rcmd.c revision 92889
11573Srgrimes/* 21573Srgrimes * Copyright (c) 1983, 1993, 1994 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 3252859Sache * 3363682Sume * $FreeBSD: head/lib/libc/net/rcmd.c 92889 2002-03-21 18:49:23Z obrien $ 341573Srgrimes */ 351573Srgrimes 361573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 371573Srgrimesstatic char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94"; 381573Srgrimes#endif /* LIBC_SCCS and not lint */ 391573Srgrimes 4071579Sdeischen#include "namespace.h" 411573Srgrimes#include <sys/param.h> 421573Srgrimes#include <sys/socket.h> 431573Srgrimes#include <sys/stat.h> 441573Srgrimes 451573Srgrimes#include <netinet/in.h> 461573Srgrimes#include <arpa/inet.h> 471573Srgrimes 481573Srgrimes#include <signal.h> 491573Srgrimes#include <fcntl.h> 501573Srgrimes#include <netdb.h> 5185342Simp#include <stdlib.h> 521573Srgrimes#include <unistd.h> 531573Srgrimes#include <pwd.h> 541573Srgrimes#include <errno.h> 551573Srgrimes#include <stdio.h> 561573Srgrimes#include <ctype.h> 571573Srgrimes#include <string.h> 589978Swpaul#ifdef YP 599978Swpaul#include <rpc/rpc.h> 609978Swpaul#include <rpcsvc/yp_prot.h> 619978Swpaul#include <rpcsvc/ypclnt.h> 629978Swpaul#endif 6363682Sume#include <arpa/nameser.h> 6471579Sdeischen#include "un-namespace.h" 651573Srgrimes 6655918Sshin/* wrapper for KAME-special getnameinfo() */ 6755918Sshin#ifndef NI_WITHSCOPEID 6855918Sshin#define NI_WITHSCOPEID 0 6955918Sshin#endif 7055918Sshin 7117141Sjkhextern int innetgr __P(( const char *, const char *, const char *, const char * )); 7217141Sjkh 732592Scsgr#define max(a, b) ((a > b) ? a : b) 742592Scsgr 7539979Sdfrint __ivaliduser __P((FILE *, u_int32_t, const char *, const char *)); 7669575Sumeint __ivaliduser_af __P((FILE *,const void *, const char *, const char *, 7769575Sume int, int)); 7869575Sumeint __ivaliduser_sa __P((FILE *, const struct sockaddr *, socklen_t, 7969575Sume const char *,const char *)); 8069575Sumestatic int __icheckhost __P((const struct sockaddr *, socklen_t, 8169575Sume const char *)); 821573Srgrimes 8369575Sumechar paddr[NI_MAXHOST]; 8455918Sshin 851573Srgrimesint 861573Srgrimesrcmd(ahost, rport, locuser, remuser, cmd, fd2p) 871573Srgrimes char **ahost; 881573Srgrimes u_short rport; 891573Srgrimes const char *locuser, *remuser, *cmd; 901573Srgrimes int *fd2p; 911573Srgrimes{ 9256590Sshin return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 9356590Sshin} 9456590Sshin 9556590Sshinint 9656590Sshinrcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af) 9756590Sshin char **ahost; 9856590Sshin u_short rport; 9956590Sshin const char *locuser, *remuser, *cmd; 10056590Sshin int *fd2p; 10156590Sshin int af; 10256590Sshin{ 10355918Sshin struct addrinfo hints, *res, *ai; 10455918Sshin struct sockaddr_storage from; 1051573Srgrimes fd_set reads; 10671579Sdeischen sigset_t oldmask, newmask; 1071573Srgrimes pid_t pid; 10855918Sshin int s, aport, lport, timo, error; 10985342Simp char c, *p; 11069575Sume int refused, nres; 11163682Sume char num[8]; 11263682Sume static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 1131573Srgrimes 11485342Simp /* call rcmdsh() with specified remote shell if appropriate. */ 11585342Simp if (!issetugid() && (p = getenv("RSH"))) { 11685342Simp struct servent *sp = getservbyname("shell", "tcp"); 11785342Simp 11885342Simp if (sp && sp->s_port == rport) 11985342Simp return (rcmdsh(ahost, rport, locuser, remuser, 12085342Simp cmd, p)); 12185342Simp } 12285342Simp 12385342Simp /* use rsh(1) if non-root and remote port is shell. */ 12485342Simp if (geteuid()) { 12585342Simp struct servent *sp = getservbyname("shell", "tcp"); 12685342Simp 12785342Simp if (sp && sp->s_port == rport) 12885342Simp return (rcmdsh(ahost, rport, locuser, remuser, 12985342Simp cmd, NULL)); 13085342Simp } 13185342Simp 1321573Srgrimes pid = getpid(); 13355918Sshin 13455918Sshin memset(&hints, 0, sizeof(hints)); 13555918Sshin hints.ai_flags = AI_CANONNAME; 13656590Sshin hints.ai_family = af; 13755918Sshin hints.ai_socktype = SOCK_STREAM; 13855918Sshin hints.ai_protocol = 0; 13955918Sshin (void)snprintf(num, sizeof(num), "%d", ntohs(rport)); 14055918Sshin error = getaddrinfo(*ahost, num, &hints, &res); 14155918Sshin if (error) { 14255918Sshin fprintf(stderr, "rcmd: getaddrinfo: %s\n", 14355918Sshin gai_strerror(error)); 14455918Sshin if (error == EAI_SYSTEM) 14555918Sshin fprintf(stderr, "rcmd: getaddrinfo: %s\n", 14655918Sshin strerror(errno)); 1471573Srgrimes return (-1); 1481573Srgrimes } 14963682Sume 15063682Sume if (res->ai_canonname 15163682Sume && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { 15263682Sume strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); 15363682Sume *ahost = canonnamebuf; 15463682Sume } 15569575Sume nres = 0; 15669575Sume for (ai = res; ai; ai = ai->ai_next) 15769575Sume nres++; 15855918Sshin ai = res; 15969575Sume refused = 0; 16071579Sdeischen sigemptyset(&newmask); 16171579Sdeischen sigaddset(&newmask, SIGURG); 16271579Sdeischen _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); 1631573Srgrimes for (timo = 1, lport = IPPORT_RESERVED - 1;;) { 16455918Sshin s = rresvport_af(&lport, ai->ai_family); 1651573Srgrimes if (s < 0) { 16657123Sshin if (errno != EAGAIN && ai->ai_next) { 16757123Sshin ai = ai->ai_next; 16857123Sshin continue; 16957123Sshin } 1701573Srgrimes if (errno == EAGAIN) 1711573Srgrimes (void)fprintf(stderr, 1721573Srgrimes "rcmd: socket: All ports in use\n"); 1731573Srgrimes else 1741573Srgrimes (void)fprintf(stderr, "rcmd: socket: %s\n", 1751573Srgrimes strerror(errno)); 17657123Sshin freeaddrinfo(res); 17771579Sdeischen _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 17871579Sdeischen NULL); 1791573Srgrimes return (-1); 1801573Srgrimes } 18156698Sjasone _fcntl(s, F_SETOWN, pid); 18271579Sdeischen if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) 1831573Srgrimes break; 18456698Sjasone (void)_close(s); 1851573Srgrimes if (errno == EADDRINUSE) { 1861573Srgrimes lport--; 1871573Srgrimes continue; 1881573Srgrimes } 18969575Sume if (errno == ECONNREFUSED) 19069575Sume refused = 1; 19169575Sume if (ai->ai_next == NULL && (!refused || timo > 16)) { 19269575Sume (void)fprintf(stderr, "%s: %s\n", 19369575Sume *ahost, strerror(errno)); 19469575Sume freeaddrinfo(res); 19571579Sdeischen _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 19671579Sdeischen NULL); 19769575Sume return (-1); 19864493Sume } 19969575Sume if (nres > 1) { 2001573Srgrimes int oerrno = errno; 2011573Srgrimes 20255918Sshin getnameinfo(ai->ai_addr, ai->ai_addrlen, 20355918Sshin paddr, sizeof(paddr), 20455918Sshin NULL, 0, 20555918Sshin NI_NUMERICHOST|NI_WITHSCOPEID); 2061573Srgrimes (void)fprintf(stderr, "connect to address %s: ", 20755918Sshin paddr); 2081573Srgrimes errno = oerrno; 2091573Srgrimes perror(0); 21069575Sume } 21169575Sume if ((ai = ai->ai_next) == NULL) { 21269575Sume /* refused && timo <= 16 */ 21369575Sume struct timespec time_to_sleep, time_remaining; 21469575Sume 21569575Sume time_to_sleep.tv_sec = timo; 21669575Sume time_to_sleep.tv_nsec = 0; 21769575Sume (void)_nanosleep(&time_to_sleep, &time_remaining); 21869575Sume timo *= 2; 21969575Sume ai = res; 22069575Sume refused = 0; 22169575Sume } 22269575Sume if (nres > 1) { 22355918Sshin getnameinfo(ai->ai_addr, ai->ai_addrlen, 22455918Sshin paddr, sizeof(paddr), 22555918Sshin NULL, 0, 22655918Sshin NI_NUMERICHOST|NI_WITHSCOPEID); 22755918Sshin fprintf(stderr, "Trying %s...\n", paddr); 2281573Srgrimes } 2291573Srgrimes } 2301573Srgrimes lport--; 2311573Srgrimes if (fd2p == 0) { 23256698Sjasone _write(s, "", 1); 2331573Srgrimes lport = 0; 2341573Srgrimes } else { 2351573Srgrimes char num[8]; 23655918Sshin int s2 = rresvport_af(&lport, ai->ai_family), s3; 23755918Sshin int len = ai->ai_addrlen; 2382592Scsgr int nfds; 2391573Srgrimes 2401573Srgrimes if (s2 < 0) 2411573Srgrimes goto bad; 24271579Sdeischen _listen(s2, 1); 2431573Srgrimes (void)snprintf(num, sizeof(num), "%d", lport); 24456698Sjasone if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 2451573Srgrimes (void)fprintf(stderr, 2461573Srgrimes "rcmd: write (setting up stderr): %s\n", 2471573Srgrimes strerror(errno)); 24856698Sjasone (void)_close(s2); 2491573Srgrimes goto bad; 2501573Srgrimes } 2512592Scsgr nfds = max(s, s2)+1; 2522592Scsgr if(nfds > FD_SETSIZE) { 2532592Scsgr fprintf(stderr, "rcmd: too many files\n"); 25456698Sjasone (void)_close(s2); 2552592Scsgr goto bad; 2562592Scsgr } 25717543Speteragain: 2581573Srgrimes FD_ZERO(&reads); 2591573Srgrimes FD_SET(s, &reads); 2601573Srgrimes FD_SET(s2, &reads); 2611573Srgrimes errno = 0; 26271579Sdeischen if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 2631573Srgrimes if (errno != 0) 2641573Srgrimes (void)fprintf(stderr, 2651573Srgrimes "rcmd: select (setting up stderr): %s\n", 2661573Srgrimes strerror(errno)); 2671573Srgrimes else 2681573Srgrimes (void)fprintf(stderr, 2691573Srgrimes "select: protocol failure in circuit setup\n"); 27056698Sjasone (void)_close(s2); 2711573Srgrimes goto bad; 2721573Srgrimes } 27371579Sdeischen s3 = _accept(s2, (struct sockaddr *)&from, &len); 27455918Sshin switch (from.ss_family) { 27555918Sshin case AF_INET: 27655918Sshin aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 27755918Sshin break; 27855918Sshin#ifdef INET6 27955918Sshin case AF_INET6: 28055918Sshin aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 28155918Sshin break; 28255918Sshin#endif 28355918Sshin default: 28455918Sshin aport = 0; /* error */ 28555918Sshin break; 28655918Sshin } 28717543Speter /* 28817543Speter * XXX careful for ftp bounce attacks. If discovered, shut them 28917543Speter * down and check for the real auxiliary channel to connect. 29017543Speter */ 29155918Sshin if (aport == 20) { 29256698Sjasone _close(s3); 29317543Speter goto again; 29417543Speter } 29556698Sjasone (void)_close(s2); 2961573Srgrimes if (s3 < 0) { 2971573Srgrimes (void)fprintf(stderr, 2981573Srgrimes "rcmd: accept: %s\n", strerror(errno)); 2991573Srgrimes lport = 0; 3001573Srgrimes goto bad; 3011573Srgrimes } 3021573Srgrimes *fd2p = s3; 30355918Sshin if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 3041573Srgrimes (void)fprintf(stderr, 3051573Srgrimes "socket: protocol failure in circuit setup.\n"); 3061573Srgrimes goto bad2; 3071573Srgrimes } 3081573Srgrimes } 30956698Sjasone (void)_write(s, locuser, strlen(locuser)+1); 31056698Sjasone (void)_write(s, remuser, strlen(remuser)+1); 31156698Sjasone (void)_write(s, cmd, strlen(cmd)+1); 31256698Sjasone if (_read(s, &c, 1) != 1) { 3131573Srgrimes (void)fprintf(stderr, 3141573Srgrimes "rcmd: %s: %s\n", *ahost, strerror(errno)); 3151573Srgrimes goto bad2; 3161573Srgrimes } 3171573Srgrimes if (c != 0) { 31856698Sjasone while (_read(s, &c, 1) == 1) { 31956698Sjasone (void)_write(STDERR_FILENO, &c, 1); 3201573Srgrimes if (c == '\n') 3211573Srgrimes break; 3221573Srgrimes } 3231573Srgrimes goto bad2; 3241573Srgrimes } 32571579Sdeischen _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 32655918Sshin freeaddrinfo(res); 3271573Srgrimes return (s); 3281573Srgrimesbad2: 3291573Srgrimes if (lport) 33056698Sjasone (void)_close(*fd2p); 3311573Srgrimesbad: 33256698Sjasone (void)_close(s); 33371579Sdeischen _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 33455918Sshin freeaddrinfo(res); 3351573Srgrimes return (-1); 3361573Srgrimes} 3371573Srgrimes 3381573Srgrimesint 33955918Sshinrresvport(port) 34055918Sshin int *port; 3411573Srgrimes{ 34255918Sshin return rresvport_af(port, AF_INET); 34355918Sshin} 3441573Srgrimes 34555918Sshinint 34655918Sshinrresvport_af(alport, family) 34755918Sshin int *alport, family; 34855918Sshin{ 34955918Sshin int i, s, len, err; 35055918Sshin struct sockaddr_storage ss; 35155918Sshin u_short *sport; 35255918Sshin 35355918Sshin memset(&ss, 0, sizeof(ss)); 35455918Sshin ss.ss_family = family; 35555918Sshin switch (family) { 35655918Sshin case AF_INET: 35755918Sshin ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 35855918Sshin sport = &((struct sockaddr_in *)&ss)->sin_port; 35955918Sshin ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 36055918Sshin break; 36155918Sshin#ifdef INET6 36255918Sshin case AF_INET6: 36355918Sshin ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 36455918Sshin sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 36555918Sshin ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 36655918Sshin break; 36755918Sshin#endif 36855918Sshin default: 36955918Sshin errno = EAFNOSUPPORT; 37055918Sshin return -1; 37155918Sshin } 37255918Sshin 37371579Sdeischen s = _socket(ss.ss_family, SOCK_STREAM, 0); 3741573Srgrimes if (s < 0) 3751573Srgrimes return (-1); 37617543Speter#if 0 /* compat_exact_traditional_rresvport_semantics */ 37717543Speter sin.sin_port = htons((u_short)*alport); 37871579Sdeischen if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 37917543Speter return (s); 38017543Speter if (errno != EADDRINUSE) { 38156698Sjasone (void)_close(s); 38217543Speter return (-1); 38316034Speter } 38417543Speter#endif 38555918Sshin *sport = 0; 38656636Sshin if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 38756698Sjasone (void)_close(s); 38817543Speter return (-1); 3891573Srgrimes } 39055918Sshin *alport = (int)ntohs(*sport); 39117543Speter return (s); 3921573Srgrimes} 3931573Srgrimes 3941573Srgrimesint __check_rhosts_file = 1; 3951573Srgrimeschar *__rcmd_errstr; 3961573Srgrimes 3971573Srgrimesint 3981573Srgrimesruserok(rhost, superuser, ruser, luser) 3991573Srgrimes const char *rhost, *ruser, *luser; 4001573Srgrimes int superuser; 4011573Srgrimes{ 40256939Sshin struct addrinfo hints, *res, *r; 40356939Sshin int error; 40455918Sshin 40556939Sshin memset(&hints, 0, sizeof(hints)); 40656939Sshin hints.ai_family = PF_UNSPEC; 40756939Sshin hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 40856939Sshin error = getaddrinfo(rhost, "0", &hints, &res); 40956939Sshin if (error) 41056939Sshin return (-1); 4111573Srgrimes 41256939Sshin for (r = res; r; r = r->ai_next) { 41356939Sshin if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 41456939Sshin luser) == 0) { 41556939Sshin freeaddrinfo(res); 41656939Sshin return (0); 41755918Sshin } 4181573Srgrimes } 41956939Sshin freeaddrinfo(res); 42056939Sshin return (-1); 4211573Srgrimes} 4221573Srgrimes 4231573Srgrimes/* 4241573Srgrimes * New .rhosts strategy: We are passed an ip address. We spin through 4251573Srgrimes * hosts.equiv and .rhosts looking for a match. When the .rhosts only 4261573Srgrimes * has ip addresses, we don't have to trust a nameserver. When it 4271573Srgrimes * contains hostnames, we spin through the list of addresses the nameserver 4281573Srgrimes * gives us and look for a match. 4291573Srgrimes * 4301573Srgrimes * Returns 0 if ok, -1 if not ok. 4311573Srgrimes */ 4321573Srgrimesint 4331573Srgrimesiruserok(raddr, superuser, ruser, luser) 43439979Sdfr unsigned long raddr; 4351573Srgrimes int superuser; 4361573Srgrimes const char *ruser, *luser; 4371573Srgrimes{ 43869575Sume struct sockaddr_in sin; 43969575Sume 44069575Sume memset(&sin, 0, sizeof(sin)); 44169575Sume sin.sin_family = AF_INET; 44269575Sume sin.sin_len = sizeof(struct sockaddr_in); 44369575Sume memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 44469575Sume return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser, 44569575Sume ruser, luser); 44655918Sshin} 44755918Sshin 44869575Sume/* 44969575Sume * AF independent extension of iruserok. 45069575Sume * 45169575Sume * Returns 0 if ok, -1 if not ok. 45269575Sume */ 45369575Sumeint 45469575Sumeiruserok_sa(ra, rlen, superuser, ruser, luser) 45569575Sume const void *ra; 45669575Sume int rlen; 45755918Sshin int superuser; 45855918Sshin const char *ruser, *luser; 45955918Sshin{ 46092889Sobrien char *cp; 4611573Srgrimes struct stat sbuf; 4621573Srgrimes struct passwd *pwd; 4631573Srgrimes FILE *hostf; 4641573Srgrimes uid_t uid; 4651573Srgrimes int first; 4661573Srgrimes char pbuf[MAXPATHLEN]; 46769575Sume const struct sockaddr *raddr; 46869575Sume struct sockaddr_storage ss; 4691573Srgrimes 47069575Sume /* avoid alignment issue */ 47169575Sume if (rlen > sizeof(ss)) 47269575Sume return(-1); 47369575Sume memcpy(&ss, ra, rlen); 47469575Sume raddr = (struct sockaddr *)&ss; 47555918Sshin 4761573Srgrimes first = 1; 4771573Srgrimes hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); 4781573Srgrimesagain: 4791573Srgrimes if (hostf) { 48069575Sume if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 4811573Srgrimes (void)fclose(hostf); 4821573Srgrimes return (0); 4831573Srgrimes } 4841573Srgrimes (void)fclose(hostf); 4851573Srgrimes } 4861573Srgrimes if (first == 1 && (__check_rhosts_file || superuser)) { 4871573Srgrimes first = 0; 4881573Srgrimes if ((pwd = getpwnam(luser)) == NULL) 4891573Srgrimes return (-1); 4901573Srgrimes (void)strcpy(pbuf, pwd->pw_dir); 4911573Srgrimes (void)strcat(pbuf, "/.rhosts"); 4921573Srgrimes 4931573Srgrimes /* 4941573Srgrimes * Change effective uid while opening .rhosts. If root and 4951573Srgrimes * reading an NFS mounted file system, can't read files that 4961573Srgrimes * are protected read/write owner only. 4971573Srgrimes */ 4981573Srgrimes uid = geteuid(); 4991573Srgrimes (void)seteuid(pwd->pw_uid); 5001573Srgrimes hostf = fopen(pbuf, "r"); 5011573Srgrimes (void)seteuid(uid); 5021573Srgrimes 5031573Srgrimes if (hostf == NULL) 5041573Srgrimes return (-1); 5051573Srgrimes /* 5061573Srgrimes * If not a regular file, or is owned by someone other than 5071573Srgrimes * user or root or if writeable by anyone but the owner, quit. 5081573Srgrimes */ 5091573Srgrimes cp = NULL; 5101573Srgrimes if (lstat(pbuf, &sbuf) < 0) 5111573Srgrimes cp = ".rhosts lstat failed"; 5121573Srgrimes else if (!S_ISREG(sbuf.st_mode)) 5131573Srgrimes cp = ".rhosts not regular file"; 51471579Sdeischen else if (_fstat(fileno(hostf), &sbuf) < 0) 5151573Srgrimes cp = ".rhosts fstat failed"; 5161573Srgrimes else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) 5171573Srgrimes cp = "bad .rhosts owner"; 5181573Srgrimes else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) 5191573Srgrimes cp = ".rhosts writeable by other than owner"; 5201573Srgrimes /* If there were any problems, quit. */ 5211573Srgrimes if (cp) { 5221573Srgrimes __rcmd_errstr = cp; 5231573Srgrimes (void)fclose(hostf); 5241573Srgrimes return (-1); 5251573Srgrimes } 5261573Srgrimes goto again; 5271573Srgrimes } 5281573Srgrimes return (-1); 5291573Srgrimes} 5301573Srgrimes 5311573Srgrimes/* 53269575Sume * XXX 53369575Sume * Don't make static, used by lpd(8). 53456939Sshin * 53556939Sshin * Returns 0 if ok, -1 if not ok. 53656939Sshin */ 53756939Sshinint 53869575Sume__ivaliduser(hostf, raddr, luser, ruser) 53969575Sume FILE *hostf; 54069575Sume u_int32_t raddr; 54169575Sume const char *luser, *ruser; 54256939Sshin{ 54369575Sume struct sockaddr_in sin; 54456939Sshin 54569575Sume memset(&sin, 0, sizeof(sin)); 54669575Sume sin.sin_family = AF_INET; 54769575Sume sin.sin_len = sizeof(struct sockaddr_in); 54869575Sume memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 54969575Sume return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len, 55069575Sume luser, ruser); 55169575Sume} 55269575Sume 55369575Sume/* 55469575Sume * Returns 0 if ok, -1 if not ok. 55569575Sume * 55669575Sume * XXX obsolete API. 55769575Sume */ 55869575Sumeint 55969575Sume__ivaliduser_af(hostf, raddr, luser, ruser, af, len) 56069575Sume FILE *hostf; 56169575Sume const void *raddr; 56269575Sume const char *luser, *ruser; 56369575Sume int af, len; 56469575Sume{ 56569575Sume struct sockaddr *sa = NULL; 56669575Sume struct sockaddr_in *sin = NULL; 56769575Sume#ifdef INET6 56869575Sume struct sockaddr_in6 *sin6 = NULL; 56969575Sume#endif 57069575Sume struct sockaddr_storage ss; 57169575Sume 57269575Sume memset(&ss, 0, sizeof(ss)); 57369575Sume switch (af) { 57456939Sshin case AF_INET: 57569575Sume if (len != sizeof(sin->sin_addr)) 57669575Sume return -1; 57769575Sume sin = (struct sockaddr_in *)&ss; 57869575Sume sin->sin_family = AF_INET; 57969575Sume sin->sin_len = sizeof(struct sockaddr_in); 58069575Sume memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); 58156939Sshin break; 58256939Sshin#ifdef INET6 58356939Sshin case AF_INET6: 58469575Sume if (len != sizeof(sin6->sin6_addr)) 58569575Sume return -1; 58669575Sume /* you will lose scope info */ 58769575Sume sin6 = (struct sockaddr_in6 *)&ss; 58869575Sume sin6->sin6_family = AF_INET6; 58969575Sume sin6->sin6_len = sizeof(struct sockaddr_in6); 59069575Sume memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); 59156939Sshin break; 59256939Sshin#endif 59369575Sume default: 59469575Sume return -1; 59556939Sshin } 59656939Sshin 59769575Sume sa = (struct sockaddr *)&ss; 59869575Sume return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser); 59956939Sshin} 60056939Sshin 6011573Srgrimesint 60269575Sume__ivaliduser_sa(hostf, raddr, salen, luser, ruser) 6031573Srgrimes FILE *hostf; 60469575Sume const struct sockaddr *raddr; 60569575Sume socklen_t salen; 6061573Srgrimes const char *luser, *ruser; 6071573Srgrimes{ 60892889Sobrien char *user, *p; 6091573Srgrimes int ch; 6101573Srgrimes char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 61110059Swpaul char hname[MAXHOSTNAMELEN]; 6127183Swpaul /* Presumed guilty until proven innocent. */ 6137183Swpaul int userok = 0, hostok = 0; 61455918Sshin int h_error; 6159978Swpaul#ifdef YP 6169978Swpaul char *ypdomain; 6171573Srgrimes 6189978Swpaul if (yp_get_default_domain(&ypdomain)) 6199978Swpaul ypdomain = NULL; 6209978Swpaul#else 6219978Swpaul#define ypdomain NULL 6229978Swpaul#endif 6237183Swpaul /* We need to get the damn hostname back for netgroup matching. */ 62469575Sume if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, 62569575Sume NI_NAMEREQD) != 0) 6267183Swpaul return (-1); 6277183Swpaul 6281573Srgrimes while (fgets(buf, sizeof(buf), hostf)) { 6291573Srgrimes p = buf; 6301573Srgrimes /* Skip lines that are too long. */ 63158154Sbsd if (strchr(p, '\n') == NULL) { 6321573Srgrimes while ((ch = getc(hostf)) != '\n' && ch != EOF); 6331573Srgrimes continue; 6341573Srgrimes } 6359552Speter if (*p == '\n' || *p == '#') { 6369552Speter /* comment... */ 6379552Speter continue; 6389552Speter } 6391573Srgrimes while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 64052859Sache *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 6411573Srgrimes p++; 6421573Srgrimes } 6431573Srgrimes if (*p == ' ' || *p == '\t') { 6441573Srgrimes *p++ = '\0'; 6451573Srgrimes while (*p == ' ' || *p == '\t') 6461573Srgrimes p++; 6471573Srgrimes user = p; 6481573Srgrimes while (*p != '\n' && *p != ' ' && 6491573Srgrimes *p != '\t' && *p != '\0') 6501573Srgrimes p++; 6511573Srgrimes } else 6521573Srgrimes user = p; 6531573Srgrimes *p = '\0'; 6547183Swpaul /* 6557183Swpaul * Do +/- and +@/-@ checking. This looks really nasty, 6567183Swpaul * but it matches SunOS's behavior so far as I can tell. 6577183Swpaul */ 6587183Swpaul switch(buf[0]) { 6597183Swpaul case '+': 6607183Swpaul if (!buf[1]) { /* '+' matches all hosts */ 6617183Swpaul hostok = 1; 6627183Swpaul break; 6637183Swpaul } 6647183Swpaul if (buf[1] == '@') /* match a host by netgroup */ 66510059Swpaul hostok = innetgr((char *)&buf[2], 66610059Swpaul (char *)&hname, NULL, ypdomain); 6677183Swpaul else /* match a host by addr */ 66869575Sume hostok = __icheckhost(raddr, salen, 66969575Sume (char *)&buf[1]); 6707183Swpaul break; 6717183Swpaul case '-': /* reject '-' hosts and all their users */ 6727183Swpaul if (buf[1] == '@') { 6737183Swpaul if (innetgr((char *)&buf[2], 67410059Swpaul (char *)&hname, NULL, ypdomain)) 6757183Swpaul return(-1); 6767183Swpaul } else { 67769575Sume if (__icheckhost(raddr, salen, 67869575Sume (char *)&buf[1])) 6797183Swpaul return(-1); 6807183Swpaul } 6817183Swpaul break; 6827183Swpaul default: /* if no '+' or '-', do a simple match */ 68369575Sume hostok = __icheckhost(raddr, salen, buf); 6847183Swpaul break; 6851573Srgrimes } 6867183Swpaul switch(*user) { 6877183Swpaul case '+': 6887183Swpaul if (!*(user+1)) { /* '+' matches all users */ 6897183Swpaul userok = 1; 6907183Swpaul break; 6917183Swpaul } 6927183Swpaul if (*(user+1) == '@') /* match a user by netgroup */ 6939978Swpaul userok = innetgr(user+2, NULL, ruser, ypdomain); 6947183Swpaul else /* match a user by direct specification */ 6957183Swpaul userok = !(strcmp(ruser, user+1)); 6967183Swpaul break; 6977183Swpaul case '-': /* if we matched a hostname, */ 6987183Swpaul if (hostok) { /* check for user field rejections */ 6997183Swpaul if (!*(user+1)) 7007183Swpaul return(-1); 7017183Swpaul if (*(user+1) == '@') { 7027183Swpaul if (innetgr(user+2, NULL, 7039978Swpaul ruser, ypdomain)) 7047183Swpaul return(-1); 7057183Swpaul } else { 7067183Swpaul if (!strcmp(ruser, user+1)) 7077183Swpaul return(-1); 7087183Swpaul } 7097183Swpaul } 7107183Swpaul break; 7117183Swpaul default: /* no rejections: try to match the user */ 7127183Swpaul if (hostok) 7137183Swpaul userok = !(strcmp(ruser,*user ? user : luser)); 7147183Swpaul break; 7157183Swpaul } 7167183Swpaul if (hostok && userok) 7177183Swpaul return(0); 7181573Srgrimes } 7191573Srgrimes return (-1); 7201573Srgrimes} 7211573Srgrimes 7221573Srgrimes/* 7231573Srgrimes * Returns "true" if match, 0 if no match. 72469575Sume * 72569575Sume * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion 72669575Sume * if af == AF_INET6. 7271573Srgrimes */ 7281573Srgrimesstatic int 72969575Sume__icheckhost(raddr, salen, lhost) 73069575Sume const struct sockaddr *raddr; 73169575Sume socklen_t salen; 73269575Sume const char *lhost; 7331573Srgrimes{ 73469575Sume struct sockaddr_in sin; 73569575Sume struct sockaddr_in6 *sin6; 73669575Sume struct addrinfo hints, *res, *r; 73769575Sume int error; 73869575Sume char h1[NI_MAXHOST], h2[NI_MAXHOST]; 7391573Srgrimes 74069575Sume if (raddr->sa_family == AF_INET6) { 74169575Sume sin6 = (struct sockaddr_in6 *)raddr; 74269575Sume if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 74369575Sume memset(&sin, 0, sizeof(sin)); 74469575Sume sin.sin_family = AF_INET; 74569575Sume sin.sin_len = sizeof(struct sockaddr_in); 74669575Sume memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 74769575Sume sizeof(sin.sin_addr)); 74869575Sume raddr = (struct sockaddr *)&sin; 74969575Sume salen = sin.sin_len; 75069575Sume } 75155918Sshin } 7521573Srgrimes 75369575Sume h1[0] = '\0'; 75469575Sume if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, 75569575Sume NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 7561573Srgrimes return (0); 7571573Srgrimes 75869575Sume /* Resolve laddr into sockaddr */ 75969575Sume memset(&hints, 0, sizeof(hints)); 76069575Sume hints.ai_family = raddr->sa_family; 76169575Sume hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ 76269575Sume res = NULL; 76369575Sume error = getaddrinfo(lhost, "0", &hints, &res); 76469575Sume if (error) 76569575Sume return (0); 76669575Sume 76769575Sume for (r = res; r ; r = r->ai_next) { 76869575Sume h2[0] = '\0'; 76969575Sume if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), 77069575Sume NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 77169575Sume continue; 77269575Sume if (strcmp(h1, h2) == 0) { 77369575Sume freeaddrinfo(res); 77469575Sume return (1); 77555918Sshin } 77669575Sume } 7771573Srgrimes 77869575Sume /* No match. */ 77969575Sume freeaddrinfo(res); 78069575Sume return (0); 7811573Srgrimes} 782