352 lines
8.4 KiB
C
352 lines
8.4 KiB
C
/*
|
|
* Copyright (c) 1983 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)rcmd.c 5.24 (Berkeley) 2/24/91";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <signal.h>
|
|
#include <fcntl.h>
|
|
#include <netdb.h>
|
|
#include <pwd.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
|
|
char **ahost;
|
|
u_short rport;
|
|
const char *locuser, *remuser, *cmd;
|
|
int *fd2p;
|
|
{
|
|
int s, timo = 1, pid;
|
|
long oldmask;
|
|
struct sockaddr_in sin, sin2, from;
|
|
char c;
|
|
int lport = IPPORT_RESERVED - 1;
|
|
struct hostent *hp;
|
|
fd_set reads;
|
|
|
|
pid = getpid();
|
|
hp = gethostbyname(*ahost);
|
|
if (hp == 0) {
|
|
herror(*ahost);
|
|
return (-1);
|
|
}
|
|
*ahost = hp->h_name;
|
|
oldmask = sigblock(sigmask(SIGURG));
|
|
for (;;) {
|
|
s = rresvport(&lport);
|
|
if (s < 0) {
|
|
if (errno == EAGAIN)
|
|
fprintf(stderr, "socket: All ports in use\n");
|
|
else
|
|
perror("rcmd: socket");
|
|
sigsetmask(oldmask);
|
|
return (-1);
|
|
}
|
|
fcntl(s, F_SETOWN, pid);
|
|
sin.sin_family = hp->h_addrtype;
|
|
bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length);
|
|
sin.sin_port = rport;
|
|
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
|
|
break;
|
|
(void) close(s);
|
|
if (errno == EADDRINUSE) {
|
|
lport--;
|
|
continue;
|
|
}
|
|
if (errno == ECONNREFUSED && timo <= 16) {
|
|
sleep(timo);
|
|
timo *= 2;
|
|
continue;
|
|
}
|
|
if (hp->h_addr_list[1] != NULL) {
|
|
int oerrno = errno;
|
|
|
|
fprintf(stderr,
|
|
"connect to address %s: ", inet_ntoa(sin.sin_addr));
|
|
errno = oerrno;
|
|
perror(0);
|
|
hp->h_addr_list++;
|
|
bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr,
|
|
hp->h_length);
|
|
fprintf(stderr, "Trying %s...\n",
|
|
inet_ntoa(sin.sin_addr));
|
|
continue;
|
|
}
|
|
perror(hp->h_name);
|
|
sigsetmask(oldmask);
|
|
return (-1);
|
|
}
|
|
lport--;
|
|
if (fd2p == 0) {
|
|
write(s, "", 1);
|
|
lport = 0;
|
|
} else {
|
|
char num[8];
|
|
int s2 = rresvport(&lport), s3;
|
|
int len = sizeof (from);
|
|
|
|
if (s2 < 0)
|
|
goto bad;
|
|
listen(s2, 1);
|
|
(void) sprintf(num, "%d", lport);
|
|
if (write(s, num, strlen(num)+1) != strlen(num)+1) {
|
|
perror("write: setting up stderr");
|
|
(void) close(s2);
|
|
goto bad;
|
|
}
|
|
FD_ZERO(&reads);
|
|
FD_SET(s, &reads);
|
|
FD_SET(s2, &reads);
|
|
errno = 0;
|
|
if (select(32, &reads, 0, 0, 0) < 1 ||
|
|
!FD_ISSET(s2, &reads)) {
|
|
if (errno != 0)
|
|
perror("select: setting up stderr");
|
|
else
|
|
fprintf(stderr,
|
|
"select: protocol failure in circuit setup.\n");
|
|
(void) close(s2);
|
|
goto bad;
|
|
}
|
|
s3 = accept(s2, (struct sockaddr *)&from, &len);
|
|
(void) close(s2);
|
|
if (s3 < 0) {
|
|
perror("accept");
|
|
lport = 0;
|
|
goto bad;
|
|
}
|
|
*fd2p = s3;
|
|
from.sin_port = ntohs((u_short)from.sin_port);
|
|
if (from.sin_family != AF_INET ||
|
|
from.sin_port >= IPPORT_RESERVED ||
|
|
from.sin_port < IPPORT_RESERVED / 2) {
|
|
fprintf(stderr,
|
|
"socket: protocol failure in circuit setup.\n");
|
|
goto bad2;
|
|
}
|
|
}
|
|
(void) write(s, locuser, strlen(locuser)+1);
|
|
(void) write(s, remuser, strlen(remuser)+1);
|
|
(void) write(s, cmd, strlen(cmd)+1);
|
|
if (read(s, &c, 1) != 1) {
|
|
perror(*ahost);
|
|
goto bad2;
|
|
}
|
|
if (c != 0) {
|
|
while (read(s, &c, 1) == 1) {
|
|
(void) write(2, &c, 1);
|
|
if (c == '\n')
|
|
break;
|
|
}
|
|
goto bad2;
|
|
}
|
|
sigsetmask(oldmask);
|
|
return (s);
|
|
bad2:
|
|
if (lport)
|
|
(void) close(*fd2p);
|
|
bad:
|
|
(void) close(s);
|
|
sigsetmask(oldmask);
|
|
return (-1);
|
|
}
|
|
|
|
rresvport(alport)
|
|
int *alport;
|
|
{
|
|
struct sockaddr_in sin;
|
|
int s;
|
|
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_addr.s_addr = INADDR_ANY;
|
|
s = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (s < 0)
|
|
return (-1);
|
|
for (;;) {
|
|
sin.sin_port = htons((u_short)*alport);
|
|
if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
|
|
return (s);
|
|
if (errno != EADDRINUSE) {
|
|
(void) close(s);
|
|
return (-1);
|
|
}
|
|
(*alport)--;
|
|
if (*alport == IPPORT_RESERVED/2) {
|
|
(void) close(s);
|
|
errno = EAGAIN; /* close */
|
|
return (-1);
|
|
}
|
|
}
|
|
}
|
|
|
|
int _check_rhosts_file = 1;
|
|
|
|
ruserok(rhost, superuser, ruser, luser)
|
|
const char *rhost, *ruser, *luser;
|
|
int superuser;
|
|
{
|
|
FILE *hostf;
|
|
char fhost[MAXHOSTNAMELEN];
|
|
int first = 1;
|
|
register char *sp, *p;
|
|
int baselen = -1;
|
|
|
|
sp = (char *)rhost;
|
|
p = fhost;
|
|
while (*sp) {
|
|
if (*sp == '.') {
|
|
if (baselen == -1)
|
|
baselen = sp - rhost;
|
|
*p++ = *sp++;
|
|
} else {
|
|
*p++ = isupper(*sp) ? tolower(*sp++) : *sp++;
|
|
}
|
|
}
|
|
*p = '\0';
|
|
hostf = superuser ? (FILE *)0 : fopen(_PATH_HEQUIV, "r");
|
|
again:
|
|
if (hostf) {
|
|
if (!_validuser(hostf, fhost, luser, ruser, baselen)) {
|
|
(void) fclose(hostf);
|
|
return(0);
|
|
}
|
|
(void) fclose(hostf);
|
|
}
|
|
if (first == 1 && (_check_rhosts_file || superuser)) {
|
|
struct stat sbuf;
|
|
struct passwd *pwd;
|
|
char pbuf[MAXPATHLEN];
|
|
|
|
first = 0;
|
|
if ((pwd = getpwnam(luser)) == NULL)
|
|
return(-1);
|
|
(void)strcpy(pbuf, pwd->pw_dir);
|
|
(void)strcat(pbuf, "/.rhosts");
|
|
if ((hostf = fopen(pbuf, "r")) == NULL)
|
|
return(-1);
|
|
/*
|
|
* if owned by someone other than user or root or if
|
|
* writeable by anyone but the owner, quit
|
|
*/
|
|
if (fstat(fileno(hostf), &sbuf) ||
|
|
sbuf.st_uid && sbuf.st_uid != pwd->pw_uid ||
|
|
sbuf.st_mode&022) {
|
|
fclose(hostf);
|
|
return(-1);
|
|
}
|
|
goto again;
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
/* don't make static, used by lpd(8) */
|
|
_validuser(hostf, rhost, luser, ruser, baselen)
|
|
char *rhost, *luser, *ruser;
|
|
FILE *hostf;
|
|
int baselen;
|
|
{
|
|
register char *p;
|
|
char *user, ahost[MAXHOSTNAMELEN];
|
|
static int _checkhost();
|
|
|
|
while (fgets(ahost, sizeof (ahost), hostf)) {
|
|
p = ahost;
|
|
while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
|
|
*p = isupper(*p) ? tolower(*p) : *p;
|
|
p++;
|
|
}
|
|
if (*p == ' ' || *p == '\t') {
|
|
*p++ = '\0';
|
|
while (*p == ' ' || *p == '\t')
|
|
p++;
|
|
user = p;
|
|
while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0')
|
|
p++;
|
|
} else
|
|
user = p;
|
|
*p = '\0';
|
|
if (_checkhost(rhost, ahost, baselen) &&
|
|
!strcmp(ruser, *user ? user : luser)) {
|
|
return (0);
|
|
}
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
static
|
|
_checkhost(rhost, lhost, len)
|
|
char *rhost, *lhost;
|
|
int len;
|
|
{
|
|
static char ldomain[MAXHOSTNAMELEN + 1];
|
|
static char *domainp = NULL;
|
|
static int nodomain = 0;
|
|
register char *cp;
|
|
|
|
if (len == -1)
|
|
return(!strcmp(rhost, lhost));
|
|
if (strncmp(rhost, lhost, len))
|
|
return(0);
|
|
if (!strcmp(rhost, lhost))
|
|
return(1);
|
|
if (*(lhost + len) != '\0')
|
|
return(0);
|
|
if (nodomain)
|
|
return(0);
|
|
if (!domainp) {
|
|
if (gethostname(ldomain, sizeof(ldomain)) == -1) {
|
|
nodomain = 1;
|
|
return(0);
|
|
}
|
|
ldomain[MAXHOSTNAMELEN] = NULL;
|
|
if ((domainp = index(ldomain, '.')) == (char *)NULL) {
|
|
nodomain = 1;
|
|
return(0);
|
|
}
|
|
for (cp = ++domainp; *cp; ++cp)
|
|
if (isupper(*cp))
|
|
*cp = tolower(*cp);
|
|
}
|
|
return(!strcmp(domainp, rhost + len +1));
|
|
}
|