Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/crypto/dist/ssh/auth1.c

438 lines
11 KiB
C
Raw Blame History

/* $NetBSD: auth1.c,v 1.12 2001/05/15 14:50:49 itojun Exp $ */
/*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*/
#include "includes.h"
RCSID("$OpenBSD: auth1.c,v 1.22 2001/03/23 12:02:49 markus Exp $");
#include "xmalloc.h"
#include "rsa.h"
#include "ssh1.h"
#include "packet.h"
#include "buffer.h"
#include "mpaux.h"
#include "log.h"
#include "servconf.h"
#include "compat.h"
#include "auth.h"
#include "session.h"
#include "misc.h"
#ifdef KRB5
extern krb5_context ssh_context;
krb5_principal tkt_client = NULL; /* Principal from the received ticket.
Also is used as an indication of succesful krb5 authentization. */
#endif
#if defined(KRB4) || defined(KRB5)
int ssh_krb_auth; /* 4 or 5 indicates krb version we authenticated with */
char *ssh_krb_user;
#endif
/* import */
extern ServerOptions options;
/* prototype */
char *get_authname(int);
void do_authloop(Authctxt *);
/*
* convert ssh auth msg type into description
*/
char *
get_authname(int type)
{
static char buf[1024];
switch (type) {
case SSH_CMSG_AUTH_PASSWORD:
return "password";
case SSH_CMSG_AUTH_RSA:
return "rsa";
case SSH_CMSG_AUTH_RHOSTS_RSA:
return "rhosts-rsa";
case SSH_CMSG_AUTH_RHOSTS:
return "rhosts";
case SSH_CMSG_AUTH_TIS:
case SSH_CMSG_AUTH_TIS_RESPONSE:
return "challenge-response";
#if defined(KRB4) || defined(KRB5)
case SSH_CMSG_AUTH_KERBEROS:
return "kerberos";
#endif
}
snprintf(buf, sizeof buf, "bad-auth-msg-%d", type);
return buf;
}
/*
* read packets, try to authenticate the user and
* return only if authentication is successful
*/
void
do_authloop(Authctxt *authctxt)
{
int authenticated = 0;
u_int bits;
RSA *client_host_key;
BIGNUM *n;
char *client_user, *password;
char info[1024];
u_int dlen;
int plen, nlen, elen;
u_int ulen;
int type = 0;
struct passwd *pw = authctxt->pw;
debug("Attempting authentication for %s%.100s.",
authctxt->valid ? "" : "illegal user ", authctxt->user);
/* If the user has no password, accept authentication immediately. */
if (options.password_authentication &&
#ifdef KRB5
!options.kerberos_authentication &&
#endif /* KRB5 */
#ifdef KRB4
(!options.kerberos_authentication || options.krb4_or_local_passwd) &&
#endif /* KRB4 */
auth_password(authctxt, "")) {
auth_log(authctxt, 1, "without authentication", "");
return;
}
/* Indicate that authentication is needed. */
packet_start(SSH_SMSG_FAILURE);
packet_send();
packet_write_wait();
for (;;) {
/* default to fail */
authenticated = 0;
info[0] = '\0';
/* Get a packet from the client. */
type = packet_read(&plen);
/* Process the packet. */
switch (type) {
#ifdef AFS
#ifndef KRB5
case SSH_CMSG_HAVE_KERBEROS_TGT:
if (!options.krb4_tgt_passing) {
verbose("Kerberos v4 tgt passing disabled.");
break;
} else {
/* Accept Kerberos v4 tgt. */
char *tgt = packet_get_string(&dlen);
packet_integrity_check(plen, 4 + dlen, type);
if (!auth_krb4_tgt(pw, tgt))
verbose("Kerberos v4 tgt REFUSED for %.100s", authctxt->user);
xfree(tgt);
}
continue;
#endif /* !KRB5 */
case SSH_CMSG_HAVE_AFS_TOKEN:
if (!options.afs_token_passing || !k_hasafs()) {
verbose("AFS token passing disabled.");
break;
} else {
/* Accept AFS token. */
char *token_string = packet_get_string(&dlen);
packet_integrity_check(plen, 4 + dlen, type);
if (!auth_afs_token(pw, token_string))
verbose("AFS token REFUSED for %.100s", authctxt->user);
xfree(token_string);
}
continue;
#endif /* AFS */
#if defined(KRB4) || defined(KRB5)
case SSH_CMSG_AUTH_KERBEROS:
if (!options.kerberos_authentication) {
verbose("Kerberos authentication disabled.");
break;
} else {
unsigned int length;
char *kdata = packet_get_string(&length);
packet_integrity_check(plen, 4 + length, type);
/* 4 == KRB_PROT_VERSION */
if (kdata[0] == 4) {
#ifndef KRB4
verbose("Kerberos v4 authentication disabled.");
#else
/* Try Kerberos v4 authentication. */
KTEXT_ST auth;
char *tkt_user = NULL;
auth.length = length;
if (authctxt->valid) {
if (auth.length < MAX_KTXT_LEN)
memcpy(auth.dat, kdata, auth.length);
authenticated = auth_krb4(pw->pw_name, &auth, &tkt_user);
if (authenticated) {
ssh_krb_auth = 4;
ssh_krb_user = strdup(authctxt->user);
snprintf(info, sizeof info,
" tktuser %.100s", tkt_user);
xfree(tkt_user);
}
}
#endif /* KRB4 */
} else {
#ifndef KRB5
verbose("Kerberos v5 authentication disabled.");
#else
krb5_data k5data;
k5data.length = length;
k5data.data = kdata;
#if 0
if (krb5_init_context(&ssh_context)) {
verbose("Error while initializing Kerberos V5.");
break;
}
krb5_init_ets(ssh_context);
#endif
/* pw->name is passed just for logging purposes */
if (authctxt->valid
&& auth_krb5(pw->pw_name, &k5data, &tkt_client)) {
/* authorize client against .k5login */
if (krb5_kuserok(ssh_context,
tkt_client,
pw->pw_name)) {
ssh_krb_user =
strdup(authctxt->user);
ssh_krb_auth = 5;
authenticated = 1;
}
}
#endif /* KRB5 */
}
xfree(kdata);
}
break;
#endif /* KRB4 || KRB5 */
case SSH_CMSG_AUTH_RHOSTS:
if (!options.rhosts_authentication) {
verbose("Rhosts authentication disabled.");
break;
}
/*
* Get client user name. Note that we just have to
* trust the client; this is one reason why rhosts
* authentication is insecure. (Another is
* IP-spoofing on a local network.)
*/
client_user = packet_get_string(&ulen);
packet_integrity_check(plen, 4 + ulen, type);
/* Try to authenticate using /etc/hosts.equiv and .rhosts. */
authenticated = auth_rhosts(pw, client_user);
snprintf(info, sizeof info, " ruser %.100s", client_user);
xfree(client_user);
break;
case SSH_CMSG_AUTH_RHOSTS_RSA:
if (!options.rhosts_rsa_authentication) {
verbose("Rhosts with RSA authentication disabled.");
break;
}
/*
* Get client user name. Note that we just have to
* trust the client; root on the client machine can
* claim to be any user.
*/
client_user = packet_get_string(&ulen);
/* Get the client host key. */
client_host_key = RSA_new();
if (client_host_key == NULL)
fatal("RSA_new failed");
client_host_key->e = BN_new();
client_host_key->n = BN_new();
if (client_host_key->e == NULL || client_host_key->n == NULL)
fatal("BN_new failed");
bits = packet_get_int();
packet_get_bignum(client_host_key->e, &elen);
packet_get_bignum(client_host_key->n, &nlen);
if (bits != BN_num_bits(client_host_key->n))
verbose("Warning: keysize mismatch for client_host_key: "
"actual %d, announced %d", BN_num_bits(client_host_key->n), bits);
packet_integrity_check(plen, (4 + ulen) + 4 + elen + nlen, type);
authenticated = auth_rhosts_rsa(pw, client_user, client_host_key);
RSA_free(client_host_key);
snprintf(info, sizeof info, " ruser %.100s", client_user);
xfree(client_user);
break;
case SSH_CMSG_AUTH_RSA:
if (!options.rsa_authentication) {
verbose("RSA authentication disabled.");
break;
}
/* RSA authentication requested. */
n = BN_new();
packet_get_bignum(n, &nlen);
packet_integrity_check(plen, nlen, type);
authenticated = auth_rsa(pw, n);
BN_clear_free(n);
break;
case SSH_CMSG_AUTH_PASSWORD:
if (!options.password_authentication) {
verbose("Password authentication disabled.");
break;
}
/*
* Read user password. It is in plain text, but was
* transmitted over the encrypted channel so it is
* not visible to an outside observer.
*/
password = packet_get_string(&dlen);
packet_integrity_check(plen, 4 + dlen, type);
/* Try authentication with the password. */
authenticated = auth_password(authctxt, password);
memset(password, 0, strlen(password));
xfree(password);
break;
case SSH_CMSG_AUTH_TIS:
debug("rcvd SSH_CMSG_AUTH_TIS");
if (options.challenge_reponse_authentication == 1) {
char *challenge = get_challenge(authctxt, authctxt->style);
if (challenge != NULL) {
debug("sending challenge '%s'", challenge);
packet_start(SSH_SMSG_AUTH_TIS_CHALLENGE);
packet_put_cstring(challenge);
packet_send();
packet_write_wait();
continue;
}
}
break;
case SSH_CMSG_AUTH_TIS_RESPONSE:
debug("rcvd SSH_CMSG_AUTH_TIS_RESPONSE");
if (options.challenge_reponse_authentication == 1) {
char *response = packet_get_string(&dlen);
debug("got response '%s'", response);
packet_integrity_check(plen, 4 + dlen, type);
authenticated = verify_response(authctxt, response);
memset(response, 'r', dlen);
xfree(response);
}
break;
default:
/*
* Any unknown messages will be ignored (and failure
* returned) during authentication.
*/
log("Unknown message during authentication: type %d", type);
break;
}
#ifdef BSD_AUTH
if (authctxt->as) {
auth_close(authctxt->as);
authctxt->as = NULL;
}
#endif
if (!authctxt->valid && authenticated)
fatal("INTERNAL ERROR: authenticated invalid user %s",
authctxt->user);
/* Special handling for root */
if (authenticated && authctxt->pw->pw_uid == 0 &&
!auth_root_allowed(get_authname(type)))
authenticated = 0;
/* Log before sending the reply */
auth_log(authctxt, authenticated, get_authname(type), info);
if (authenticated)
return;
if (authctxt->failures++ > AUTH_FAIL_MAX)
packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
packet_start(SSH_SMSG_FAILURE);
packet_send();
packet_write_wait();
}
}
/*
* Performs authentication of an incoming connection. Session key has already
* been exchanged and encryption is enabled.
*/
void
do_authentication(void)
{
Authctxt *authctxt;
struct passwd *pw;
int plen;
u_int ulen;
char *user, *style = NULL;
/* Get the name of the user that we wish to log in as. */
packet_read_expect(&plen, SSH_CMSG_USER);
/* Get the user name. */
user = packet_get_string(&ulen);
packet_integrity_check(plen, (4 + ulen), SSH_CMSG_USER);
if ((style = strchr(user, ':')) != NULL)
*style++ = 0;
authctxt = authctxt_new();
authctxt->user = user;
authctxt->style = style;
/* Verify that the user is a valid user. */
pw = getpwnam(user);
if (pw && allowed_user(pw)) {
authctxt->valid = 1;
pw = pwcopy(pw);
} else {
debug("do_authentication: illegal user %s", user);
pw = NULL;
}
authctxt->pw = pw;
setproctitle("%s", pw ? user : "unknown");
/*
* If we are not running as root, the user must have the same uid as
* the server.
*/
if (getuid() != 0 && pw && pw->pw_uid != getuid())
packet_disconnect("Cannot change user when server not running as root.");
/*
* Loop until the user has been authenticated or the connection is
* closed, do_authloop() returns only if authentication is successful
*/
do_authloop(authctxt);
/* The user has been authenticated and accepted. */
packet_start(SSH_SMSG_SUCCESS);
packet_send();
packet_write_wait();
/* Perform session preparation. */
do_authenticated(authctxt);
}
Reference in New Issue View Git Blame Copy Permalink