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3149ea0a8a
Add search request size limits to ldap_decode calls. The ldap server uses the smb.conf variable "ldap max search request size" which defaults to 250Kb. For cldap the limit is hard coded as 4096. Credit to OSS-Fuzz REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20454 BUG: https://bugzilla.samba.org/show_bug.cgi?id=14334 Signed-off-by: Gary Lockyer <gary@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
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Fuzzing for ldap_decode.
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Copyright (C) Michael Hanselmann 2019
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "fuzzing/fuzzing.h"
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#include "lib/util/asn1.h"
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#include "libcli/ldap/ldap_message.h"
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#include "libcli/ldap/ldap_proto.h"
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int LLVMFuzzerInitialize(int *argc, char ***argv)
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{
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return 0;
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}
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int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len)
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{
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TALLOC_CTX *mem_ctx = talloc_init(__FUNCTION__);
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struct asn1_data *asn1;
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struct ldap_message *ldap_msg;
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struct ldap_request_limits limits = {
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/*
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* The default size is currently 256000 bytes
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*/
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.max_search_size = 256000
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};
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NTSTATUS status;
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/*
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* Need to limit the max parse tree depth to 250 to prevent
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* ASAN detecting stack overflows.
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*/
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asn1 = asn1_init(mem_ctx, 250);
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if (!asn1) {
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goto out;
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}
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asn1_load_nocopy(asn1, buf, len);
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ldap_msg = talloc(mem_ctx, struct ldap_message);
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if (!ldap_msg) {
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goto out;
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}
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status = ldap_decode(
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asn1, &limits, samba_ldap_control_handlers(), ldap_msg);
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out:
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talloc_free(mem_ctx);
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return 0;
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}
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