mirror of
https://github.com/samba-team/samba.git
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e3a710f290
Signed-off-by: Andreas Schneider <asn@samba.org> Reviewed-by: Volker Lendecke <vl@samba.org>
392 lines
9.8 KiB
C
392 lines
9.8 KiB
C
/*
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Unix SMB/CIFS implementation.
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Helper functions for applying replicated objects
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Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009
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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 "../lib/util/dlinklist.h"
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#include "librpc/gen_ndr/ndr_misc.h"
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#include "librpc/gen_ndr/ndr_drsuapi.h"
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#include "librpc/gen_ndr/ndr_drsblobs.h"
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#include "zlib.h"
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#include "../libcli/drsuapi/drsuapi.h"
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#include "libcli/auth/libcli_auth.h"
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#include "dsdb/samdb/samdb.h"
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#include "lib/crypto/gnutls_helpers.h"
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#include <gnutls/gnutls.h>
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#include <gnutls/crypto.h>
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static WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
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const DATA_BLOB *gensec_skey,
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bool rid_crypt,
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uint32_t rid,
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const DATA_BLOB *in,
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DATA_BLOB *out)
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{
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DATA_BLOB confounder;
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DATA_BLOB enc_buffer;
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DATA_BLOB dec_buffer;
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uint32_t crc32_given;
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uint32_t crc32_calc;
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DATA_BLOB checked_buffer;
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DATA_BLOB plain_buffer;
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WERROR result;
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int rc;
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/*
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* users with rid == 0 should not exist
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*/
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if (rid_crypt && rid == 0) {
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return WERR_DS_DRA_INVALID_PARAMETER;
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}
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/*
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* the first 16 bytes at the beginning are the confounder
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* followed by the 4 byte crc32 checksum
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*/
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if (in->length < 20) {
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return WERR_DS_DRA_INVALID_PARAMETER;
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}
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confounder = data_blob_const(in->data, 16);
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enc_buffer = data_blob_const(in->data + 16, in->length - 16);
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/*
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* decrypt with the encryption key, being md5 over the session
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* key followed by the confounder. The parameter order to
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* samba_gnutls_arcfour_confounded_md5() matters for this!
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*
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* here the gensec session key is used and
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* not the dcerpc ncacn_ip_tcp "SystemLibraryDTC" key!
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*/
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/*
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* reference the encrypted buffer part and
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* decrypt it using the created encryption key using arcfour
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*/
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dec_buffer = data_blob_const(enc_buffer.data, enc_buffer.length);
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rc = samba_gnutls_arcfour_confounded_md5(gensec_skey,
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&confounder,
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&dec_buffer,
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SAMBA_GNUTLS_DECRYPT);
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if (rc < 0) {
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result = gnutls_error_to_werror(rc, WERR_INTERNAL_ERROR);
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goto out;
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}
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/*
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* the first 4 byte are the crc32 checksum
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* of the remaining bytes
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*/
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crc32_given = IVAL(dec_buffer.data, 0);
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crc32_calc = crc32(0, Z_NULL, 0);
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crc32_calc = crc32(crc32_calc,
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dec_buffer.data + 4 ,
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dec_buffer.length - 4);
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checked_buffer = data_blob_const(dec_buffer.data + 4, dec_buffer.length - 4);
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plain_buffer = data_blob_talloc(mem_ctx, checked_buffer.data, checked_buffer.length);
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W_ERROR_HAVE_NO_MEMORY(plain_buffer.data);
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if (crc32_given != crc32_calc) {
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result = W_ERROR(HRES_ERROR_V(HRES_SEC_E_DECRYPT_FAILURE));
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goto out;
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}
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/*
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* The following rid_crypt obfuscation isn't session specific
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* and not really needed here, because we always know the rid of the
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* user account.
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*
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* some attributes with this 'additional encryption' include
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* dBCSPwd, unicodePwd, ntPwdHistory, lmPwdHistory
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*
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* But for the rest of samba it's easier when we remove this static
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* obfuscation here
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*/
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if (rid_crypt) {
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uint32_t i, num_hashes;
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if ((checked_buffer.length % 16) != 0) {
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result = WERR_DS_DRA_INVALID_PARAMETER;
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goto out;
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}
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num_hashes = plain_buffer.length / 16;
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for (i = 0; i < num_hashes; i++) {
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uint32_t offset = i * 16;
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rc = sam_rid_crypt(rid, checked_buffer.data + offset,
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plain_buffer.data + offset,
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SAMBA_GNUTLS_DECRYPT);
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if (rc != 0) {
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result = gnutls_error_to_werror(rc, WERR_INTERNAL_ERROR);
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goto out;
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}
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}
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}
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*out = plain_buffer;
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result = WERR_OK;
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out:
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return result;
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}
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WERROR drsuapi_decrypt_attribute(TALLOC_CTX *mem_ctx,
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const DATA_BLOB *gensec_skey,
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uint32_t rid,
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uint32_t dsdb_repl_flags,
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struct drsuapi_DsReplicaAttribute *attr)
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{
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WERROR status;
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DATA_BLOB *enc_data;
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DATA_BLOB plain_data;
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bool rid_crypt = false;
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if (attr->value_ctr.num_values == 0) {
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return WERR_OK;
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}
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switch (attr->attid) {
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case DRSUAPI_ATTID_dBCSPwd:
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case DRSUAPI_ATTID_unicodePwd:
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case DRSUAPI_ATTID_ntPwdHistory:
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case DRSUAPI_ATTID_lmPwdHistory:
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rid_crypt = true;
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break;
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case DRSUAPI_ATTID_supplementalCredentials:
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case DRSUAPI_ATTID_priorValue:
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case DRSUAPI_ATTID_currentValue:
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case DRSUAPI_ATTID_trustAuthOutgoing:
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case DRSUAPI_ATTID_trustAuthIncoming:
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case DRSUAPI_ATTID_initialAuthOutgoing:
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case DRSUAPI_ATTID_initialAuthIncoming:
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break;
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default:
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return WERR_OK;
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}
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if (dsdb_repl_flags & DSDB_REPL_FLAG_EXPECT_NO_SECRETS) {
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return WERR_TOO_MANY_SECRETS;
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}
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if (attr->value_ctr.num_values > 1) {
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return WERR_DS_DRA_INVALID_PARAMETER;
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}
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if (!attr->value_ctr.values[0].blob) {
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return WERR_DS_DRA_INVALID_PARAMETER;
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}
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enc_data = attr->value_ctr.values[0].blob;
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status = drsuapi_decrypt_attribute_value(mem_ctx,
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gensec_skey,
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rid_crypt,
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rid,
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enc_data,
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&plain_data);
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W_ERROR_NOT_OK_RETURN(status);
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talloc_free(attr->value_ctr.values[0].blob->data);
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*attr->value_ctr.values[0].blob = plain_data;
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return WERR_OK;
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}
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static WERROR drsuapi_encrypt_attribute_value(TALLOC_CTX *mem_ctx,
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const DATA_BLOB *gensec_skey,
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bool rid_crypt,
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uint32_t rid,
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const DATA_BLOB *in,
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DATA_BLOB *out)
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{
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DATA_BLOB rid_crypt_out = data_blob(NULL, 0);
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DATA_BLOB confounder;
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DATA_BLOB enc_buffer;
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DATA_BLOB to_encrypt;
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uint32_t crc32_calc;
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WERROR result;
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int rc;
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/*
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* users with rid == 0 should not exist
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*/
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if (rid_crypt && rid == 0) {
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return WERR_DS_DRA_INVALID_PARAMETER;
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}
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/*
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* The following rid_crypt obfuscation isn't session specific
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* and not really needed here, because we always know the rid of the
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* user account.
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*
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* some attributes with this 'additional encryption' include
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* dBCSPwd, unicodePwd, ntPwdHistory, lmPwdHistory
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*
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* But for the rest of samba it's easier when we remove this static
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* obfuscation here
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*/
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if (rid_crypt) {
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uint32_t i, num_hashes;
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rid_crypt_out = data_blob_talloc(mem_ctx, in->data, in->length);
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W_ERROR_HAVE_NO_MEMORY(rid_crypt_out.data);
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if ((rid_crypt_out.length % 16) != 0) {
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return WERR_DS_DRA_INVALID_PARAMETER;
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}
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num_hashes = rid_crypt_out.length / 16;
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for (i = 0; i < num_hashes; i++) {
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uint32_t offset = i * 16;
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rc = sam_rid_crypt(rid, in->data + offset,
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rid_crypt_out.data + offset,
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SAMBA_GNUTLS_ENCRYPT);
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if (rc != 0) {
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result = gnutls_error_to_werror(rc, WERR_INTERNAL_ERROR);
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goto out;
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}
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}
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in = &rid_crypt_out;
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}
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/*
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* the first 16 bytes at the beginning are the confounder
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* followed by the 4 byte crc32 checksum
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*/
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enc_buffer = data_blob_talloc(mem_ctx, NULL, in->length+20);
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if (!enc_buffer.data) {
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talloc_free(rid_crypt_out.data);
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return WERR_NOT_ENOUGH_MEMORY;
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};
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confounder = data_blob_const(enc_buffer.data, 16);
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generate_random_buffer(confounder.data, confounder.length);
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/*
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* the first 4 byte are the crc32 checksum
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* of the remaining bytes
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*/
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crc32_calc = crc32(0, Z_NULL, 0);
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crc32_calc = crc32(crc32_calc, in->data, in->length);
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SIVAL(enc_buffer.data, 16, crc32_calc);
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/*
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* copy the plain buffer part and
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* encrypt it using the created encryption key using arcfour
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*/
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memcpy(enc_buffer.data+20, in->data, in->length);
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talloc_free(rid_crypt_out.data);
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to_encrypt = data_blob_const(enc_buffer.data+16,
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enc_buffer.length-16);
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/*
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* encrypt with the encryption key, being md5 over the session
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* key followed by the confounder. The parameter order to
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* samba_gnutls_arcfour_confounded_md5() matters for this!
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*
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* here the gensec session key is used and
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* not the dcerpc ncacn_ip_tcp "SystemLibraryDTC" key!
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*/
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rc = samba_gnutls_arcfour_confounded_md5(gensec_skey,
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&confounder,
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&to_encrypt,
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SAMBA_GNUTLS_ENCRYPT);
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if (rc < 0) {
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result = gnutls_error_to_werror(rc, WERR_INTERNAL_ERROR);
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goto out;
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}
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*out = enc_buffer;
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result = WERR_OK;
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out:
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return result;
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}
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/*
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encrypt a DRSUAPI attribute ready for sending over the wire
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Only some attribute types are encrypted
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*/
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WERROR drsuapi_encrypt_attribute(TALLOC_CTX *mem_ctx,
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const DATA_BLOB *gensec_skey,
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uint32_t rid,
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struct drsuapi_DsReplicaAttribute *attr)
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{
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WERROR status;
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DATA_BLOB *plain_data;
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DATA_BLOB enc_data;
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bool rid_crypt = false;
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if (attr->value_ctr.num_values == 0) {
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return WERR_OK;
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}
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switch (attr->attid) {
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case DRSUAPI_ATTID_dBCSPwd:
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case DRSUAPI_ATTID_unicodePwd:
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case DRSUAPI_ATTID_ntPwdHistory:
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case DRSUAPI_ATTID_lmPwdHistory:
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rid_crypt = true;
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break;
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case DRSUAPI_ATTID_supplementalCredentials:
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case DRSUAPI_ATTID_priorValue:
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case DRSUAPI_ATTID_currentValue:
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case DRSUAPI_ATTID_trustAuthOutgoing:
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case DRSUAPI_ATTID_trustAuthIncoming:
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case DRSUAPI_ATTID_initialAuthOutgoing:
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case DRSUAPI_ATTID_initialAuthIncoming:
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break;
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default:
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return WERR_OK;
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}
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if (attr->value_ctr.num_values > 1) {
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return WERR_DS_DRA_INVALID_PARAMETER;
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}
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if (!attr->value_ctr.values[0].blob) {
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return WERR_DS_DRA_INVALID_PARAMETER;
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}
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plain_data = attr->value_ctr.values[0].blob;
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status = drsuapi_encrypt_attribute_value(mem_ctx,
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gensec_skey,
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rid_crypt,
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rid,
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plain_data,
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&enc_data);
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W_ERROR_NOT_OK_RETURN(status);
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talloc_free(attr->value_ctr.values[0].blob->data);
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*attr->value_ctr.values[0].blob = enc_data;
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return WERR_OK;
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}
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