Import of OpenSSH 4.6p1

[gssapi-openssh.git] / openssh / auth2.c

diff --git a/openssh/auth2.c b/openssh/auth2.c
index 1177efa73437f85b63562b0a3d472396a28017f8..b1a4e3635aa76d45282b772bf6cb7543016c47d1 100644 (file)
--- a/openssh/auth2.c
+++ b/openssh/auth2.c
@@ -1,3 +1,4 @@
+/* $OpenBSD: auth2.c,v 1.114 2007/03/01 10:28:02 dtucker Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  *
@@ -23,27 +24,37 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth2.c,v 1.104 2003/11/04 08:54:09 djm Exp $");
 
-#include "ssh2.h"
+#include <sys/types.h>
+
+#include <pwd.h>
+#include <stdarg.h>
+#include <string.h>
+
 #include "xmalloc.h"
+#include "ssh2.h"
 #include "packet.h"
 #include "log.h"
+#include "buffer.h"
 #include "servconf.h"
 #include "compat.h"
+#include "key.h"
+#include "hostfile.h"
 #include "auth.h"
 #include "dispatch.h"
 #include "pathnames.h"
-#include "monitor_wrap.h"
+#include "buffer.h"
 
 #ifdef GSSAPI
 #include "ssh-gss.h"
 #endif
+#include "monitor_wrap.h"
 
 /* import */
 extern ServerOptions options;
 extern u_char *session_id2;
 extern u_int session_id2_len;
+extern Buffer loginmsg;
 
 /* methods */
 
@@ -85,15 +96,12 @@ int user_key_allowed(struct passwd *, Key *);
 void
 do_authentication2(Authctxt *authctxt)
 {
-       /* challenge-response is implemented via keyboard interactive */
-       if (options.challenge_response_authentication)
-               options.kbd_interactive_authentication = 1;
-
        dispatch_init(&dispatch_protocol_error);
        dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
        dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
 }
 
+/*ARGSUSED*/
 static void
 input_service_request(int type, u_int32_t seq, void *ctxt)
 {
@@ -127,6 +135,7 @@ input_service_request(int type, u_int32_t seq, void *ctxt)
        xfree(service);
 }
 
+/*ARGSUSED*/
 static void
 input_userauth_request(int type, u_int32_t seq, void *ctxt)
 {
@@ -154,19 +163,18 @@ input_userauth_request(int type, u_int32_t seq, void *ctxt)
                if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
                        authctxt->valid = 1;
                        debug2("input_userauth_request: setting up authctxt for %s", user);
-#ifdef USE_PAM
-                       if (options.use_pam)
-                               PRIVSEP(start_pam(authctxt));
-#endif
                } else {
-                       logit("input_userauth_request: illegal user %s", user);
+                       logit("input_userauth_request: invalid user %s", user);
                        authctxt->pw = fakepw();
-#ifdef USE_PAM
-                       if (options.use_pam)
-                               PRIVSEP(start_pam(authctxt));
+#ifdef SSH_AUDIT_EVENTS
+                       PRIVSEP(audit_event(SSH_INVALID_USER));
 #endif
                }
-               setproctitle("%s%s", authctxt->pw ? user : "unknown",
+#ifdef USE_PAM
+               if (options.use_pam)
+                       PRIVSEP(start_pam(authctxt));
+#endif
+               setproctitle("%s%s", authctxt->valid ? user : "unknown",
                    use_privsep ? " [net]" : "");
                authctxt->service = xstrdup(service);
                authctxt->style = style ? xstrdup(style) : NULL;
@@ -212,12 +220,26 @@ userauth_finish(Authctxt *authctxt, int authenticated, char *method)
 
        /* Special handling for root */
        if (authenticated && authctxt->pw->pw_uid == 0 &&
-           !auth_root_allowed(method))
+           !auth_root_allowed(method)) {
                authenticated = 0;
+#ifdef SSH_AUDIT_EVENTS
+               PRIVSEP(audit_event(SSH_LOGIN_ROOT_DENIED));
+#endif
+       }
 
 #ifdef USE_PAM
-       if (options.use_pam && authenticated && !PRIVSEP(do_pam_account()))
-               authenticated = 0;
+       if (options.use_pam && authenticated) {
+               if (!PRIVSEP(do_pam_account())) {
+                       /* if PAM returned a message, send it to the user */
+                       if (buffer_len(&loginmsg) > 0) {
+                               buffer_append(&loginmsg, "\0", 1);
+                               userauth_send_banner(buffer_ptr(&loginmsg));
+                               packet_write_wait();
+                       }
+                       fatal("Access denied for user %s by PAM account "
+                           "configuration", authctxt->user);
+               }
+       }
 #endif
 
 #ifdef _UNICOS
@@ -243,8 +265,12 @@ userauth_finish(Authctxt *authctxt, int authenticated, char *method)
                /* now we can break out */
                authctxt->success = 1;
        } else {
-               if (authctxt->failures++ > AUTH_FAIL_MAX)
+               if (authctxt->failures++ > options.max_authtries) {
+#ifdef SSH_AUDIT_EVENTS
+                       PRIVSEP(audit_event(SSH_LOGIN_EXCEED_MAXTRIES));
+#endif
                        packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
+               }
                methods = authmethods_get();
                packet_start(SSH2_MSG_USERAUTH_FAILURE);
                packet_put_cstring(methods);