1 files changed, 275 insertions, 0 deletions
diff --git a/source3/registry/reg_backend_smbconf.c b/source3/registry/reg_backend_smbconf.c
new file mode 100644
index 0000000000..a6e478200f
--- /dev/null
+++ b/source3/registry/reg_backend_smbconf.c
@@ -0,0 +1,275 @@
+/*
+ *  Unix SMB/CIFS implementation.
+ *  Virtual Windows Registry Layer
+ *  Copyright (C) Volker Lendecke 2006
+ *  Copyright (C) Michael Adam 2007
+ *
+ *  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"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_REGISTRY
+
+extern REGISTRY_OPS regdb_ops;		/* these are the default */
+
+static int smbconf_fetch_keys( const char *key, REGSUBKEY_CTR *subkey_ctr )
+{
+	return regdb_ops.fetch_subkeys(key, subkey_ctr);
+}
+
+static bool smbconf_store_keys( const char *key, REGSUBKEY_CTR *subkeys )
+{
+	return regdb_ops.store_subkeys(key, subkeys);
+}
+
+static int smbconf_fetch_values( const char *key, REGVAL_CTR *val )
+{
+	return regdb_ops.fetch_values(key, val);
+}
+
+static WERROR regval_hilvl_to_lolvl(TALLOC_CTX *mem_ctx, const char *valname,
+				    struct registry_value *src,
+				    REGISTRY_VALUE **dst)
+{
+	WERROR err;
+	DATA_BLOB value_data;
+	REGISTRY_VALUE *newval = NULL;
+
+	if (dst == NULL) {
+		return WERR_INVALID_PARAM;
+	}
+
+	err = registry_push_value(mem_ctx, src, &value_data);
+	if (!W_ERROR_IS_OK(err)) {
+		DEBUG(10, ("error calling registry_push_value.\n"));
+		return err;
+	}
+
+	newval = regval_compose(mem_ctx, valname, src->type,
+				(char *)value_data.data, value_data.length);
+	if (newval == NULL) {
+		DEBUG(10, ("error composing registry value. (no memory?)\n"));
+		return WERR_NOMEM;
+	}
+
+	*dst = newval;
+	return WERR_OK;
+}
+
+static WERROR regval_lolvl_to_hilvl(TALLOC_CTX *mem_ctx, REGISTRY_VALUE *src,
+				    struct registry_value **dst)
+{
+	if (dst == NULL) {
+		return WERR_INVALID_PARAM;
+	}
+
+	return registry_pull_value(mem_ctx, dst, regval_type(src),
+				   regval_data_p(src), regval_size(src),
+				   regval_size(src));
+}
+
+/*
+ * Utility function used by smbconf_store_values to canonicalize
+ * a registry value.
+ * registry_pull_value / registry_push_value are used for (un)marshalling.
+ */
+static REGISTRY_VALUE *smbconf_canonicalize_regval(TALLOC_CTX *mem_ctx,
+						   REGISTRY_VALUE *theval)
+{
+	char *valstr;
+	size_t len;
+	const char *canon_valname;
+	const char *canon_valstr;
+	bool inverse;
+	struct registry_value *value;
+	WERROR err;
+	TALLOC_CTX *tmp_ctx;
+	REGISTRY_VALUE *newval = NULL;
+
+	if (!lp_parameter_is_valid(regval_name(theval)) ||
+	    lp_parameter_is_canonical(regval_name(theval)))
+	{
+		return theval;
+	}
+
+	tmp_ctx = talloc_stackframe();
+	if (tmp_ctx == NULL) {
+		DEBUG(1, ("out of memory...\n"));
+		goto done;
+	}
+
+	err = regval_lolvl_to_hilvl(tmp_ctx, theval, &value);
+	if (!W_ERROR_IS_OK(err)) {
+		goto done;
+	}
+
+	/* we need the value-string zero-terminated */
+	valstr = value->v.sz.str;
+	len = value->v.sz.len;
+	if (valstr[len - 1] != '\0') {
+		DEBUG(10, ("string is not '\\0'-terminated. adding '\\0'.\n"));
+		valstr = TALLOC_REALLOC_ARRAY(tmp_ctx, valstr, char, len + 1);
+		if (valstr == NULL) {
+			DEBUG(1, ("out of memory\n"));
+			goto done;
+		}
+		valstr[len] = '\0';
+	}
+
+	if (!lp_canonicalize_parameter(regval_name(theval), &canon_valname,
+				       &inverse))
+	{
+		DEBUG(5, ("Error: lp_canonicalize_parameter failed after "
+			  "lp_parameter_is_valid. This should not happen!\n"));
+		goto done;
+	}
+	DEBUG(10, ("old value name: '%s', canonical value name: '%s'\n",
+		   regval_name(theval), canon_valname));
+	if (inverse && lp_string_is_valid_boolean(valstr)) {
+		lp_invert_boolean(valstr, &canon_valstr);
+	} else {
+		canon_valstr = valstr;
+	}
+
+	ZERO_STRUCTP(value);
+	value->type = REG_SZ;
+	value->v.sz.str = CONST_DISCARD(char *, canon_valstr);
+	value->v.sz.len = strlen(canon_valstr) + 1;
+
+	err = regval_hilvl_to_lolvl(mem_ctx, canon_valname, value, &newval);
+	if (!W_ERROR_IS_OK(err)) {
+		DEBUG(10, ("error calling regval_hilvl_to_lolvl.\n"));
+		goto done;
+	}
+
+done:
+	TALLOC_FREE(tmp_ctx);
+	return newval;
+}
+
+static bool smbconf_store_values( const char *key, REGVAL_CTR *val )
+{
+	int i;
+	int num_values = regval_ctr_numvals(val);
+	REGVAL_CTR *new_val_ctr;
+
+	/*
+	 * we build a second regval container and copy over the values,
+	 * possibly changing names to the canonical name, because when
+	 * canonicalizing parameter names and replacing the original parameter
+	 * (with reval_ctr_deletevalue and regval_ctr_addvalue) in the original
+	 * container, the order would change and that is not so good in the
+	 * "for" loop...  :-o
+	 */
+	new_val_ctr = TALLOC_ZERO_P(val, REGVAL_CTR);
+	if (new_val_ctr == NULL) {
+		DEBUG(1, ("out of memory\n"));
+		return False;
+	}
+
+	for (i=0; i < num_values; i++) {
+		REGISTRY_VALUE *theval = regval_ctr_specific_value(val, i);
+		const char *valname = regval_name(theval);
+		int res;
+
+		DEBUG(10, ("inspecting value '%s'\n", valname));
+
+		/* unfortunately, we can not reject names that are not
+		 * valid parameter names here, since e.g. regedit first
+		 * creates values as "New Value #1" and so on and then
+		 * drops into rename. */
+
+		if (regval_type(theval) != REG_SZ) {
+			DEBUG(1, ("smbconf_store_values: only registry value "
+			      "type REG_SZ currently allowed under key "
+			      "smbconf\n"));
+			return False;
+		}
+
+		if (registry_smbconf_valname_forbidden(valname)) {
+			DEBUG(1, ("smbconf_store_values: value '%s' forbidden "
+			      "in registry.\n", valname));
+			return False;
+		}
+
+		if (lp_parameter_is_valid(valname) &&
+		    !lp_parameter_is_canonical(valname))
+		{
+			DEBUG(5, ("valid parameter '%s' given but it is a "
+				  "synonym. going to canonicalize it.\n",
+				  valname));
+			theval = smbconf_canonicalize_regval(val, theval);
+			if (theval == NULL) {
+				DEBUG(10, ("error canonicalizing registry "
+					   "value\n"));
+				return False;
+			}
+		} else {
+			DEBUG(10, ("%s parameter found, "
+				   "copying it to new container...\n",
+				   (lp_parameter_is_valid(valname)?
+				    "valid":"unknown")));
+		}
+		res = regval_ctr_copyvalue(new_val_ctr, theval);
+		if (res == 0) {
+			DEBUG(10, ("error calling regval_ctr_copyvalue. "
+				   "(no memory?)\n"));
+			return False;
+		}
+		DEBUG(10, ("parameter copied. container now has %d values.\n",
+			   res));
+	}
+	return regdb_ops.store_values(key, new_val_ctr);
+}
+
+static bool smbconf_reg_access_check(const char *keyname, uint32 requested,
+				     uint32 *granted,
+				     const struct nt_user_token *token)
+{
+	if (!(user_has_privileges(token, &se_disk_operators))) {
+		return False;
+	}
+
+	*granted = REG_KEY_ALL;
+	return True;
+}
+
+static WERROR smbconf_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
+				  struct security_descriptor **psecdesc)
+{
+	return regdb_ops.get_secdesc(mem_ctx, key, psecdesc);
+}
+
+static WERROR smbconf_set_secdesc(const char *key,
+				  struct security_descriptor *secdesc)
+{
+	return regdb_ops.set_secdesc(key, secdesc);
+}
+
+
+/*
+ * Table of function pointers for accessing smb.conf data
+ */
+
+REGISTRY_OPS smbconf_reg_ops = {
+	.fetch_subkeys = smbconf_fetch_keys,
+	.fetch_values = smbconf_fetch_values,
+	.store_subkeys = smbconf_store_keys,
+	.store_values = smbconf_store_values,
+	.reg_access_check = smbconf_reg_access_check,
+	.get_secdesc = smbconf_get_secdesc,
+	.set_secdesc = smbconf_set_secdesc,
+};