635 lines
15 KiB
C
635 lines
15 KiB
C
/*-
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* Copyright (c) 1988, 1989, 1992, 1993, 1994
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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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/*
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* remote shell server:
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* [port]\0
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* remuser\0
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* locuser\0
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* command\0
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* data
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*/
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#include "bsd_locl.h"
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RCSID("$Id: rshd.c,v 1.58 1999/06/17 18:49:43 assar Exp $");
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extern char *__rcmd_errstr; /* syslog hook from libc/net/rcmd.c. */
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extern int __check_rhosts_file;
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static int keepalive = 1;
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static int log_success; /* If TRUE, log all successful accesses */
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static int new_pag = 1; /* Put process in new PAG by default */
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static int no_inetd = 0;
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static int sent_null;
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static void doit (struct sockaddr_in *);
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static void error (const char *, ...)
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#ifdef __GNUC__
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__attribute__ ((format (printf, 1, 2)))
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#endif
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;
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static void usage (void);
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#define VERSION_SIZE 9
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#define SECURE_MESSAGE "This rsh session is using DES encryption for all transmissions.\r\n"
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#define OPTIONS "alnkvxLp:Pi"
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AUTH_DAT authbuf;
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KTEXT_ST tickbuf;
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int doencrypt, use_kerberos, vacuous;
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Key_schedule schedule;
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int
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main(int argc, char *argv[])
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{
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struct linger linger;
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int ch, on = 1, fromlen;
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struct sockaddr_in from;
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int portnum = 0;
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set_progname(argv[0]);
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openlog("rshd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
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opterr = 0;
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while ((ch = getopt(argc, argv, OPTIONS)) != EOF)
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switch (ch) {
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case 'a':
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break;
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case 'l':
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__check_rhosts_file = 0;
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break;
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case 'n':
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keepalive = 0;
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break;
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case 'k':
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use_kerberos = 1;
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break;
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case 'v':
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vacuous = 1;
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break;
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case 'x':
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doencrypt = 1;
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break;
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case 'L':
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log_success = 1;
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break;
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case 'p':
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portnum = htons(atoi(optarg));
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break;
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case 'P':
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new_pag = 0;
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break;
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case 'i':
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no_inetd = 1;
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break;
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case '?':
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default:
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usage();
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break;
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}
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argc -= optind;
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argv += optind;
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if (use_kerberos && vacuous) {
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syslog(LOG_ERR, "only one of -k and -v allowed");
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exit(2);
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}
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if (doencrypt && !use_kerberos) {
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syslog(LOG_ERR, "-k is required for -x");
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exit(2);
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}
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if (no_inetd) {
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if(portnum == 0)
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portnum = get_shell_port (use_kerberos, doencrypt);
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mini_inetd (portnum);
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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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syslog(LOG_ERR, "getpeername: %m");
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_exit(1);
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}
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#ifdef HAVE_SETSOCKOPT
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#ifdef SO_KEEPALIVE
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if (keepalive &&
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setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (void *)&on,
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sizeof(on)) < 0)
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syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
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#endif
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#ifdef SO_LINGER
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linger.l_onoff = 1;
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linger.l_linger = 60; /* XXX */
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if (setsockopt(0, SOL_SOCKET, SO_LINGER, (void *)&linger,
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sizeof (linger)) < 0)
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syslog(LOG_WARNING, "setsockopt (SO_LINGER): %m");
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#endif
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#endif /* HAVE_SETSOCKOPT */
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doit(&from);
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/* NOTREACHED */
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return 0;
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}
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char username[20] = "USER=";
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char homedir[64] = "HOME=";
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char shell[64] = "SHELL=";
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char path[100] = "PATH=";
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char *envinit[] =
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{homedir, shell, path, username, 0};
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static void
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xgetstr(char *buf, int cnt, char *err)
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{
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char c;
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do {
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if (read(STDIN_FILENO, &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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static void
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doit(struct sockaddr_in *fromp)
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{
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struct passwd *pwd;
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u_short port;
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fd_set ready, readfrom;
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int cc, nfd, pv[2], pid, s;
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int one = 1;
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const char *errorhost = "";
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char *errorstr;
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char *cp, sig, buf[DES_RW_MAXWRITE];
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char cmdbuf[NCARGS+1], locuser[16], remuser[16];
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char remotehost[2 * MaxHostNameLen + 1];
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AUTH_DAT *kdata;
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KTEXT ticket;
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char instance[INST_SZ], version[VERSION_SIZE];
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struct sockaddr_in fromaddr;
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int rc;
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long authopts;
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int pv1[2], pv2[2];
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fd_set wready, writeto;
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fromaddr = *fromp;
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signal(SIGINT, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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#ifdef DEBUG
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{ int t = open(_PATH_TTY, 2);
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if (t >= 0) {
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ioctl(t, TIOCNOTTY, (char *)0);
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close(t);
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}
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}
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#endif
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fromp->sin_port = ntohs((u_short)fromp->sin_port);
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if (fromp->sin_family != AF_INET) {
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syslog(LOG_ERR, "malformed \"from\" address (af %d)\n",
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fromp->sin_family);
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exit(1);
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}
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if (!use_kerberos) {
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ip_options_and_die (0, fromp);
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if (fromp->sin_port >= IPPORT_RESERVED ||
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fromp->sin_port < IPPORT_RESERVED/2) {
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syslog(LOG_NOTICE|LOG_AUTH,
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"Connection from %s on illegal port %u",
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inet_ntoa(fromp->sin_addr),
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fromp->sin_port);
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exit(1);
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}
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}
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alarm(60);
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port = 0;
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for (;;) {
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char c;
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if ((cc = read(STDIN_FILENO, &c, 1)) != 1) {
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if (cc < 0)
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syslog(LOG_NOTICE, "read: %m");
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shutdown(0, 1+1);
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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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alarm(0);
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if (port != 0) {
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int lport = IPPORT_RESERVED - 1;
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s = rresvport(&lport);
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if (s < 0) {
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syslog(LOG_ERR, "can't get stderr port: %m");
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exit(1);
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}
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if (!use_kerberos)
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if (port >= IPPORT_RESERVED) {
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syslog(LOG_ERR, "2nd port not reserved\n");
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exit(1);
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}
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fromp->sin_port = htons(port);
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if (connect(s, (struct sockaddr *)fromp, sizeof (*fromp)) < 0) {
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syslog(LOG_INFO, "connect second port %d: %m", port);
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exit(1);
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}
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}
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if (vacuous) {
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error("rshd: Remote host requires Kerberos authentication.\n");
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exit(1);
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}
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errorstr = NULL;
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inaddr2str (fromp->sin_addr, remotehost, sizeof(remotehost));
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if (use_kerberos) {
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kdata = &authbuf;
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ticket = &tickbuf;
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authopts = 0L;
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k_getsockinst(0, instance, sizeof(instance));
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version[VERSION_SIZE - 1] = '\0';
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if (doencrypt) {
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struct sockaddr_in local_addr;
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rc = sizeof(local_addr);
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if (getsockname(0, (struct sockaddr *)&local_addr,
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&rc) < 0) {
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syslog(LOG_ERR, "getsockname: %m");
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error("rshd: getsockname: %m");
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exit(1);
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}
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authopts = KOPT_DO_MUTUAL;
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rc = krb_recvauth(authopts, 0, ticket,
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"rcmd", instance, &fromaddr,
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&local_addr, kdata, "", schedule,
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version);
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#ifndef NOENCRYPTION
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des_set_key(&kdata->session, schedule);
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#else
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memset(schedule, 0, sizeof(schedule));
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#endif
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} else
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rc = krb_recvauth(authopts, 0, ticket, "rcmd",
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instance, &fromaddr,
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(struct sockaddr_in *) 0,
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kdata, "", 0, version);
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if (rc != KSUCCESS) {
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error("Kerberos authentication failure: %s\n",
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krb_get_err_text(rc));
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exit(1);
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}
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} else
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xgetstr(remuser, sizeof(remuser), "remuser");
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xgetstr(locuser, sizeof(locuser), "locuser");
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xgetstr(cmdbuf, sizeof(cmdbuf), "command");
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setpwent();
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pwd = k_getpwnam(locuser);
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if (pwd == NULL) {
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syslog(LOG_INFO|LOG_AUTH,
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"%s@%s as %s: unknown login. cmd='%.80s'",
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remuser, remotehost, locuser, cmdbuf);
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if (errorstr == NULL)
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errorstr = "Login incorrect.\n";
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goto fail;
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}
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if (pwd->pw_uid == 0 && strcmp("root", locuser) != 0)
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{
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syslog(LOG_ALERT, "NIS attack, user %s has uid 0", locuser);
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if (errorstr == NULL)
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errorstr = "Login incorrect.\n";
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goto fail;
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}
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if (chdir(pwd->pw_dir) < 0) {
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chdir("/");
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#ifdef notdef
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syslog(LOG_INFO|LOG_AUTH,
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"%s@%s as %s: no home directory. cmd='%.80s'",
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remuser, remotehost, locuser, cmdbuf);
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error("No remote directory.\n");
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exit(1);
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#endif
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}
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if (use_kerberos) {
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if (pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0') {
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if (kuserok(kdata, locuser) != 0) {
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syslog(LOG_INFO|LOG_AUTH,
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"Kerberos rsh denied to %s",
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krb_unparse_name_long(kdata->pname,
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kdata->pinst,
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kdata->prealm));
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error("Permission denied.\n");
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exit(1);
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}
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}
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} else
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if (errorstr ||
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(pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0' &&
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iruserok(fromp->sin_addr.s_addr, pwd->pw_uid == 0,
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remuser, locuser) < 0)) {
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if (__rcmd_errstr)
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syslog(LOG_INFO|LOG_AUTH,
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"%s@%s as %s: permission denied (%s). cmd='%.80s'",
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remuser, remotehost, locuser,
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__rcmd_errstr, cmdbuf);
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else
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syslog(LOG_INFO|LOG_AUTH,
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"%s@%s as %s: permission denied. cmd='%.80s'",
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remuser, remotehost, locuser, cmdbuf);
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fail:
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if (errorstr == NULL)
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errorstr = "Permission denied.\n";
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error(errorstr, errorhost);
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exit(1);
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}
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if (pwd->pw_uid && !access(_PATH_NOLOGIN, F_OK)) {
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error("Logins currently disabled.\n");
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exit(1);
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}
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write(STDERR_FILENO, "\0", 1);
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sent_null = 1;
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if (port) {
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if (pipe(pv) < 0) {
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error("Can't make pipe.\n");
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exit(1);
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}
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if (doencrypt) {
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if (pipe(pv1) < 0) {
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error("Can't make 2nd pipe.\n");
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exit(1);
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}
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if (pipe(pv2) < 0) {
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error("Can't make 3rd pipe.\n");
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exit(1);
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}
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}
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pid = fork();
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if (pid == -1) {
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error("Can't fork; try again.\n");
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exit(1);
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}
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if (pid) {
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if (doencrypt) {
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static char msg[] = SECURE_MESSAGE;
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close(pv1[1]);
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close(pv2[0]);
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#ifndef NOENCRYPTION
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des_enc_write(s, msg, sizeof(msg) - 1, schedule, &kdata->session);
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#else
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write(s, msg, sizeof(msg) - 1);
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#endif
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} else {
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close(0);
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close(1);
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}
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close(2);
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close(pv[1]);
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FD_ZERO(&readfrom);
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FD_SET(s, &readfrom);
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FD_SET(pv[0], &readfrom);
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if (pv[0] > s)
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nfd = pv[0];
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else
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nfd = s;
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if (doencrypt) {
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FD_ZERO(&writeto);
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FD_SET(pv2[1], &writeto);
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FD_SET(pv1[0], &readfrom);
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FD_SET(STDIN_FILENO, &readfrom);
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nfd = max(nfd, pv2[1]);
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nfd = max(nfd, pv1[0]);
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} else
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ioctl(pv[0], FIONBIO, (char *)&one);
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/* should set s nbio! */
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nfd++;
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do {
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ready = readfrom;
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if (doencrypt) {
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wready = writeto;
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if (select(nfd, &ready,
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&wready, 0,
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(struct timeval *) 0) < 0)
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break;
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} else
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if (select(nfd, &ready, 0,
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0, (struct timeval *)0) < 0)
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break;
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if (FD_ISSET(s, &ready)) {
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int ret;
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if (doencrypt)
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#ifndef NOENCRYPTION
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ret = des_enc_read(s, &sig, 1, schedule, &kdata->session);
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#else
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ret = read(s, &sig, 1);
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#endif
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else
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ret = read(s, &sig, 1);
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if (ret <= 0)
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FD_CLR(s, &readfrom);
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else
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kill(-pid, sig);
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}
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if (FD_ISSET(pv[0], &ready)) {
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errno = 0;
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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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FD_CLR(pv[0], &readfrom);
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} else {
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if (doencrypt)
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#ifndef NOENCRYPTION
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des_enc_write(s, buf, cc, schedule, &kdata->session);
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#else
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write(s, buf, cc);
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#endif
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else
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(void)
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write(s, buf, cc);
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}
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}
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if (doencrypt && FD_ISSET(pv1[0], &ready)) {
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errno = 0;
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cc = read(pv1[0], buf, sizeof(buf));
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if (cc <= 0) {
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shutdown(pv1[0], 1+1);
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FD_CLR(pv1[0], &readfrom);
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} else
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#ifndef NOENCRYPTION
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des_enc_write(STDOUT_FILENO, buf, cc, schedule, &kdata->session);
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#else
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write(STDOUT_FILENO, buf, cc);
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#endif
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}
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if (doencrypt
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&& FD_ISSET(STDIN_FILENO, &ready)
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&& FD_ISSET(pv2[1], &wready)) {
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errno = 0;
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#ifndef NOENCRYPTION
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cc = des_enc_read(STDIN_FILENO, buf, sizeof(buf), schedule, &kdata->session);
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#else
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cc = read(STDIN_FILENO, buf, sizeof(buf));
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#endif
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if (cc <= 0) {
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shutdown(STDIN_FILENO, 0);
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FD_CLR(STDIN_FILENO, &readfrom);
|
|
close(pv2[1]);
|
|
FD_CLR(pv2[1], &writeto);
|
|
} else
|
|
write(pv2[1], buf, cc);
|
|
}
|
|
|
|
} while (FD_ISSET(s, &readfrom) ||
|
|
(doencrypt && FD_ISSET(pv1[0], &readfrom)) ||
|
|
FD_ISSET(pv[0], &readfrom));
|
|
exit(0);
|
|
}
|
|
setsid();
|
|
close(s);
|
|
close(pv[0]);
|
|
if (doencrypt) {
|
|
close(pv1[0]);
|
|
close(pv2[1]);
|
|
dup2(pv1[1], 1);
|
|
dup2(pv2[0], 0);
|
|
close(pv1[1]);
|
|
close(pv2[0]);
|
|
}
|
|
dup2(pv[1], 2);
|
|
close(pv[1]);
|
|
}
|
|
if (*pwd->pw_shell == '\0')
|
|
pwd->pw_shell = _PATH_BSHELL;
|
|
#ifdef HAVE_SETLOGIN
|
|
if (setlogin(pwd->pw_name) < 0)
|
|
syslog(LOG_ERR, "setlogin() failed: %m");
|
|
#endif
|
|
|
|
#ifdef HAVE_SETPCRED
|
|
if (setpcred (pwd->pw_name, NULL) == -1)
|
|
syslog(LOG_ERR, "setpcred() failure: %m");
|
|
#endif /* HAVE_SETPCRED */
|
|
if(do_osfc2_magic(pwd->pw_uid))
|
|
exit(1);
|
|
setgid((gid_t)pwd->pw_gid);
|
|
initgroups(pwd->pw_name, pwd->pw_gid);
|
|
setuid((uid_t)pwd->pw_uid);
|
|
strcat_truncate(homedir, pwd->pw_dir, sizeof(homedir));
|
|
|
|
/* Need to prepend path with BINDIR (/usr/athena/bin) to find rcp */
|
|
snprintf(path, sizeof(path), "PATH=%s:%s", BINDIR, _PATH_DEFPATH);
|
|
|
|
strcat_truncate(shell, pwd->pw_shell, sizeof(shell));
|
|
strcat_truncate(username, pwd->pw_name, sizeof(username));
|
|
cp = strrchr(pwd->pw_shell, '/');
|
|
if (cp)
|
|
cp++;
|
|
else
|
|
cp = pwd->pw_shell;
|
|
endpwent();
|
|
if (log_success || pwd->pw_uid == 0) {
|
|
if (use_kerberos)
|
|
syslog(LOG_INFO|LOG_AUTH,
|
|
"Kerberos shell from %s on %s as %s, cmd='%.80s'",
|
|
krb_unparse_name_long(kdata->pname,
|
|
kdata->pinst,
|
|
kdata->prealm),
|
|
remotehost, locuser, cmdbuf);
|
|
else
|
|
syslog(LOG_INFO|LOG_AUTH, "%s@%s as %s: cmd='%.80s'",
|
|
remuser, remotehost, locuser, cmdbuf);
|
|
}
|
|
if (k_hasafs()) {
|
|
if (new_pag)
|
|
k_setpag(); /* Put users process in an new pag */
|
|
krb_afslog(0, 0);
|
|
}
|
|
execle(pwd->pw_shell, cp, "-c", cmdbuf, 0, envinit);
|
|
err(1, pwd->pw_shell);
|
|
}
|
|
|
|
/*
|
|
* Report error to client. Note: can't be used until second socket has
|
|
* connected to client, or older clients will hang waiting for that
|
|
* connection first.
|
|
*/
|
|
|
|
static void
|
|
error(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int len;
|
|
char *bp, buf[BUFSIZ];
|
|
|
|
va_start(ap, fmt);
|
|
bp = buf;
|
|
if (sent_null == 0) {
|
|
*bp++ = 1;
|
|
len = 1;
|
|
} else
|
|
len = 0;
|
|
len += vsnprintf(bp, sizeof(buf) - len, fmt, ap);
|
|
write(STDERR_FILENO, buf, len);
|
|
va_end(ap);
|
|
}
|
|
|
|
static void
|
|
usage()
|
|
{
|
|
|
|
syslog(LOG_ERR,
|
|
"usage: rshd [-alnkvxLPi] [-p port]");
|
|
exit(2);
|
|
}
|