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https://github.com/samba-team/samba.git
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022947097f
Guenther
642 lines
16 KiB
C
642 lines
16 KiB
C
/*
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Unix SMB/CIFS implementation.
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Copyright (C) Guenther Deschner <gd@samba.org> 2008
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Copyright (C) Michael Adam 2008
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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 "libnet/libnet.h"
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#include "librpc/gen_ndr/ndr_drsblobs.h"
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#if defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC)
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/**
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* Internal helper function to add data to the list
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* of keytab entries. It builds the prefix from the input.
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*/
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static NTSTATUS add_to_keytab_entries(TALLOC_CTX *mem_ctx,
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struct libnet_keytab_context *ctx,
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uint32_t kvno,
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const char *name,
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const char *prefix,
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const krb5_enctype enctype,
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DATA_BLOB blob)
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{
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struct libnet_keytab_entry entry;
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entry.kvno = kvno;
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entry.name = talloc_strdup(mem_ctx, name);
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entry.principal = talloc_asprintf(mem_ctx, "%s%s%s@%s",
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prefix ? prefix : "",
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prefix ? "/" : "",
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name, ctx->dns_domain_name);
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entry.enctype = enctype;
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entry.password = blob;
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NT_STATUS_HAVE_NO_MEMORY(entry.name);
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NT_STATUS_HAVE_NO_MEMORY(entry.principal);
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NT_STATUS_HAVE_NO_MEMORY(entry.password.data);
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ADD_TO_ARRAY(mem_ctx, struct libnet_keytab_entry, entry,
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&ctx->entries, &ctx->count);
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NT_STATUS_HAVE_NO_MEMORY(ctx->entries);
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return NT_STATUS_OK;
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}
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static NTSTATUS keytab_startup(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
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struct replUpToDateVectorBlob **pold_utdv)
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{
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krb5_error_code ret = 0;
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struct libnet_keytab_context *keytab_ctx;
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struct libnet_keytab_entry *entry;
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struct replUpToDateVectorBlob *old_utdv = NULL;
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char *principal;
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ret = libnet_keytab_init(mem_ctx, ctx->output_filename, &keytab_ctx);
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if (ret) {
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return krb5_to_nt_status(ret);
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}
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keytab_ctx->dns_domain_name = ctx->dns_domain_name;
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keytab_ctx->clean_old_entries = ctx->clean_old_entries;
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ctx->private_data = keytab_ctx;
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principal = talloc_asprintf(mem_ctx, "UTDV/%s@%s",
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ctx->nc_dn, ctx->dns_domain_name);
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NT_STATUS_HAVE_NO_MEMORY(principal);
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entry = libnet_keytab_search(keytab_ctx, principal, 0, ENCTYPE_NULL,
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mem_ctx);
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if (entry) {
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enum ndr_err_code ndr_err;
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old_utdv = talloc(mem_ctx, struct replUpToDateVectorBlob);
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ndr_err = ndr_pull_struct_blob(&entry->password, old_utdv,
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NULL, old_utdv,
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(ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
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ctx->error_message = talloc_asprintf(ctx,
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"Failed to pull UpToDateVector: %s",
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nt_errstr(status));
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return status;
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}
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if (DEBUGLEVEL >= 10) {
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NDR_PRINT_DEBUG(replUpToDateVectorBlob, old_utdv);
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}
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}
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if (pold_utdv) {
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*pold_utdv = old_utdv;
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}
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return NT_STATUS_OK;
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}
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static NTSTATUS keytab_finish(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
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struct replUpToDateVectorBlob *new_utdv)
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{
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NTSTATUS status = NT_STATUS_OK;
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krb5_error_code ret = 0;
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struct libnet_keytab_context *keytab_ctx =
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(struct libnet_keytab_context *)ctx->private_data;
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if (new_utdv) {
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enum ndr_err_code ndr_err;
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DATA_BLOB blob;
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if (DEBUGLEVEL >= 10) {
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NDR_PRINT_DEBUG(replUpToDateVectorBlob, new_utdv);
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}
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ndr_err = ndr_push_struct_blob(&blob, mem_ctx, NULL, new_utdv,
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(ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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ctx->error_message = talloc_asprintf(ctx,
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"Failed to push UpToDateVector: %s",
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nt_errstr(status));
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goto done;
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}
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status = add_to_keytab_entries(mem_ctx, keytab_ctx, 0,
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ctx->nc_dn, "UTDV",
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ENCTYPE_NULL,
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blob);
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if (!NT_STATUS_IS_OK(status)) {
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goto done;
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}
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}
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ret = libnet_keytab_add(keytab_ctx);
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if (ret) {
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status = krb5_to_nt_status(ret);
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ctx->error_message = talloc_asprintf(ctx,
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"Failed to add entries to keytab %s: %s",
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keytab_ctx->keytab_name, error_message(ret));
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goto done;
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}
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ctx->result_message = talloc_asprintf(ctx,
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"Vampired %d accounts to keytab %s",
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keytab_ctx->count,
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keytab_ctx->keytab_name);
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done:
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TALLOC_FREE(keytab_ctx);
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return status;
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}
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/****************************************************************
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****************************************************************/
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static NTSTATUS parse_supplemental_credentials(TALLOC_CTX *mem_ctx,
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const DATA_BLOB *blob,
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struct package_PrimaryKerberosCtr3 **pkb3,
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struct package_PrimaryKerberosCtr4 **pkb4)
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{
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NTSTATUS status;
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enum ndr_err_code ndr_err;
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struct supplementalCredentialsBlob scb;
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struct supplementalCredentialsPackage *scpk = NULL;
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DATA_BLOB scpk_blob;
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struct package_PrimaryKerberosBlob *pkb;
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bool newer_keys = false;
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uint32_t j;
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ndr_err = ndr_pull_struct_blob_all(blob, mem_ctx, NULL, &scb,
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(ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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goto done;
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}
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if (scb.sub.signature !=
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SUPPLEMENTAL_CREDENTIALS_SIGNATURE)
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{
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if (DEBUGLEVEL >= 10) {
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NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
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}
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status = NT_STATUS_INVALID_PARAMETER;
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goto done;
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}
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for (j=0; j < scb.sub.num_packages; j++) {
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if (strcmp("Primary:Kerberos-Newer-Keys",
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scb.sub.packages[j].name) == 0)
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{
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scpk = &scb.sub.packages[j];
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if (!scpk->data || !scpk->data[0]) {
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scpk = NULL;
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continue;
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}
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newer_keys = true;
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break;
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} else if (strcmp("Primary:Kerberos",
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scb.sub.packages[j].name) == 0)
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{
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/*
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* grab this but don't break here:
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* there might still be newer-keys ...
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*/
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scpk = &scb.sub.packages[j];
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if (!scpk->data || !scpk->data[0]) {
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scpk = NULL;
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}
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}
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}
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if (!scpk) {
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/* no data */
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status = NT_STATUS_OK;
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goto done;
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}
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scpk_blob = strhex_to_data_blob(mem_ctx, scpk->data);
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if (!scpk_blob.data) {
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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pkb = TALLOC_ZERO_P(mem_ctx, struct package_PrimaryKerberosBlob);
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if (!pkb) {
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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ndr_err = ndr_pull_struct_blob(&scpk_blob, mem_ctx, NULL, pkb,
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(ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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goto done;
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}
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if (!newer_keys && pkb->version != 3) {
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status = NT_STATUS_INVALID_PARAMETER;
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goto done;
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}
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if (newer_keys && pkb->version != 4) {
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status = NT_STATUS_INVALID_PARAMETER;
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goto done;
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}
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if (pkb->version == 4 && pkb4) {
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*pkb4 = &pkb->ctr.ctr4;
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} else if (pkb->version == 3 && pkb3) {
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*pkb3 = &pkb->ctr.ctr3;
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}
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status = NT_STATUS_OK;
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done:
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return status;
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}
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static NTSTATUS parse_object(TALLOC_CTX *mem_ctx,
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struct libnet_keytab_context *ctx,
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struct drsuapi_DsReplicaObjectListItemEx *cur)
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{
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NTSTATUS status = NT_STATUS_OK;
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uchar nt_passwd[16];
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DATA_BLOB *blob;
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int i = 0;
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struct drsuapi_DsReplicaAttribute *attr;
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bool got_pwd = false;
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struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
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struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
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char *object_dn = NULL;
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char *upn = NULL;
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char **spn = NULL;
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uint32_t num_spns = 0;
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char *name = NULL;
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uint32_t kvno = 0;
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uint32_t uacc = 0;
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uint32_t sam_type = 0;
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uint32_t pwd_history_len = 0;
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uint8_t *pwd_history = NULL;
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ZERO_STRUCT(nt_passwd);
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object_dn = talloc_strdup(mem_ctx, cur->object.identifier->dn);
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if (!object_dn) {
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return NT_STATUS_NO_MEMORY;
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}
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DEBUG(3, ("parsing object '%s'\n", object_dn));
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for (i=0; i < cur->object.attribute_ctr.num_attributes; i++) {
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attr = &cur->object.attribute_ctr.attributes[i];
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if (attr->attid == DRSUAPI_ATTRIBUTE_servicePrincipalName) {
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uint32_t count;
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num_spns = attr->value_ctr.num_values;
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spn = TALLOC_ARRAY(mem_ctx, char *, num_spns);
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for (count = 0; count < num_spns; count++) {
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blob = attr->value_ctr.values[count].blob;
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pull_string_talloc(spn, NULL, 0,
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&spn[count],
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blob->data, blob->length,
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STR_UNICODE);
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}
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}
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if (attr->value_ctr.num_values != 1) {
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continue;
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}
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if (!attr->value_ctr.values[0].blob) {
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continue;
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}
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blob = attr->value_ctr.values[0].blob;
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switch (attr->attid) {
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case DRSUAPI_ATTRIBUTE_unicodePwd:
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if (blob->length != 16) {
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break;
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}
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memcpy(&nt_passwd, blob->data, 16);
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got_pwd = true;
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/* pick the kvno from the meta_data version,
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* thanks, metze, for explaining this */
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if (!cur->meta_data_ctr) {
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break;
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}
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if (cur->meta_data_ctr->count !=
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cur->object.attribute_ctr.num_attributes) {
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break;
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}
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kvno = cur->meta_data_ctr->meta_data[i].version;
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break;
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case DRSUAPI_ATTRIBUTE_ntPwdHistory:
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pwd_history_len = blob->length / 16;
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pwd_history = blob->data;
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break;
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case DRSUAPI_ATTRIBUTE_userPrincipalName:
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pull_string_talloc(mem_ctx, NULL, 0, &upn,
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blob->data, blob->length,
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STR_UNICODE);
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break;
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case DRSUAPI_ATTRIBUTE_sAMAccountName:
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pull_string_talloc(mem_ctx, NULL, 0, &name,
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blob->data, blob->length,
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STR_UNICODE);
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break;
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case DRSUAPI_ATTRIBUTE_sAMAccountType:
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sam_type = IVAL(blob->data, 0);
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break;
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case DRSUAPI_ATTRIBUTE_userAccountControl:
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uacc = IVAL(blob->data, 0);
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break;
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case DRSUAPI_ATTRIBUTE_supplementalCredentials:
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status = parse_supplemental_credentials(mem_ctx,
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blob,
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&pkb3,
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&pkb4);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(2, ("parsing of supplemental "
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"credentials failed: %s\n",
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nt_errstr(status)));
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}
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break;
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default:
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break;
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}
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}
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if (!got_pwd) {
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DEBUG(10, ("no password (unicodePwd) found - skipping.\n"));
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return NT_STATUS_OK;
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}
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if (name) {
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status = add_to_keytab_entries(mem_ctx, ctx, 0, object_dn,
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"SAMACCOUNTNAME",
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ENCTYPE_NULL,
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data_blob_talloc(mem_ctx, name,
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strlen(name) + 1));
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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} else {
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/* look into keytab ... */
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struct libnet_keytab_entry *entry = NULL;
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char *principal = NULL;
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DEBUG(10, ("looking for SAMACCOUNTNAME/%s@%s in keytayb...\n",
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object_dn, ctx->dns_domain_name));
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principal = talloc_asprintf(mem_ctx, "%s/%s@%s",
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"SAMACCOUNTNAME",
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object_dn,
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ctx->dns_domain_name);
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if (!principal) {
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DEBUG(1, ("talloc failed\n"));
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return NT_STATUS_NO_MEMORY;
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}
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entry = libnet_keytab_search(ctx, principal, 0, ENCTYPE_NULL,
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mem_ctx);
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if (entry) {
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name = (char *)TALLOC_MEMDUP(mem_ctx,
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entry->password.data,
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entry->password.length);
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if (!name) {
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DEBUG(1, ("talloc failed!"));
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return NT_STATUS_NO_MEMORY;
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} else {
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DEBUG(10, ("found name %s\n", name));
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}
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TALLOC_FREE(entry);
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} else {
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DEBUG(10, ("entry not found\n"));
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}
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TALLOC_FREE(principal);
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}
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if (!name) {
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DEBUG(10, ("no name (sAMAccountName) found - skipping.\n"));
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return NT_STATUS_OK;
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}
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DEBUG(1,("#%02d: %s:%d, ", ctx->count, name, kvno));
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DEBUGADD(1,("sAMAccountType: 0x%08x, userAccountControl: 0x%08x",
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sam_type, uacc));
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if (upn) {
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DEBUGADD(1,(", upn: %s", upn));
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}
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if (num_spns > 0) {
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DEBUGADD(1, (", spns: ["));
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for (i = 0; i < num_spns; i++) {
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DEBUGADD(1, ("%s%s", spn[i],
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(i+1 == num_spns)?"]":", "));
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}
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}
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DEBUGADD(1,("\n"));
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status = add_to_keytab_entries(mem_ctx, ctx, kvno, name, NULL,
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ENCTYPE_ARCFOUR_HMAC,
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data_blob_talloc(mem_ctx, nt_passwd, 16));
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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/* add kerberos keys (if any) */
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if (pkb4) {
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for (i=0; i < pkb4->num_keys; i++) {
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if (!pkb4->keys[i].value) {
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continue;
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}
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status = add_to_keytab_entries(mem_ctx, ctx, kvno,
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name,
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NULL,
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pkb4->keys[i].keytype,
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*pkb4->keys[i].value);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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}
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for (i=0; i < pkb4->num_old_keys; i++) {
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if (!pkb4->old_keys[i].value) {
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continue;
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}
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status = add_to_keytab_entries(mem_ctx, ctx, kvno - 1,
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name,
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NULL,
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pkb4->old_keys[i].keytype,
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*pkb4->old_keys[i].value);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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}
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for (i=0; i < pkb4->num_older_keys; i++) {
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if (!pkb4->older_keys[i].value) {
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continue;
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}
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status = add_to_keytab_entries(mem_ctx, ctx, kvno - 2,
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name,
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NULL,
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pkb4->older_keys[i].keytype,
|
|
*pkb4->older_keys[i].value);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (pkb3) {
|
|
for (i=0; i < pkb3->num_keys; i++) {
|
|
if (!pkb3->keys[i].value) {
|
|
continue;
|
|
}
|
|
status = add_to_keytab_entries(mem_ctx, ctx, kvno, name,
|
|
NULL,
|
|
pkb3->keys[i].keytype,
|
|
*pkb3->keys[i].value);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
}
|
|
for (i=0; i < pkb3->num_old_keys; i++) {
|
|
if (!pkb3->old_keys[i].value) {
|
|
continue;
|
|
}
|
|
status = add_to_keytab_entries(mem_ctx, ctx, kvno - 1,
|
|
name,
|
|
NULL,
|
|
pkb3->old_keys[i].keytype,
|
|
*pkb3->old_keys[i].value);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((kvno < 0) && (kvno < pwd_history_len)) {
|
|
return status;
|
|
}
|
|
|
|
/* add password history */
|
|
|
|
/* skip first entry */
|
|
if (got_pwd) {
|
|
kvno--;
|
|
i = 1;
|
|
} else {
|
|
i = 0;
|
|
}
|
|
|
|
for (; i<pwd_history_len; i++) {
|
|
status = add_to_keytab_entries(mem_ctx, ctx, kvno--, name, NULL,
|
|
ENCTYPE_ARCFOUR_HMAC,
|
|
data_blob_talloc(mem_ctx, &pwd_history[i*16], 16));
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static bool dn_is_in_object_list(struct dssync_context *ctx,
|
|
const char *dn)
|
|
{
|
|
uint32_t count;
|
|
|
|
if (ctx->object_count == 0) {
|
|
return true;
|
|
}
|
|
|
|
for (count = 0; count < ctx->object_count; count++) {
|
|
if (strequal(ctx->object_dns[count], dn)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/****************************************************************
|
|
****************************************************************/
|
|
|
|
static NTSTATUS keytab_process_objects(struct dssync_context *ctx,
|
|
TALLOC_CTX *mem_ctx,
|
|
struct drsuapi_DsReplicaObjectListItemEx *cur,
|
|
struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr)
|
|
{
|
|
NTSTATUS status = NT_STATUS_OK;
|
|
struct libnet_keytab_context *keytab_ctx =
|
|
(struct libnet_keytab_context *)ctx->private_data;
|
|
|
|
for (; cur; cur = cur->next_object) {
|
|
/*
|
|
* When not in single object replication mode,
|
|
* the object_dn list is used as a positive write filter.
|
|
*/
|
|
if (!ctx->single_object_replication &&
|
|
!dn_is_in_object_list(ctx, cur->object.identifier->dn))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
status = parse_object(mem_ctx, keytab_ctx, cur);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
#else
|
|
|
|
static NTSTATUS keytab_startup(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
|
|
struct replUpToDateVectorBlob **pold_utdv)
|
|
{
|
|
return NT_STATUS_NOT_SUPPORTED;
|
|
}
|
|
|
|
static NTSTATUS keytab_finish(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
|
|
struct replUpToDateVectorBlob *new_utdv)
|
|
{
|
|
return NT_STATUS_NOT_SUPPORTED;
|
|
}
|
|
|
|
static NTSTATUS keytab_process_objects(struct dssync_context *ctx,
|
|
TALLOC_CTX *mem_ctx,
|
|
struct drsuapi_DsReplicaObjectListItemEx *cur,
|
|
struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr)
|
|
{
|
|
return NT_STATUS_NOT_SUPPORTED;
|
|
}
|
|
#endif /* defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC) */
|
|
|
|
const struct dssync_ops libnet_dssync_keytab_ops = {
|
|
.startup = keytab_startup,
|
|
.process_objects = keytab_process_objects,
|
|
.finish = keytab_finish,
|
|
};
|