53152fc9db
There's not much point in having uucpd behave differently than login(1) for this, and now uucpd is compatible to the default chat script of Taylor UUCP which sends a single \r at first. While i was at it, added a few strategic ``errno = 0;''s, so at least an `Undefined error 0' will be returned for things like a closed connection while reading the login ID or password, as opposed to an even more bogus thing like `No such file or directory'.
282 lines
7.2 KiB
C
282 lines
7.2 KiB
C
/*
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Adams.
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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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1985, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)uucpd.c 8.1 (Berkeley) 6/4/93";
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#endif
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static const char rcsid[] =
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"$Id: uucpd.c,v 1.15 1998/06/30 15:19:51 bde Exp $";
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#endif /* not lint */
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/*
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* 4.2BSD TCP/IP server for uucico
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* uucico's TCP channel causes this server to be run at the remote end.
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <signal.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 <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include <utmp.h>
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#include <sys/param.h>
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#include "pathnames.h"
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#if (MAXLOGNAME-1) > UT_NAMESIZE
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#define LOGNAMESIZE UT_NAMESIZE
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#else
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#define LOGNAMESIZE (MAXLOGNAME-1)
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#endif
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#define SCPYN(a, b) strncpy(a, b, sizeof (a))
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struct sockaddr_in hisctladdr;
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int hisaddrlen = sizeof hisctladdr;
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struct sockaddr_in myctladdr;
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int mypid;
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char Username[64], Logname[64];
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char *nenv[] = {
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Username,
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Logname,
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NULL,
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};
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extern char **environ;
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extern void logwtmp(char *line, char *name, char *host);
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void doit(struct sockaddr_in *sinp);
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void dologout(void);
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int readline(char start[], int num, int passw);
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void dologin(struct passwd *pw, struct sockaddr_in *sin);
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void main(int argc, char **argv)
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{
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environ = nenv;
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close(1); close(2);
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dup(0); dup(0);
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hisaddrlen = sizeof (hisctladdr);
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openlog("uucpd", LOG_PID, LOG_DAEMON);
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if (getpeername(0, (struct sockaddr *)&hisctladdr, &hisaddrlen) < 0) {
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syslog(LOG_ERR, "getpeername: %m");
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_exit(1);
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}
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doit(&hisctladdr);
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dologout();
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exit(0);
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}
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void badlogin(char *name, struct sockaddr_in *sin)
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{
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char remotehost[MAXHOSTNAMELEN];
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struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
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sizeof (struct in_addr), AF_INET);
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if (hp) {
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strncpy(remotehost, hp->h_name, sizeof (remotehost));
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endhostent();
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} else
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strncpy(remotehost, inet_ntoa(sin->sin_addr),
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sizeof (remotehost));
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remotehost[sizeof remotehost - 1] = '\0';
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syslog(LOG_NOTICE, "LOGIN FAILURE FROM %s", remotehost);
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syslog(LOG_AUTHPRIV|LOG_NOTICE,
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"LOGIN FAILURE FROM %s, %s", remotehost, name);
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fprintf(stderr, "Login incorrect.\n");
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exit(1);
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}
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void doit(struct sockaddr_in *sinp)
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{
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char user[64], passwd[64];
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char *xpasswd, *crypt();
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struct passwd *pw;
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pid_t s;
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int pwdok =0;
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alarm(60);
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do {
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printf("login: "); fflush(stdout);
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errno = 0;
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if (readline(user, sizeof user, 0) < 0) {
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syslog(LOG_WARNING, "login read: %m");
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_exit(1);
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}
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} while (user[0] == '\0');
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/* truncate username to LOGNAMESIZE characters */
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user[LOGNAMESIZE] = '\0';
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pw = getpwnam(user);
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/*
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* Fail after password if:
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* 1. Invalid user
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* 2. Shell is not uucico
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* 3. Account has expired
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* 4. Password is incorrect
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*/
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if (pw != NULL && strcmp(pw->pw_shell, _PATH_UUCICO) == 0 &&
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(!pw->pw_expire || time(NULL) >= pw->pw_expire))
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pwdok = 1;
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/* always ask for passwords to deter account guessing */
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if (!pwdok || (pw->pw_passwd && *pw->pw_passwd != '\0')) {
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printf("Password: "); fflush(stdout);
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errno = 0;
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if (readline(passwd, sizeof passwd, 1) < 0) {
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syslog(LOG_WARNING, "passwd read: %m");
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_exit(1);
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}
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if (pwdok) {
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xpasswd = crypt(passwd, pw->pw_passwd);
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if (strcmp(xpasswd, pw->pw_passwd))
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pwdok = 0;
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}
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if (!pwdok)
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badlogin(user, sinp);
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}
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alarm(0);
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sprintf(Username, "USER=%s", pw->pw_name);
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sprintf(Logname, "LOGNAME=%s", pw->pw_name);
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if ((s = fork()) < 0) {
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syslog(LOG_ERR, "fork: %m");
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_exit(1);
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} else if (s == 0) {
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dologin(pw, sinp);
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setgid(pw->pw_gid);
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initgroups(pw->pw_name, pw->pw_gid);
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chdir(pw->pw_dir);
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setuid(pw->pw_uid);
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execl(pw->pw_shell, "uucico", NULL);
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syslog(LOG_ERR, "execl: %m");
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_exit(1);
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}
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}
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int readline(char start[], int num, int passw)
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{
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char c;
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register char *p = start;
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register int n = num;
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while (n-- > 0) {
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if (read(0, &c, 1) <= 0)
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return(-1);
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c &= 0177;
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if (c == '\n' || c == '\r' || c == '\0') {
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if (p == start && passw) {
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n++;
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continue;
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}
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*p = '\0';
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return(0);
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}
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if (c == 025) {
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n = num;
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p = start;
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continue;
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}
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*p++ = c;
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}
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return(-1);
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}
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void dologout(void)
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{
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union wait status;
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pid_t pid;
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char line[32];
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while ((pid=wait((int *)&status)) > 0) {
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sprintf(line, "uucp%ld", (long)pid);
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logwtmp(line, "", "");
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}
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}
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/*
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* Record login in wtmp file.
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*/
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void dologin(struct passwd *pw, struct sockaddr_in *sin)
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{
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char line[32];
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char remotehost[MAXHOSTNAMELEN];
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int f;
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time_t cur_time;
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struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
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sizeof (struct in_addr), AF_INET);
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if (hp) {
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strncpy(remotehost, hp->h_name, sizeof (remotehost));
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endhostent();
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} else
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strncpy(remotehost, inet_ntoa(sin->sin_addr),
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sizeof (remotehost));
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remotehost[sizeof remotehost - 1] = '\0';
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/* hack, but must be unique and no tty line */
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sprintf(line, "uucp%ld", (long)getpid());
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time(&cur_time);
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if ((f = open(_PATH_LASTLOG, O_RDWR)) >= 0) {
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struct lastlog ll;
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ll.ll_time = cur_time;
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lseek(f, (off_t)pw->pw_uid * sizeof(struct lastlog), L_SET);
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SCPYN(ll.ll_line, line);
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SCPYN(ll.ll_host, remotehost);
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(void) write(f, (char *) &ll, sizeof ll);
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(void) close(f);
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}
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logwtmp(line, pw->pw_name, remotehost);
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}
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