*/
#include "includes.h"
-RCSID("$OpenBSD: auth1.c,v 1.37 2002/03/18 01:12:14 provos Exp $");
+RCSID("$OpenBSD: auth1.c,v 1.52 2003/08/28 12:54:34 markus Exp $");
#include "xmalloc.h"
#include "rsa.h"
#include "auth.h"
#include "channels.h"
#include "session.h"
-#include "misc.h"
#include "uidswap.h"
+#include "monitor_wrap.h"
/* import */
extern ServerOptions options;
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;
char info[1024];
u_int dlen;
u_int ulen;
- int type = 0;
+ int prev, type = 0;
struct passwd *pw = authctxt->pw;
debug("Attempting authentication for %s%.100s.",
/* If the user has no password, accept authentication immediately. */
if (options.password_authentication &&
-#if defined(KRB4) || defined(KRB5)
+#ifdef KRB5
(!options.kerberos_authentication || options.kerberos_or_local_passwd) &&
#endif
-#ifdef USE_PAM
- auth_pam_password(pw, "")) {
-#elif defined(HAVE_OSF_SIA)
- 0) {
-#else
- auth_password(authctxt, "")) {
-#endif
+ PRIVSEP(auth_password(authctxt, ""))) {
auth_log(authctxt, 1, "without authentication", "");
return;
}
info[0] = '\0';
/* Get a packet from the client. */
+ prev = type;
type = packet_read();
+ /*
+ * If we started challenge-response authentication but the
+ * next packet is not a response to our challenge, release
+ * the resources allocated by get_challenge() (which would
+ * normally have been released by verify_response() had we
+ * received such a response)
+ */
+ if (prev == SSH_CMSG_AUTH_TIS &&
+ type != SSH_CMSG_AUTH_TIS_RESPONSE)
+ abandon_challenge_response(authctxt);
+
/* Process the packet. */
switch (type) {
-
-#if defined(KRB4) || defined(KRB5)
- case SSH_CMSG_AUTH_KERBEROS:
- if (!options.kerberos_authentication) {
- verbose("Kerberos authentication disabled.");
- } else {
- char *kdata = packet_get_string(&dlen);
- packet_check_eom();
-
- if (kdata[0] == 4) { /* KRB_PROT_VERSION */
-#ifdef KRB4
- KTEXT_ST tkt;
-
- tkt.length = dlen;
- if (tkt.length < MAX_KTXT_LEN)
- memcpy(tkt.dat, kdata, tkt.length);
-
- if (auth_krb4(authctxt, &tkt, &client_user)) {
- authenticated = 1;
- snprintf(info, sizeof(info),
- " tktuser %.100s",
- client_user);
- }
-#endif /* KRB4 */
- } else {
-#ifdef KRB5
- krb5_data tkt;
- tkt.length = dlen;
- tkt.data = kdata;
-
- if (auth_krb5(authctxt, &tkt, &client_user)) {
- authenticated = 1;
- snprintf(info, sizeof(info),
- " tktuser %.100s",
- client_user);
- }
-#endif /* KRB5 */
- }
- xfree(kdata);
- }
- break;
-#endif /* KRB4 || KRB5 */
-
-#if defined(AFS) || defined(KRB5)
- /* XXX - punt on backward compatibility here. */
- case SSH_CMSG_HAVE_KERBEROS_TGT:
- packet_send_debug("Kerberos TGT passing disabled before authentication.");
- break;
-#ifdef AFS
- case SSH_CMSG_HAVE_AFS_TOKEN:
- packet_send_debug("AFS token passing disabled before authentication.");
- break;
-#endif /* AFS */
-#endif /* AFS || 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_check_eom();
-
- /* Try to authenticate using /etc/hosts.equiv and .rhosts. */
- authenticated = auth_rhosts(pw, client_user);
-
- snprintf(info, sizeof info, " ruser %.100s", client_user);
- break;
-
case SSH_CMSG_AUTH_RHOSTS_RSA:
if (!options.rhosts_rsa_authentication) {
verbose("Rhosts with RSA authentication disabled.");
if (bits != BN_num_bits(client_host_key->rsa->n))
verbose("Warning: keysize mismatch for client_host_key: "
"actual %d, announced %d",
- BN_num_bits(client_host_key->rsa->n), bits);
+ BN_num_bits(client_host_key->rsa->n), bits);
packet_check_eom();
authenticated = auth_rhosts_rsa(pw, client_user,
password = packet_get_string(&dlen);
packet_check_eom();
-#ifdef USE_PAM
- /* Do PAM auth with password */
- authenticated = auth_pam_password(pw, password);
-#elif defined(HAVE_OSF_SIA)
- /* Do SIA auth with password */
- authenticated = auth_sia_password(authctxt->user,
- password);
-#else /* !USE_PAM && !HAVE_OSF_SIA */
/* Try authentication with the password. */
- authenticated = auth_password(authctxt, password);
-#endif /* USE_PAM */
+ authenticated = PRIVSEP(auth_password(authctxt, password));
memset(password, 0, strlen(password));
xfree(password);
debug("rcvd SSH_CMSG_AUTH_TIS_RESPONSE");
if (options.challenge_response_authentication == 1) {
char *response = packet_get_string(&dlen);
- debug("got response '%s'", response);
packet_check_eom();
authenticated = verify_response(authctxt, response);
memset(response, 'r', dlen);
* Any unknown messages will be ignored (and failure
* returned) during authentication.
*/
- log("Unknown message during authentication: type %d", type);
+ logit("Unknown message during authentication: type %d", type);
break;
}
#ifdef BSD_AUTH
fatal("INTERNAL ERROR: authenticated invalid user %s",
authctxt->user);
+#ifdef _UNICOS
+ if (authenticated && cray_access_denied(authctxt->user)) {
+ authenticated = 0;
+ fatal("Access denied for user %s.",authctxt->user);
+ }
+#endif /* _UNICOS */
+
#ifdef HAVE_CYGWIN
if (authenticated &&
!check_nt_auth(type == SSH_CMSG_AUTH_PASSWORD, pw)) {
!auth_root_allowed(get_authname(type)))
authenticated = 0;
#endif
+
#ifdef USE_PAM
- if (authenticated && !do_pam_account(pw->pw_name, client_user))
+ if (options.use_pam && authenticated &&
+ !PRIVSEP(do_pam_account()))
authenticated = 0;
#endif
if (authenticated)
return;
- if (authctxt->failures++ > AUTH_FAIL_MAX) {
-#ifdef WITH_AIXAUTHENTICATE
- loginfailed(authctxt->user,
- get_canonical_hostname(options.verify_reverse_mapping),
- "ssh");
-#endif /* WITH_AIXAUTHENTICATE */
+ if (authctxt->failures++ > AUTH_FAIL_MAX)
packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
- }
packet_start(SSH_SMSG_FAILURE);
packet_send();
do_authentication(void)
{
Authctxt *authctxt;
- struct passwd *pw;
u_int ulen;
- char *p, *user, *style = NULL;
+ char *user, *style = NULL;
/* Get the name of the user that we wish to log in as. */
packet_read_expect(SSH_CMSG_USER);
if ((style = strchr(user, ':')) != NULL)
*style++ = '\0';
- /* XXX - SSH.com Kerberos v5 braindeath. */
- if ((p = strchr(user, '@')) != NULL)
- *p = '\0';
-
authctxt = authctxt_new();
authctxt->user = user;
authctxt->style = style;
/* Verify that the user is a valid user. */
- pw = getpwnamallow(user);
- if (pw) {
+ if ((authctxt->pw = PRIVSEP(getpwnamallow(user))) != NULL)
authctxt->valid = 1;
- pw = pwcopy(pw);
- } else {
+ else {
debug("do_authentication: illegal user %s", user);
- pw = NULL;
+ authctxt->pw = fakepw();
}
- authctxt->pw = pw;
- setproctitle("%s", pw ? user : "unknown");
+ setproctitle("%s%s", authctxt->pw ? user : "unknown",
+ use_privsep ? " [net]" : "");
#ifdef USE_PAM
- start_pam(pw == NULL ? "NOUSER" : user);
+ if (options.use_pam)
+ PRIVSEP(start_pam(user));
#endif
/*
* the server. (Unless you are running Windows)
*/
#ifndef HAVE_CYGWIN
- if (getuid() != 0 && pw && pw->pw_uid != getuid())
+ if (!use_privsep && getuid() != 0 && authctxt->pw &&
+ authctxt->pw->pw_uid != getuid())
packet_disconnect("Cannot change user when server not running as root.");
#endif
andersk / openssh.git / blobdiff