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
35 static const char copyright[] =
36 "@(#) Copyright (c) 1983, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
42 static char sccsid[] = "@(#)rexecd.c 8.1 (Berkeley) 6/4/93";
44 static const char rcsid[] =
45 "$FreeBSD: src/libexec/rexecd/rexecd.c,v 1.18.2.3 2002/05/14 22:27:21 des Exp $";
48 #include <sys/param.h>
49 #include <sys/ioctl.h>
50 #include <sys/socket.h>
52 #include <netinet/in.h>
67 char username[MAXLOGNAME + 5 + 1] = "USER=";
68 char homedir[MAXPATHLEN + 5 + 1] = "HOME=";
69 char shell[MAXPATHLEN + 6 + 1] = "SHELL=";
70 char path[sizeof(_PATH_DEFPATH) + sizeof("PATH=")] = "PATH=";
72 {homedir, shell, path, username, 0};
74 char remote[MAXHOSTNAMELEN];
76 struct sockaddr_in asin = { AF_INET };
78 void doit __P((int, struct sockaddr_in *));
79 void getstr __P((char *, int, char *));
88 syslog(LOG_ERR, "usage: rexecd [-i]");
93 * remote execute server:
105 struct sockaddr_in from;
109 openlog("rexecd", LOG_PID, LOG_AUTH);
111 while ((ch = getopt(argc, argv, "i")) != -1)
122 fromlen = sizeof (from);
123 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0)
124 err(1, "getpeername");
126 realhostname(remote, sizeof(remote) - 1, &from.sin_addr);
135 struct sockaddr_in *fromp;
138 char cmdbuf[NCARGS+1], *cp, *namep;
140 char user[16], pass[100];
142 char user[16], pass[16];
147 int pv[2], pid, ready, readfrom, cc;
148 char buf[BUFSIZ], sig;
151 (void) signal(SIGINT, SIG_DFL);
152 (void) signal(SIGQUIT, SIG_DFL);
153 (void) signal(SIGTERM, SIG_DFL);
155 { int t = open(_PATH_TTY, 2);
157 ioctl(t, TIOCNOTTY, (char *)0);
169 if (read(f, &c, 1) != 1)
173 port = port * 10 + c - '0';
177 s = socket(AF_INET, SOCK_STREAM, 0);
180 if (bind(s, (struct sockaddr *)&asin, sizeof (asin)) < 0)
183 fromp->sin_port = htons(port);
184 if (connect(s, (struct sockaddr *)fromp, sizeof (*fromp)) < 0)
189 getstr(user, sizeof(user), "username");
190 getstr(pass, sizeof(pass), "password");
191 getstr(cmdbuf, sizeof(cmdbuf), "command");
194 pwd = getpwnam(user);
196 error("Login incorrect.\n");
200 if (*pwd->pw_passwd != '\0') {
202 namep = skey_crypt(pass, pwd->pw_passwd, pwd,
203 skeyaccess(user, NULL, remote, NULL));
205 namep = crypt(pass, pwd->pw_passwd);
207 if (strcmp(namep, pwd->pw_passwd)) {
208 syslog(LOG_ERR, "LOGIN FAILURE from %s, %s",
210 error("Login incorrect.\n");
215 if ((pwd->pw_uid == 0 && no_uid_0) || *pwd->pw_passwd == '\0' ||
216 (pwd->pw_expire && time(NULL) >= pwd->pw_expire)) {
217 syslog(LOG_ERR, "%s LOGIN REFUSED from %s", user, remote);
218 error("Login incorrect.\n");
222 if ((fp = fopen(_PATH_FTPUSERS, "r")) != NULL) {
223 while (fgets(buf, sizeof(buf), fp) != NULL) {
224 if ((cp = index(buf, '\n')) != NULL)
226 if (strcmp(buf, pwd->pw_name) == 0) {
227 syslog(LOG_ERR, "%s LOGIN REFUSED from %s",
229 error("Login incorrect.\n");
236 syslog(LOG_INFO, "login from %s as %s", remote, user);
238 (void) write(2, "\0", 1);
243 error("Try again.\n");
247 (void) close(0); (void) close(1); (void) close(2);
248 (void) close(f); (void) close(pv[1]);
249 readfrom = (1<<s) | (1<<pv[0]);
250 ioctl(pv[1], FIONBIO, (char *)&one);
251 /* should set s nbio! */
254 (void) select(16, (fd_set *)&ready,
255 (fd_set *)NULL, (fd_set *)NULL,
256 (struct timeval *)NULL);
257 if (ready & (1<<s)) {
258 if (read(s, &sig, 1) <= 0)
263 if (ready & (1<<pv[0])) {
264 cc = read(pv[0], buf, sizeof (buf));
267 readfrom &= ~(1<<pv[0]);
269 (void) write(s, buf, cc);
274 setpgrp(0, getpid());
275 (void) close(s); (void)close(pv[0]);
278 if (*pwd->pw_shell == '\0')
279 pwd->pw_shell = _PATH_BSHELL;
282 if (setlogin(pwd->pw_name) < 0)
283 syslog(LOG_ERR, "setlogin() failed: %m");
284 (void) setgid((gid_t)pwd->pw_gid);
285 initgroups(pwd->pw_name, pwd->pw_gid);
286 (void) setuid((uid_t)pwd->pw_uid);
287 (void)strcat(path, _PATH_DEFPATH);
289 strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
290 strncat(shell, pwd->pw_shell, sizeof(shell)-7);
291 strncat(username, pwd->pw_name, sizeof(username)-6);
292 cp = strrchr(pwd->pw_shell, '/');
297 if (chdir(pwd->pw_dir) < 0) {
298 error("No remote directory.\n");
301 execl(pwd->pw_shell, cp, "-c", cmdbuf, 0);
302 err(1, "%s", pwd->pw_shell);
307 error(fmt, a1, a2, a3)
314 (void) snprintf(buf+1, sizeof(buf) - 1, fmt, a1, a2, a3);
315 (void) write(2, buf, strlen(buf));
319 getstr(buf, cnt, err)
327 if (read(0, &c, 1) != 1)
331 error("%s too long\n", err);