Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 632 insertions, 0 deletions

diff --git a/source3/winbindd/idmap.c b/source3/winbindd/idmap.c
new file mode 100644
index 0000000..eee2899
--- /dev/null
+++ b/source3/winbindd/idmap.c
@@ -0,0 +1,632 @@
+/*
+   Unix SMB/CIFS implementation.
+   ID Mapping
+   Copyright (C) Tim Potter 2000
+   Copyright (C) Jim McDonough <jmcd@us.ibm.com>	2003
+   Copyright (C) Simo Sorce 2003-2007
+   Copyright (C) Jeremy Allison 2006
+   Copyright (C) Michael Adam 2010
+
+   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 "winbindd.h"
+#include "idmap.h"
+#include "lib/util_sid_passdb.h"
+#include "libcli/security/dom_sid.h"
+#include "passdb.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_IDMAP
+
+static_decl_idmap;
+
+/**
+ * Pointer to the backend methods. Modules register themselves here via
+ * smb_register_idmap.
+ */
+
+struct idmap_backend {
+	const char *name;
+	const struct idmap_methods *methods;
+	struct idmap_backend *prev, *next;
+};
+static struct idmap_backend *backends = NULL;
+
+/**
+ * Default idmap domain configured via "idmap backend".
+ */
+static struct idmap_domain *default_idmap_domain;
+
+/**
+ * Passdb idmap domain, not configurable. winbind must always give passdb a
+ * chance to map ids.
+ */
+static struct idmap_domain *passdb_idmap_domain;
+
+/**
+ * List of specially configured idmap domains. This list is filled on demand
+ * in the winbind idmap child when the parent winbind figures out via the
+ * special range parameter or via the domain SID that a special "idmap config
+ * domain" configuration is present.
+ */
+static struct idmap_domain **idmap_domains = NULL;
+static int num_domains = 0;
+
+static struct idmap_domain *idmap_init_named_domain(TALLOC_CTX *mem_ctx,
+						    const char *domname);
+static struct idmap_domain *idmap_init_domain(TALLOC_CTX *mem_ctx,
+					      const char *domainname,
+					      const char *modulename,
+					      bool check_range);
+
+struct lp_scan_idmap_domains_state {
+	bool (*fn)(const char *domname, void *private_data);
+	void *private_data;
+};
+
+static bool lp_scan_idmap_found_domain(
+	const char *string, regmatch_t matches[], void *private_data);
+
+bool lp_scan_idmap_domains(bool (*fn)(const char *domname,
+				      void *private_data),
+			   void *private_data)
+{
+	struct lp_scan_idmap_domains_state state = {
+		.fn = fn, .private_data = private_data };
+	int ret;
+
+	ret = lp_wi_scan_global_parametrics(
+		"idmapconfig\\(.*\\):backend", 2,
+		lp_scan_idmap_found_domain, &state);
+	if (ret != 0) {
+		DBG_WARNING("wi_scan_global_parametrics returned %d\n", ret);
+		return false;
+	}
+
+	return true;
+}
+
+static bool lp_scan_idmap_found_domain(
+	const char *string, regmatch_t matches[], void *private_data)
+{
+	bool ok;
+
+	if (matches[1].rm_so == -1) {
+		DBG_WARNING("Found match, but no name??\n");
+		return false;
+	}
+	if (matches[1].rm_eo <= matches[1].rm_so) {
+		DBG_WARNING("Invalid match\n");
+		return false;
+	}
+
+	{
+		struct lp_scan_idmap_domains_state *state = private_data;
+		regoff_t len = matches[1].rm_eo - matches[1].rm_so;
+		char domname[len+1];
+
+		memcpy(domname, string + matches[1].rm_so, len);
+		domname[len] = '\0';
+
+		DBG_DEBUG("Found idmap domain \"%s\"\n", domname);
+
+		ok = state->fn(domname, state->private_data);
+	}
+
+	return ok;
+}
+
+static bool idmap_found_domain_backend(const char *domname,
+				       void *private_data);
+
+static bool idmap_init(void)
+{
+	static bool initialized;
+	bool ok;
+
+	if (initialized) {
+		return true;
+	}
+
+	DEBUG(10, ("idmap_init(): calling static_init_idmap\n"));
+
+	static_init_idmap(NULL);
+
+	initialized = true;
+
+	if (!pdb_is_responsible_for_everything_else()) {
+		default_idmap_domain = idmap_init_named_domain(NULL, "*");
+		if (default_idmap_domain == NULL) {
+			return false;
+		}
+	}
+
+	passdb_idmap_domain = idmap_init_domain(
+		NULL, get_global_sam_name(), "passdb", false);
+	if (passdb_idmap_domain == NULL) {
+		TALLOC_FREE(default_idmap_domain);
+		return false;
+	}
+
+	idmap_domains = talloc_array(NULL, struct idmap_domain *, 0);
+	if (idmap_domains == NULL) {
+		TALLOC_FREE(passdb_idmap_domain);
+		TALLOC_FREE(default_idmap_domain);
+		return false;
+	}
+
+	ok = lp_scan_idmap_domains(idmap_found_domain_backend, NULL);
+	if (!ok) {
+		DBG_WARNING("lp_scan_idmap_domains failed\n");
+		return false;
+	}
+
+	return true;
+}
+
+const char *idmap_config_const_string(const char *domname, const char *option,
+				      const char *def)
+{
+	int len = snprintf(NULL, 0, "idmap config %s", domname);
+
+	if (len == -1) {
+		return NULL;
+	}
+	{
+		char config_option[len+1];
+		snprintf(config_option, sizeof(config_option),
+			 "idmap config %s", domname);
+		return lp_parm_const_string(-1, config_option, option, def);
+	}
+}
+
+bool idmap_config_bool(const char *domname, const char *option, bool def)
+{
+	int len = snprintf(NULL, 0, "idmap config %s", domname);
+
+	if (len == -1) {
+		return def;
+	}
+	{
+		char config_option[len+1];
+		snprintf(config_option, sizeof(config_option),
+			 "idmap config %s", domname);
+		return lp_parm_bool(-1, config_option, option, def);
+	}
+}
+
+int idmap_config_int(const char *domname, const char *option, int def)
+{
+	int len = snprintf(NULL, 0, "idmap config %s", domname);
+
+	if (len == -1) {
+		return def;
+	}
+	{
+		char config_option[len+1];
+		snprintf(config_option, sizeof(config_option),
+			 "idmap config %s", domname);
+		return lp_parm_int(-1, config_option, option, def);
+	}
+}
+
+bool domain_has_idmap_config(const char *domname)
+{
+	int i;
+	const char *range = NULL;
+	const char *backend = NULL;
+	bool ok;
+
+	ok = idmap_init();
+	if (!ok) {
+		return false;
+	}
+
+	for (i=0; i<num_domains; i++) {
+		if (strequal(idmap_domains[i]->name, domname)) {
+			return true;
+		}
+	}
+
+	/* fallback: also check loadparm */
+
+	range = idmap_config_const_string(domname, "range", NULL);
+	backend = idmap_config_const_string(domname, "backend", NULL);
+	if (range != NULL && backend != NULL) {
+		DEBUG(5, ("idmap configuration specified for domain '%s'\n",
+			domname));
+		return true;
+	}
+
+	return false;
+}
+
+static bool idmap_found_domain_backend(const char *domname,
+				       void *private_data)
+{
+	struct idmap_domain *dom, **tmp;
+
+	DBG_DEBUG("Found idmap domain \"%s\"\n", domname);
+
+	if (strcmp(domname, "*") == 0) {
+		return false;
+	}
+
+	dom = idmap_init_named_domain(idmap_domains, domname);
+	if (dom == NULL) {
+		DBG_NOTICE("Could not init idmap domain %s\n", domname);
+		return false;
+	}
+
+	tmp = talloc_realloc(idmap_domains, idmap_domains,
+			     struct idmap_domain *, num_domains + 1);
+	if (tmp == NULL) {
+		DBG_WARNING("talloc_realloc failed\n");
+		TALLOC_FREE(dom);
+		return false;
+	}
+	idmap_domains = tmp;
+	idmap_domains[num_domains] = dom;
+	num_domains += 1;
+
+	return false;
+}
+
+static const struct idmap_methods *get_methods(const char *name)
+{
+	struct idmap_backend *b;
+
+	for (b = backends; b; b = b->next) {
+		if (strequal(b->name, name)) {
+			return b->methods;
+		}
+	}
+
+	return NULL;
+}
+
+bool idmap_is_offline(void)
+{
+	return ( lp_winbind_offline_logon() &&
+	     get_global_winbindd_state_offline() );
+}
+
+/**********************************************************************
+ Allow a module to register itself as a method.
+**********************************************************************/
+
+NTSTATUS smb_register_idmap(int version, const char *name,
+			    const struct idmap_methods *methods)
+{
+	struct idmap_backend *entry;
+
+ 	if ((version != SMB_IDMAP_INTERFACE_VERSION)) {
+		DEBUG(0, ("Failed to register idmap module.\n"
+		          "The module was compiled against "
+			  "SMB_IDMAP_INTERFACE_VERSION %d,\n"
+		          "current SMB_IDMAP_INTERFACE_VERSION is %d.\n"
+		          "Please recompile against the current version "
+			  "of samba!\n",
+			  version, SMB_IDMAP_INTERFACE_VERSION));
+		return NT_STATUS_OBJECT_TYPE_MISMATCH;
+  	}
+
+	if (!name || !name[0] || !methods) {
+		DEBUG(0,("Called with NULL pointer or empty name!\n"));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	for (entry = backends; entry != NULL; entry = entry->next) {
+		if (strequal(entry->name, name)) {
+			DEBUG(5,("Idmap module %s already registered!\n",
+				 name));
+			return NT_STATUS_OBJECT_NAME_COLLISION;
+		}
+	}
+
+	entry = talloc(NULL, struct idmap_backend);
+	if ( ! entry) {
+		DEBUG(0,("Out of memory!\n"));
+		TALLOC_FREE(entry);
+		return NT_STATUS_NO_MEMORY;
+	}
+	entry->name = talloc_strdup(entry, name);
+	if ( ! entry->name) {
+		DEBUG(0,("Out of memory!\n"));
+		TALLOC_FREE(entry);
+		return NT_STATUS_NO_MEMORY;
+	}
+	entry->methods = methods;
+
+	DLIST_ADD(backends, entry);
+	DEBUG(5, ("Successfully added idmap backend '%s'\n", name));
+	return NT_STATUS_OK;
+}
+
+/**
+ * Initialize a domain structure
+ * @param[in] mem_ctx		memory context for the result
+ * @param[in] domainname	which domain is this for
+ * @param[in] modulename	which backend module
+ * @param[in] check_range	whether range checking should be done
+ * @result The initialized structure
+ */
+static struct idmap_domain *idmap_init_domain(TALLOC_CTX *mem_ctx,
+					      const char *domainname,
+					      const char *modulename,
+					      bool check_range)
+{
+	struct idmap_domain *result;
+	NTSTATUS status;
+	const char *range;
+	unsigned low_id = 0;
+	unsigned high_id = 0;
+
+	result = talloc_zero(mem_ctx, struct idmap_domain);
+	if (result == NULL) {
+		DEBUG(0, ("talloc failed\n"));
+		return NULL;
+	}
+
+	result->name = talloc_strdup(result, domainname);
+	if (result->name == NULL) {
+		DEBUG(0, ("talloc failed\n"));
+		goto fail;
+	}
+
+	/*
+	 * Check whether the requested backend module exists and
+	 * load the methods.
+	 */
+
+	result->methods = get_methods(modulename);
+	if (result->methods == NULL) {
+		DEBUG(3, ("idmap backend %s not found\n", modulename));
+
+		status = smb_probe_module("idmap", modulename);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(3, ("Could not probe idmap module %s\n",
+				  modulename));
+			goto fail;
+		}
+
+		result->methods = get_methods(modulename);
+	}
+	if (result->methods == NULL) {
+		DEBUG(1, ("idmap backend %s not found\n", modulename));
+		goto fail;
+	}
+
+	/*
+	 * load ranges and read only information from the config
+	 */
+
+	result->read_only = idmap_config_bool(result->name, "read only", false);
+	range = idmap_config_const_string(result->name, "range", NULL);
+
+	if (range == NULL) {
+		if (check_range) {
+			DEBUG(1, ("idmap range not specified for domain %s\n",
+				  result->name));
+			goto fail;
+		}
+	} else if (sscanf(range, "%u - %u", &low_id, &high_id) != 2)
+	{
+		DEBUG(1, ("invalid range '%s' specified for domain "
+			  "'%s'\n", range, result->name));
+		if (check_range) {
+			goto fail;
+		}
+	} else if (low_id > high_id) {
+		DEBUG(1, ("Error: invalid idmap range detected: %u - %u\n",
+			  low_id, high_id));
+		if (check_range) {
+			goto fail;
+		}
+	}
+
+	result->low_id = low_id;
+	result->high_id = high_id;
+
+	status = result->methods->init(result);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("idmap initialization returned %s\n",
+			  nt_errstr(status)));
+		goto fail;
+	}
+
+	return result;
+
+fail:
+	TALLOC_FREE(result);
+	return NULL;
+}
+
+/**
+ * Initialize a named domain structure
+ * @param[in] mem_ctx		memory context for the result
+ * @param[in] domname		the domain name
+ * @result The default domain structure
+ *
+ * This routine looks at the "idmap config <domname>" parameters to figure out
+ * the configuration.
+ */
+
+static struct idmap_domain *idmap_init_named_domain(TALLOC_CTX *mem_ctx,
+						    const char *domname)
+{
+	struct idmap_domain *result = NULL;
+	const char *backend;
+	bool ok;
+
+	ok = idmap_init();
+	if (!ok) {
+		return NULL;
+	}
+
+	backend = idmap_config_const_string(domname, "backend", NULL);
+	if (backend == NULL) {
+		DEBUG(10, ("no idmap backend configured for domain '%s'\n",
+			   domname));
+		goto fail;
+	}
+
+	result = idmap_init_domain(mem_ctx, domname, backend, true);
+	if (result == NULL) {
+		goto fail;
+	}
+
+	return result;
+
+fail:
+	TALLOC_FREE(result);
+	return NULL;
+}
+
+/**
+ * Find a domain struct according to a domain name
+ * @param[in] domname		Domain name to get the config for
+ * @result The default domain structure that fits
+ *
+ * This is the central routine in the winbindd-idmap child to pick the correct
+ * domain for looking up IDs. If domname is NULL or empty, we use the default
+ * domain. If it contains something, we try to use idmap_init_named_domain()
+ * to fetch the correct backend.
+ *
+ * The choice about "domname" is being made by the winbind parent, look at the
+ * "have_idmap_config" of "struct winbindd_domain" which is set in
+ * add_trusted_domain.
+ */
+
+struct idmap_domain *idmap_find_domain(const char *domname)
+{
+	bool ok;
+	int i;
+
+	DEBUG(10, ("idmap_find_domain called for domain '%s'\n",
+		   domname?domname:"NULL"));
+
+	ok = idmap_init();
+	if (!ok) {
+		return NULL;
+	}
+
+	if ((domname == NULL) || (domname[0] == '\0')) {
+		return default_idmap_domain;
+	}
+
+	for (i=0; i<num_domains; i++) {
+		if (strequal(idmap_domains[i]->name, domname)) {
+			return idmap_domains[i];
+		}
+	}
+
+	return default_idmap_domain;
+}
+
+struct idmap_domain *idmap_find_domain_with_sid(const char *domname,
+						const struct dom_sid *sid)
+{
+	bool ok;
+
+	ok = idmap_init();
+	if (!ok) {
+		return NULL;
+	}
+
+	if (sid_check_is_for_passdb(sid)) {
+		return passdb_idmap_domain;
+	}
+
+	return idmap_find_domain(domname);
+}
+
+void idmap_close(void)
+{
+	TALLOC_FREE(default_idmap_domain);
+	TALLOC_FREE(passdb_idmap_domain);
+	TALLOC_FREE(idmap_domains);
+	num_domains = 0;
+}
+
+/**************************************************************************
+ idmap allocator interface functions
+**************************************************************************/
+
+static NTSTATUS idmap_allocate_unixid(struct unixid *id)
+{
+	struct idmap_domain *dom;
+	NTSTATUS ret;
+
+	dom = idmap_find_domain(NULL);
+
+	if (dom == NULL) {
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	if (dom->methods->allocate_id == NULL) {
+		return NT_STATUS_NOT_IMPLEMENTED;
+	}
+
+	ret = dom->methods->allocate_id(dom, id);
+
+	return ret;
+}
+
+
+NTSTATUS idmap_allocate_uid(struct unixid *id)
+{
+	id->type = ID_TYPE_UID;
+	return idmap_allocate_unixid(id);
+}
+
+NTSTATUS idmap_allocate_gid(struct unixid *id)
+{
+	id->type = ID_TYPE_GID;
+	return idmap_allocate_unixid(id);
+}
+
+NTSTATUS idmap_backend_unixids_to_sids(struct id_map **maps,
+				       const char *domain_name,
+				       struct dom_sid domain_sid)
+{
+	struct idmap_domain *dom = NULL;
+	NTSTATUS status;
+	bool ok;
+
+	ok = idmap_init();
+	if (!ok) {
+		return NT_STATUS_NONE_MAPPED;
+	}
+
+	if (strequal(domain_name, get_global_sam_name())) {
+		dom = passdb_idmap_domain;
+	}
+	if (dom == NULL) {
+		dom = idmap_find_domain(domain_name);
+	}
+	if (dom == NULL) {
+		return NT_STATUS_NONE_MAPPED;
+	}
+
+	dom->dom_sid = domain_sid;
+	status = dom->methods->unixids_to_sids(dom, maps);
+
+	DBG_DEBUG("unixid_to_sids for domain %s returned %s\n",
+		  domain_name, nt_errstr(status));
+
+	return status;
+}