2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)rexecd.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: src/libexec/rexecd/rexecd.c,v 1.18.2.3 2002/05/14 22:27:21 des Exp $
36 * $DragonFly: src/libexec/rexecd/rexecd.c,v 1.5 2007/11/25 01:28:23 swildner Exp $
39 #include <sys/param.h>
40 #include <sys/ioctl.h>
41 #include <sys/socket.h>
43 #include <netinet/in.h>
59 char username[MAXLOGNAME + 5 + 1] = "USER=";
60 char homedir[MAXPATHLEN + 5 + 1] = "HOME=";
61 char shell[MAXPATHLEN + 6 + 1] = "SHELL=";
62 char path[sizeof(_PATH_DEFPATH) + sizeof("PATH=")] = "PATH=";
64 {homedir, shell, path, username, 0};
66 char remote[MAXHOSTNAMELEN];
68 struct sockaddr_in asin = { AF_INET };
70 void doit (int, struct sockaddr_in *);
71 void getstr (char *, int, char *);
80 syslog(LOG_ERR, "usage: rexecd [-i]");
85 * remote execute server:
97 struct sockaddr_in from;
101 openlog("rexecd", LOG_PID, LOG_AUTH);
103 while ((ch = getopt(argc, argv, "i")) != -1)
114 fromlen = sizeof (from);
115 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0)
116 err(1, "getpeername");
118 realhostname(remote, sizeof(remote) - 1, &from.sin_addr);
127 struct sockaddr_in *fromp;
130 char cmdbuf[NCARGS+1], *cp, *namep;
132 char user[16], pass[100];
134 char user[16], pass[16];
139 int pv[2], pid, ready, readfrom, cc;
140 char buf[BUFSIZ], sig;
143 (void) signal(SIGINT, SIG_DFL);
144 (void) signal(SIGQUIT, SIG_DFL);
145 (void) signal(SIGTERM, SIG_DFL);
147 { int t = open(_PATH_TTY, 2);
149 ioctl(t, TIOCNOTTY, (char *)0);
161 if (read(f, &c, 1) != 1)
165 port = port * 10 + c - '0';
169 s = socket(AF_INET, SOCK_STREAM, 0);
172 if (bind(s, (struct sockaddr *)&asin, sizeof (asin)) < 0)
175 fromp->sin_port = htons(port);
176 if (connect(s, (struct sockaddr *)fromp, sizeof (*fromp)) < 0)
181 getstr(user, sizeof(user), "username");
182 getstr(pass, sizeof(pass), "password");
183 getstr(cmdbuf, sizeof(cmdbuf), "command");
186 pwd = getpwnam(user);
188 error("Login incorrect.\n");
192 if (*pwd->pw_passwd != '\0') {
194 namep = skey_crypt(pass, pwd->pw_passwd, pwd,
195 skeyaccess(user, NULL, remote, NULL));
197 namep = crypt(pass, pwd->pw_passwd);
199 if (strcmp(namep, pwd->pw_passwd)) {
200 syslog(LOG_ERR, "LOGIN FAILURE from %s, %s",
202 error("Login incorrect.\n");
207 if ((pwd->pw_uid == 0 && no_uid_0) || *pwd->pw_passwd == '\0' ||
208 (pwd->pw_expire && time(NULL) >= pwd->pw_expire)) {
209 syslog(LOG_ERR, "%s LOGIN REFUSED from %s", user, remote);
210 error("Login incorrect.\n");
214 if ((fp = fopen(_PATH_FTPUSERS, "r")) != NULL) {
215 while (fgets(buf, sizeof(buf), fp) != NULL) {
216 if ((cp = index(buf, '\n')) != NULL)
218 if (strcmp(buf, pwd->pw_name) == 0) {
219 syslog(LOG_ERR, "%s LOGIN REFUSED from %s",
221 error("Login incorrect.\n");
228 syslog(LOG_INFO, "login from %s as %s", remote, user);
230 (void) write(2, "\0", 1);
235 error("Try again.\n");
239 (void) close(0); (void) close(1); (void) close(2);
240 (void) close(f); (void) close(pv[1]);
241 readfrom = (1<<s) | (1<<pv[0]);
242 ioctl(pv[1], FIONBIO, (char *)&one);
243 /* should set s nbio! */
246 (void) select(16, (fd_set *)&ready,
247 (fd_set *)NULL, (fd_set *)NULL,
248 (struct timeval *)NULL);
249 if (ready & (1<<s)) {
250 if (read(s, &sig, 1) <= 0)
255 if (ready & (1<<pv[0])) {
256 cc = read(pv[0], buf, sizeof (buf));
258 shutdown(s, SHUT_RDWR);
259 readfrom &= ~(1<<pv[0]);
261 (void) write(s, buf, cc);
266 setpgrp(0, getpid());
267 (void) close(s); (void)close(pv[0]);
270 if (*pwd->pw_shell == '\0')
271 pwd->pw_shell = _PATH_BSHELL;
274 if (setlogin(pwd->pw_name) < 0)
275 syslog(LOG_ERR, "setlogin() failed: %m");
276 (void) setgid((gid_t)pwd->pw_gid);
277 initgroups(pwd->pw_name, pwd->pw_gid);
278 (void) setuid((uid_t)pwd->pw_uid);
279 (void)strcat(path, _PATH_DEFPATH);
281 strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
282 strncat(shell, pwd->pw_shell, sizeof(shell)-7);
283 strncat(username, pwd->pw_name, sizeof(username)-6);
284 cp = strrchr(pwd->pw_shell, '/');
289 if (chdir(pwd->pw_dir) < 0) {
290 error("No remote directory.\n");
293 execl(pwd->pw_shell, cp, "-c", cmdbuf, 0);
294 err(1, "%s", pwd->pw_shell);
299 error(fmt, a1, a2, a3)
306 (void) snprintf(buf+1, sizeof(buf) - 1, fmt, a1, a2, a3);
307 (void) write(2, buf, strlen(buf));
311 getstr(buf, cnt, err)
319 if (read(0, &c, 1) != 1)
323 error("%s too long\n", err);