326 lines
7.9 KiB
C
326 lines
7.9 KiB
C
/* $NetBSD: rexecd.c,v 1.11 2002/06/05 23:05:34 itojun Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#if 0
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static char sccsid[] = "from: @(#)rexecd.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: rexecd.c,v 1.11 2002/06/05 23:05:34 itojun Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <err.h>
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#include <errno.h>
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#include <netdb.h>
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#include <paths.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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void error __P((const char *, ...))
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__attribute__((__format__(__printf__, 1, 2)));
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int main __P((int, char **));
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void doit __P((int, struct sockaddr *));
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void getstr __P((char *, int, char *));
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char username[32 + 1] = "USER=";
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char homedir[PATH_MAX + 1] = "HOME=";
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char shell[PATH_MAX + 1] = "SHELL=";
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char path[sizeof(_PATH_DEFPATH) + sizeof("PATH=")] = "PATH=";
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char *envinit[] = { homedir, shell, path, username, 0 };
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char **environ;
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int log;
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/*
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* remote execute server:
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* username\0
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* password\0
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* command\0
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* data
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*/
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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struct sockaddr_storage from;
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int fromlen, ch;
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while ((ch = getopt(argc, argv, "l")) != -1)
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switch (ch) {
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case 'l':
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log = 1;
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openlog("rexecd", LOG_PID, LOG_DAEMON);
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break;
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default:
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exit(1);
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}
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fromlen = sizeof (from);
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if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0)
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err(1, "getpeername");
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doit(0, (struct sockaddr *)&from);
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exit(0);
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}
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void
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doit(f, fromp)
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int f;
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struct sockaddr *fromp;
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{
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struct pollfd fds[2];
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char cmdbuf[NCARGS+1], *namep;
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const char *cp;
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char user[16], pass[16];
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char buf[BUFSIZ], sig;
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struct passwd *pwd;
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int s = -1; /* XXX gcc */
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int pv[2], pid, cc;
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int one = 1;
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in_port_t port;
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(void)signal(SIGINT, SIG_DFL);
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(void)signal(SIGQUIT, SIG_DFL);
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(void)signal(SIGTERM, SIG_DFL);
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dup2(f, 0);
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dup2(f, 1);
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dup2(f, 2);
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(void)alarm(60);
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port = 0;
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for (;;) {
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char c;
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if (read(f, &c, 1) != 1) {
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if (log)
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syslog(LOG_ERR,
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"initial read failed");
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exit(1);
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}
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if (c == 0)
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break;
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port = port * 10 + c - '0';
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}
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(void)alarm(0);
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if (port != 0) {
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s = socket(fromp->sa_family, SOCK_STREAM, 0);
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if (s < 0) {
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if (log)
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syslog(LOG_ERR, "socket: %m");
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exit(1);
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}
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(void)alarm(60);
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switch (fromp->sa_family) {
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case AF_INET:
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((struct sockaddr_in *)fromp)->sin_port = htons(port);
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break;
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case AF_INET6:
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((struct sockaddr_in6 *)fromp)->sin6_port = htons(port);
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break;
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default:
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syslog(LOG_ERR, "unsupported address family");
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exit(1);
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}
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if (connect(s, (struct sockaddr *)fromp, fromp->sa_len) < 0) {
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if (log)
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syslog(LOG_ERR, "connect: %m");
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exit(1);
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}
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(void)alarm(0);
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}
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getstr(user, sizeof(user), "username");
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getstr(pass, sizeof(pass), "password");
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getstr(cmdbuf, sizeof(cmdbuf), "command");
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setpwent();
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pwd = getpwnam(user);
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if (pwd == NULL) {
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error("Login incorrect.\n");
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if (log)
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syslog(LOG_ERR, "no such user %s", user);
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exit(1);
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}
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endpwent();
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if (*pwd->pw_passwd != '\0') {
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namep = crypt(pass, pwd->pw_passwd);
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if (strcmp(namep, pwd->pw_passwd)) {
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error("Password incorrect.\n"); /* XXX: wrong! */
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if (log)
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syslog(LOG_ERR, "incorrect password for %s",
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user);
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exit(1);
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}
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} else
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(void)crypt("dummy password", "PA"); /* must always crypt */
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if (chdir(pwd->pw_dir) < 0) {
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error("No remote directory.\n");
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if (log)
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syslog(LOG_ERR, "%s does not exist for %s", pwd->pw_dir,
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user);
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exit(1);
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}
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(void)write(2, "\0", 1);
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if (port) {
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if (pipe(pv) < 0 || (pid = fork()) == -1) {
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error("Try again.\n");
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if (log)
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syslog(LOG_ERR,"pipe or fork failed for %s: %m",
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user);
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exit(1);
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}
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if (pid) {
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(void)close(0);
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(void)close(1);
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(void)close(2);
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(void)close(f);
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(void)close(pv[1]);
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fds[0].fd = s;
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fds[1].fd = pv[0];
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fds[0].events = fds[1].events = POLLIN;
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if (ioctl(pv[1], FIONBIO, (char *)&one) < 0)
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_exit(1);
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/* should set s nbio! */
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do {
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if (poll(fds, 2, 0) < 0) {
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close(s);
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close(pv[0]);
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_exit(1);
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}
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if (fds[0].revents & POLLIN) {
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if (read(s, &sig, 1) <= 0)
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fds[0].events = 0;
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else
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killpg(pid, sig);
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}
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if (fds[1].revents & POLLIN) {
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cc = read(pv[0], buf, sizeof (buf));
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if (cc <= 0) {
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shutdown(s, 1+1);
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fds[1].events = 0;
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} else
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(void)write(s, buf, cc);
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}
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} while ((fds[0].events | fds[1].events) & POLLIN);
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_exit(0);
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}
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(void)setpgrp(0, getpid());
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(void)close(s);
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(void)close(pv[0]);
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if (dup2(pv[1], 2) < 0) {
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error("Try again.\n");
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if (log)
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syslog(LOG_ERR, "dup2 failed for %s", user);
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exit(1);
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}
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}
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if (*pwd->pw_shell == '\0')
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pwd->pw_shell = _PATH_BSHELL;
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if (f > 2)
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(void)close(f);
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if (setlogin(pwd->pw_name) < 0 ||
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initgroups(pwd->pw_name, pwd->pw_gid) < 0 ||
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setgid((gid_t)pwd->pw_gid) < 0 ||
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setuid((uid_t)pwd->pw_uid) < 0) {
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error("Try again.\n");
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if (log)
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syslog(LOG_ERR, "could not set permissions for %s: %m",
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user);
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exit(1);
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}
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(void)strcat(path, _PATH_DEFPATH);
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environ = envinit;
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strncat(homedir, pwd->pw_dir, sizeof(homedir) - 6);
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strncat(shell, pwd->pw_shell, sizeof(shell) - 7);
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strncat(username, pwd->pw_name, sizeof(username) - 6);
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cp = strrchr(pwd->pw_shell, '/');
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if (cp)
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cp++;
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else
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cp = pwd->pw_shell;
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if (log)
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syslog(LOG_INFO, "running command for %s: %s", user, cmdbuf);
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execl(pwd->pw_shell, cp, "-c", cmdbuf, 0);
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perror(pwd->pw_shell);
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if (log)
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syslog(LOG_ERR, "execl failed for %s: %m", user);
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exit(1);
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}
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void
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error(const char *fmt, ...)
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{
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char buf[BUFSIZ];
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va_list ap;
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va_start(ap, fmt);
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buf[0] = 1;
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(void)vsnprintf(buf+1, sizeof(buf) - 1, fmt, ap);
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(void)write(2, buf, strlen(buf));
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va_end(ap);
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}
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void
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getstr(buf, cnt, err)
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char *buf;
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int cnt;
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char *err;
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{
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char c;
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do {
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if (read(0, &c, 1) != 1)
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exit(1);
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*buf++ = c;
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if (--cnt == 0) {
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error("%s too long\n", err);
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exit(1);
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}
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} while (c != 0);
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}
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