rcmd.c revision 63682
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 63682 2000-07-20 18:49:35Z ume $ 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 401573Srgrimes#include <sys/param.h> 411573Srgrimes#include <sys/socket.h> 421573Srgrimes#include <sys/stat.h> 431573Srgrimes 441573Srgrimes#include <netinet/in.h> 451573Srgrimes#include <arpa/inet.h> 461573Srgrimes 471573Srgrimes#include <signal.h> 481573Srgrimes#include <fcntl.h> 491573Srgrimes#include <netdb.h> 501573Srgrimes#include <unistd.h> 511573Srgrimes#include <pwd.h> 521573Srgrimes#include <errno.h> 531573Srgrimes#include <stdio.h> 541573Srgrimes#include <ctype.h> 551573Srgrimes#include <string.h> 569978Swpaul#ifdef YP 579978Swpaul#include <rpc/rpc.h> 589978Swpaul#include <rpcsvc/yp_prot.h> 599978Swpaul#include <rpcsvc/ypclnt.h> 609978Swpaul#endif 6163682Sume#include <arpa/nameser.h> 621573Srgrimes 6355918Sshin/* wrapper for KAME-special getnameinfo() */ 6455918Sshin#ifndef NI_WITHSCOPEID 6555918Sshin#define NI_WITHSCOPEID 0 6655918Sshin#endif 6755918Sshin 6817141Sjkhextern int innetgr __P(( const char *, const char *, const char *, const char * )); 6917141Sjkh 702592Scsgr#define max(a, b) ((a > b) ? a : b) 712592Scsgr 7256939Sshinstatic int __iruserok_af __P((void *, int, const char *, const char *, int)); 7339979Sdfrint __ivaliduser __P((FILE *, u_int32_t, const char *, const char *)); 7455918Sshinstatic int __icheckhost __P((void *, char *, int, int)); 751573Srgrimes 7655918Sshinchar paddr[INET6_ADDRSTRLEN]; 7755918Sshin 781573Srgrimesint 791573Srgrimesrcmd(ahost, rport, locuser, remuser, cmd, fd2p) 801573Srgrimes char **ahost; 811573Srgrimes u_short rport; 821573Srgrimes const char *locuser, *remuser, *cmd; 831573Srgrimes int *fd2p; 841573Srgrimes{ 8556590Sshin return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 8656590Sshin} 8756590Sshin 8856590Sshinint 8956590Sshinrcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af) 9056590Sshin char **ahost; 9156590Sshin u_short rport; 9256590Sshin const char *locuser, *remuser, *cmd; 9356590Sshin int *fd2p; 9456590Sshin int af; 9556590Sshin{ 9655918Sshin struct addrinfo hints, *res, *ai; 9755918Sshin struct sockaddr_storage from; 981573Srgrimes fd_set reads; 991573Srgrimes long oldmask; 1001573Srgrimes pid_t pid; 10155918Sshin int s, aport, lport, timo, error; 1021573Srgrimes char c; 10355918Sshin int refused; 10463682Sume char num[8]; 10563682Sume static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 1061573Srgrimes 1071573Srgrimes pid = getpid(); 10855918Sshin 10955918Sshin memset(&hints, 0, sizeof(hints)); 11055918Sshin hints.ai_flags = AI_CANONNAME; 11156590Sshin hints.ai_family = af; 11255918Sshin hints.ai_socktype = SOCK_STREAM; 11355918Sshin hints.ai_protocol = 0; 11455918Sshin (void)snprintf(num, sizeof(num), "%d", ntohs(rport)); 11555918Sshin error = getaddrinfo(*ahost, num, &hints, &res); 11655918Sshin if (error) { 11755918Sshin fprintf(stderr, "rcmd: getaddrinfo: %s\n", 11855918Sshin gai_strerror(error)); 11955918Sshin if (error == EAI_SYSTEM) 12055918Sshin fprintf(stderr, "rcmd: getaddrinfo: %s\n", 12155918Sshin strerror(errno)); 1221573Srgrimes return (-1); 1231573Srgrimes } 12463682Sume 12563682Sume if (res->ai_canonname 12663682Sume && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { 12763682Sume strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); 12863682Sume *ahost = canonnamebuf; 12963682Sume } 13055918Sshin ai = res; 13155918Sshin refused = 0; 1321573Srgrimes oldmask = sigblock(sigmask(SIGURG)); 1331573Srgrimes for (timo = 1, lport = IPPORT_RESERVED - 1;;) { 13455918Sshin s = rresvport_af(&lport, ai->ai_family); 1351573Srgrimes if (s < 0) { 13657123Sshin if (errno != EAGAIN && ai->ai_next) { 13757123Sshin ai = ai->ai_next; 13857123Sshin continue; 13957123Sshin } 1401573Srgrimes if (errno == EAGAIN) 1411573Srgrimes (void)fprintf(stderr, 1421573Srgrimes "rcmd: socket: All ports in use\n"); 1431573Srgrimes else 1441573Srgrimes (void)fprintf(stderr, "rcmd: socket: %s\n", 1451573Srgrimes strerror(errno)); 14657123Sshin freeaddrinfo(res); 1471573Srgrimes sigsetmask(oldmask); 1481573Srgrimes return (-1); 1491573Srgrimes } 15056698Sjasone _fcntl(s, F_SETOWN, pid); 15155918Sshin if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) 1521573Srgrimes break; 15356698Sjasone (void)_close(s); 1541573Srgrimes if (errno == EADDRINUSE) { 1551573Srgrimes lport--; 1561573Srgrimes continue; 1571573Srgrimes } 15855918Sshin if (errno == ECONNREFUSED) 15955918Sshin refused = 1; 16055918Sshin if (ai->ai_next != NULL) { 1611573Srgrimes int oerrno = errno; 1621573Srgrimes 16355918Sshin getnameinfo(ai->ai_addr, ai->ai_addrlen, 16455918Sshin paddr, sizeof(paddr), 16555918Sshin NULL, 0, 16655918Sshin NI_NUMERICHOST|NI_WITHSCOPEID); 1671573Srgrimes (void)fprintf(stderr, "connect to address %s: ", 16855918Sshin paddr); 1691573Srgrimes errno = oerrno; 1701573Srgrimes perror(0); 17155918Sshin ai = ai->ai_next; 17255918Sshin getnameinfo(ai->ai_addr, ai->ai_addrlen, 17355918Sshin paddr, sizeof(paddr), 17455918Sshin NULL, 0, 17555918Sshin NI_NUMERICHOST|NI_WITHSCOPEID); 17655918Sshin fprintf(stderr, "Trying %s...\n", paddr); 1771573Srgrimes continue; 1781573Srgrimes } 17955918Sshin if (refused && timo <= 16) { 18056698Sjasone struct timespec time_to_sleep, time_remaining; 18156698Sjasone 18256698Sjasone time_to_sleep.tv_sec = timo; 18356698Sjasone time_to_sleep.tv_nsec = 0; 18456698Sjasone (void)_nanosleep(&time_to_sleep, &time_remaining); 18556698Sjasone 18655918Sshin timo *= 2; 18755918Sshin ai = res; 18855918Sshin refused = 0; 18955918Sshin continue; 19055918Sshin } 19162939Speter (void)fprintf(stderr, "%s: %s\n", *ahost, strerror(errno)); 19255918Sshin freeaddrinfo(res); 1931573Srgrimes sigsetmask(oldmask); 1941573Srgrimes return (-1); 1951573Srgrimes } 1961573Srgrimes lport--; 1971573Srgrimes if (fd2p == 0) { 19856698Sjasone _write(s, "", 1); 1991573Srgrimes lport = 0; 2001573Srgrimes } else { 2011573Srgrimes char num[8]; 20255918Sshin int s2 = rresvport_af(&lport, ai->ai_family), s3; 20355918Sshin int len = ai->ai_addrlen; 2042592Scsgr int nfds; 2051573Srgrimes 2061573Srgrimes if (s2 < 0) 2071573Srgrimes goto bad; 2081573Srgrimes listen(s2, 1); 2091573Srgrimes (void)snprintf(num, sizeof(num), "%d", lport); 21056698Sjasone if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 2111573Srgrimes (void)fprintf(stderr, 2121573Srgrimes "rcmd: write (setting up stderr): %s\n", 2131573Srgrimes strerror(errno)); 21456698Sjasone (void)_close(s2); 2151573Srgrimes goto bad; 2161573Srgrimes } 2172592Scsgr nfds = max(s, s2)+1; 2182592Scsgr if(nfds > FD_SETSIZE) { 2192592Scsgr fprintf(stderr, "rcmd: too many files\n"); 22056698Sjasone (void)_close(s2); 2212592Scsgr goto bad; 2222592Scsgr } 22317543Speteragain: 2241573Srgrimes FD_ZERO(&reads); 2251573Srgrimes FD_SET(s, &reads); 2261573Srgrimes FD_SET(s2, &reads); 2271573Srgrimes errno = 0; 2282592Scsgr if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 2291573Srgrimes if (errno != 0) 2301573Srgrimes (void)fprintf(stderr, 2311573Srgrimes "rcmd: select (setting up stderr): %s\n", 2321573Srgrimes strerror(errno)); 2331573Srgrimes else 2341573Srgrimes (void)fprintf(stderr, 2351573Srgrimes "select: protocol failure in circuit setup\n"); 23656698Sjasone (void)_close(s2); 2371573Srgrimes goto bad; 2381573Srgrimes } 2391573Srgrimes s3 = accept(s2, (struct sockaddr *)&from, &len); 24055918Sshin switch (from.ss_family) { 24155918Sshin case AF_INET: 24255918Sshin aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 24355918Sshin break; 24455918Sshin#ifdef INET6 24555918Sshin case AF_INET6: 24655918Sshin aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 24755918Sshin break; 24855918Sshin#endif 24955918Sshin default: 25055918Sshin aport = 0; /* error */ 25155918Sshin break; 25255918Sshin } 25317543Speter /* 25417543Speter * XXX careful for ftp bounce attacks. If discovered, shut them 25517543Speter * down and check for the real auxiliary channel to connect. 25617543Speter */ 25755918Sshin if (aport == 20) { 25856698Sjasone _close(s3); 25917543Speter goto again; 26017543Speter } 26156698Sjasone (void)_close(s2); 2621573Srgrimes if (s3 < 0) { 2631573Srgrimes (void)fprintf(stderr, 2641573Srgrimes "rcmd: accept: %s\n", strerror(errno)); 2651573Srgrimes lport = 0; 2661573Srgrimes goto bad; 2671573Srgrimes } 2681573Srgrimes *fd2p = s3; 26955918Sshin if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 2701573Srgrimes (void)fprintf(stderr, 2711573Srgrimes "socket: protocol failure in circuit setup.\n"); 2721573Srgrimes goto bad2; 2731573Srgrimes } 2741573Srgrimes } 27556698Sjasone (void)_write(s, locuser, strlen(locuser)+1); 27656698Sjasone (void)_write(s, remuser, strlen(remuser)+1); 27756698Sjasone (void)_write(s, cmd, strlen(cmd)+1); 27856698Sjasone if (_read(s, &c, 1) != 1) { 2791573Srgrimes (void)fprintf(stderr, 2801573Srgrimes "rcmd: %s: %s\n", *ahost, strerror(errno)); 2811573Srgrimes goto bad2; 2821573Srgrimes } 2831573Srgrimes if (c != 0) { 28456698Sjasone while (_read(s, &c, 1) == 1) { 28556698Sjasone (void)_write(STDERR_FILENO, &c, 1); 2861573Srgrimes if (c == '\n') 2871573Srgrimes break; 2881573Srgrimes } 2891573Srgrimes goto bad2; 2901573Srgrimes } 2911573Srgrimes sigsetmask(oldmask); 29255918Sshin freeaddrinfo(res); 2931573Srgrimes return (s); 2941573Srgrimesbad2: 2951573Srgrimes if (lport) 29656698Sjasone (void)_close(*fd2p); 2971573Srgrimesbad: 29856698Sjasone (void)_close(s); 2991573Srgrimes sigsetmask(oldmask); 30055918Sshin freeaddrinfo(res); 3011573Srgrimes return (-1); 3021573Srgrimes} 3031573Srgrimes 3041573Srgrimesint 30555918Sshinrresvport(port) 30655918Sshin int *port; 3071573Srgrimes{ 30855918Sshin return rresvport_af(port, AF_INET); 30955918Sshin} 3101573Srgrimes 31155918Sshinint 31255918Sshinrresvport_af(alport, family) 31355918Sshin int *alport, family; 31455918Sshin{ 31555918Sshin int i, s, len, err; 31655918Sshin struct sockaddr_storage ss; 31755918Sshin u_short *sport; 31855918Sshin 31955918Sshin memset(&ss, 0, sizeof(ss)); 32055918Sshin ss.ss_family = family; 32155918Sshin switch (family) { 32255918Sshin case AF_INET: 32355918Sshin ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 32455918Sshin sport = &((struct sockaddr_in *)&ss)->sin_port; 32555918Sshin ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 32655918Sshin break; 32755918Sshin#ifdef INET6 32855918Sshin case AF_INET6: 32955918Sshin ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 33055918Sshin sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 33155918Sshin ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 33255918Sshin break; 33355918Sshin#endif 33455918Sshin default: 33555918Sshin errno = EAFNOSUPPORT; 33655918Sshin return -1; 33755918Sshin } 33855918Sshin 33955918Sshin s = socket(ss.ss_family, SOCK_STREAM, 0); 3401573Srgrimes if (s < 0) 3411573Srgrimes return (-1); 34217543Speter#if 0 /* compat_exact_traditional_rresvport_semantics */ 34317543Speter sin.sin_port = htons((u_short)*alport); 34417543Speter if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 34517543Speter return (s); 34617543Speter if (errno != EADDRINUSE) { 34756698Sjasone (void)_close(s); 34817543Speter return (-1); 34916034Speter } 35017543Speter#endif 35155918Sshin *sport = 0; 35256636Sshin if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 35356698Sjasone (void)_close(s); 35417543Speter return (-1); 3551573Srgrimes } 35655918Sshin *alport = (int)ntohs(*sport); 35717543Speter return (s); 3581573Srgrimes} 3591573Srgrimes 3601573Srgrimesint __check_rhosts_file = 1; 3611573Srgrimeschar *__rcmd_errstr; 3621573Srgrimes 3631573Srgrimesint 3641573Srgrimesruserok(rhost, superuser, ruser, luser) 3651573Srgrimes const char *rhost, *ruser, *luser; 3661573Srgrimes int superuser; 3671573Srgrimes{ 36856939Sshin struct addrinfo hints, *res, *r; 36956939Sshin int error; 37055918Sshin 37156939Sshin memset(&hints, 0, sizeof(hints)); 37256939Sshin hints.ai_family = PF_UNSPEC; 37356939Sshin hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 37456939Sshin error = getaddrinfo(rhost, "0", &hints, &res); 37556939Sshin if (error) 37656939Sshin return (-1); 3771573Srgrimes 37856939Sshin for (r = res; r; r = r->ai_next) { 37956939Sshin if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 38056939Sshin luser) == 0) { 38156939Sshin freeaddrinfo(res); 38256939Sshin return (0); 38355918Sshin } 3841573Srgrimes } 38556939Sshin freeaddrinfo(res); 38656939Sshin return (-1); 3871573Srgrimes} 3881573Srgrimes 3891573Srgrimes/* 3901573Srgrimes * New .rhosts strategy: We are passed an ip address. We spin through 3911573Srgrimes * hosts.equiv and .rhosts looking for a match. When the .rhosts only 3921573Srgrimes * has ip addresses, we don't have to trust a nameserver. When it 3931573Srgrimes * contains hostnames, we spin through the list of addresses the nameserver 3941573Srgrimes * gives us and look for a match. 3951573Srgrimes * 3961573Srgrimes * Returns 0 if ok, -1 if not ok. 3971573Srgrimes */ 3981573Srgrimesint 3991573Srgrimesiruserok(raddr, superuser, ruser, luser) 40039979Sdfr unsigned long raddr; 4011573Srgrimes int superuser; 4021573Srgrimes const char *ruser, *luser; 4031573Srgrimes{ 40456939Sshin return __iruserok_af(&raddr, superuser, ruser, luser, AF_INET); 40555918Sshin} 40655918Sshin 40756939Sshin/* Other AF support extension of iruserok. */ 40856939Sshinstatic int 40956939Sshin__iruserok_af(raddr, superuser, ruser, luser, af) 41055918Sshin void *raddr; 41155918Sshin int superuser; 41255918Sshin const char *ruser, *luser; 41355918Sshin int af; 41455918Sshin{ 4151573Srgrimes register char *cp; 4161573Srgrimes struct stat sbuf; 4171573Srgrimes struct passwd *pwd; 4181573Srgrimes FILE *hostf; 4191573Srgrimes uid_t uid; 4201573Srgrimes int first; 4211573Srgrimes char pbuf[MAXPATHLEN]; 42255918Sshin int len = 0; 4231573Srgrimes 42455918Sshin switch (af) { 42555918Sshin case AF_INET: 42655918Sshin len = sizeof(struct in_addr); 42755918Sshin break; 42855918Sshin#ifdef INET6 42955918Sshin case AF_INET6: 43055918Sshin len = sizeof(struct in6_addr); 43155918Sshin break; 43255918Sshin#endif 43355918Sshin } 43455918Sshin 4351573Srgrimes first = 1; 4361573Srgrimes hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); 4371573Srgrimesagain: 4381573Srgrimes if (hostf) { 43955918Sshin if (__ivaliduser_af(hostf, raddr, luser, ruser, af, len) 44055918Sshin == 0) { 4411573Srgrimes (void)fclose(hostf); 4421573Srgrimes return (0); 4431573Srgrimes } 4441573Srgrimes (void)fclose(hostf); 4451573Srgrimes } 4461573Srgrimes if (first == 1 && (__check_rhosts_file || superuser)) { 4471573Srgrimes first = 0; 4481573Srgrimes if ((pwd = getpwnam(luser)) == NULL) 4491573Srgrimes return (-1); 4501573Srgrimes (void)strcpy(pbuf, pwd->pw_dir); 4511573Srgrimes (void)strcat(pbuf, "/.rhosts"); 4521573Srgrimes 4531573Srgrimes /* 4541573Srgrimes * Change effective uid while opening .rhosts. If root and 4551573Srgrimes * reading an NFS mounted file system, can't read files that 4561573Srgrimes * are protected read/write owner only. 4571573Srgrimes */ 4581573Srgrimes uid = geteuid(); 4591573Srgrimes (void)seteuid(pwd->pw_uid); 4601573Srgrimes hostf = fopen(pbuf, "r"); 4611573Srgrimes (void)seteuid(uid); 4621573Srgrimes 4631573Srgrimes if (hostf == NULL) 4641573Srgrimes return (-1); 4651573Srgrimes /* 4661573Srgrimes * If not a regular file, or is owned by someone other than 4671573Srgrimes * user or root or if writeable by anyone but the owner, quit. 4681573Srgrimes */ 4691573Srgrimes cp = NULL; 4701573Srgrimes if (lstat(pbuf, &sbuf) < 0) 4711573Srgrimes cp = ".rhosts lstat failed"; 4721573Srgrimes else if (!S_ISREG(sbuf.st_mode)) 4731573Srgrimes cp = ".rhosts not regular file"; 4741573Srgrimes else if (fstat(fileno(hostf), &sbuf) < 0) 4751573Srgrimes cp = ".rhosts fstat failed"; 4761573Srgrimes else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) 4771573Srgrimes cp = "bad .rhosts owner"; 4781573Srgrimes else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) 4791573Srgrimes cp = ".rhosts writeable by other than owner"; 4801573Srgrimes /* If there were any problems, quit. */ 4811573Srgrimes if (cp) { 4821573Srgrimes __rcmd_errstr = cp; 4831573Srgrimes (void)fclose(hostf); 4841573Srgrimes return (-1); 4851573Srgrimes } 4861573Srgrimes goto again; 4871573Srgrimes } 4881573Srgrimes return (-1); 4891573Srgrimes} 4901573Srgrimes 4911573Srgrimes/* 49256939Sshin * AF independent extension of iruserok. We are passed an sockaddr, and 49356939Sshin * then call iruserok_af() as the type of sockaddr. 49456939Sshin * 49556939Sshin * Returns 0 if ok, -1 if not ok. 49656939Sshin */ 49756939Sshinint 49856939Sshiniruserok_sa(addr, addrlen, superuser, ruser, luser) 49956939Sshin const void *addr; 50056939Sshin int addrlen; 50156939Sshin int superuser; 50256939Sshin const char *ruser, *luser; 50356939Sshin{ 50456939Sshin struct sockaddr *sa; 50556939Sshin void *raddr = NULL; 50656939Sshin 50756939Sshin sa = (struct sockaddr *)addr; 50856939Sshin switch (sa->sa_family) { 50956939Sshin case AF_INET: 51056939Sshin raddr = &((struct sockaddr_in *)sa)->sin_addr; 51156939Sshin break; 51256939Sshin#ifdef INET6 51356939Sshin case AF_INET6: 51456939Sshin raddr = &((struct sockaddr_in6 *)sa)->sin6_addr; 51556939Sshin break; 51656939Sshin#endif 51756939Sshin } 51856939Sshin 51956939Sshin __iruserok_af(raddr, superuser, ruser, luser, sa->sa_family); 52056939Sshin} 52156939Sshin 52256939Sshin/* 5231573Srgrimes * XXX 5241573Srgrimes * Don't make static, used by lpd(8). 5251573Srgrimes * 5261573Srgrimes * Returns 0 if ok, -1 if not ok. 5271573Srgrimes */ 5281573Srgrimesint 5291573Srgrimes__ivaliduser(hostf, raddr, luser, ruser) 5301573Srgrimes FILE *hostf; 53139979Sdfr u_int32_t raddr; 5321573Srgrimes const char *luser, *ruser; 5331573Srgrimes{ 53455918Sshin return __ivaliduser_af(hostf, &raddr, luser, ruser, AF_INET, 53555918Sshin sizeof(raddr)); 53655918Sshin} 53755918Sshin 53855918Sshinint 53955918Sshin__ivaliduser_af(hostf, raddr, luser, ruser, af, len) 54055918Sshin FILE *hostf; 54155918Sshin void *raddr; 54255918Sshin const char *luser, *ruser; 54355918Sshin int af, len; 54455918Sshin{ 5451573Srgrimes register char *user, *p; 5461573Srgrimes int ch; 5471573Srgrimes char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 54810059Swpaul char hname[MAXHOSTNAMELEN]; 5497183Swpaul struct hostent *hp; 5507183Swpaul /* Presumed guilty until proven innocent. */ 5517183Swpaul int userok = 0, hostok = 0; 55255918Sshin int h_error; 5539978Swpaul#ifdef YP 5549978Swpaul char *ypdomain; 5551573Srgrimes 5569978Swpaul if (yp_get_default_domain(&ypdomain)) 5579978Swpaul ypdomain = NULL; 5589978Swpaul#else 5599978Swpaul#define ypdomain NULL 5609978Swpaul#endif 5617183Swpaul /* We need to get the damn hostname back for netgroup matching. */ 56255918Sshin if ((hp = getipnodebyaddr((char *)raddr, len, af, &h_error)) == NULL) 5637183Swpaul return (-1); 56423128Simp strncpy(hname, hp->h_name, sizeof(hname)); 56523128Simp hname[sizeof(hname) - 1] = '\0'; 56655918Sshin freehostent(hp); 5677183Swpaul 5681573Srgrimes while (fgets(buf, sizeof(buf), hostf)) { 5691573Srgrimes p = buf; 5701573Srgrimes /* Skip lines that are too long. */ 57158154Sbsd if (strchr(p, '\n') == NULL) { 5721573Srgrimes while ((ch = getc(hostf)) != '\n' && ch != EOF); 5731573Srgrimes continue; 5741573Srgrimes } 5759552Speter if (*p == '\n' || *p == '#') { 5769552Speter /* comment... */ 5779552Speter continue; 5789552Speter } 5791573Srgrimes while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 58052859Sache *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 5811573Srgrimes p++; 5821573Srgrimes } 5831573Srgrimes if (*p == ' ' || *p == '\t') { 5841573Srgrimes *p++ = '\0'; 5851573Srgrimes while (*p == ' ' || *p == '\t') 5861573Srgrimes p++; 5871573Srgrimes user = p; 5881573Srgrimes while (*p != '\n' && *p != ' ' && 5891573Srgrimes *p != '\t' && *p != '\0') 5901573Srgrimes p++; 5911573Srgrimes } else 5921573Srgrimes user = p; 5931573Srgrimes *p = '\0'; 5947183Swpaul /* 5957183Swpaul * Do +/- and +@/-@ checking. This looks really nasty, 5967183Swpaul * but it matches SunOS's behavior so far as I can tell. 5977183Swpaul */ 5987183Swpaul switch(buf[0]) { 5997183Swpaul case '+': 6007183Swpaul if (!buf[1]) { /* '+' matches all hosts */ 6017183Swpaul hostok = 1; 6027183Swpaul break; 6037183Swpaul } 6047183Swpaul if (buf[1] == '@') /* match a host by netgroup */ 60510059Swpaul hostok = innetgr((char *)&buf[2], 60610059Swpaul (char *)&hname, NULL, ypdomain); 6077183Swpaul else /* match a host by addr */ 60855918Sshin hostok = __icheckhost(raddr,(char *)&buf[1], 60955918Sshin af, len); 6107183Swpaul break; 6117183Swpaul case '-': /* reject '-' hosts and all their users */ 6127183Swpaul if (buf[1] == '@') { 6137183Swpaul if (innetgr((char *)&buf[2], 61410059Swpaul (char *)&hname, NULL, ypdomain)) 6157183Swpaul return(-1); 6167183Swpaul } else { 61755918Sshin if (__icheckhost(raddr,(char *)&buf[1],af,len)) 6187183Swpaul return(-1); 6197183Swpaul } 6207183Swpaul break; 6217183Swpaul default: /* if no '+' or '-', do a simple match */ 62255918Sshin hostok = __icheckhost(raddr, buf, af, len); 6237183Swpaul break; 6241573Srgrimes } 6257183Swpaul switch(*user) { 6267183Swpaul case '+': 6277183Swpaul if (!*(user+1)) { /* '+' matches all users */ 6287183Swpaul userok = 1; 6297183Swpaul break; 6307183Swpaul } 6317183Swpaul if (*(user+1) == '@') /* match a user by netgroup */ 6329978Swpaul userok = innetgr(user+2, NULL, ruser, ypdomain); 6337183Swpaul else /* match a user by direct specification */ 6347183Swpaul userok = !(strcmp(ruser, user+1)); 6357183Swpaul break; 6367183Swpaul case '-': /* if we matched a hostname, */ 6377183Swpaul if (hostok) { /* check for user field rejections */ 6387183Swpaul if (!*(user+1)) 6397183Swpaul return(-1); 6407183Swpaul if (*(user+1) == '@') { 6417183Swpaul if (innetgr(user+2, NULL, 6429978Swpaul ruser, ypdomain)) 6437183Swpaul return(-1); 6447183Swpaul } else { 6457183Swpaul if (!strcmp(ruser, user+1)) 6467183Swpaul return(-1); 6477183Swpaul } 6487183Swpaul } 6497183Swpaul break; 6507183Swpaul default: /* no rejections: try to match the user */ 6517183Swpaul if (hostok) 6527183Swpaul userok = !(strcmp(ruser,*user ? user : luser)); 6537183Swpaul break; 6547183Swpaul } 6557183Swpaul if (hostok && userok) 6567183Swpaul return(0); 6571573Srgrimes } 6581573Srgrimes return (-1); 6591573Srgrimes} 6601573Srgrimes 6611573Srgrimes/* 6621573Srgrimes * Returns "true" if match, 0 if no match. 6631573Srgrimes */ 6641573Srgrimesstatic int 66555918Sshin__icheckhost(raddr, lhost, af, len) 66655918Sshin void *raddr; 6671573Srgrimes register char *lhost; 66855918Sshin int af, len; 6691573Srgrimes{ 6701573Srgrimes register struct hostent *hp; 67155918Sshin char laddr[BUFSIZ]; /* xxx */ 6721573Srgrimes register char **pp; 67355918Sshin int h_error; 67455918Sshin int match; 6751573Srgrimes 6761573Srgrimes /* Try for raw ip address first. */ 67755918Sshin if (inet_pton(af, lhost, laddr) == 1) { 67855918Sshin if (memcmp(raddr, laddr, len) == 0) 67955918Sshin return (1); 68055918Sshin else 68155918Sshin return (0); 68255918Sshin } 6831573Srgrimes 6841573Srgrimes /* Better be a hostname. */ 68556939Sshin if ((hp = getipnodebyname(lhost, af, AI_ALL|AI_DEFAULT, &h_error)) 68656939Sshin == NULL) 6871573Srgrimes return (0); 6881573Srgrimes 6891573Srgrimes /* Spin through ip addresses. */ 69055918Sshin match = 0; 6911573Srgrimes for (pp = hp->h_addr_list; *pp; ++pp) 69255918Sshin if (!bcmp(raddr, *pp, len)) { 69355918Sshin match = 1; 69455918Sshin break; 69555918Sshin } 6961573Srgrimes 69755918Sshin freehostent(hp); 69855918Sshin return (match); 6991573Srgrimes} 700