* NSM for Linux.
*/
-#include "config.h"
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
#include <fcntl.h>
#include <limits.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
+#include <errno.h>
#include <arpa/inet.h>
-#include "misc.h"
+#include <dirent.h>
+
+#include "sockaddr.h"
+#include "rpcmisc.h"
+#include "nsm.h"
#include "statd.h"
#include "notlist.h"
#include "ha-callout.h"
notify_list * rtnl = NULL; /* Run-time notify list. */
+/*
+ * Reject requests from non-loopback addresses in order
+ * to prevent attack described in CERT CA-99.05.
+ *
+ * Although the kernel contacts the statd service via only IPv4
+ * transports, the statd service can receive other requests, such
+ * as SM_NOTIFY, from remote peers via IPv6.
+ */
+static _Bool
+caller_is_localhost(struct svc_req *rqstp)
+{
+ struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+ char buf[INET6_ADDRSTRLEN];
+
+ if (!nfs_is_v4_loopback(sap))
+ goto out_nonlocal;
+ return true;
+
+out_nonlocal:
+ if (!statd_present_address(sap, buf, sizeof(buf)))
+ buf[0] = '\0';
+ xlog_warn("SM_MON/SM_UNMON call from non-local host %s", buf);
+ return false;
+}
/*
* Services SM_MON requests.
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;
+ char *cp;
notify_list *clnt;
- struct in_addr my_addr;
-#ifdef RESTRICTED_STATD
- struct in_addr mon_addr, caller;
-#else
+ struct sockaddr_in my_addr = {
+ .sin_family = AF_INET,
+ .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
+ };
+ char *dnsname;
struct hostent *hostinfo = NULL;
-#endif
+
+ xlog(D_CALL, "Received SM_MON for %s from %s", mon_name, my_name);
/* 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.
+ /* 1. Reject any remote callers.
* 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)) {
- note(N_WARNING,
- "Call to statd from non-local host %s",
- inet_ntoa(caller));
+ if (!caller_is_localhost(rqstp))
goto failure;
- }
- my_addr.s_addr = htonl(INADDR_LOOPBACK);
- my_name = "127.0.0.1";
/* 2. Reject any registrations for non-lockd services.
*
if (id->my_prog != 100021 ||
(id->my_proc != 16 && id->my_proc != 24))
{
- note(N_WARNING,
- "Attempt to register callback to %d/%d",
+ xlog_warn("Attempt to register callback to %d/%d",
id->my_prog, 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)) {
- note(N_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, '/')) {
- note(N_CRIT, "SM_MON request for hostname containing '/': %s",
- mon_name);
- note(N_CRIT, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
+ if (strchr(mon_name, '/') || mon_name[0] == '.') {
+ xlog(L_ERROR, "SM_MON request for hostname containing '/' "
+ "or starting '.': %s", mon_name);
+ xlog(L_ERROR, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
goto failure;
- } else if (gethostbyname(mon_name) == NULL) {
- note(N_WARNING, "gethostbyname error for %s", mon_name);
+ } else if ((hostinfo = gethostbyname(mon_name)) == NULL) {
+ xlog_warn("gethostbyname error for %s", mon_name);
goto failure;
- } else if (!(hostinfo = gethostbyname(my_name))) {
- note(N_WARNING, "gethostbyname error for %s", my_name);
- goto failure;
- } else
- my_addr = *(struct in_addr *) hostinfo->h_addr;
-#endif
+ }
+
+ /* my_name must not have white space */
+ for (cp=my_name ; *cp ; cp++)
+ if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
+ *cp = '_';
/*
* Hostnames checked OK.
- * Now check to see if this is a duplicate, and warn if so.
+ * Now choose a hostname to use for matching. We cannot
+ * really trust much in the incoming NOTIFY, so to make
+ * sure that multi-homed hosts work nicely, we get an
+ * FQDN now, and use that for matching
+ */
+ hostinfo = gethostbyaddr(hostinfo->h_addr,
+ hostinfo->h_length,
+ hostinfo->h_addrtype);
+ if (hostinfo)
+ dnsname = xstrdup(hostinfo->h_name);
+ else
+ dnsname = xstrdup(my_name);
+
+ /* 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.)
*
* 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(N_DEBUG,
- "Duplicate SM_MON request for %s "
- "from procedure on %s",
- mon_name, my_name);
+ clnt = rtnl;
- /* But we'll let you pass anyway. */
- result.res_stat = STAT_SUCC;
- result.state = MY_STATE;
- return (&result);
- }
- temp = NL_NEXT(temp);
+ while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
+ if (statd_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 &&
+ memcmp(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE) == 0) {
+ /* Hey! We already know you guys! */
+ xlog(D_GENERAL,
+ "Duplicate SM_MON request for %s "
+ "from procedure on %s",
+ mon_name, my_name);
+
+ /* But we'll let you pass anyway. */
+ goto success;
}
+ clnt = NL_NEXT(clnt);
}
/*
* doesn't fail. (I should probably fix this assumption.)
*/
if (!(clnt = nlist_new(my_name, mon_name, 0))) {
- note(N_WARNING, "out of memory");
+ xlog_warn("out of memory");
goto failure;
}
- NL_ADDR(clnt) = my_addr;
+ NL_ADDR(clnt) = my_addr.sin_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);
+ clnt->dns_name = dnsname;
/*
* Now, Create file on stable storage for host.
*/
-
- path=xmalloc(strlen(SM_DIR)+strlen(mon_name)+2);
- sprintf(path, "%s/%s", SM_DIR, mon_name);
- if ((fd = open(path, O_WRONLY|O_SYNC|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
- /* Didn't fly. We won't monitor. */
- note(N_ERROR, "creat(%s) failed: %m", path);
+ if (!nsm_insert_monitored_host(dnsname,
+ (struct sockaddr *)(char *)&my_addr, argp)) {
nlist_free(NULL, clnt);
- free(path);
goto failure;
}
- free(path);
+
/* PRC: do the HA callout: */
ha_callout("add-client", mon_name, my_name, -1);
nlist_insert(&rtnl, clnt);
- close(fd);
-
+ xlog(D_GENERAL, "MONITORING %s for %s", mon_name, my_name);
+ success:
result.res_stat = STAT_SUCC;
+ /* SUN's sm_inter.x says this should be "state number of local site".
+ * X/Open says '"state" will be contain the state of the remote NSM.'
+ * href=http://www.opengroup.org/onlinepubs/9629799/SM_MON.htm
+ * Linux lockd currently (2.6.21 and prior) ignores whatever is
+ * returned, and given the above contraction, it probably always will..
+ * So we just return what we always returned. If possible, we
+ * have already told lockd about our state number via a sysctl.
+ * If lockd wants the remote state, it will need to
+ * use SM_STAT (and prayer).
+ */
result.state = MY_STATE;
- dprintf(N_DEBUG, "MONITORING %s for %s", mon_name, my_name);
return (&result);
failure:
- note(N_WARNING, "STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
+ xlog_warn("STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
return (&result);
}
+static unsigned int
+load_one_host(const char *hostname, const struct sockaddr *sap,
+ const struct mon *m,
+ __attribute__ ((unused)) const time_t timestamp)
+{
+ const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
+ notify_list *clnt;
+
+ clnt = nlist_new(m->mon_id.my_id.my_name,
+ m->mon_id.mon_name, 0);
+ if (clnt == NULL)
+ return 0;
+
+ clnt->dns_name = strdup(hostname);
+ if (clnt->dns_name == NULL) {
+ nlist_free(NULL, clnt);
+ return 0;
+ }
+
+ xlog(D_GENERAL, "Adding record for %s to the monitor list...",
+ hostname);
+
+ NL_ADDR(clnt) = sin->sin_addr;
+ NL_MY_PROG(clnt) = m->mon_id.my_id.my_prog;
+ NL_MY_VERS(clnt) = m->mon_id.my_id.my_vers;
+ NL_MY_PROC(clnt) = m->mon_id.my_id.my_proc;
+ memcpy(NL_PRIV(clnt), m->priv, SM_PRIV_SIZE);
+
+ nlist_insert(&rtnl, clnt);
+ return 1;
+}
+
+void load_state(void)
+{
+ unsigned int count;
+
+ count = nsm_load_monitor_list(load_one_host);
+ if (count)
+ xlog(D_GENERAL, "Loaded %u previously monitored hosts");
+}
/*
* Services SM_UNMON requests.
char *mon_name = argp->mon_name,
*my_name = argp->my_id.my_name;
struct my_id *id = &argp->my_id;
-#ifdef RESTRICTED_STATD
- struct in_addr caller;
-#endif
+ char *cp;
+
+ xlog(D_CALL, "Received SM_UNMON for %s from %s", mon_name, my_name);
result.state = MY_STATE;
-#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)) {
- note(N_WARNING,
- "Call to statd from non-local host %s",
- inet_ntoa(caller));
+ if (!caller_is_localhost(rqstp))
goto failure;
- }
- my_name = "127.0.0.1";
-#endif
+
+ /* my_name must not have white space */
+ for (cp=my_name ; *cp ; cp++)
+ if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
+ *cp = '_';
+
/* Check if we're monitoring anyone. */
- if (!(clnt = rtnl)) {
- note(N_WARNING,
- "Received SM_UNMON request from %s for %s while not "
- "monitoring any hosts.", my_name, argp->mon_name);
+ if (rtnl == NULL) {
+ xlog_warn("Received SM_UNMON request from %s for %s while not "
+ "monitoring any hosts", my_name, argp->mon_name);
return (&result);
}
+ clnt = rtnl;
/*
* OK, we are. Now look for appropriate entry in run-time list.
* 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) &&
+ if (statd_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(N_DEBUG, "UNMONITORING %s for %s",
+ xlog(D_GENERAL, "UNMONITORING %s for %s",
mon_name, my_name);
/* PRC: do the HA callout: */
ha_callout("del-client", mon_name, my_name, -1);
+ nsm_delete_monitored_host(clnt->dns_name,
+ mon_name, my_name);
nlist_free(&rtnl, clnt);
- xunlink(SM_DIR, mon_name, 1);
return (&result);
} else
}
failure:
- note(N_WARNING, "Received erroneous SM_UNMON request from %s for %s",
+ xlog_warn("Received erroneous SM_UNMON request from %s for %s",
my_name, mon_name);
return (&result);
}
static sm_stat result;
notify_list *clnt;
char *my_name = argp->my_name;
-#ifdef RESTRICTED_STATD
- struct in_addr caller;
- /* 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)) {
- note(N_WARNING,
- "Call to statd from non-local host %s",
- inet_ntoa(caller));
+ xlog(D_CALL, "Received SM_UNMON_ALL for %s", my_name);
+
+ if (!caller_is_localhost(rqstp))
goto failure;
- }
- my_name = "127.0.0.1";
-#endif
result.state = MY_STATE;
- if (!(clnt = rtnl)) {
- note(N_WARNING, "Received SM_UNMON_ALL request from %s "
+ if (rtnl == NULL) {
+ xlog_warn("Received SM_UNMON_ALL request from %s "
"while not monitoring any hosts", my_name);
return (&result);
}
+ clnt = rtnl;
while ((clnt = nlist_gethost(clnt, my_name, 1))) {
if (NL_MY_PROC(clnt) == argp->my_proc &&
char mon_name[SM_MAXSTRLEN + 1];
notify_list *temp;
- dprintf(N_DEBUG,
+ xlog(D_GENERAL,
"UNMONITORING (SM_UNMON_ALL) %s for %s",
NL_MON_NAME(clnt), NL_MY_NAME(clnt));
strncpy(mon_name, NL_MON_NAME(clnt),
temp = NL_NEXT(clnt);
/* PRC: do the HA callout: */
ha_callout("del-client", mon_name, my_name, -1);
+ nsm_delete_monitored_host(clnt->dns_name,
+ mon_name, my_name);
nlist_free(&rtnl, clnt);
- xunlink(SM_DIR, mon_name, 1);
++count;
clnt = temp;
} else
}
if (!count) {
- dprintf(N_DEBUG, "SM_UNMON_ALL request from %s with no "
- "SM_MON requests from it.", my_name);
+ xlog(D_GENERAL, "SM_UNMON_ALL request from %s with no "
+ "SM_MON requests from it", my_name);
}
+
failure:
return (&result);
}
projects / nfs-utils.git / blobdiff