#include <config.h>
RCSID("$Id$");
#if defined(AUTHENTICATION)
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <signal.h>
#define AUTH_NAMES
#ifdef HAVE_ARPA_TELNET_H
#include <arpa/telnet.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <roken.h>
#ifdef SOCKS
#include <socks.h>
#endif
#include "encrypt.h"
#include "auth.h"
#include "misc-proto.h"
#include "auth-proto.h"
#define typemask(x) (1<<((x)-1))
#ifdef RSA_ENCPWD
extern rsaencpwd_init();
extern rsaencpwd_send();
extern rsaencpwd_is();
extern rsaencpwd_reply();
extern rsaencpwd_status();
extern rsaencpwd_printsub();
#endif
int auth_debug_mode = 0;
int auth_has_failed = 0;
int auth_enable_encrypt = 0;
static const char *Name = "Noname";
static int Server = 0;
static Authenticator *authenticated = 0;
static int authenticating = 0;
static int validuser = 0;
static unsigned char _auth_send_data[256];
static unsigned char *auth_send_data;
static int auth_send_cnt = 0;
Authenticator authenticators[] = {
#ifdef UNSAFE
{ AUTHTYPE_UNSAFE, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
unsafe_init,
unsafe_send,
unsafe_is,
unsafe_reply,
unsafe_status,
unsafe_printsub },
#endif
#ifdef SRA
{ AUTHTYPE_SRA, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
sra_init,
sra_send,
sra_is,
sra_reply,
sra_status,
sra_printsub },
#endif
#ifdef SPX
{ AUTHTYPE_SPX, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
spx_init,
spx_send,
spx_is,
spx_reply,
spx_status,
spx_printsub },
{ AUTHTYPE_SPX, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
spx_init,
spx_send,
spx_is,
spx_reply,
spx_status,
spx_printsub },
#endif
#ifdef KRB5
{ AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
kerberos5_init,
kerberos5_send_mutual,
kerberos5_is,
kerberos5_reply,
kerberos5_status,
kerberos5_printsub },
{ AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
kerberos5_init,
kerberos5_send_oneway,
kerberos5_is,
kerberos5_reply,
kerberos5_status,
kerberos5_printsub },
#endif
#ifdef RSA_ENCPWD
{ AUTHTYPE_RSA_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
rsaencpwd_init,
rsaencpwd_send,
rsaencpwd_is,
rsaencpwd_reply,
rsaencpwd_status,
rsaencpwd_printsub },
#endif
{ 0, },
};
static Authenticator NoAuth = { 0 };
static int i_support = 0;
static int i_wont_support = 0;
Authenticator *
findauthenticator(int type, int way)
{
Authenticator *ap = authenticators;
while (ap->type && (ap->type != type || ap->way != way))
++ap;
return(ap->type ? ap : 0);
}
void
auth_init(const char *name, int server)
{
Authenticator *ap = authenticators;
Server = server;
Name = name;
i_support = 0;
authenticated = 0;
authenticating = 0;
while (ap->type) {
if (!ap->init || (*ap->init)(ap, server)) {
i_support |= typemask(ap->type);
if (auth_debug_mode)
printf(">>>%s: I support auth type %d %d\r\n",
Name,
ap->type, ap->way);
}
else if (auth_debug_mode)
printf(">>>%s: Init failed: auth type %d %d\r\n",
Name, ap->type, ap->way);
++ap;
}
}
void
auth_disable_name(char *name)
{
int x;
for (x = 0; x < AUTHTYPE_CNT; ++x) {
if (!strcasecmp(name, AUTHTYPE_NAME(x))) {
i_wont_support |= typemask(x);
break;
}
}
}
int
getauthmask(char *type, int *maskp)
{
int x;
if (!strcasecmp(type, AUTHTYPE_NAME(0))) {
*maskp = -1;
return(1);
}
for (x = 1; x < AUTHTYPE_CNT; ++x) {
if (!strcasecmp(type, AUTHTYPE_NAME(x))) {
*maskp = typemask(x);
return(1);
}
}
return(0);
}
int
auth_enable(char *type)
{
return(auth_onoff(type, 1));
}
int
auth_disable(char *type)
{
return(auth_onoff(type, 0));
}
int
auth_onoff(char *type, int on)
{
int i, mask = -1;
Authenticator *ap;
if (!strcasecmp(type, "?") || !strcasecmp(type, "help")) {
printf("auth %s 'type'\n", on ? "enable" : "disable");
printf("Where 'type' is one of:\n");
printf("\t%s\n", AUTHTYPE_NAME(0));
mask = 0;
for (ap = authenticators; ap->type; ap++) {
if ((mask & (i = typemask(ap->type))) != 0)
continue;
mask |= i;
printf("\t%s\n", AUTHTYPE_NAME(ap->type));
}
return(0);
}
if (!getauthmask(type, &mask)) {
printf("%s: invalid authentication type\n", type);
return(0);
}
if (on)
i_wont_support &= ~mask;
else
i_wont_support |= mask;
return(1);
}
int
auth_togdebug(int on)
{
if (on < 0)
auth_debug_mode ^= 1;
else
auth_debug_mode = on;
printf("auth debugging %s\n", auth_debug_mode ? "enabled" : "disabled");
return(1);
}
int
auth_status(void)
{
Authenticator *ap;
int i, mask;
if (i_wont_support == -1)
printf("Authentication disabled\n");
else
printf("Authentication enabled\n");
mask = 0;
for (ap = authenticators; ap->type; ap++) {
if ((mask & (i = typemask(ap->type))) != 0)
continue;
mask |= i;
printf("%s: %s\n", AUTHTYPE_NAME(ap->type),
(i_wont_support & typemask(ap->type)) ?
"disabled" : "enabled");
}
return(1);
}
void
auth_request(void)
{
static unsigned char str_request[64] = { IAC, SB,
TELOPT_AUTHENTICATION,
TELQUAL_SEND, };
Authenticator *ap = authenticators;
unsigned char *e = str_request + 4;
if (!authenticating) {
authenticating = 1;
while (ap->type) {
if (i_support & ~i_wont_support & typemask(ap->type)) {
if (auth_debug_mode) {
printf(">>>%s: Sending type %d %d\r\n",
Name, ap->type, ap->way);
}
*e++ = ap->type;
*e++ = ap->way;
}
++ap;
}
*e++ = IAC;
*e++ = SE;
telnet_net_write(str_request, e - str_request);
printsub('>', &str_request[2], e - str_request - 2);
}
}
void
auth_send(unsigned char *data, int cnt)
{
Authenticator *ap;
static unsigned char str_none[] = { IAC, SB, TELOPT_AUTHENTICATION,
TELQUAL_IS, AUTHTYPE_NULL, 0,
IAC, SE };
if (Server) {
if (auth_debug_mode) {
printf(">>>%s: auth_send called!\r\n", Name);
}
return;
}
if (auth_debug_mode) {
printf(">>>%s: auth_send got:", Name);
printd(data, cnt); printf("\r\n");
}
if (data < _auth_send_data ||
data > _auth_send_data + sizeof(_auth_send_data)) {
auth_send_cnt = cnt > sizeof(_auth_send_data)
? sizeof(_auth_send_data)
: cnt;
memmove(_auth_send_data, data, auth_send_cnt);
auth_send_data = _auth_send_data;
} else {
auth_send_data = data;
auth_send_cnt = cnt;
}
while ((auth_send_cnt -= 2) >= 0) {
if (auth_debug_mode)
printf(">>>%s: He supports %d\r\n",
Name, *auth_send_data);
if ((i_support & ~i_wont_support) & typemask(*auth_send_data)) {
ap = findauthenticator(auth_send_data[0],
auth_send_data[1]);
if (ap && ap->send) {
if (auth_debug_mode)
printf(">>>%s: Trying %d %d\r\n",
Name, auth_send_data[0],
auth_send_data[1]);
if ((*ap->send)(ap)) {
if (auth_debug_mode)
printf(">>>%s: Using type %d\r\n",
Name, *auth_send_data);
auth_send_data += 2;
return;
}
}
}
auth_send_data += 2;
}
telnet_net_write(str_none, sizeof(str_none));
printsub('>', &str_none[2], sizeof(str_none) - 2);
if (auth_debug_mode)
printf(">>>%s: Sent failure message\r\n", Name);
auth_finished(0, AUTH_REJECT);
auth_has_failed = 1;
#ifdef KANNAN
printf("Unable to securely authenticate user ... exit\n");
exit(0);
#endif
}
void
auth_send_retry(void)
{
auth_send(auth_send_data, auth_send_cnt);
}
void
auth_is(unsigned char *data, int cnt)
{
Authenticator *ap;
if (cnt < 2)
return;
if (data[0] == AUTHTYPE_NULL) {
auth_finished(0, AUTH_REJECT);
return;
}
if ((ap = findauthenticator(data[0], data[1]))) {
if (ap->is)
(*ap->is)(ap, data+2, cnt-2);
} else if (auth_debug_mode)
printf(">>>%s: Invalid authentication in IS: %d\r\n",
Name, *data);
}
void
auth_reply(unsigned char *data, int cnt)
{
Authenticator *ap;
if (cnt < 2)
return;
if ((ap = findauthenticator(data[0], data[1]))) {
if (ap->reply)
(*ap->reply)(ap, data+2, cnt-2);
} else if (auth_debug_mode)
printf(">>>%s: Invalid authentication in SEND: %d\r\n",
Name, *data);
}
void
auth_name(unsigned char *data, int cnt)
{
char savename[256];
if (cnt < 1) {
if (auth_debug_mode)
printf(">>>%s: Empty name in NAME\r\n", Name);
return;
}
if (cnt > sizeof(savename) - 1) {
if (auth_debug_mode)
printf(">>>%s: Name in NAME (%d) exceeds %lu length\r\n",
Name, cnt, (unsigned long)(sizeof(savename)-1));
return;
}
memmove(savename, data, cnt);
savename[cnt] = '\0';
if (auth_debug_mode)
printf(">>>%s: Got NAME [%s]\r\n", Name, savename);
auth_encrypt_user(savename);
}
int
auth_sendname(unsigned char *cp, int len)
{
static unsigned char str_request[256+6]
= { IAC, SB, TELOPT_AUTHENTICATION, TELQUAL_NAME, };
unsigned char *e = str_request + 4;
unsigned char *ee = &str_request[sizeof(str_request)-2];
while (--len >= 0) {
if ((*e++ = *cp++) == IAC)
*e++ = IAC;
if (e >= ee)
return(0);
}
*e++ = IAC;
*e++ = SE;
telnet_net_write(str_request, e - str_request);
printsub('>', &str_request[2], e - &str_request[2]);
return(1);
}
void
auth_finished(Authenticator *ap, int result)
{
if (!(authenticated = ap))
authenticated = &NoAuth;
validuser = result;
}
static void
auth_intr(int sig)
{
auth_finished(0, AUTH_REJECT);
}
int
auth_wait(char *name, size_t name_sz)
{
if (auth_debug_mode)
printf(">>>%s: in auth_wait.\r\n", Name);
if (Server && !authenticating)
return(0);
signal(SIGALRM, auth_intr);
alarm(30);
while (!authenticated)
if (telnet_spin())
break;
alarm(0);
signal(SIGALRM, SIG_DFL);
if (!authenticated || authenticated == &NoAuth)
return(AUTH_REJECT);
if (validuser == AUTH_VALID)
validuser = AUTH_USER;
if (authenticated->status)
validuser = (*authenticated->status)(authenticated,
name, name_sz,
validuser);
return(validuser);
}
void
auth_debug(int mode)
{
auth_debug_mode = mode;
}
void
auth_printsub(unsigned char *data, size_t cnt,
unsigned char *buf, size_t buflen)
{
Authenticator *ap;
if ((ap = findauthenticator(data[1], data[2])) && ap->printsub)
(*ap->printsub)(data, cnt, buf, buflen);
else
auth_gen_printsub(data, cnt, buf, buflen);
}
void
auth_gen_printsub(unsigned char *data, size_t cnt,
unsigned char *buf, size_t buflen)
{
unsigned char *cp;
unsigned char tbuf[16];
cnt -= 3;
data += 3;
buf[buflen-1] = '\0';
buf[buflen-2] = '*';
buflen -= 2;
for (; cnt > 0; cnt--, data++) {
snprintf((char*)tbuf, sizeof(tbuf), " %d", *data);
for (cp = tbuf; *cp && buflen > 0; --buflen)
*buf++ = *cp++;
if (buflen <= 0)
return;
}
*buf = '\0';
}
#endif