X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fstatd%2Fmonitor.c;h=169cd78ac82b17a99c5ce90850bb97f4d4fac901;hp=5fcab1d424247711070db3c2bbcc612b34a798d2;hb=27a49079b03316eebcbc74197b73988b01b58ecc;hpb=e6da8bc0d56d3106d663ab056b1ca484713f4d77 diff --git a/utils/statd/monitor.c b/utils/statd/monitor.c index 5fcab1d..169cd78 100644 --- a/utils/statd/monitor.c +++ b/utils/statd/monitor.c @@ -20,6 +20,8 @@ #include #include #include + +#include "rpcmisc.h" #include "misc.h" #include "statd.h" #include "notlist.h" @@ -29,6 +31,26 @@ notify_list * rtnl = NULL; /* Run-time notify list. */ #define LINELEN (4*(8+1)+SM_PRIV_SIZE*2+1) +/* + * Reject requests from non-loopback addresses in order + * to prevent attack described in CERT CA-99.05. + */ +static int +caller_is_localhost(struct svc_req *rqstp) +{ + struct sockaddr_in *sin = nfs_getrpccaller_in(rqstp->rq_xprt); + struct in_addr caller; + + caller = sin->sin_addr; + if (caller.s_addr != htonl(INADDR_LOOPBACK)) { + note(N_WARNING, + "Call to statd from non-local host %s", + inet_ntoa(caller)); + return 0; + } + return 1; +} + /* * Services SM_MON requests. */ @@ -40,37 +62,24 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) *my_name = argp->mon_id.my_id.my_name; struct my_id *id = &argp->mon_id.my_id; char *path; + char *cp; int fd; notify_list *clnt; struct in_addr my_addr; -#ifdef RESTRICTED_STATD - struct in_addr caller; -#else + char *dnsname; 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. + /* 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. * @@ -89,22 +98,6 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) goto failure; } -#if 0 - This is not usable anymore. Linux-kernel can be configured to use - host names with NSM so that multi-homed hosts are handled properly. - NeilBrown 15mar2007 - - /* 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; - } -#endif -#endif /* * 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. @@ -116,21 +109,32 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) "or starting '.': %s", mon_name); note(N_CRIT, "POSSIBLE SPOOF/ATTACK ATTEMPT!"); goto failure; - } else if (gethostbyname(mon_name) == NULL) { + } else if ((hostinfo = gethostbyname(mon_name)) == NULL) { note(N_WARNING, "gethostbyname error for %s", mon_name); goto failure; } -#ifndef RESTRICTED_STATD - 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.) * @@ -145,7 +149,8 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) 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) { + NL_MY_VERS(clnt) == id->my_vers && + memcmp(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE) == 0) { /* Hey! We already know you guys! */ dprintf(N_DEBUG, "Duplicate SM_MON request for %s " @@ -153,9 +158,7 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) mon_name, my_name); /* But we'll let you pass anyway. */ - result.res_stat = STAT_SUCC; - result.state = MY_STATE; - return (&result); + goto success; } clnt = NL_NEXT(clnt); } @@ -174,13 +177,14 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) 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); + path=xmalloc(strlen(SM_DIR)+strlen(dnsname)+2); + sprintf(path, "%s/%s", SM_DIR, dnsname); if ((fd = open(path, O_WRONLY|O_SYNC|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) < 0) { /* Didn't fly. We won't monitor. */ @@ -190,7 +194,7 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) goto failure; } { - char buf[LINELEN + 1 + SM_MAXSTRLEN + 2]; + char buf[LINELEN + 1 + SM_MAXSTRLEN*2 + 4]; char *e; int i; e = buf + sprintf(buf, "%08x %08x %08x %08x ", @@ -199,7 +203,7 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) for (i=0; ipriv[i])); if (e+1-buf != LINELEN) abort(); - e += sprintf(e, " %s\n", mon_name); + e += sprintf(e, " %s %s\n", mon_name, my_name); write(fd, buf, e-buf); } @@ -208,10 +212,20 @@ sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp) ha_callout("add-client", mon_name, my_name, -1); nlist_insert(&rtnl, clnt); close(fd); - + dprintf(N_DEBUG, "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: @@ -244,6 +258,7 @@ void load_state(void) while (fgets(buf, sizeof(buf), f) != NULL) { int addr, proc, prog, vers; char priv[SM_PRIV_SIZE]; + char *monname, *myname; char *b; int i; notify_list *clnt; @@ -260,13 +275,19 @@ void load_state(void) b += 2; } b++; - clnt = nlist_new("127.0.0.1", b, 0); + monname = b; + while (*b && *b != ' ') b++; + if (*b) *b++ = '\0'; + while (*b == ' ') b++; + myname = b; + clnt = nlist_new(myname, monname, 0); if (!clnt) break; NL_ADDR(clnt).s_addr = addr; NL_MY_PROG(clnt) = prog; NL_MY_VERS(clnt) = vers; NL_MY_PROC(clnt) = proc; + clnt->dns_name = xstrdup(de->d_name); memcpy(NL_PRIV(clnt), priv, SM_PRIV_SIZE); nlist_insert(&rtnl, clnt); } @@ -294,34 +315,27 @@ sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp) 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; 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)) { + if (rtnl == NULL) { note(N_WARNING, "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. @@ -341,17 +355,15 @@ sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp) /* PRC: do the HA callout: */ ha_callout("del-client", mon_name, my_name, -1); + xunlink(SM_DIR, clnt->dns_name); nlist_free(&rtnl, clnt); - xunlink(SM_DIR, mon_name, 1); return (&result); } else clnt = NL_NEXT(clnt); } -#ifdef RESTRICTED_STATD failure: -#endif note(N_WARNING, "Received erroneous SM_UNMON request from %s for %s", my_name, mon_name); return (&result); @@ -365,30 +377,18 @@ sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp) 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)); + if (!caller_is_localhost(rqstp)) goto failure; - } - my_name = "127.0.0.1"; -#endif result.state = MY_STATE; - if (!(clnt = rtnl)) { + if (rtnl == NULL) { note(N_WARNING, "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 && @@ -407,8 +407,8 @@ sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp) temp = NL_NEXT(clnt); /* PRC: do the HA callout: */ ha_callout("del-client", mon_name, my_name, -1); + xunlink(SM_DIR, clnt->dns_name); nlist_free(&rtnl, clnt); - xunlink(SM_DIR, mon_name, 1); ++count; clnt = temp; } else @@ -419,8 +419,7 @@ sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp) dprintf(N_DEBUG, "SM_UNMON_ALL request from %s with no " "SM_MON requests from it.", my_name); } -#ifdef RESTRICTED_STATD + failure: -#endif return (&result); }