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samba-mirror/source3/winbindd/idmap.c
2010-08-26 00:20:29 +02:00

646 lines
15 KiB
C

/*
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
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"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP
static_decl_idmap;
static void idmap_init(void)
{
static bool initialized;
if (initialized) {
return;
}
DEBUG(10, ("idmap_init(): calling static_init_idmap\n"));
static_init_idmap;
initialized = true;
}
/**
* Pointer to the backend methods. Modules register themselves here via
* smb_register_idmap.
*/
struct idmap_backend {
const char *name;
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_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() );
}
bool idmap_is_online(void)
{
return !idmap_is_offline();
}
/**********************************************************************
Allow a module to register itself as a method.
**********************************************************************/
NTSTATUS smb_register_idmap(int version, const char *name,
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(0,("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;
}
static int close_domain_destructor(struct idmap_domain *dom)
{
NTSTATUS ret;
ret = dom->methods->close_fn(dom);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(3, ("Failed to close idmap domain [%s]!\n", dom->name));
}
return 0;
}
static bool parse_idmap_module(TALLOC_CTX *mem_ctx, const char *param,
char **pmodulename, char **pargs)
{
char *modulename;
char *args;
if (strncmp(param, "idmap_", 6) == 0) {
param += 6;
DEBUG(1, ("idmap_init: idmap backend uses deprecated "
"'idmap_' prefix. Please replace 'idmap_%s' by "
"'%s'\n", param, param));
}
modulename = talloc_strdup(mem_ctx, param);
if (modulename == NULL) {
return false;
}
args = strchr(modulename, ':');
if (args == NULL) {
*pmodulename = modulename;
*pargs = NULL;
return true;
}
*args = '\0';
args = talloc_strdup(mem_ctx, args+1);
if (args == NULL) {
TALLOC_FREE(modulename);
return false;
}
*pmodulename = modulename;
*pargs = args;
return true;
}
/**
* 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] params parameter to pass to the init function
* @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,
const char *params,
bool check_range)
{
struct idmap_domain *result;
NTSTATUS status;
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;
}
/*
* load ranges and read only information from the config
*/
if (strequal(result->name, "*")) {
/*
* The default domain "*" is configured differently
* from named domains.
*/
uid_t low_uid = 0;
uid_t high_uid = 0;
gid_t low_gid = 0;
gid_t high_gid = 0;
result->low_id = 0;
result->high_id = 0;
if (!lp_idmap_uid(&low_uid, &high_uid)) {
DEBUG(1, ("'idmap uid' not set!\n"));
if (check_range) {
goto fail;
}
}
result->low_id = low_uid;
result->high_id = high_uid;
if (!lp_idmap_gid(&low_gid, &high_gid)) {
DEBUG(1, ("'idmap gid' not set!\n"));
if (check_range) {
goto fail;
}
}
if ((low_gid != low_uid) || (high_gid != high_uid)) {
DEBUG(1, ("Warning: 'idmap uid' and 'idmap gid'"
" ranges do not agree -- building "
"intersection\n"));
result->low_id = MAX(result->low_id, low_gid);
result->high_id = MIN(result->high_id, high_gid);
}
result->read_only = lp_idmap_read_only();
} else {
char *config_option = NULL;
const char *range;
config_option = talloc_asprintf(result, "idmap config %s",
result->name);
if (config_option == NULL) {
DEBUG(0, ("Out of memory!\n"));
goto fail;
}
range = lp_parm_const_string(-1, config_option, "range", NULL);
if (range == NULL) {
DEBUG(1, ("idmap range not specified for domain %s\n",
result ->name));
if (check_range) {
goto fail;
}
} else if (sscanf(range, "%u - %u", &result->low_id,
&result->high_id) != 2)
{
DEBUG(1, ("invalid range '%s' specified for domain "
"'%s'\n", range, result->name));
if (check_range) {
goto fail;
}
}
result->read_only = lp_parm_bool(-1, config_option, "read only",
false);
talloc_free(config_option);
}
if (result->low_id > result->high_id) {
DEBUG(1, ("Error: invalid idmap range detected: %lu - %lu\n",
(unsigned long)result->low_id,
(unsigned long)result->high_id));
if (check_range) {
goto fail;
}
}
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;
}
status = result->methods->init(result, params);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("idmap initialization returned %s\n",
nt_errstr(status)));
goto fail;
}
talloc_set_destructor(result, close_domain_destructor);
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
/**
* Initialize the default domain structure
* @param[in] mem_ctx memory context for the result
* @result The default domain structure
*
* This routine takes the module name from the "idmap backend" parameter,
* passing a possible parameter like ldap:ldap://ldap-url/ to the module.
*/
static struct idmap_domain *idmap_init_default_domain(TALLOC_CTX *mem_ctx)
{
struct idmap_domain *result;
char *modulename;
char *params;
idmap_init();
if (!parse_idmap_module(talloc_tos(), lp_idmap_backend(), &modulename,
&params)) {
DEBUG(1, ("parse_idmap_module failed\n"));
return NULL;
}
DEBUG(3, ("idmap_init: using '%s' as remote backend\n", modulename));
result = idmap_init_domain(mem_ctx, "*", modulename, params, true);
if (result == NULL) {
goto fail;
}
TALLOC_FREE(modulename);
TALLOC_FREE(params);
return result;
fail:
TALLOC_FREE(modulename);
TALLOC_FREE(params);
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;
char *config_option;
const char *backend;
config_option = talloc_asprintf(talloc_tos(), "idmap config %s",
domname);
if (config_option == NULL) {
DEBUG(0, ("talloc failed\n"));
goto fail;
}
backend = lp_parm_const_string(-1, config_option, "backend", NULL);
if (backend == NULL) {
DEBUG(1, ("no backend defined for %s\n", config_option));
goto fail;
}
result = idmap_init_domain(mem_ctx, domname, backend, NULL, true);
if (result == NULL) {
goto fail;
}
TALLOC_FREE(config_option);
return result;
fail:
TALLOC_FREE(config_option);
TALLOC_FREE(result);
return NULL;
}
/**
* Initialize the passdb domain structure
* @param[in] mem_ctx memory context for the result
* @result The default domain structure
*
* No config, passdb has its own configuration.
*/
static struct idmap_domain *idmap_init_passdb_domain(TALLOC_CTX *mem_ctx)
{
idmap_init();
if (passdb_idmap_domain != NULL) {
return passdb_idmap_domain;
}
passdb_idmap_domain = idmap_init_domain(NULL, get_global_sam_name(),
"passdb", NULL, false);
if (passdb_idmap_domain == NULL) {
DEBUG(1, ("Could not init passdb idmap domain\n"));
}
return passdb_idmap_domain;
}
/**
* 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.
*/
static struct idmap_domain *idmap_find_domain(const char *domname)
{
struct idmap_domain *result;
int i;
DEBUG(10, ("idmap_find_domain called for domain '%s'\n",
domname?domname:"NULL"));
/*
* Always init the default domain, we can't go without one
*/
if (default_idmap_domain == NULL) {
default_idmap_domain = idmap_init_default_domain(NULL);
}
if (default_idmap_domain == NULL) {
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];
}
}
if (idmap_domains == NULL) {
/*
* talloc context for all idmap domains
*/
idmap_domains = TALLOC_ARRAY(NULL, struct idmap_domain *, 1);
}
if (idmap_domains == NULL) {
DEBUG(0, ("talloc failed\n"));
return NULL;
}
result = idmap_init_named_domain(idmap_domains, domname);
if (result == NULL) {
/*
* Could not init that domain -- try the default one
*/
return default_idmap_domain;
}
ADD_TO_ARRAY(idmap_domains, struct idmap_domain *, result,
&idmap_domains, &num_domains);
return result;
}
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_backends_unixid_to_sid(const char *domname, struct id_map *id)
{
struct idmap_domain *dom;
struct id_map *maps[2];
DEBUG(10, ("idmap_backend_unixid_to_sid: domain = '%s', xid = %d "
"(type %d)\n",
domname?domname:"NULL", id->xid.id, id->xid.type));
maps[0] = id;
maps[1] = NULL;
/*
* Always give passdb a chance first
*/
dom = idmap_init_passdb_domain(NULL);
if ((dom != NULL)
&& NT_STATUS_IS_OK(dom->methods->unixids_to_sids(dom, maps))
&& id->status == ID_MAPPED) {
return NT_STATUS_OK;
}
dom = idmap_find_domain(domname);
if (dom == NULL) {
return NT_STATUS_NONE_MAPPED;
}
return dom->methods->unixids_to_sids(dom, maps);
}
NTSTATUS idmap_backends_sid_to_unixid(const char *domain, struct id_map *id)
{
struct idmap_domain *dom;
struct id_map *maps[2];
DEBUG(10, ("idmap_backends_sid_to_unixid: domain = '%s', sid = [%s]\n",
domain?domain:"NULL", sid_string_dbg(id->sid)));
maps[0] = id;
maps[1] = NULL;
if (sid_check_is_in_builtin(id->sid)
|| (sid_check_is_in_our_domain(id->sid)))
{
NTSTATUS status;
DEBUG(10, ("asking passdb...\n"));
dom = idmap_init_passdb_domain(NULL);
if (dom == NULL) {
return NT_STATUS_NONE_MAPPED;
}
status = dom->methods->sids_to_unixids(dom, maps);
if (NT_STATUS_IS_OK(status) && id->status == ID_MAPPED) {
return status;
}
DEBUG(10, ("passdb could not map, asking backends...\n"));
}
dom = idmap_find_domain(domain);
if (dom == NULL) {
return NT_STATUS_NONE_MAPPED;
}
return dom->methods->sids_to_unixids(dom, maps);
}