NetBSD/libexec/uucpd/uucpd.c

321 lines
7.6 KiB
C

/* $NetBSD: uucpd.c,v 1.20 2003/03/03 19:05:09 dsl Exp $ */
/*
* Copyright (c) 1985 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Adams.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1985 The Regents of the University of California.\n\
All rights reserved.\n");
#if 0
static char sccsid[] = "from: @(#)uucpd.c 5.10 (Berkeley) 2/26/91";
#else
__RCSID("$NetBSD: uucpd.c,v 1.20 2003/03/03 19:05:09 dsl Exp $");
#endif
#endif /* not lint */
/*
* 4.2BSD TCP/IP server for uucico
* uucico's TCP channel causes this server to be run at the remote end.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <util.h>
#include <time.h>
#ifdef SUPPORT_UTMP
#include <utmp.h>
#endif
#ifdef SUPPORT_UTMPX
#include <utmpx.h>
#endif
#include "pathnames.h"
struct sockaddr_storage hisctladdr;
int hisaddrlen = sizeof hisctladdr;
int mypid;
char Logname[64], Username[64];
char *nenv[] = {
Logname,
Username,
NULL,
};
int dolog;
extern char **environ;
void dologout __P((void));
void dologin __P((struct passwd *, struct sockaddr *));
void doit __P((struct sockaddr *));
int readline __P((char *, int));
int main __P((int, char **));
int
main(argc, argv)
int argc;
char **argv;
{
int ch;
while ((ch = getopt(argc, argv, "l")) != -1)
switch (ch) {
case 'l':
dolog = 1;
break;
default:
exit(1);
}
if (dolog)
openlog("uucpd", LOG_PID, LOG_AUTH);
environ = nenv;
close(1);
close(2);
dup(0);
dup(0);
hisaddrlen = sizeof (hisctladdr);
if (getpeername(0, (struct sockaddr *)&hisctladdr, &hisaddrlen) < 0) {
fprintf(stderr, "%s: ", argv[0]);
perror("getpeername");
if (dolog)
syslog(LOG_ERR, "getpeername failed: %m");
exit(1);
}
switch (fork()) {
case -1:
break;
case 0:
doit((struct sockaddr *)&hisctladdr);
break;
default:
dologout();
}
exit(1);
}
void
doit(sa)
struct sockaddr *sa;
{
char user[64], passwd[64];
char *xpasswd = NULL; /* XXX gcc */
struct passwd *pw;
alarm(60);
do {
printf("login: ");
fflush(stdout);
if (readline(user, sizeof user) < 0) {
fprintf(stderr, "user read\n");
if (dolog)
syslog(LOG_ERR, "user read failed: %m");
return;
}
} while (user[0] == '\0');
/* ensure username is NUL-terminated */
user[sizeof(user)-1] = '\0';
pw = getpwnam(user);
if (pw == NULL || (pw->pw_passwd && *pw->pw_passwd != '\0')) {
printf("Password: ");
fflush(stdout);
if (readline(passwd, sizeof passwd) < 0) {
fprintf(stderr, "passwd read\n");
if (dolog)
syslog(LOG_ERR, "passwd read failed: %m");
return;
}
if (pw != NULL)
xpasswd = crypt(passwd, pw->pw_passwd);
if (pw == NULL || strcmp(xpasswd, pw->pw_passwd)) {
fprintf(stderr, "Login incorrect.\n");
if (dolog)
syslog(LOG_ERR, "incorrect password from %s",
user);
return;
}
} else
(void)crypt("dummy password", "PA"); /* must always crypt */
if (strcmp(pw->pw_shell, _PATH_UUCICO)) {
fprintf(stderr, "Login incorrect.\n");
if (dolog)
syslog(LOG_ERR, "incorrect shell for %s", user);
return;
}
alarm(0);
sprintf(Logname, "LOGNAME=%s", user);
sprintf(Username, "USER=%s", user);
dologin(pw, sa);
if (initgroups(pw->pw_name, pw->pw_gid) < 0 ||
setgid(pw->pw_gid) < 0 ||
chdir(pw->pw_dir) < 0 ||
setsid() < 0 ||
setlogin(user) < 0 ||
setuid(pw->pw_uid) < 0) {
fprintf(stderr, "Could not set permissions.\n");
if (dolog)
syslog(LOG_ERR,"couldn't set user %s's permissions: %m",
user);
return;
}
if (dolog)
syslog(LOG_INFO, "%s has logged in", user);
execl(_PATH_UUCICO, "uucico", (char *)0);
perror("uucico server: execl");
if (dolog)
syslog(LOG_ERR, "execl failed: %m");
}
int
readline(p, n)
char *p;
int n;
{
char c;
while (n-- > 0) {
if (read(0, &c, 1) <= 0)
return(-1);
c &= 0177;
if (c == '\r') {
*p = '\0';
return(0);
}
if (c != '\n')
*p++ = c;
}
return (-1);
}
/* Note that SCPYN is only used on strings that may not be nul terminated */
#define SCPYN(a, b) strncpy(a, b, sizeof (a))
#ifdef SUPPORT_UTMP
struct utmp utmp;
#endif
#ifdef SUPPORT_UTMPX
struct utmpx utmpx;
#endif
void
dologout()
{
#if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
int status;
char line[MAXPATHLEN];
pid_t pid;
while ((pid = wait(&status)) > 0) {
sprintf(line, "uucp%.4d", pid);
#ifdef SUPPORT_UTMPX
if (logoutx(line, status, DEAD_PROCESS))
logwtmpx(line, "", "", status, DEAD_PROCESS);
#endif
#ifdef SUPPORT_UTMP
if (logout(line))
logwtmp(line, "", "");
#endif
}
#endif
}
/*
* Record login in wtmp file.
*/
void
dologin(pw, sa)
struct passwd *pw;
struct sockaddr *sa;
{
#if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
char hbuf[NI_MAXHOST];
struct timeval tv;
char line[MAXPATHLEN];
pid_t pid = getpid();
/* hack, but must be unique and no tty line */
sprintf(line, "uucp%.4d", pid = getpid());
(void)gettimeofday(&tv, NULL);
if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0))
(void)strcpy(hbuf, "?");
#endif
#ifdef SUPPORT_UTMPX
SCPYN(utmpx.ut_line, line);
SCPYN(utmpx.ut_name, pw->pw_name);
SCPYN(utmpx.ut_host, hbuf);
if (strlen(line) > sizeof(utmpx.ut_id)) {
SCPYN(utmpx.ut_id, line + strlen(line) - sizeof(utmpx.ut_id));
} else {
SCPYN(utmpx.ut_id, line);
}
utmpx.ut_tv = tv;
utmpx.ut_type = USER_PROCESS;
utmpx.ut_pid = pid;
(void)memcpy(&utmpx.ut_ss, sa, sizeof(*sa));
loginx(&utmpx);
logwtmpx(line, pw->pw_name, hbuf, 0, USER_PROCESS);
#endif
#ifdef SUPPORT_UTMP
SCPYN(utmp.ut_line, line);
SCPYN(utmp.ut_name, pw->pw_name);
SCPYN(utmp.ut_host, hbuf);
utmp.ut_time = (time_t)tv.tv_sec;
login(&utmp);
logwtmp(line, pw->pw_name, hbuf);
#endif
}