net_vampire: add code to vampire a SAM database to a keytab file.

Guenther
(This used to be commit ee6e422c0e035aa4779fa718bb6f142827cc2de0)

1 files changed, 319 insertions, 0 deletions

diff --git a/source3/libnet/libnet_samsync_keytab.c b/source3/libnet/libnet_samsync_keytab.c
new file mode 100644
index 00000000000..2208a715633
--- /dev/null
+++ b/source3/libnet/libnet_samsync_keytab.c
@@ -0,0 +1,319 @@
+/*
+   Unix SMB/CIFS implementation.
+   dump the remote SAM using rpc samsync operations
+
+   Copyright (C) Guenther Deschner 2008.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "utils/net.h"
+
+#if defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC)
+
+/****************************************************************
+****************************************************************/
+
+struct samsync_keytab_entry {
+	const char *name;
+	const char *principal;
+	DATA_BLOB password;
+	uint32_t kvno;
+};
+
+struct samsync_keytab_context {
+	krb5_context context;
+	krb5_keytab keytab;
+	const char *keytab_name;
+	ADS_STRUCT *ads;
+	const char *dns_domain_name;
+	uint8_t zero_buf[16];
+	uint32_t count;
+	struct samsync_keytab_entry *entries;
+};
+
+/****************************************************************
+****************************************************************/
+
+static int keytab_close(struct samsync_keytab_context *ctx)
+{
+	if (!ctx) {
+		return 0;
+	}
+
+	if (ctx->keytab && ctx->context) {
+		krb5_kt_close(ctx->context, ctx->keytab);
+	}
+
+	if (ctx->context) {
+		krb5_free_context(ctx->context);
+	}
+
+	if (ctx->ads) {
+		ads_destroy(&ctx->ads);
+	}
+
+	TALLOC_FREE(ctx);
+
+	return 0;
+}
+
+/****************************************************************
+****************************************************************/
+
+static krb5_error_code keytab_init(TALLOC_CTX *mem_ctx,
+				   const char *keytab_name,
+				   struct samsync_keytab_context **ctx)
+{
+	krb5_error_code ret = 0;
+	krb5_context context = NULL;
+	krb5_keytab keytab = NULL;
+	const char *keytab_string = NULL;
+
+	struct samsync_keytab_context *r;
+
+	r = TALLOC_ZERO_P(mem_ctx, struct samsync_keytab_context);
+	if (!r) {
+		return ENOMEM;
+	}
+
+	talloc_set_destructor(r, keytab_close);
+
+	initialize_krb5_error_table();
+	ret = krb5_init_context(&context);
+	if (ret) {
+		DEBUG(1,("keytab_init: could not krb5_init_context: %s\n",
+			error_message(ret)));
+		return ret;
+	}
+
+	ret = smb_krb5_open_keytab(context, keytab_name, true, &keytab);
+	if (ret) {
+		DEBUG(1,("keytab_init: smb_krb5_open_keytab failed (%s)\n",
+			error_message(ret)));
+		krb5_free_context(context);
+		return ret;
+	}
+
+	ret = smb_krb5_keytab_name(mem_ctx, context, keytab, &keytab_string);
+	if (ret) {
+		krb5_kt_close(context, keytab);
+		krb5_free_context(context);
+		return ret;
+	}
+
+	r->context = context;
+	r->keytab = keytab;
+	r->keytab_name = keytab_string;
+
+	*ctx = r;
+
+	return 0;
+}
+
+/****************************************************************
+****************************************************************/
+
+static NTSTATUS keytab_ad_connect(TALLOC_CTX *mem_ctx,
+				  const char *domain_name,
+				  const char *username,
+				  const char *password,
+				  struct samsync_keytab_context *ctx)
+{
+	NTSTATUS status;
+	ADS_STATUS ad_status;
+	ADS_STRUCT *ads;
+	struct netr_DsRGetDCNameInfo *info = NULL;
+	const char *dc;
+
+	status = dsgetdcname(mem_ctx, NULL, domain_name, NULL, NULL, 0, &info);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	dc = strip_hostname(info->dc_unc);
+
+	ads = ads_init(NULL, domain_name, dc);
+	NT_STATUS_HAVE_NO_MEMORY(ads);
+
+	if (getenv(KRB5_ENV_CCNAME) == NULL) {
+		setenv(KRB5_ENV_CCNAME, "MEMORY:libnet_samsync_keytab", 1);
+	}
+
+	ads->auth.user_name = SMB_STRDUP(username);
+	ads->auth.password = SMB_STRDUP(password);
+
+	ad_status = ads_connect_user_creds(ads);
+	if (!ADS_ERR_OK(ad_status)) {
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	ctx->ads = ads;
+
+	ctx->dns_domain_name = talloc_strdup_upper(mem_ctx, ads->config.realm);
+	NT_STATUS_HAVE_NO_MEMORY(ctx->dns_domain_name);
+
+	return NT_STATUS_OK;
+}
+
+/****************************************************************
+****************************************************************/
+
+static krb5_error_code keytab_add(struct samsync_keytab_context *ctx)
+{
+	krb5_error_code ret = 0;
+	krb5_enctype enctypes[2] = { ENCTYPE_ARCFOUR_HMAC, 0 };
+	int i;
+
+	for (i=0; i<ctx->count; i++) {
+
+		struct samsync_keytab_entry *entry = &ctx->entries[i];
+		krb5_data password;
+		krb5_kvno kvno;
+
+		kvno = ads_get_kvno(ctx->ads, entry->name);
+
+		password.data = (char *)entry->password.data;
+		password.length = entry->password.length;
+
+		ret = smb_krb5_kt_add_entry(ctx->context,
+					    ctx->keytab,
+					    kvno,
+					    entry->principal,
+					    enctypes,
+					    password,
+					    true);
+		if (ret) {
+			DEBUG(1,("keytab_add: Failed to add entry to keytab file\n"));
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+/****************************************************************
+****************************************************************/
+
+static NTSTATUS fetch_sam_entry_keytab(TALLOC_CTX *mem_ctx,
+				       enum netr_SamDatabaseID database_id,
+				       uint32_t rid,
+				       struct netr_DELTA_USER *r,
+				       NTSTATUS status,
+				       struct samsync_keytab_context *ctx)
+{
+	uchar nt_passwd[16];
+	struct samsync_keytab_entry *entry;
+
+	if (memcmp(r->ntpassword.hash, ctx->zero_buf, 16) == 0) {
+		return NT_STATUS_OK;
+	}
+
+	entry = TALLOC_ZERO_P(mem_ctx, struct samsync_keytab_entry);
+	NT_STATUS_HAVE_NO_MEMORY(entry);
+
+	sam_pwd_hash(rid, r->ntpassword.hash, nt_passwd, 0);
+
+	entry->name = talloc_strdup(mem_ctx, r->account_name.string);
+	entry->principal = talloc_asprintf(mem_ctx, "%s@%s",
+					   r->account_name.string,
+					   ctx->dns_domain_name);
+	entry->password = data_blob_talloc(mem_ctx, nt_passwd, 16);
+
+	NT_STATUS_HAVE_NO_MEMORY(entry->name);
+	NT_STATUS_HAVE_NO_MEMORY(entry->principal);
+
+	ADD_TO_ARRAY(mem_ctx, struct samsync_keytab_entry, *entry,
+		     &ctx->entries, &ctx->count);
+
+	return NT_STATUS_OK;
+}
+
+/****************************************************************
+****************************************************************/
+
+NTSTATUS fetch_sam_entries_keytab(TALLOC_CTX *mem_ctx,
+				  enum netr_SamDatabaseID database_id,
+				  struct netr_DELTA_ENUM_ARRAY *r,
+				  NTSTATUS result,
+				  struct samsync_context *ctx)
+{
+	NTSTATUS status = NT_STATUS_OK;
+	krb5_error_code ret = 0;
+	struct samsync_keytab_context *keytab_ctx = NULL;
+	int i;
+
+	ret = keytab_init(mem_ctx, ctx->output_filename, &keytab_ctx);
+	if (ret) {
+		status = krb5_to_nt_status(ret);
+		goto out;
+	}
+
+	status = keytab_ad_connect(mem_ctx,
+				   ctx->domain_name,
+				   ctx->username,
+				   ctx->password,
+				   keytab_ctx);
+	if (!NT_STATUS_IS_OK(status)) {
+		goto out;
+	}
+
+	for (i = 0; i < r->num_deltas; i++) {
+
+		if (r->delta_enum[i].delta_type != NETR_DELTA_USER) {
+			continue;
+		}
+
+		status = fetch_sam_entry_keytab(mem_ctx, database_id,
+						r->delta_enum[i].delta_id_union.rid,
+						r->delta_enum[i].delta_union.user,
+						result,
+						keytab_ctx);
+		if (!NT_STATUS_IS_OK(status)) {
+			goto out;
+		}
+	}
+
+	ret = keytab_add(keytab_ctx);
+	if (ret) {
+		status = krb5_to_nt_status(ret);
+		ctx->error_message = talloc_asprintf(mem_ctx,
+			"Failed to add entries to keytab %s: %s",
+			keytab_ctx->keytab_name, error_message(ret));
+		goto out;
+	}
+
+	ctx->result_message = talloc_asprintf(mem_ctx,
+		"vampired %d accounts to keytab %s",
+		keytab_ctx->count,
+		keytab_ctx->keytab_name);
+ out:
+	TALLOC_FREE(keytab_ctx);
+
+	return status;
+}
+
+#else
+
+NTSTATUS fetch_sam_entries_keytab(TALLOC_CTX *mem_ctx,
+				  enum netr_SamDatabaseID database_id,
+				  struct netr_DELTA_ENUM_ARRAY *r,
+				  NTSTATUS result,
+				  struct samsync_context *ctx)
+{
+	return NT_STATUS_NOT_SUPPORTED;
+}
+
+#endif /* defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC) */