-/* $OpenBSD: rshd.c,v 1.55 2014/04/16 19:03:14 okan Exp $ */
+/* $OpenBSD: rshd.c,v 1.56 2014/04/16 19:14:57 okan Exp $ */
/*-
* Copyright (c) 1988, 1989, 1992, 1993, 1994
char *topdomain(char *);
void usage(void);
-#ifdef KERBEROS
-#include <des.h>
-#include <kerberosIV/krb.h>
-#define VERSION_SIZE 9
-#define SECURE_MESSAGE "This rsh session is using DES encryption for all transmissions.\r\n"
-
-#ifdef CRYPT
-#define OPTIONS "alnkvxL"
-#else
-#define OPTIONS "alnkvL"
-#endif
-
-char authbuf[sizeof(AUTH_DAT)];
-char tickbuf[sizeof(KTEXT_ST)];
-int doencrypt, use_kerberos, vacuous;
-des_key_schedule schedule;
-#ifdef CRYPT
-int des_read(int, char *, int);
-int des_write(int, char *, int);
-void desrw_clear_key();
-void desrw_set_key(des_cblock *, des_key_schedule *);
-#endif
-#else
-#define OPTIONS "alnL"
-#endif
-
#define P_SOCKREAD 0
#define P_PIPEREAD 1
-#define P_CRYPTREAD 2
-#define P_CRYPTWRITE 3
int
main(int argc, char *argv[])
openlog("rshd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
opterr = 0;
- while ((ch = getopt(argc, argv, OPTIONS)) != -1)
+ while ((ch = getopt(argc, argv, "aLln")) != -1)
switch (ch) {
case 'a':
check_all = 1;
break;
+ case 'L':
+ log_success = 1;
+ break;
case 'l':
__check_rhosts_file = 0;
break;
case 'n':
keepalive = 0;
break;
-#ifdef KERBEROS
- case 'k':
- use_kerberos = 1;
- break;
-
- case 'v':
- vacuous = 1;
- break;
-
-#ifdef CRYPT
- case 'x':
- doencrypt = 1;
- break;
-#endif
-#endif
- case 'L':
- log_success = 1;
- break;
case '?':
default:
usage();
argc -= optind;
argv += optind;
-#ifdef KERBEROS
- if (use_kerberos && vacuous) {
- syslog(LOG_ERR, "only one of -k and -v allowed");
- exit(2);
- }
-#ifdef CRYPT
- if (doencrypt && !use_kerberos) {
- syslog(LOG_ERR, "-k is required for -x");
- exit(2);
- }
-#endif
-#endif
-
fromlen = sizeof (from);
if (getpeername(STDIN_FILENO, (struct sockaddr *)&from, &fromlen) < 0) {
/* syslog(LOG_ERR, "getpeername: %m"); */
struct passwd *pwd;
u_short port;
in_port_t *portp;
- struct pollfd pfd[4];
+ struct pollfd pfd[2];
int cc, nfd, pv[2], s = 0, one = 1;
pid_t pid;
char *hostname, *errorstr, *errorhost = (char *) NULL;
auth_session_t *as;
const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
-#ifdef KERBEROS
- AUTH_DAT *kdata = (AUTH_DAT *) NULL;
- KTEXT ticket = (KTEXT) NULL;
- char instance[INST_SZ], version[VERSION_SIZE];
- struct sockaddr_storage fromaddr;
- int rc;
- long authopts;
-#ifdef CRYPT
- int pv1[2], pv2[2];
-#endif
-
- if (sizeof(fromaddr) < fromp->sa_len) {
- syslog(LOG_ERR, "malformed \"from\" address (af %d)",
- fromp->sa_family);
- exit(1);
- }
- memcpy(&fromaddr, fromp, fromp->sa_len);
-#endif
-
(void) signal(SIGINT, SIG_DFL);
(void) signal(SIGQUIT, SIG_DFL);
(void) signal(SIGTERM, SIG_DFL);
}
#endif
-#ifdef KERBEROS
- if (!use_kerberos)
-#endif
- if (ntohs(*portp) >= IPPORT_RESERVED ||
- ntohs(*portp) < IPPORT_RESERVED/2) {
- syslog(LOG_NOTICE|LOG_AUTH,
- "Connection from %s on illegal port %u",
- naddr, ntohs(*portp));
- exit(1);
- }
+ if (ntohs(*portp) >= IPPORT_RESERVED ||
+ ntohs(*portp) < IPPORT_RESERVED/2) {
+ syslog(LOG_NOTICE|LOG_AUTH,
+ "Connection from %s on illegal port %u",
+ naddr, ntohs(*portp));
+ exit(1);
+ }
(void) alarm(60);
port = 0;
(void) alarm(0);
if (port != 0) {
int lport;
-#ifdef KERBEROS
- if (!use_kerberos)
-#endif
- if (port >= IPPORT_RESERVED ||
- port < IPPORT_RESERVED/2) {
- syslog(LOG_ERR, "2nd port not reserved");
- exit(1);
- }
+ if (port >= IPPORT_RESERVED ||
+ port < IPPORT_RESERVED/2) {
+ syslog(LOG_ERR, "2nd port not reserved");
+ exit(1);
+ }
*portp = htons(port);
lport = IPPORT_RESERVED - 1;
s = rresvport_af(&lport, fromp->sa_family);
}
}
-#ifdef KERBEROS
- if (vacuous) {
- error("rshd: remote host requires Kerberos authentication\n");
- exit(1);
- }
-#endif
-
#ifdef notdef
/* from inetd, socket is already on 0, 1, 2 */
dup2(f, 0);
*/
hostname = saddr;
res0 = NULL;
-#ifdef KERBEROS
- if (!use_kerberos)
-#endif
if (check_all || local_domain(saddr)) {
strlcpy(remotehost, saddr, sizeof(remotehost));
errorhost = remotehost;
strlcpy(hostnamebuf, naddr, sizeof(hostnamebuf));
errorhost = hostname = hostnamebuf;
}
-#ifdef KERBEROS
- if (use_kerberos) {
- kdata = (AUTH_DAT *) authbuf;
- ticket = (KTEXT) tickbuf;
- authopts = 0L;
- strlcpy(instance, "*", sizeof instance);
- version[VERSION_SIZE - 1] = '\0';
-#ifdef CRYPT
- if (doencrypt) {
- struct sockaddr_in local_addr;
-
- rc = sizeof(local_addr);
- if (getsockname(STDIN_FILENO,
- (struct sockaddr *)&local_addr, &rc) < 0) {
- syslog(LOG_ERR, "getsockname: %m");
- error("rshd: getsockname: %m");
- exit(1);
- }
- authopts = KOPT_DO_MUTUAL;
- rc = krb_recvauth(authopts, 0, ticket,
- "rcmd", instance, (struct sockaddr_in *)&fromaddr,
- &local_addr, kdata, "", schedule, version);
- desrw_set_key(&kdata->session, &schedule);
- } else
-#endif
- rc = krb_recvauth(authopts, 0, ticket, "rcmd",
- instance, (struct sockaddr_in *)&fromaddr,
- NULL, kdata, "", NULL, version);
- if (rc != KSUCCESS) {
- error("Kerberos authentication failure: %s\n",
- krb_get_err_text(rc));
- exit(1);
- }
- } else
-#endif
getstr(remuser, sizeof(remuser), "remuser");
getstr(locuser, sizeof(locuser), "locuser");
seteuid(0);
setegid(0); /* XXX use a saved gid instead? */
-#ifdef KERBEROS
- if (use_kerberos) {
- if (pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0') {
- if (kuserok(kdata, locuser) != 0) {
- syslog(LOG_INFO|LOG_AUTH,
- "Kerberos rsh denied to %s.%s@%s",
- kdata->pname, kdata->pinst, kdata->prealm);
- error("Permission denied.\n");
- exit(1);
- }
- }
- } else
-#endif
if (errorstr ||
(pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0' &&
iruserok_sa(fromp, fromp->sa_len, pwd->pw_uid == 0,
error("Can't make pipe.\n");
exit(1);
}
-#ifdef CRYPT
-#ifdef KERBEROS
- if (doencrypt) {
- if (pipe(pv1) < 0) {
- error("Can't make 2nd pipe.\n");
- exit(1);
- }
- if (pipe(pv2) < 0) {
- error("Can't make 3rd pipe.\n");
- exit(1);
- }
- }
-#endif
-#endif
pid = fork();
if (pid == -1) {
error("Can't fork; try again.\n");
exit(1);
}
if (pid) {
-#ifdef CRYPT
-#ifdef KERBEROS
- if (doencrypt) {
- static char msg[] = SECURE_MESSAGE;
- (void) close(pv1[1]);
- (void) close(pv2[1]);
- des_write(s, msg, sizeof(msg) - 1);
-
- } else
-#endif
-#endif
- {
- (void) close(STDIN_FILENO);
- (void) close(STDOUT_FILENO);
- }
+ (void) close(STDIN_FILENO);
+ (void) close(STDOUT_FILENO);
(void) close(STDERR_FILENO);
(void) close(pv[1]);
pfd[P_PIPEREAD].fd = pv[0];
pfd[P_PIPEREAD].events = POLLIN;
nfd = 2;
-#ifdef CRYPT
-#ifdef KERBEROS
- if (doencrypt) {
- pfd[P_CRYPTREAD].fd = pv1[0];
- pfd[P_CRYPTREAD].events = POLLIN;
- pfd[P_CRYPTWRITE].fd = pv2[0];
- pfd[P_CRYPTWRITE].events = POLLOUT;
- nfd += 2;
- } else
-#endif
-#endif
- ioctl(pv[0], FIONBIO, (char *)&one);
+ ioctl(pv[0], FIONBIO, (char *)&one);
/* should set s nbio! */
do {
break;
if (pfd[P_SOCKREAD].revents & POLLIN) {
int ret;
-#ifdef CRYPT
-#ifdef KERBEROS
- if (doencrypt)
- ret = des_read(s, &sig, 1);
- else
-#endif
-#endif
- ret = read(s, &sig, 1);
+ ret = read(s, &sig, 1);
if (ret <= 0)
pfd[P_SOCKREAD].revents = 0;
else
shutdown(s, SHUT_RDWR);
pfd[P_PIPEREAD].revents = 0;
} else {
-
-#ifdef CRYPT
-#ifdef KERBEROS
- if (doencrypt)
- (void)
- des_write(s, buf, cc);
- else
-#endif
-#endif
- (void)
- write(s, buf, cc);
+ (void) write(s, buf, cc);
}
}
-#ifdef CRYPT
-#ifdef KERBEROS
- if (doencrypt &&
- (pfd[P_CRYPTREAD].revents & POLLIN)) {
- errno = 0;
- cc = read(pv1[0], buf, sizeof(buf));
- if (cc <= 0) {
- shutdown(pv1[0], SHUT_RDWR);
- pfd[P_CRYPTREAD].revents = 0;
- } else
- (void) des_write(STDOUT_FILENO,
- buf, cc);
- }
-
- if (doencrypt &&
- (pfd[P_CRYPTWRITE].revents & POLLIN)) {
- errno = 0;
- cc = des_read(STDIN_FILENO,
- buf, sizeof(buf));
- if (cc <= 0) {
- shutdown(pv2[0], SHUT_RDWR);
- pfd[P_CRYPTWRITE].revents = 0;
- } else
- (void) write(pv2[0], buf, cc);
- }
-#endif
-#endif
-
} while ((pfd[P_SOCKREAD].revents & POLLIN) ||
-#ifdef CRYPT
-#ifdef KERBEROS
- (doencrypt && (pfd[P_CRYPTREAD].revents & POLLIN)) ||
-#endif
-#endif
(pfd[P_PIPEREAD].revents & POLLIN));
exit(0);
}
setsid();
(void) close(s);
(void) close(pv[0]);
-#ifdef CRYPT
-#ifdef KERBEROS
- if (doencrypt) {
- close(pv1[0]); close(pv2[0]);
- dup2(pv1[1], 1);
- dup2(pv2[1], 0);
- close(pv1[1]);
- close(pv2[1]);
- }
-#endif
-#endif
dup2(pv[1], 2);
close(pv[1]);
} else
cp = pwd->pw_shell;
endpwent();
if (log_success || pwd->pw_uid == 0) {
-#ifdef KERBEROS
- if (use_kerberos)
- syslog(LOG_INFO|LOG_AUTH,
- "Kerberos shell from %s.%s@%s on %s as %s, cmd='%.80s'",
- kdata->pname, kdata->pinst, kdata->prealm,
- hostname, locuser, cmdbuf);
- else
-#endif
- syslog(LOG_INFO|LOG_AUTH, "%s@%s as %s: cmd='%.80s'",
- remuser, hostname, locuser, cmdbuf);
+ syslog(LOG_INFO|LOG_AUTH, "%s@%s as %s: cmd='%.80s'",
+ remuser, hostname, locuser, cmdbuf);
}
execl(pwd->pw_shell, cp, "-c", cmdbuf, (char *)NULL);
perror(pwd->pw_shell);
void
usage(void)
{
-
- syslog(LOG_ERR, "usage: rshd [-%s]", OPTIONS);
+ syslog(LOG_ERR, "usage: rshd [-aLln]");
exit(2);
}
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