Bring in a hybrid of SunSoft's transport-independent RPC (TI-RPC) and

associated changes that had to happen to make this possible as well as
bugs fixed along the way.

  Bring in required TLI library routines to support this.

  Since we don't support TLI we've essentially copied what NetBSD
  has done, adding a thin layer to emulate direct the TLI calls
  into BSD socket calls.

  This is mostly from Sun's tirpc release that was made in 1994,
  however some fixes were backported from the 1999 release (supposedly
  only made available after this porting effort was underway).

  The submitter has agreed to continue on and bring us up to the
  1999 release.

  Several key features are introduced with this update:
    Client calls are thread safe. (1999 code has server side thread
    safe)
    Updated, a more modern interface.

  Many userland updates were done to bring the code up to par with
  the recent RPC API.

  There is an update to the pthreads library, a function
  pthread_main_np() was added to emulate a function of Sun's threads
  library.

  While we're at it, bring in NetBSD's lockd, it's been far too
  long of a wait.

  New rpcbind(8) replaces portmap(8) (supporting communication over
  an authenticated Unix-domain socket, and by default only allowing
  set and unset requests over that channel). It's much more secure
  than the old portmapper.

  Umount(8), mountd(8), mount_nfs(8), nfsd(8) have also been upgraded
  to support TI-RPC and to support IPV6.

  Umount(8) is also fixed to unmount pathnames longer than 80 chars,
  which are currently truncated by the Kernel statfs structure.

Submitted by: Martin Blapp <mb@imp.ch>
Manpage review: ru
Secure RPC implemented by: wpaul

1 files changed, 568 insertions, 0 deletions

diff --git a/usr.sbin/rpcbind/rpcbind.c b/usr.sbin/rpcbind/rpcbind.c
new file mode 100644
index 0000000..2ddf2c0
--- /dev/null
+++ b/usr.sbin/rpcbind/rpcbind.c
@@ -0,0 +1,568 @@
+/*	$NetBSD: rpcbind.c,v 1.1 2000/06/02 23:15:42 fvdl Exp $	*/
+/*	$FreeBSD$ */
+
+/*
+ * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
+ * unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part.  Users
+ * may copy or modify Sun RPC without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ * 
+ * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
+ * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
+ * 
+ * Sun RPC is provided with no support and without any obligation on the
+ * part of Sun Microsystems, Inc. to assist in its use, correction,
+ * modification or enhancement.
+ * 
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
+ * OR ANY PART THEREOF.
+ * 
+ * In no event will Sun Microsystems, Inc. be liable for any lost revenue
+ * or profits or other special, indirect and consequential damages, even if
+ * Sun has been advised of the possibility of such damages.
+ * 
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California  94043
+ */
+/*
+ * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc.
+ */
+
+/* #ident	"@(#)rpcbind.c	1.19	94/04/25 SMI" */
+
+#if 0
+#ifndef lint
+static	char sccsid[] = "@(#)rpcbind.c 1.35 89/04/21 Copyr 1984 Sun Micro";
+#endif
+#endif
+
+/*
+ * rpcbind.c
+ * Implements the program, version to address mapping for rpc.
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/errno.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/wait.h>
+#include <sys/signal.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <rpc/rpc.h>
+#ifdef PORTMAP
+#include <netinet/in.h>
+#endif
+#include <netdb.h>
+#include <stdio.h>
+#include <netconfig.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <err.h>
+#include <libutil.h>
+#include <pwd.h>
+#include <string.h>
+#include <errno.h>
+#include "rpcbind.h"
+
+/* Global variables */
+int debugging = 0;	/* Tell me what's going on */
+int doabort = 0;	/* When debugging, do an abort on errors */
+rpcblist_ptr list_rbl;	/* A list of version 3/4 rpcbind services */
+
+/* who to suid to if -s is given */
+#define RUN_AS  "daemon"
+
+int runasdaemon = 0;
+int insecure = 0;
+int oldstyle_local = 0;
+int verboselog = 0;
+
+#ifdef WARMSTART
+/* Local Variable */
+static int warmstart = 0;	/* Grab a old copy of registrations */
+#endif
+
+#ifdef PORTMAP
+struct pmaplist *list_pml;	/* A list of version 2 rpcbind services */
+char *udptrans;		/* Name of UDP transport */
+char *tcptrans;		/* Name of TCP transport */
+char *udp_uaddr;	/* Universal UDP address */
+char *tcp_uaddr;	/* Universal TCP address */
+#endif
+static char servname[] = "rpcbind";
+static char superuser[] = "superuser";
+
+int main __P((int, char *[]));
+
+static int init_transport __P((struct netconfig *));
+static void rbllist_add __P((rpcprog_t, rpcvers_t, struct netconfig *,
+			     struct netbuf *));
+static void terminate __P((int));
+static void parseargs __P((int, char *[]));
+
+int
+main(int argc, char *argv[])
+{
+	struct netconfig *nconf;
+	void *nc_handle;	/* Net config handle */
+	struct rlimit rl;
+
+	parseargs(argc, argv);
+
+	getrlimit(RLIMIT_NOFILE, &rl);
+	if (rl.rlim_cur < 128) {
+		if (rl.rlim_max <= 128)
+			rl.rlim_cur = rl.rlim_max;
+		else
+			rl.rlim_cur = 128;
+		setrlimit(RLIMIT_NOFILE, &rl);
+	}
+	openlog("rpcbind", LOG_CONS, LOG_DAEMON);
+	if (geteuid()) { /* This command allowed only to root */
+		fprintf(stderr, "Sorry. You are not superuser\n");
+		exit(1);
+	}
+	nc_handle = setnetconfig(); 	/* open netconfig file */
+	if (nc_handle == NULL) {
+		syslog(LOG_ERR, "could not read /etc/netconfig");
+		exit(1);
+	}
+#ifdef PORTMAP
+	udptrans = "";
+	tcptrans = "";
+#endif
+
+	nconf = getnetconfigent("unix");
+	if (nconf == NULL) {
+		syslog(LOG_ERR, "%s: can't find local transport\n", argv[0]);
+		exit(1);
+	}
+	init_transport(nconf);
+
+	while ((nconf = getnetconfig(nc_handle))) {
+		if (nconf->nc_flag & NC_VISIBLE)
+			init_transport(nconf);
+	}
+	endnetconfig(nc_handle);
+
+	/* catch the usual termination signals for graceful exit */
+	(void) signal(SIGCHLD, reap);
+	(void) signal(SIGINT, terminate);
+	(void) signal(SIGTERM, terminate);
+	(void) signal(SIGQUIT, terminate);
+	/* ignore others that could get sent */
+	(void) signal(SIGPIPE, SIG_IGN);
+	(void) signal(SIGHUP, SIG_IGN);
+	(void) signal(SIGUSR1, SIG_IGN);
+	(void) signal(SIGUSR2, SIG_IGN);
+#ifdef WARMSTART
+	if (warmstart) {
+		read_warmstart();
+	}
+#endif
+	if (debugging) {
+		printf("rpcbind debugging enabled.");
+		if (doabort) {
+			printf("  Will abort on errors!\n");
+		} else {
+			printf("\n");
+		}
+	} else {
+		if (daemon(0, 0))
+			err(1, "fork failed");
+	}
+
+	if (runasdaemon) {
+		struct passwd *p;
+
+		if((p = getpwnam(RUN_AS)) == NULL) {
+			syslog(LOG_ERR, "cannot get uid of daemon: %m");
+			exit(1);
+		}
+		if (setuid(p->pw_uid) == -1) {
+			syslog(LOG_ERR, "setuid to daemon failed: %m");
+			exit(1);
+		}
+	}
+
+	network_init();
+
+	my_svc_run();
+	syslog(LOG_ERR, "svc_run returned unexpectedly");
+	rpcbind_abort();
+	/* NOTREACHED */
+
+	return 0;
+}
+
+/*
+ * Adds the entry into the rpcbind database.
+ * If PORTMAP, then for UDP and TCP, it adds the entries for version 2 also
+ * Returns 0 if succeeds, else fails
+ */
+static int
+init_transport(struct netconfig *nconf)
+{
+	int fd;
+	struct t_bind taddr;
+	struct addrinfo hints, *res = NULL;
+	struct __rpc_sockinfo si;
+	SVCXPRT	*my_xprt;
+	int status;	/* bound checking ? */
+	int aicode;
+	int addrlen;
+	struct sockaddr *sa;
+	struct sockaddr_un sun;
+	mode_t oldmask;
+
+	if ((nconf->nc_semantics != NC_TPI_CLTS) &&
+		(nconf->nc_semantics != NC_TPI_COTS) &&
+		(nconf->nc_semantics != NC_TPI_COTS_ORD))
+		return (1);	/* not my type */
+#ifdef ND_DEBUG
+	if (debugging) {
+		int i;
+		char **s;
+
+		(void) fprintf(stderr, "%s: %ld lookup routines :\n",
+			nconf->nc_netid, nconf->nc_nlookups);
+		for (i = 0, s = nconf->nc_lookups; i < nconf->nc_nlookups;
+		     i++, s++)
+			fprintf(stderr, "[%d] - %s\n", i, *s);
+	}
+#endif
+
+	/*
+	 * XXX - using RPC library internal functions.
+	 */
+	if ((fd = __rpc_nconf2fd(nconf)) < 0) {
+		syslog(LOG_ERR, "cannot create socket for %s", nconf->nc_netid);
+		return (1);
+	}
+
+	if (!__rpc_nconf2sockinfo(nconf, &si)) {
+		syslog(LOG_ERR, "cannot get information for %s",
+		    nconf->nc_netid);
+		return (1);
+	}
+
+	if (!strcmp(nconf->nc_netid, "unix")) {
+		memset(&sun, 0, sizeof sun);
+		sun.sun_family = AF_LOCAL;
+		unlink(_PATH_RPCBINDSOCK);
+		strcpy(sun.sun_path, _PATH_RPCBINDSOCK);
+		sun.sun_len = SUN_LEN(&sun);
+		addrlen = sizeof (struct sockaddr_un);
+		sa = (struct sockaddr *)&sun;
+	} else {
+		/* Get rpcbind's address on this transport */
+
+		memset(&hints, 0, sizeof hints);
+		hints.ai_flags = AI_PASSIVE;
+		hints.ai_family = si.si_af;
+		hints.ai_socktype = si.si_socktype;
+		hints.ai_protocol = si.si_proto;
+		if ((aicode = getaddrinfo(NULL, servname, &hints, &res)) != 0) {
+			syslog(LOG_ERR, "cannot get local address for %s: %s",
+			    nconf->nc_netid, gai_strerror(aicode));
+			return 1;
+		}
+		addrlen = res->ai_addrlen;
+		sa = (struct sockaddr *)res->ai_addr;
+	}
+	oldmask = umask(S_IXUSR|S_IXGRP|S_IXOTH);
+	if (bind(fd, sa, addrlen) < 0) {
+		syslog(LOG_ERR, "cannot bind %s: %m", nconf->nc_netid);
+		if (res != NULL)
+			freeaddrinfo(res);
+		return 1;
+	}
+	(void) umask(oldmask);
+
+	/* Copy the address */
+	taddr.addr.len = taddr.addr.maxlen = addrlen;
+	taddr.addr.buf = malloc(addrlen);
+	if (taddr.addr.buf == NULL) {
+		syslog(LOG_ERR, "cannot allocate memory for %s address",
+		    nconf->nc_netid);
+		if (res != NULL)
+			freeaddrinfo(res);
+		return 1;
+	}
+	memcpy(taddr.addr.buf, sa, addrlen);
+#ifdef ND_DEBUG
+	if (debugging) {
+		/* for debugging print out our universal address */
+		char *uaddr;
+		struct netbuf nb;
+
+		nb.buf = sa;
+		nb.len = nb.maxlen = sa->sa_len;
+		uaddr = taddr2uaddr(nconf, &nb);
+		(void) fprintf(stderr, "rpcbind : my address is %s\n", uaddr);
+		(void) free(uaddr);
+	}
+#endif
+
+	if (res != NULL)
+		freeaddrinfo(res);
+
+	if (nconf->nc_semantics != NC_TPI_CLTS)
+		listen(fd, SOMAXCONN);
+
+	my_xprt = (SVCXPRT *)svc_tli_create(fd, nconf, &taddr, 0, 0);
+	if (my_xprt == (SVCXPRT *)NULL) {
+		syslog(LOG_ERR, "%s: could not create service",
+				nconf->nc_netid);
+		goto error;
+	}
+
+#ifdef PORTMAP
+	/*
+	 * Register both the versions for tcp/ip, udp/ip and local.
+	 */
+	if ((strcmp(nconf->nc_protofmly, NC_INET) == 0 &&
+		(strcmp(nconf->nc_proto, NC_TCP) == 0 ||
+		strcmp(nconf->nc_proto, NC_UDP) == 0)) ||
+		strcmp(nconf->nc_netid, "unix") == 0) {
+		struct pmaplist *pml;
+
+		if (!svc_register(my_xprt, PMAPPROG, PMAPVERS,
+			pmap_service, NULL)) {
+			syslog(LOG_ERR, "could not register on %s",
+					nconf->nc_netid);
+			goto error;
+		}
+		pml = (struct pmaplist *)malloc((u_int)sizeof (struct pmaplist));
+		if (pml == (struct pmaplist *)NULL) {
+			syslog(LOG_ERR, "no memory!");
+			exit(1);
+		}
+		pml->pml_map.pm_prog = PMAPPROG;
+		pml->pml_map.pm_vers = PMAPVERS;
+		pml->pml_map.pm_port = PMAPPORT;
+		if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
+			if (tcptrans[0]) {
+				syslog(LOG_ERR,
+				"cannot have more than one TCP transport");
+				goto error;
+			}
+			tcptrans = strdup(nconf->nc_netid);
+			pml->pml_map.pm_prot = IPPROTO_TCP;
+
+			/* Let's snarf the universal address */
+			/* "h1.h2.h3.h4.p1.p2" */
+			tcp_uaddr = taddr2uaddr(nconf, &taddr.addr);
+		} else if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
+			if (udptrans[0]) {
+				syslog(LOG_ERR,
+				"cannot have more than one UDP transport");
+				goto error;
+			}
+			udptrans = strdup(nconf->nc_netid);
+			pml->pml_map.pm_prot = IPPROTO_UDP;
+
+			/* Let's snarf the universal address */
+			/* "h1.h2.h3.h4.p1.p2" */
+			udp_uaddr = taddr2uaddr(nconf, &taddr.addr);
+		} else if (strcmp(nconf->nc_netid, "unix") == 0)
+			pml->pml_map.pm_prot = IPPROTO_ST;
+		pml->pml_next = list_pml;
+		list_pml = pml;
+
+		/* Add version 3 information */
+		pml = (struct pmaplist *)malloc((u_int)sizeof (struct pmaplist));
+		if (pml == (struct pmaplist *)NULL) {
+			syslog(LOG_ERR, "no memory!");
+			exit(1);
+		}
+		pml->pml_map = list_pml->pml_map;
+		pml->pml_map.pm_vers = RPCBVERS;
+		pml->pml_next = list_pml;
+		list_pml = pml;
+
+		/* Add version 4 information */
+		pml = (struct pmaplist *)malloc((u_int)sizeof (struct pmaplist));
+		if (pml == (struct pmaplist *)NULL) {
+			syslog(LOG_ERR, "no memory!");
+			exit(1);
+		}
+		pml->pml_map = list_pml->pml_map;
+		pml->pml_map.pm_vers = RPCBVERS4;
+		pml->pml_next = list_pml;
+		list_pml = pml;
+
+		/* Also add version 2 stuff to rpcbind list */
+		rbllist_add(PMAPPROG, PMAPVERS, nconf, &taddr.addr);
+	}
+#endif
+
+	/* version 3 registration */
+	if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS, rpcb_service_3, NULL)) {
+		syslog(LOG_ERR, "could not register %s version 3",
+				nconf->nc_netid);
+		goto error;
+	}
+	rbllist_add(RPCBPROG, RPCBVERS, nconf, &taddr.addr);
+
+	/* version 4 registration */
+	if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS4, rpcb_service_4, NULL)) {
+		syslog(LOG_ERR, "could not register %s version 4",
+				nconf->nc_netid);
+		goto error;
+	}
+	rbllist_add(RPCBPROG, RPCBVERS4, nconf, &taddr.addr);
+
+	/* decide if bound checking works for this transport */
+	status = add_bndlist(nconf, &taddr.addr);
+#ifdef BIND_DEBUG
+	if (debugging) {
+		if (status < 0) {
+			fprintf(stderr, "Error in finding bind status for %s\n",
+				nconf->nc_netid);
+		} else if (status == 0) {
+			fprintf(stderr, "check binding for %s\n",
+				nconf->nc_netid);
+		} else if (status > 0) {
+			fprintf(stderr, "No check binding for %s\n",
+				nconf->nc_netid);
+		}
+	}
+#endif
+	/*
+	 * rmtcall only supported on CLTS transports for now.
+	 */
+	if (nconf->nc_semantics == NC_TPI_CLTS) {
+		status = create_rmtcall_fd(nconf);
+
+#ifdef BIND_DEBUG
+		if (debugging) {
+			if (status < 0) {
+				fprintf(stderr,
+				    "Could not create rmtcall fd for %s\n",
+					nconf->nc_netid);
+			} else {
+				fprintf(stderr, "rmtcall fd for %s is %d\n",
+					nconf->nc_netid, status);
+			}
+		}
+#endif
+	}
+	return (0);
+error:
+	close(fd);
+	return (1);
+}
+
+static void
+rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf,
+	    struct netbuf *addr)
+{
+	rpcblist_ptr rbl;
+
+	rbl = (rpcblist_ptr)malloc((u_int)sizeof (rpcblist));
+	if (rbl == (rpcblist_ptr)NULL) {
+		syslog(LOG_ERR, "no memory!");
+		exit(1);
+	}
+
+	rbl->rpcb_map.r_prog = prog;
+	rbl->rpcb_map.r_vers = vers;
+	rbl->rpcb_map.r_netid = strdup(nconf->nc_netid);
+	rbl->rpcb_map.r_addr = taddr2uaddr(nconf, addr);
+	rbl->rpcb_map.r_owner = strdup(superuser);
+	rbl->rpcb_next = list_rbl;	/* Attach to global list */
+	list_rbl = rbl;
+}
+
+/*
+ * Catch the signal and die
+ */
+static void
+terminate(int dummy)
+{
+#ifdef WARMSTART
+	syslog(LOG_ERR,
+		"rpcbind terminating on signal. Restart with \"rpcbind -w\"");
+	write_warmstart();	/* Dump yourself */
+#endif
+	exit(2);
+}
+
+void
+rpcbind_abort()
+{
+#ifdef WARMSTART
+	write_warmstart();	/* Dump yourself */
+#endif
+	abort();
+}
+
+/* get command line options */
+static void
+parseargs(int argc, char *argv[])
+{
+	int c;
+
+	while ((c = getopt(argc, argv, "dwailLs")) != -1) {
+		switch (c) {
+		case 'a':
+			doabort = 1;	/* when debugging, do an abort on */
+			break;		/* errors; for rpcbind developers */
+					/* only! */
+		case 'd':
+			debugging = 1;
+			break;
+		case 'i':
+			insecure = 1;
+			break;
+		case 'L':
+			oldstyle_local = 1;
+			break;
+		case 'l':
+			verboselog = 1;
+			break;
+		case 's':
+			runasdaemon = 1;
+			break;
+#ifdef WARMSTART
+		case 'w':
+			warmstart = 1;
+			break;
+#endif
+		default:	/* error */
+			fprintf(stderr,	"usage: rpcbind [-Idwils]\n");
+			exit (1);
+		}
+	}
+	if (doabort && !debugging) {
+	    fprintf(stderr,
+		"-a (abort) specified without -d (debugging) -- ignored.\n");
+	    doabort = 0;
+	}
+}
+
+void
+reap(int dummy)
+{
+	int save_errno = errno;
+ 
+	while (wait3(NULL, WNOHANG, NULL) > 0)
+		;       
+	errno = save_errno;
+}
+
+void
+toggle_verboselog(int dummy)
+{
+	verboselog = !verboselog;
+}