1/* 2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights 7 * Reserved. This file contains Original Code and/or Modifications of 8 * Original Code as defined in and that are subject to the Apple Public 9 * Source License Version 1.0 (the 'License'). You may not use this file 10 * except in compliance with the License. Please obtain a copy of the 11 * License at http://www.apple.com/publicsource and read it before using 12 * this file. 13 * 14 * The Original Code and all software distributed under the License are 15 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the 19 * License for the specific language governing rights and limitations 20 * under the License." 21 * 22 * @APPLE_LICENSE_HEADER_END@ 23 */ 24/* 25 * Copyright (c) 1983, 1993 26 * The Regents of the University of California. All rights reserved. 27 * 28 * Redistribution and use in source and binary forms, with or without 29 * modification, are permitted provided that the following conditions 30 * are met: 31 * 1. Redistributions of source code must retain the above copyright 32 * notice, this list of conditions and the following disclaimer. 33 * 2. Redistributions in binary form must reproduce the above copyright 34 * notice, this list of conditions and the following disclaimer in the 35 * documentation and/or other materials provided with the distribution. 36 * 3. All advertising materials mentioning features or use of this software 37 * must display the following acknowledgement: 38 * This product includes software developed by the University of 39 * California, Berkeley and its contributors. 40 * 4. Neither the name of the University nor the names of its contributors 41 * may be used to endorse or promote products derived from this software 42 * without specific prior written permission. 43 * 44 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 47 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 54 * SUCH DAMAGE. 55 */ 56 57#include <sys/cdefs.h> 58#ifndef lint 59__unused static char copyright[] = 60"@(#) Copyright (c) 1983, 1993\n\ 61 The Regents of the University of California. All rights reserved.\n"; 62#endif /* not lint */ 63 64#ifndef lint 65__unused static char sccsid[] = "@(#)rexecd.c 8.1 (Berkeley) 6/4/93"; 66#endif /* not lint */ 67 68#include <sys/param.h> 69#include <sys/ioctl.h> 70#include <sys/socket.h> 71#include <sys/time.h> 72 73#include <netinet/in.h> 74 75#include <errno.h> 76#include <netdb.h> 77#include <paths.h> 78#include <pwd.h> 79#include <signal.h> 80#include <stdarg.h> 81#include <stdio.h> 82#include <stdlib.h> 83#include <string.h> 84#include <unistd.h> 85 86void doit() __dead2; 87void error(const char *, ...); 88void getstr(); 89 90/* 91 * remote execute server: 92 * username\0 93 * password\0 94 * command\0 95 * data 96 */ 97/*ARGSUSED*/ 98int 99main(argc, argv) 100 int argc; 101 char **argv; 102{ 103 struct sockaddr_in from; 104 socklen_t fromlen; 105 106 fromlen = sizeof (from); 107 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { 108 (void)fprintf(stderr, 109 "rexecd: getpeername: %s\n", strerror(errno)); 110 exit(1); 111 } 112 doit(0, &from); 113} 114 115char username[20] = "USER="; 116char homedir[64] = "HOME="; 117char shell[64] = "SHELL="; 118char path[sizeof(_PATH_DEFPATH) + sizeof("PATH=")] = "PATH="; 119char *envinit[] = 120 {homedir, shell, path, username, 0}; 121#ifdef __APPLE__ 122extern 123#endif 124char **environ; 125 126struct sockaddr_in a_sin = { AF_INET }; 127 128void 129doit(f, fromp) 130 int f; 131 struct sockaddr_in *fromp; 132{ 133 char cmdbuf[NCARGS+1], *cp, *namep; 134 char user[16], pass[16]; 135 struct passwd *pwd; 136 int s = -1; 137 u_short port; 138 int pv[2], pid, ready, readfrom, cc; 139 char buf[BUFSIZ], sig; 140 int one = 1; 141 142 (void) signal(SIGINT, SIG_DFL); 143 (void) signal(SIGQUIT, SIG_DFL); 144 (void) signal(SIGTERM, SIG_DFL); 145#ifdef DEBUG 146 { int t = open(_PATH_TTY, 2); 147 if (t >= 0) { 148 ioctl(t, TIOCNOTTY, (char *)0); 149 (void) close(t); 150 } 151 } 152#endif 153 dup2(f, 0); 154 dup2(f, 1); 155 dup2(f, 2); 156 (void) alarm(60); 157 port = 0; 158 for (;;) { 159 char c; 160 if (read(f, &c, 1) != 1) 161 exit(1); 162 if (c == 0) 163 break; 164 port = port * 10 + c - '0'; 165 } 166 (void) alarm(0); 167 if (port != 0) { 168 s = socket(AF_INET, SOCK_STREAM, 0); 169 if (s < 0) 170 exit(1); 171 if (bind(s, (struct sockaddr *)&a_sin, sizeof (a_sin)) < 0) 172 exit(1); 173 (void) alarm(60); 174 fromp->sin_port = htons(port); 175 if (connect(s, (struct sockaddr *)fromp, sizeof (*fromp)) < 0) 176 exit(1); 177 (void) alarm(0); 178 } 179 getstr(user, sizeof(user), "username"); 180 getstr(pass, sizeof(pass), "password"); 181 getstr(cmdbuf, sizeof(cmdbuf), "command"); 182 setpwent(); 183 pwd = getpwnam(user); 184 if (pwd == NULL) { 185 error("Login incorrect.\n"); 186 exit(1); 187 } 188 endpwent(); 189 if (*pwd->pw_passwd != '\0') { 190 namep = crypt(pass, pwd->pw_passwd); 191 if (strcmp(namep, pwd->pw_passwd)) { 192 error("Password incorrect.\n"); 193 exit(1); 194 } 195 } 196 if (chdir(pwd->pw_dir) < 0) { 197 error("No remote directory.\n"); 198 exit(1); 199 } 200 (void) write(2, "\0", 1); 201 if (port) { 202 (void) pipe(pv); 203 pid = fork(); 204 if (pid == -1) { 205 error("Try again.\n"); 206 exit(1); 207 } 208 if (pid) { 209 (void) close(0); (void) close(1); (void) close(2); 210 (void) close(f); (void) close(pv[1]); 211 readfrom = (1<<s) | (1<<pv[0]); 212 ioctl(pv[1], FIONBIO, (char *)&one); 213 /* should set s nbio! */ 214 do { 215 ready = readfrom; 216 (void) select(16, (fd_set *)&ready, 217 (fd_set *)NULL, (fd_set *)NULL, 218 (struct timeval *)NULL); 219 if (ready & (1<<s)) { 220 if (read(s, &sig, 1) <= 0) 221 readfrom &= ~(1<<s); 222 else 223 killpg(pid, sig); 224 } 225 if (ready & (1<<pv[0])) { 226 cc = read(pv[0], buf, sizeof (buf)); 227 if (cc <= 0) { 228 shutdown(s, 1+1); 229 readfrom &= ~(1<<pv[0]); 230 } else 231 (void) write(s, buf, cc); 232 } 233 } while (readfrom); 234 exit(0); 235 } 236 setpgid(0, getpid()); 237 (void) close(s); (void)close(pv[0]); 238 dup2(pv[1], 2); 239 } 240 if (*pwd->pw_shell == '\0') 241 pwd->pw_shell = _PATH_BSHELL; 242 if (f > 2) 243 (void) close(f); 244 (void) setgid((gid_t)pwd->pw_gid); 245 initgroups(pwd->pw_name, pwd->pw_gid); 246 (void) setuid((uid_t)pwd->pw_uid); 247 (void)strcat(path, _PATH_DEFPATH); 248 environ = envinit; 249 strncat(homedir, pwd->pw_dir, sizeof(homedir)-6); 250 strncat(shell, pwd->pw_shell, sizeof(shell)-7); 251 strncat(username, pwd->pw_name, sizeof(username)-6); 252 cp = strrchr(pwd->pw_shell, '/'); 253 if (cp) 254 cp++; 255 else 256 cp = pwd->pw_shell; 257 execl(pwd->pw_shell, cp, "-c", cmdbuf, NULL); 258 perror(pwd->pw_shell); 259 exit(1); 260} 261 262void 263error(const char *fmt, ...) 264{ 265 char buf[BUFSIZ]; 266 va_list ap; 267 268 buf[0] = 1; 269 va_start(ap, fmt); 270 (void) vsnprintf(buf+1, sizeof(buf) - 1, fmt, ap); 271 va_end(ap); 272 (void) write(2, buf, strlen(buf)); 273} 274 275void 276getstr(buf, cnt, err) 277 char *buf; 278 int cnt; 279 char *err; 280{ 281 char c; 282 283 do { 284 if (read(0, &c, 1) != 1) 285 exit(1); 286 *buf++ = c; 287 if (--cnt == 0) { 288 error("%s too long\n", err); 289 exit(1); 290 } 291 } while (c != 0); 292} 293