/********************************************************************** * Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. * * All Rights Reserved. * * Reference "/usr/src/COPYRIGHT" for applicable restrictions. * **********************************************************************/ #ifndef lint static char sccsid[] = "@(#)rexecd.c 3.0 (ULTRIX-11) 4/22/86"; /* * Based on "@(#)rexecd.c 1.2 (ULTRIX) 4/11/85"; */ #endif /*----------------------------------------------------------------------- * Modification History * * 4/5/85 -- jrs * Revise to allow inetd to perform front end functions, * following the Berkeley model. * * Based on 4.2BSD labeled: * rexecd.c 4.10 83/07/02 * *----------------------------------------------------------------------- */ #include <sys/ioctl.h> #include <sys/param.h> #include <sys/socket.h> #ifndef pdp11 #include <sys/wait.h> #else pdp11 #include <wait.h> #define NCARGS 5120 #endif pdp11 #include <netinet/in.h> #include <stdio.h> #include <errno.h> #include <pwd.h> #include <signal.h> #include <netdb.h> #include <syslog.h> extern errno; struct passwd *getpwnam(); char *crypt(), *rindex(), *sprintf(); /* VARARGS 1 */ int error(); /* * remote execute server: * username\0 * password\0 * command\0 * data */ main(argc, argv) int argc; char **argv; { int fromlen; struct sockaddr_in from; fromlen = sizeof(from); if (getpeername(0, &from, &fromlen) < 0) { openlog(argv[0], LOG_PID); syslog(LOG_ERR, "getpeername: %m"); closelog(); exit(1); } (void) dup2(0, 3); (void) close(0); doit(3, &from); } char username[20] = "USER="; char homedir[64] = "HOME="; char shell[64] = "SHELL="; char *envinit[] = {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", username, 0}; char **environ; struct sockaddr_in asin = { AF_INET }; doit(f, fromp) int f; struct sockaddr_in *fromp; { char cmdbuf[NCARGS+1], *cp, *namep; char user[16], pass[16]; struct passwd *pwd; int s; short port; #ifndef pdp11 int pv[2], pid, ready, readfrom, cc; #else pdp11 int pv[2], pid, cc; long ready, readfrom; #endif pdp11 char buf[BUFSIZ], sig; int one = 1; (void) signal(SIGINT, SIG_DFL); (void) signal(SIGQUIT, SIG_DFL); (void) signal(SIGTERM, SIG_DFL); #ifdef DEBUG { int t = open("/dev/tty", 2); if (t >= 0) { ioctl(t, TIOCNOTTY, (char *)0); (void) close(t); } } #endif (void) dup2(f, 0); (void) dup2(f, 1); (void) dup2(f, 2); (void) alarm(60); port = 0; for (;;) { char c; if (read(f, &c, 1) != 1) exit(1); if (c == 0) break; port = port * 10 + c - '0'; } (void) alarm(0); if (port != 0) { s = socket(AF_INET, SOCK_STREAM, 0); if (s < 0) exit(1); if (bind(s, &asin, sizeof (asin)) < 0) exit(1); (void) alarm(60); fromp->sin_port = htons((u_short)port); if (connect(s, fromp, sizeof (*fromp)) < 0) exit(1); (void) alarm(0); } getstr(user, sizeof(user), "username"); getstr(pass, sizeof(pass), "password"); getstr(cmdbuf, sizeof(cmdbuf), "command"); (void) setpwent(); pwd = getpwnam(user); if (pwd == NULL) { error("Login incorrect.\n"); exit(1); } (void) endpwent(); if (*pwd->pw_passwd != '\0') { namep = crypt(pass, pwd->pw_passwd); if (strcmp(namep, pwd->pw_passwd)) { error("Password incorrect.\n"); exit(1); } } if (chdir(pwd->pw_dir) < 0) { error("No remote directory.\n"); exit(1); } (void) write(2, "\0", 1); if (port) { (void) pipe(pv); pid = fork(); if (pid == -1) { error("Try again.\n"); exit(1); } if (pid) { (void) close(0); (void) close(1); (void) close(2); (void) close(f); (void) close(pv[1]); #ifndef pdp11 readfrom = (1<<s) | (1<<pv[0]); #else pdp11 readfrom = (1L<<s) | (1L<<pv[0]); #endif pdp11 ioctl(pv[1], FIONBIO, (char *)&one); /* should set s nbio! */ do { ready = readfrom; (void) select(16, &ready, 0, 0, 0); #ifndef pdp11 if (ready & (1<<s)) { #else pdp11 if (ready & (1L<<s)) { #endif pdp11 if (read(s, &sig, 1) <= 0) #ifndef pdp11 readfrom &= ~(1<<s); #else pdp11 readfrom &= ~(1L<<s); #endif pdp11 else (void) killpg(pid, sig); } #ifndef pdp11 if (ready & (1<<pv[0])) { #else pdp11 if (ready & (1L<<pv[0])) { #endif pdp11 cc = read(pv[0], buf, sizeof (buf)); if (cc <= 0) { (void) shutdown(s, 1+1); #ifndef pdp11 readfrom &= ~(1<<pv[0]); #else pdp11 readfrom &= ~(1L<<pv[0]); #endif pdp11 } else (void) write(s, buf, cc); } } while (readfrom); exit(0); } (void) setpgrp(0, getpid()); (void) close(s); (void)close(pv[0]); (void) dup2(pv[1], 2); } if (*pwd->pw_shell == '\0') pwd->pw_shell = "/bin/sh"; (void) close(f); #ifndef pdp11 initgroups(pwd->pw_name, pwd->pw_gid); #endif pdp11 (void) setuid(pwd->pw_uid); (void) setgid(pwd->pw_gid); environ = envinit; (void) strncat(homedir, pwd->pw_dir, sizeof(homedir)-6); (void) strncat(shell, pwd->pw_shell, sizeof(shell)-7); (void) strncat(username, pwd->pw_name, sizeof(username)-6); cp = rindex(pwd->pw_shell, '/'); if (cp) cp++; else cp = pwd->pw_shell; execl(pwd->pw_shell, cp, "-c", cmdbuf, 0); perror(pwd->pw_shell); exit(1); } /* VARARGS 1 */ error(fmt, a1, a2, a3) char *fmt; int a1, a2, a3; { char buf[BUFSIZ]; buf[0] = 1; (void) sprintf(buf+1, fmt, a1, a2, a3); (void) write(2, buf, strlen(buf)); } getstr(buf, cnt, err) char *buf; int cnt; char *err; { char c; do { if (read(0, &c, 1) != 1) exit(1); *buf++ = c; if (--cnt == 0) { error("%s too long\n", err); exit(1); } } while (c != 0); }