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authordjm@openbsd.org <djm@openbsd.org>2018-07-31 03:10:27 +0000
committerDamien Miller <djm@mindrot.org>2018-07-31 13:13:26 +1000
commit74287f5df9966a0648b4a68417451dd18f079ab8 (patch)
treed65deaf7d3ef15405cf8bdbffc9d96b88341a314
parent1a66079c0669813306cc69e5776a4acd9fb49015 (diff)
upstream: delay bailout for invalid authentic
=?UTF-8?q?ating=20user=20until=20after=20the=20packet=20containing=20the?= =?UTF-8?q?=20request=20has=20been=20fully=20parsed.=20Reported=20by=20Dar?= =?UTF-8?q?iusz=20Tytko=20and=20Micha=C5=82=20Sajdak;=20ok=20deraadt?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit OpenBSD-Commit-ID: b4891882fbe413f230fe8ac8a37349b03bd0b70d
-rw-r--r--auth2-gss.c11
-rw-r--r--auth2-hostbased.c11
-rw-r--r--auth2-pubkey.c25
3 files changed, 28 insertions, 19 deletions
diff --git a/auth2-gss.c b/auth2-gss.c
index 47308c5c..9351e042 100644
--- a/auth2-gss.c
+++ b/auth2-gss.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth2-gss.c,v 1.28 2018/07/10 09:13:30 djm Exp $ */
+/* $OpenBSD: auth2-gss.c,v 1.29 2018/07/31 03:10:27 djm Exp $ */
/*
* Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
@@ -70,9 +70,6 @@ userauth_gssapi(struct ssh *ssh)
size_t len;
u_char *doid = NULL;
- if (!authctxt->valid || authctxt->user == NULL)
- return (0);
-
if ((r = sshpkt_get_u32(ssh, &mechs)) != 0)
fatal("%s: %s", __func__, ssh_err(r));
@@ -106,6 +103,12 @@ userauth_gssapi(struct ssh *ssh)
return (0);
}
+ if (!authctxt->valid || authctxt->user == NULL) {
+ debug2("%s: disabled because of invalid user", __func__);
+ free(doid);
+ return (0);
+ }
+
if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, &goid)))) {
if (ctxt != NULL)
ssh_gssapi_delete_ctx(&ctxt);
diff --git a/auth2-hostbased.c b/auth2-hostbased.c
index 60159a56..35939329 100644
--- a/auth2-hostbased.c
+++ b/auth2-hostbased.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth2-hostbased.c,v 1.35 2018/07/09 21:35:50 markus Exp $ */
+/* $OpenBSD: auth2-hostbased.c,v 1.36 2018/07/31 03:10:27 djm Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
@@ -67,10 +67,6 @@ userauth_hostbased(struct ssh *ssh)
size_t alen, blen, slen;
int r, pktype, authenticated = 0;
- if (!authctxt->valid) {
- debug2("%s: disabled because of invalid user", __func__);
- return 0;
- }
/* XXX use sshkey_froms() */
if ((r = sshpkt_get_cstring(ssh, &pkalg, &alen)) != 0 ||
(r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
@@ -117,6 +113,11 @@ userauth_hostbased(struct ssh *ssh)
goto done;
}
+ if (!authctxt->valid || authctxt->user == NULL) {
+ debug2("%s: disabled because of invalid user", __func__);
+ goto done;
+ }
+
if ((b = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
/* reconstruct packet */
diff --git a/auth2-pubkey.c b/auth2-pubkey.c
index c4d0f790..e1c15040 100644
--- a/auth2-pubkey.c
+++ b/auth2-pubkey.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth2-pubkey.c,v 1.82 2018/07/11 18:55:11 markus Exp $ */
+/* $OpenBSD: auth2-pubkey.c,v 1.83 2018/07/31 03:10:27 djm Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
@@ -89,19 +89,15 @@ userauth_pubkey(struct ssh *ssh)
{
Authctxt *authctxt = ssh->authctxt;
struct passwd *pw = authctxt->pw;
- struct sshbuf *b;
+ struct sshbuf *b = NULL;
struct sshkey *key = NULL;
- char *pkalg, *userstyle = NULL, *key_s = NULL, *ca_s = NULL;
- u_char *pkblob, *sig, have_sig;
+ char *pkalg = NULL, *userstyle = NULL, *key_s = NULL, *ca_s = NULL;
+ u_char *pkblob = NULL, *sig = NULL, have_sig;
size_t blen, slen;
int r, pktype;
int authenticated = 0;
struct sshauthopt *authopts = NULL;
- if (!authctxt->valid) {
- debug2("%s: disabled because of invalid user", __func__);
- return 0;
- }
if ((r = sshpkt_get_u8(ssh, &have_sig)) != 0 ||
(r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 ||
(r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0)
@@ -167,6 +163,11 @@ userauth_pubkey(struct ssh *ssh)
fatal("%s: sshbuf_put_string session id: %s",
__func__, ssh_err(r));
}
+ if (!authctxt->valid || authctxt->user == NULL) {
+ debug2("%s: disabled because of invalid user",
+ __func__);
+ goto done;
+ }
/* reconstruct packet */
xasprintf(&userstyle, "%s%s%s", authctxt->user,
authctxt->style ? ":" : "",
@@ -183,7 +184,6 @@ userauth_pubkey(struct ssh *ssh)
#ifdef DEBUG_PK
sshbuf_dump(b, stderr);
#endif
-
/* test for correct signature */
authenticated = 0;
if (PRIVSEP(user_key_allowed(ssh, pw, key, 1, &authopts)) &&
@@ -194,7 +194,6 @@ userauth_pubkey(struct ssh *ssh)
authenticated = 1;
}
sshbuf_free(b);
- free(sig);
auth2_record_key(authctxt, authenticated, key);
} else {
debug("%s: test pkalg %s pkblob %s%s%s",
@@ -205,6 +204,11 @@ userauth_pubkey(struct ssh *ssh)
if ((r = sshpkt_get_end(ssh)) != 0)
fatal("%s: %s", __func__, ssh_err(r));
+ if (!authctxt->valid || authctxt->user == NULL) {
+ debug2("%s: disabled because of invalid user",
+ __func__);
+ goto done;
+ }
/* XXX fake reply and always send PK_OK ? */
/*
* XXX this allows testing whether a user is allowed
@@ -238,6 +242,7 @@ done:
free(pkblob);
free(key_s);
free(ca_s);
+ free(sig);
return authenticated;
}