request from %s "
+ "while not monitoring any hosts", argp->my_name);
+ return (&result);
+ }
+
+ while ((clnt = nlist_gethost(clnt, argp->my_name, 1))) {
+ if (NL_MY_PROC(clnt) == argp->my_proc &&
+ NL_MY_PROG(clnt) == argp->my_prog &&
+ NL_MY_VERS(clnt) == argp->my_vers) {
+ /* Watch stack! */
+ char mon_name[SM_MAXSTRLEN + 1];
+ notify_list *temp;
+
+ dprintf(L_DEBUG,
+ "UNMONITORING (SM_UNMON_ALL) %s for %s",
+ NL_MON_NAME(clnt), NL_MY_NAME(clnt));
+ strncpy(mon_name, NL_MON_NAME(clnt),
+ sizeof (mon_name) - 1);
+ mon_name[sizeof (mon_name) - 1] = '\0';
+ temp = NL_NEXT(clnt);
+ nlist_free(&rtnl, clnt);
+ xunlink(SM_DIR, mon_name, 1);
+ ++count;
+ clnt = temp;
+ } else
+ clnt = NL_NEXT(clnt);
+ }
+
+ if (!count) {
+ dprintf(L_DEBUG, "SM_UNMON_ALL request from %s with no "
+ "SM_MON requests from it.", argp->my_name);
+ }
+
+ return (&result);
+}
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