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|
/*
* appl/bsd/kcmd.c
*/
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* derived from @(#)rcmd.c 5.17 (Berkeley) 6/27/88 */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <pwd.h>
#include <sys/param.h>
#ifndef _TYPES_
#include <sys/types.h>
#define _TYPES_
#endif
#include <fcntl.h>
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif
#include <signal.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/stat.h>
#ifndef POSIX_SIGNALS
#ifndef sigmask
#define sigmask(m) (1 << ((m)-1))
#endif
#endif
#ifndef roundup
#define roundup(x,y) ((((x)+(y)-1)/(y))*(y))
#endif
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
#include <krb5.h>
#ifdef KRB5_KRB4_COMPAT
#include <kerberosIV/krb.h>
#endif
#include "defines.h"
extern krb5_context bsd_context;
#ifdef KRB5_KRB4_COMPAT
extern Key_schedule v4_schedule;
#endif
#define START_PORT 5120 /* arbitrary */
char *default_service = "host";
#define KCMD_KEYUSAGE 1026
/*
* Note that the encrypted rlogin packets take the form of a four-byte
* length followed by encrypted data. On writing the data out, a significant
* performance penalty is suffered (at least one RTT per character, two if we
* are waiting for a shell to echo) by writing the data separately from the
* length. So, unlike the input buffer, which just contains the output
* data, the output buffer represents the entire packet.
*/
static char des_inbuf[2*RCMD_BUFSIZ]; /* needs to be > largest read size */
static char des_outpkt[2*RCMD_BUFSIZ+4]; /* needs to be > largest write size */
static krb5_data desinbuf;
static krb5_data desoutbuf;
/* XXX Overloaded: use_ivecs!=0 -> new protocol, inband signalling, etc. */
static int use_ivecs;
static krb5_data encivec_i[2], encivec_o[2];
static krb5_keyblock *keyblock; /* key for encrypt/decrypt */
static int (*input)(int, char *, int, int);
static int (*output)(int, char *, int, int);
static char storage[2*RCMD_BUFSIZ]; /* storage for the decryption */
static int nstored = 0;
static char *store_ptr = storage;
static int twrite(int, char *, int, int);
static int v5_des_read(int, char *, int, int),
v5_des_write(int, char *, int, int);
#ifdef KRB5_KRB4_COMPAT
static int v4_des_read(int, char *, int, int),
v4_des_write(int, char *, int, int);
static C_Block v4_session;
static int right_justify;
#endif
static int do_lencheck;
#ifdef KRB5_KRB4_COMPAT
extern int
krb_sendauth(long options, int fd, KTEXT ticket,
char *service, char *inst, char *realm,
unsigned KRB4_32 checksum,
MSG_DAT *msg_data,
CREDENTIALS *cred,
Key_schedule schedule,
struct sockaddr_in *laddr,
struct sockaddr_in *faddr,
char *version);
#endif
int
kcmd(sock, ahost, rport, locuser, remuser, cmd, fd2p, service, realm,
cred, seqno, server_seqno, laddr, faddr, authconp, authopts, anyport,
suppress_err, protonump)
int *sock;
char **ahost;
u_short rport;
char *locuser, *remuser, *cmd;
int *fd2p;
char *service;
char *realm;
krb5_creds **cred; /* output only */
krb5_int32 *seqno;
krb5_int32 *server_seqno;
struct sockaddr_in *laddr, *faddr;
krb5_auth_context *authconp;
krb5_flags authopts;
int anyport;
int suppress_err; /* Don't print if authentication fails */
enum kcmd_proto *protonump;
{
int s, pid;
#ifdef POSIX_SIGNALS
sigset_t oldmask, urgmask;
#else
long oldmask;
#endif
struct sockaddr_in sockin, from, local_laddr;
krb5_creds *get_cred, *ret_cred = 0;
char c;
int lport;
struct hostent *hp;
int rc;
char *host_save;
krb5_error_code status;
krb5_ap_rep_enc_part *rep_ret;
krb5_error *error = 0;
int sin_len;
krb5_ccache cc;
krb5_data outbuf;
krb5_flags options = authopts;
krb5_auth_context auth_context = NULL;
char *cksumbuf;
krb5_data cksumdat;
char *kcmd_version;
enum kcmd_proto protonum = *protonump;
if ((cksumbuf = malloc(strlen(cmd)+strlen(remuser)+64)) == 0 ) {
fprintf(stderr, "Unable to allocate memory for checksum buffer.\n");
return(-1);
}
sprintf(cksumbuf, "%u:", ntohs(rport));
strcat(cksumbuf, cmd);
strcat(cksumbuf, remuser);
cksumdat.data = cksumbuf;
cksumdat.length = strlen(cksumbuf);
pid = getpid();
hp = gethostbyname(*ahost);
if (hp == 0) {
fprintf(stderr, "%s: unknown host\n", *ahost);
return (-1);
}
#ifdef POSIX_SIGNALS
sigemptyset(&urgmask);
sigaddset(&urgmask, SIGURG);
sigprocmask(SIG_BLOCK, &urgmask, &oldmask);
#else
oldmask = sigblock(sigmask(SIGURG));
#endif /* POSIX_SIGNALS */
for (;;) {
s = getport(0);
if (s < 0) {
if (errno == EAGAIN)
fprintf(stderr, "socket: All ports in use\n");
else
perror("kcmd: socket");
#ifdef POSIX_SIGNALS
sigprocmask(SIG_SETMASK, &oldmask, (sigset_t*)0);
#else
sigsetmask(oldmask);
#endif /* POSIX_SIGNALS */
return (-1);
}
sockin.sin_family = hp->h_addrtype;
memcpy((caddr_t)&sockin.sin_addr,hp->h_addr, sizeof(sockin.sin_addr));
sockin.sin_port = rport;
if (connect(s, (struct sockaddr *)&sockin, sizeof (sockin)) >= 0)
break;
(void) close(s);
if (errno == EADDRINUSE)
continue;
#if !(defined(tek) || defined(ultrix) || defined(sun) || defined(SYSV))
if (hp->h_addr_list[1] != NULL) {
int oerrno = errno;
fprintf(stderr,
"connect to address %s: ", inet_ntoa(sockin.sin_addr));
errno = oerrno;
perror(0);
hp->h_addr_list++;
memcpy((caddr_t)&sockin.sin_addr,hp->h_addr_list[0],
sizeof(sockin.sin_addr));
fprintf(stderr, "Trying %s...\n",
inet_ntoa(sockin.sin_addr));
continue;
}
#endif /* !(defined(ultrix) || defined(sun)) */
perror(hp->h_name);
#ifdef POSIX_SIGNALS
sigprocmask(SIG_SETMASK, &oldmask, (sigset_t*)0);
#else
sigsetmask(oldmask);
#endif /* POSIX_SIGNALS */
return (-1);
}
/* If no service is given set to the default service */
if (!service) service = default_service;
if (!(get_cred = (krb5_creds *)calloc(1, sizeof(krb5_creds)))) {
fprintf(stderr,"kcmd: no memory\n");
return(-1);
}
host_save = malloc(strlen(hp->h_name) + 1);
if (host_save == NULL) {
fprintf(stderr, "kcmd: no memory\n");
free(get_cred);
return -1;
}
strcpy(host_save, hp->h_name);
status = krb5_sname_to_principal(bsd_context, host_save, service,
KRB5_NT_SRV_HST, &get_cred->server);
if (status) {
fprintf(stderr, "kcmd: krb5_sname_to_principal failed: %s\n",
error_message(status));
return(-1);
}
if (realm && *realm) {
status = krb5_set_principal_realm(bsd_context, get_cred->server,
realm);
if (status) {
fprintf(stderr, "kcmd: krb5_set_principal_realm failed %s\n",
error_message(status));
return(-1);
}
}
if (fd2p == 0) {
write(s, "", 1);
lport = 0;
} else {
char num[8];
int s2 = getport(&lport), s3;
int len = sizeof (from);
if (s2 < 0) {
status = -1;
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);
status = -1;
goto bad;
}
s3 = accept(s2, (struct sockaddr *)&from, &len);
(void) close(s2);
if (s3 < 0) {
perror("accept");
lport = 0;
status = -1;
goto bad;
}
*fd2p = s3;
from.sin_port = ntohs((u_short)from.sin_port);
if (! anyport &&
(from.sin_family != AF_INET ||
from.sin_port >= IPPORT_RESERVED)) {
fprintf(stderr,
"socket: protocol failure in circuit setup.\n");
goto bad2;
}
}
if (!laddr) laddr = &local_laddr;
if (!faddr) faddr = &sockin;
else
memcpy(faddr,&sockin,sizeof(sockin));
sin_len = sizeof (struct sockaddr_in);
if (getsockname(s, (struct sockaddr *)laddr, &sin_len) < 0) {
perror("getsockname");
status = -1;
goto bad2;
}
status = krb5_cc_default(bsd_context, &cc);
if (status)
goto bad2;
status = krb5_cc_get_principal(bsd_context, cc, &get_cred->client);
if (status) {
(void) krb5_cc_close(bsd_context, cc);
goto bad2;
}
/* Get ticket from credentials cache or kdc */
status = krb5_get_credentials(bsd_context, 0, cc, get_cred, &ret_cred);
krb5_free_creds(bsd_context, get_cred);
(void) krb5_cc_close(bsd_context, cc);
if (status) {
fprintf (stderr, "error getting credentials: %s\n",
error_message (status));
goto bad2;
}
/* Reset internal flags; these should not be sent. */
authopts &= (~OPTS_FORWARD_CREDS);
authopts &= (~OPTS_FORWARDABLE_CREDS);
if (krb5_auth_con_init(bsd_context, &auth_context))
goto bad2;
if (krb5_auth_con_setflags(bsd_context, auth_context,
KRB5_AUTH_CONTEXT_RET_TIME))
goto bad2;
/* Only need local address for mk_cred() to send to krlogind */
status = krb5_auth_con_genaddrs(bsd_context, auth_context, s,
KRB5_AUTH_CONTEXT_GENERATE_LOCAL_FULL_ADDR);
if (status)
goto bad2;
if (protonum == KCMD_PROTOCOL_COMPAT_HACK) {
krb5_boolean is_des;
status = krb5_c_enctype_compare (bsd_context, ENCTYPE_DES_CBC_CRC,
ret_cred->keyblock.enctype, &is_des);
if (status)
goto bad2;
protonum = is_des ? KCMD_OLD_PROTOCOL : KCMD_NEW_PROTOCOL;
}
switch (protonum) {
case KCMD_NEW_PROTOCOL:
authopts |= AP_OPTS_USE_SUBKEY;
kcmd_version = "KCMDV0.2";
break;
case KCMD_OLD_PROTOCOL:
kcmd_version = "KCMDV0.1";
break;
default:
status = EINVAL;
goto bad2;
}
/* Call Kerberos library routine to obtain an authenticator,
pass it over the socket to the server, and obtain mutual
authentication. */
status = krb5_sendauth(bsd_context, &auth_context, (krb5_pointer) &s,
kcmd_version, ret_cred->client, ret_cred->server,
authopts, &cksumdat, ret_cred, 0,
&error, &rep_ret, NULL);
free(cksumbuf);
if (status) {
if (!suppress_err)
fprintf(stderr, "Couldn't authenticate to server: %s\n",
error_message(status));
if (error) {
if (!suppress_err) {
fprintf(stderr, "Server returned error code %d (%s)\n",
error->error,
error_message(ERROR_TABLE_BASE_krb5 + error->error));
if (error->text.length) {
fprintf(stderr, "Error text sent from server: %s\n",
error->text.data);
}
}
krb5_free_error(bsd_context, error);
error = 0;
}
}
if (status) goto bad2;
if (rep_ret && server_seqno) {
*server_seqno = rep_ret->seq_number;
krb5_free_ap_rep_enc_part(bsd_context, rep_ret);
}
(void) write(s, remuser, strlen(remuser)+1);
(void) write(s, cmd, strlen(cmd)+1);
(void) write(s, locuser, strlen(locuser)+1);
if (options & OPTS_FORWARD_CREDS) { /* Forward credentials */
status = krb5_fwd_tgt_creds(bsd_context, auth_context,
host_save,
ret_cred->client, ret_cred->server,
0, options & OPTS_FORWARDABLE_CREDS,
&outbuf);
if (status) {
fprintf(stderr, "kcmd: Error getting forwarded creds\n");
goto bad2;
}
/* Send forwarded credentials */
status = krb5_write_message(bsd_context, (krb5_pointer)&s, &outbuf);
if (status)
goto bad2;
}
else { /* Dummy write to signal no forwarding */
outbuf.length = 0;
status = krb5_write_message(bsd_context, (krb5_pointer)&s, &outbuf);
if (status)
goto bad2;
}
if ((rc=read(s, &c, 1)) != 1) {
if (rc==-1) {
perror(*ahost);
} else {
fprintf(stderr,"kcmd: bad connection with remote host\n");
}
status = -1;
goto bad2;
}
if (c != 0) {
while (read(s, &c, 1) == 1) {
(void) write(2, &c, 1);
if (c == '\n')
break;
}
status = -1;
goto bad2;
}
#ifdef POSIX_SIGNALS
sigprocmask(SIG_SETMASK, &oldmask, (sigset_t*)0);
#else
sigsetmask(oldmask);
#endif /* POSIX_SIGNALS */
*sock = s;
*protonump = protonum;
/* pass back credentials if wanted */
if (cred) krb5_copy_creds(bsd_context, ret_cred, cred);
krb5_free_creds(bsd_context, ret_cred);
if (authconp)
*authconp = auth_context;
return (0);
bad2:
if (lport)
(void) close(*fd2p);
bad:
(void) close(s);
#ifdef POSIX_SIGNALS
sigprocmask(SIG_SETMASK, &oldmask, (sigset_t*)0);
#else
sigsetmask(oldmask);
#endif /* POSIX_SIGNALS */
if (ret_cred)
krb5_free_creds(bsd_context, ret_cred);
return (status);
}
#ifdef KRB5_KRB4_COMPAT
int
k4cmd(sock, ahost, rport, locuser, remuser, cmd, fd2p, ticket, service, realm,
cred, schedule, msg_data, laddr, faddr, authopts, anyport)
int *sock;
char **ahost;
unsigned int rport;
char *locuser, *remuser, *cmd;
int *fd2p;
KTEXT ticket;
char *service;
char *realm;
CREDENTIALS *cred;
Key_schedule schedule;
MSG_DAT *msg_data;
struct sockaddr_in *laddr, *faddr;
long authopts;
int anyport;
{
int s, pid;
#ifdef POSIX_SIGNALS
sigset_t oldmask, urgmask;
#else
sigmasktype oldmask;
#endif
struct sockaddr_in sockin, from;
char c;
int lport = START_PORT;
struct hostent *hp;
int rc, sin_len;
char *host_save;
int status;
pid = getpid();
hp = gethostbyname(*ahost);
if (hp == 0) {
fprintf(stderr, "%s: unknown host\n", *ahost);
return (-1);
}
host_save = malloc(strlen(hp->h_name) + 1);
strcpy(host_save, hp->h_name);
*ahost = host_save;
#ifdef POSIX_SIGNALS
sigemptyset(&urgmask);
sigaddset(&urgmask, SIGURG);
sigprocmask(SIG_BLOCK, &urgmask, &oldmask);
#else
oldmask = sigblock(sigmask(SIGURG));
#endif /* POSIX_SIGNALS */
for (;;) {
s = getport(&lport);
if (s < 0) {
if (errno == EAGAIN)
fprintf(stderr, "socket: All ports in use\n");
else
perror("rcmd: socket");
#ifdef POSIX_SIGNALS
sigprocmask(SIG_SETMASK, &oldmask, (sigset_t*)0);
#else
sigsetmask(oldmask);
#endif /* POSIX_SIGNALS */
return (-1);
}
sockin.sin_family = hp->h_addrtype;
memcpy((caddr_t)&sockin.sin_addr, hp->h_addr, sizeof(sockin.sin_addr));
sockin.sin_port = rport;
if (connect(s, (struct sockaddr *)&sockin, sizeof (sockin)) >= 0)
break;
(void) close(s);
if (errno == EADDRINUSE) {
lport--;
continue;
}
#if !(defined(tex) || defined(ultrix) || defined(sun) || defined(SYSV))
if (hp->h_addr_list[1] != NULL) {
int oerrno = errno;
fprintf(stderr,
"connect to address %s: ", inet_ntoa(sockin.sin_addr));
errno = oerrno;
perror(0);
hp->h_addr_list++;
memcpy((caddr_t)&sockin.sin_addr, hp->h_addr_list[0],
sizeof(sockin.sin_addr));
fprintf(stderr, "Trying %s...\n", inet_ntoa(sockin.sin_addr));
continue;
}
#endif /* !(defined(ultrix) || defined(sun)) */
perror(host_save);
#ifdef POSIX_SIGNALS
sigprocmask(SIG_SETMASK, &oldmask, (sigset_t*)0);
#else
sigsetmask(oldmask);
#endif /* POSIX_SIGNALS */
return (-1);
}
/* If realm is null, look up from table */
if ((realm == NULL) || (realm[0] == '\0')) {
realm = krb_realmofhost(host_save);
}
lport--;
if (fd2p == 0) {
write(s, "", 1);
lport = 0;
} else {
char num[8];
int s2 = getport(&lport), s3;
int len = sizeof (from);
if (s2 < 0) {
status = -1;
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);
status = -1;
goto bad;
}
s3 = accept(s2, (struct sockaddr *)&from, &len);
(void) close(s2);
if (s3 < 0) {
perror("accept");
lport = 0;
status = -1;
goto bad;
}
*fd2p = s3;
from.sin_port = ntohs((u_short)from.sin_port);
/* This check adds nothing when using Kerberos. */
if (! anyport &&
(from.sin_family != AF_INET ||
from.sin_port >= IPPORT_RESERVED)) {
fprintf(stderr, "socket: protocol failure in circuit setup.\n");
status = -1;
goto bad2;
}
}
/* set up the needed stuff for mutual auth */
*faddr = sockin;
sin_len = sizeof (struct sockaddr_in);
if (getsockname(s, (struct sockaddr *)laddr, &sin_len) < 0) {
perror("getsockname");
status = -1;
goto bad2;
}
if ((status = krb_sendauth(authopts, s, ticket, service, *ahost,
realm, (unsigned long) getpid(), msg_data,
cred, schedule,
laddr,
faddr,
"KCMDV0.1")) != KSUCCESS) {
fprintf(stderr, "krb_sendauth failed: %s\n", krb_get_err_text(status));
status = -1;
goto bad2;
}
(void) write(s, remuser, strlen(remuser)+1);
(void) write(s, cmd, strlen(cmd)+1);
reread:
if ((rc=read(s, &c, 1)) != 1) {
if (rc==-1) {
perror(*ahost);
} else {
fprintf(stderr,"rcmd: bad connection with remote host\n");
}
status = -1;
goto bad2;
}
if (c != 0) {
/* If rlogind was compiled on SunOS4, and it somehow
got the shared library version numbers wrong, it
may give an ld.so warning about an old version of a
shared library. Just ignore any such warning.
Note that the warning is a characteristic of the
server; we may not ourselves be running under
SunOS4. */
if (c == 'l') {
char *check = "d.so: warning:";
char *p;
char cc;
p = check;
while (read(s, &c, 1) == 1) {
if (*p == '\0') {
if (c == '\n')
break;
} else {
if (c != *p)
break;
++p;
}
}
if (*p == '\0')
goto reread;
cc = 'l';
(void) write(2, &cc, 1);
if (p != check)
(void) write(2, check, p - check);
}
(void) write(2, &c, 1);
while (read(s, &c, 1) == 1) {
(void) write(2, &c, 1);
if (c == '\n')
break;
}
status = -1;
goto bad2;
}
#ifdef POSIX_SIGNALS
sigprocmask(SIG_SETMASK, &oldmask, (sigset_t*)0);
#else
sigsetmask(oldmask);
#endif
*sock = s;
return (KSUCCESS);
bad2:
if (lport)
(void) close(*fd2p);
bad:
(void) close(s);
#ifdef POSIX_SIGNALS
sigprocmask(SIG_SETMASK, &oldmask, (sigset_t*)0);
#else
sigsetmask(oldmask);
#endif
return (status);
}
#endif /* KRB5_KRB4_COMPAT */
int
getport(alport)
int *alport;
{
struct sockaddr_in sockin;
int s;
int len = sizeof(sockin);
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
return (-1);
memset((char *) &sockin, 0,sizeof(sockin));
sockin.sin_family = AF_INET;
sockin.sin_addr.s_addr = INADDR_ANY;
if (bind(s, (struct sockaddr *)&sockin, sizeof (sockin)) >= 0) {
if (alport) {
if (getsockname(s, (struct sockaddr *)&sockin, &len) < 0) {
(void) close(s);
return -1;
} else {
*alport = ntohs(sockin.sin_port);
}
}
return s;
}
(void) close(s);
return -1;
}
static int
normal_read (int fd, char *buf, int len, int secondary)
{
return read (fd, buf, len);
}
void rcmd_stream_init_normal()
{
input = normal_read;
output = twrite;
}
void rcmd_stream_init_krb5(in_keyblock, encrypt_flag, lencheck, am_client,
protonum)
krb5_keyblock *in_keyblock;
int encrypt_flag;
int lencheck;
int am_client;
enum kcmd_proto protonum;
{
krb5_error_code status;
size_t blocksize;
if (!encrypt_flag) {
rcmd_stream_init_normal();
return;
}
desinbuf.data = des_inbuf;
desoutbuf.data = des_outpkt+4; /* Set up des buffers */
keyblock = in_keyblock;
do_lencheck = lencheck;
input = v5_des_read;
output = v5_des_write;
if (protonum == KCMD_OLD_PROTOCOL) {
use_ivecs = 0;
return;
}
use_ivecs = 1;
status = krb5_c_block_size(bsd_context, keyblock->enctype,
&blocksize);
if (status) {
/* XXX what do I do? */
abort();
}
encivec_i[0].length = encivec_i[1].length = encivec_o[0].length
= encivec_o[1].length = blocksize;
if ((encivec_i[0].data = malloc(encivec_i[0].length * 4)) == NULL) {
/* XXX what do I do? */
abort();
}
encivec_i[1].data = encivec_i[0].data + encivec_i[0].length;
encivec_o[0].data = encivec_i[1].data + encivec_i[0].length;
encivec_o[1].data = encivec_o[0].data + encivec_i[0].length;
/* is there a better way to initialize this? */
memset(encivec_i[0].data, am_client, blocksize);
memset(encivec_o[0].data, 1 - am_client, blocksize);
memset(encivec_i[1].data, 2 | am_client, blocksize);
memset(encivec_o[1].data, 2 | (1 - am_client), blocksize);
}
#ifdef KRB5_KRB4_COMPAT
void rcmd_stream_init_krb4(session, encrypt_flag, lencheck, justify)
C_Block session;
int encrypt_flag;
int lencheck;
int justify;
{
if (!encrypt_flag) {
rcmd_stream_init_normal();
return;
}
do_lencheck = lencheck;
right_justify = justify;
input = v4_des_read;
output = v4_des_write;
memcpy(v4_session, session, sizeof(v4_session));
}
#endif
int rcmd_stream_read(fd, buf, len, sec)
int fd;
register char *buf;
int len;
int sec;
{
return (*input)(fd, buf, len, sec);
}
int rcmd_stream_write(fd, buf, len, sec)
int fd;
register char *buf;
int len;
int sec;
{
return (*output)(fd, buf, len, sec);
}
/* Because of rcp lossage, translate fd 0 to 1 when writing. */
static int twrite(fd, buf, len, secondary)
int fd;
char *buf;
int len;
int secondary;
{
return write((fd == 0) ? 1 : fd, buf, len);
}
static int v5_des_read(fd, buf, len, secondary)
int fd;
char *buf;
int len;
int secondary;
{
int nreturned = 0;
size_t net_len,rd_len;
int cc;
unsigned char c;
krb5_error_code ret;
krb5_data plain;
krb5_enc_data cipher;
if (nstored >= len) {
memcpy(buf, store_ptr, len);
store_ptr += len;
nstored -= len;
return(len);
} else if (nstored) {
memcpy(buf, store_ptr, nstored);
nreturned += nstored;
buf += nstored;
len -= nstored;
nstored = 0;
}
/* See the comment in v4_des_read. */
while (1) {
cc = krb5_net_read(bsd_context, fd, &c, 1);
/* we should check for non-blocking here, but we'd have
to make it save partial reads as well. */
if (cc <= 0) return cc; /* read error */
if (cc == 1) {
if (c == 0 || !do_lencheck) break;
}
}
rd_len = c;
if ((cc = krb5_net_read(bsd_context, fd, &c, 1)) != 1) return 0;
rd_len = (rd_len << 8) | c;
if ((cc = krb5_net_read(bsd_context, fd, &c, 1)) != 1) return 0;
rd_len = (rd_len << 8) | c;
if ((cc = krb5_net_read(bsd_context, fd, &c, 1)) != 1) return 0;
rd_len = (rd_len << 8) | c;
ret = krb5_c_encrypt_length(bsd_context, keyblock->enctype,
use_ivecs ? rd_len + 4 : rd_len,
&net_len);
if (ret) {
errno = ret;
return(-1);
}
if ((net_len <= 0) || (net_len > sizeof(des_inbuf))) {
/* preposterous length, probably out of sync */
errno = EIO;
return(-1);
}
if ((cc = krb5_net_read(bsd_context, fd, desinbuf.data, net_len)) != net_len) {
/* probably out of sync */
errno = EIO;
return(-1);
}
cipher.enctype = ENCTYPE_UNKNOWN;
cipher.ciphertext.length = net_len;
cipher.ciphertext.data = desinbuf.data;
plain.length = sizeof(storage);
plain.data = storage;
/* decrypt info */
ret = krb5_c_decrypt(bsd_context, keyblock, KCMD_KEYUSAGE,
use_ivecs ? encivec_i + secondary : 0,
&cipher, &plain);
if (ret) {
/* probably out of sync */
errno = EIO;
return(-1);
}
store_ptr = storage;
nstored = rd_len;
if (use_ivecs) {
int rd_len2;
rd_len2 = storage[0] & 0xff;
rd_len2 <<= 8; rd_len2 |= storage[1] & 0xff;
rd_len2 <<= 8; rd_len2 |= storage[2] & 0xff;
rd_len2 <<= 8; rd_len2 |= storage[3] & 0xff;
if (rd_len2 != rd_len) {
/* cleartext length trashed? */
errno = EIO;
return -1;
}
store_ptr += 4;
}
if (nstored > len) {
memcpy(buf, store_ptr, len);
nreturned += len;
store_ptr += len;
nstored -= len;
} else {
memcpy(buf, store_ptr, nstored);
nreturned += nstored;
nstored = 0;
}
return(nreturned);
}
static int v5_des_write(fd, buf, len, secondary)
int fd;
char *buf;
int len;
int secondary;
{
krb5_data plain;
krb5_enc_data cipher;
char tmpbuf[2*RCMD_BUFSIZ+8];
unsigned char *len_buf = (unsigned char *) tmpbuf;
if (use_ivecs) {
unsigned char *lenbuf2 = (unsigned char *) tmpbuf;
if (len + 4 > sizeof(tmpbuf))
abort ();
lenbuf2[0] = (len & 0xff000000) >> 24;
lenbuf2[1] = (len & 0xff0000) >> 16;
lenbuf2[2] = (len & 0xff00) >> 8;
lenbuf2[3] = (len & 0xff);
memcpy (tmpbuf + 4, buf, len);
plain.data = tmpbuf;
plain.length = len + 4;
} else {
plain.data = buf;
plain.length = len;
}
cipher.ciphertext.length = sizeof(des_outpkt)-4;
cipher.ciphertext.data = desoutbuf.data;
if (krb5_c_encrypt(bsd_context, keyblock, KCMD_KEYUSAGE,
use_ivecs ? encivec_o + secondary : 0,
&plain, &cipher)) {
errno = EIO;
return(-1);
}
desoutbuf.length = cipher.ciphertext.length;
len_buf = (unsigned char *) des_outpkt;
len_buf[0] = (len & 0xff000000) >> 24;
len_buf[1] = (len & 0xff0000) >> 16;
len_buf[2] = (len & 0xff00) >> 8;
len_buf[3] = (len & 0xff);
if (write(fd, des_outpkt,desoutbuf.length+4) != desoutbuf.length+4){
errno = EIO;
return(-1);
}
else return(len);
}
#ifdef KRB5_KRB4_COMPAT
static int
v4_des_read(fd, buf, len, secondary)
int fd;
char *buf;
int len;
int secondary;
{
int nreturned = 0;
krb5_ui_4 net_len, rd_len;
int cc;
unsigned char c;
if (nstored >= len) {
memcpy(buf, store_ptr, len);
store_ptr += len;
nstored -= len;
return(len);
} else if (nstored) {
memcpy(buf, store_ptr, nstored);
nreturned += nstored;
buf += nstored;
len -= nstored;
nstored = 0;
}
/* We're fetching the length which is MSB first, and the MSB
has to be zero unless the client is sending more than 2^24
(16M) bytes in a single write (which is why this code is used
in rlogin but not rcp or rsh.) The only reasons we'd get
something other than zero are:
-- corruption of the tcp stream (which will show up when
everything else is out of sync too)
-- un-caught Berkeley-style "pseudo out-of-band data" which
happens any time the user hits ^C twice.
The latter is *very* common, as shown by an 'rlogin -x -d'
using the CNS V4 rlogin. Mark EIchin 1/95
*/
while (1) {
cc = krb_net_read(fd, &c, 1);
if (cc <= 0) return cc; /* read error */
if (cc == 1) {
if (c == 0 || !do_lencheck) break;
}
}
net_len = c;
if ((cc = krb_net_read(fd, &c, 1)) != 1) return 0;
net_len = (net_len << 8) | c;
if ((cc = krb_net_read(fd, &c, 1)) != 1) return 0;
net_len = (net_len << 8) | c;
if ((cc = krb_net_read(fd, &c, 1)) != 1) return 0;
net_len = (net_len << 8) | c;
/* Note: net_len is unsigned */
if (net_len > sizeof(des_inbuf)) {
errno = EIO;
return(-1);
}
/* the writer tells us how much real data we are getting, but
we need to read the pad bytes (8-byte boundary) */
rd_len = roundup(net_len, 8);
if ((cc = krb_net_read(fd, des_inbuf, rd_len)) != rd_len) {
errno = EIO;
return(-1);
}
(void) pcbc_encrypt((des_cblock *) des_inbuf,
(des_cblock *) storage,
(net_len < 8) ? 8 : net_len,
v4_schedule,
&v4_session,
DECRYPT);
/*
* when the cleartext block is < 8 bytes, it is "right-justified"
* in the block, so we need to adjust the pointer to the data
*/
if (net_len < 8 && right_justify)
store_ptr = storage + 8 - net_len;
else
store_ptr = storage;
nstored = net_len;
if (nstored > len) {
memcpy(buf, store_ptr, len);
nreturned += len;
store_ptr += len;
nstored -= len;
} else {
memcpy(buf, store_ptr, nstored);
nreturned += nstored;
nstored = 0;
}
return(nreturned);
}
static int
v4_des_write(fd, buf, len, secondary)
int fd;
char *buf;
int len;
int secondary;
{
static char garbage_buf[8];
unsigned char *len_buf = (unsigned char *) des_outpkt;
/*
* pcbc_encrypt outputs in 8-byte (64 bit) increments
*
* it zero-fills the cleartext to 8-byte padding,
* so if we have cleartext of < 8 bytes, we want
* to insert random garbage before it so that the ciphertext
* differs for each transmission of the same cleartext.
* if len < 8 - sizeof(long), sizeof(long) bytes of random
* garbage should be sufficient; leave the rest as-is in the buffer.
* if len > 8 - sizeof(long), just garbage fill the rest.
*/
#ifdef min
#undef min
#endif
#define min(a,b) ((a < b) ? a : b)
if (len < 8 && right_justify) {
krb5_random_confounder(8 - len, garbage_buf);
/* this "right-justifies" the data in the buffer */
(void) memcpy(garbage_buf + 8 - len, buf, len);
}
(void) pcbc_encrypt((des_cblock *) ((len < 8) ? garbage_buf : buf),
(des_cblock *) (des_outpkt+4),
(len < 8) ? 8 : len,
v4_schedule,
&v4_session,
ENCRYPT);
/* tell the other end the real amount, but send an 8-byte padded
packet */
len_buf[0] = (len & 0xff000000) >> 24;
len_buf[1] = (len & 0xff0000) >> 16;
len_buf[2] = (len & 0xff00) >> 8;
len_buf[3] = (len & 0xff);
if (write(fd, des_outpkt, roundup(len,8)+4) != roundup(len,8)+4) {
errno = EIO;
return(-1);
}
return(len);
}
#endif /* KRB5_KRB4_COMPAT */
#ifndef HAVE_STRSAVE
/* Strsave was a routine in the version 4 krb library: we put it here
for compatablilty with version 5 krb library, since kcmd.o is linked
into all programs. */
char *
strsave(sp)
const char *sp;
{
register char *ret;
if((ret = (char *) malloc((unsigned) strlen(sp)+1)) == NULL) {
fprintf(stderr, "no memory for saving args\n");
exit(1);
}
(void) strcpy(ret,sp);
return(ret);
}
#endif
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