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upstream: clamp max number of GSSAPI mechanisms to 2048; ok dtucker

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OpenBSD-Commit-ID: ce66db603a913d3dd57063e330cb5494d70722c4
This commit is contained in:
djm@openbsd.org 2023-03-31 04:22:27 +00:00 committed by Damien Miller
parent 1883841fc1
commit 8ba2d4764b
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1 changed files with 9 additions and 3 deletions
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12
auth2-gss.c
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@ -1,4 +1,4 @@
/* $OpenBSD: auth2-gss.c,v 1.33 2021/12/19 22:12:07 djm Exp $ */
/* $OpenBSD: auth2-gss.c,v 1.34 2023/03/31 04:22:27 djm Exp $ */
/*
* Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
@ -48,6 +48,8 @@
#include "ssh-gss.h"
#include "monitor_wrap.h"
#define SSH_GSSAPI_MAX_MECHS 2048
extern ServerOptions options;
static int input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh);
@ -75,7 +77,11 @@ userauth_gssapi(struct ssh *ssh, const char *method)
fatal_fr(r, "parse packet");
if (mechs == 0) {
debug("Mechanism negotiation is not supported");
logit_f("mechanism negotiation is not supported");
return (0);
} else if (mechs > SSH_GSSAPI_MAX_MECHS) {
logit_f("too many mechanisms requested %u > %u", mechs,
SSH_GSSAPI_MAX_MECHS);
return (0);
}
@ -94,7 +100,7 @@ userauth_gssapi(struct ssh *ssh, const char *method)
goid.length = len - 2;
ssh_gssapi_test_oid_supported(&ms, &goid, &present);
} else {
logit("Badly formed OID received");
logit_f("badly formed OID received");
}
} while (mechs > 0 && !present);