X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/2362db19c34ff0d1b04e3b2656523d93089a4a15..d4f40d925d35e026b3262b91c5e4c01797fa6be5:/auth2.c

diff --git a/auth2.c b/auth2.c
index ef1173fe..83d5224c 100644
--- a/auth2.c
+++ b/auth2.c
@@ -1,3 +1,4 @@
+/* $OpenBSD: auth2.c,v 1.112 2006/07/22 20:48:22 stevesk Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  *
@@ -23,7 +24,11 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth2.c,v 1.103 2003/09/23 20:17:11 markus Exp $");
+
+#include <sys/types.h>
+
+#include <pwd.h>
+#include <string.h>
 
 #include "ssh2.h"
 #include "xmalloc.h"
@@ -35,6 +40,7 @@ RCSID("$OpenBSD: auth2.c,v 1.103 2003/09/23 20:17:11 markus Exp $");
 #include "dispatch.h"
 #include "pathnames.h"
 #include "monitor_wrap.h"
+#include "buffer.h"
 
 #ifdef GSSAPI
 #include "ssh-gss.h"
@@ -44,6 +50,7 @@ RCSID("$OpenBSD: auth2.c,v 1.103 2003/09/23 20:17:11 markus Exp $");
 extern ServerOptions options;
 extern u_char *session_id2;
 extern u_int session_id2_len;
+extern Buffer loginmsg;
 
 /* methods */
 
@@ -77,7 +84,6 @@ static void input_userauth_request(int, u_int32_t, void *);
 static Authmethod *authmethod_lookup(const char *);
 static char *authmethods_get(void);
 int user_key_allowed(struct passwd *, Key *);
-int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
 
 /*
  * loop until authctxt->success == TRUE
@@ -95,6 +101,7 @@ do_authentication2(Authctxt *authctxt)
 	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
 }
 
+/*ARGSUSED*/
 static void
 input_service_request(int type, u_int32_t seq, void *ctxt)
 {
@@ -128,6 +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)
 {
@@ -151,24 +159,23 @@ input_userauth_request(int type, u_int32_t seq, void *ctxt)
 	if (authctxt->attempt++ == 0) {
 		/* setup auth context */
 		authctxt->pw = PRIVSEP(getpwnamallow(user));
+		authctxt->user = xstrdup(user);
 		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->pw->pw_name));
-#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(user));
+#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->user = xstrdup(user);
 		authctxt->service = xstrdup(service);
 		authctxt->style = style ? xstrdup(style) : NULL;
 		if (use_privsep)
@@ -213,12 +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
@@ -244,8 +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);