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krb5: zero nonce before encoding for GSS preauth

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Zero nonce before encoding KDC-REQ-BODY to be used as channel binding
application data in GSS-API pre-authentication. This is because the nonce may
change between AS-REQs and the channel binding data should be invariant between
calls to GSS_Init_sec_context().
This commit is contained in:
Luke Howard
2021-09-07 14:31:12 +10:00
parent be2c28cc34
commit 34b374b5e4
2 changed files with 15 additions and 2 deletions
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6
kdc/gss_preauth.c
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@@ -191,6 +191,7 @@ _kdc_gss_rd_padata(astgs_request_t r,
{
krb5_error_code ret;
size_t size;
KDC_REQ_BODY kdc_req_body;
OM_uint32 minor;
gss_client_params *gcp = NULL;
@@ -231,8 +232,11 @@ _kdc_gss_rd_padata(astgs_request_t r,
_krb5_gss_data_to_buffer(&pa->padata_value, &input_token);
kdc_req_body = r->req.req_body;
kdc_req_body.nonce = 0;
ASN1_MALLOC_ENCODE(KDC_REQ_BODY, cb.application_data.value,
cb.application_data.length, &r->req.req_body,
cb.application_data.length, &kdc_req_body,
&size, ret);
heim_assert(ret || size == cb.application_data.length,
"internal asn1 encoder error");