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libcli/smb: add smb2_signing_derivations_fill_const_stack()

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This will allow us to have the logic in one place only
in future.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14512

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This commit is contained in:
Stefan Metzmacher
2021-03-05 16:10:07 +01:00
committed by Jeremy Allison
parent 17b99809b3
commit e4c1a00595
2 changed files with 76 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
libcli/smb/smb2_signing.c
View File

@ -34,6 +34,62 @@
#include "lib/crypto/gnutls_helpers.h"
void smb2_signing_derivations_fill_const_stack(struct smb2_signing_derivations *ds,
enum protocol_types protocol,
const DATA_BLOB preauth_hash)
{
*ds = (struct smb2_signing_derivations) { .signing = NULL, };
if (protocol >= PROTOCOL_SMB3_10) {
struct smb2_signing_derivation *d = NULL;
SMB_ASSERT(preauth_hash.length != 0);
d = &ds->__signing;
ds->signing = d;
d->label = data_blob_string_const_null("SMBSigningKey");
d->context = preauth_hash;
d = &ds->__cipher_c2s;
ds->cipher_c2s = d;
d->label = data_blob_string_const_null("SMBC2SCipherKey");
d->context = preauth_hash;
d = &ds->__cipher_s2c;
ds->cipher_s2c = d;
d->label = data_blob_string_const_null("SMBS2CCipherKey");
d->context = preauth_hash;
d = &ds->__application;
ds->application = d;
d->label = data_blob_string_const_null("SMBAppKey");
d->context = preauth_hash;
} else if (protocol >= PROTOCOL_SMB2_24) {
struct smb2_signing_derivation *d = NULL;
d = &ds->__signing;
ds->signing = d;
d->label = data_blob_string_const_null("SMB2AESCMAC");
d->context = data_blob_string_const_null("SmbSign");
d = &ds->__cipher_c2s;
ds->cipher_c2s = d;
d->label = data_blob_string_const_null("SMB2AESCCM");
d->context = data_blob_string_const_null("ServerIn ");
d = &ds->__cipher_s2c;
ds->cipher_s2c = d;
d->label = data_blob_string_const_null("SMB2AESCCM");
d->context = data_blob_string_const_null("ServerOut");
d = &ds->__application;
ds->application = d;
d->label = data_blob_string_const_null("SMB2APP");
d->context = data_blob_string_const_null("SmbRpc");
}
}
int smb2_signing_key_destructor(struct smb2_signing_key *key)
{
if (key->hmac_hnd != NULL) {

20
libcli/smb/smb2_signing.h
View File

@ -23,6 +23,26 @@
struct iovec;
struct smb2_signing_derivation {
DATA_BLOB label;
DATA_BLOB context;
};
struct smb2_signing_derivations {
struct smb2_signing_derivation __signing;
const struct smb2_signing_derivation *signing;
struct smb2_signing_derivation __cipher_c2s;
const struct smb2_signing_derivation *cipher_c2s;
struct smb2_signing_derivation __cipher_s2c;
const struct smb2_signing_derivation *cipher_s2c;
struct smb2_signing_derivation __application;
const struct smb2_signing_derivation *application;
};
void smb2_signing_derivations_fill_const_stack(struct smb2_signing_derivations *ds,
enum protocol_types protocol,
const DATA_BLOB preauth_hash);
struct smb2_signing_key {
DATA_BLOB blob;
union {