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|
/*
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"
#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;
struct idmap_methods *methods;
struct idmap_backend *prev, *next;
};
static struct idmap_backend *backends = NULL;
/**
* Pointer to the alloc backend methods. Modules register themselves here via
* smb_register_idmap_alloc.
*/
struct idmap_alloc_backend {
const char *name;
struct idmap_alloc_methods *methods;
struct idmap_alloc_backend *prev, *next;
};
static struct idmap_alloc_backend *alloc_backends = NULL;
/**
* The idmap alloc context that is configured via "idmap alloc
* backend". Defaults to "idmap backend" in case the module (tdb, ldap) also
* provides alloc methods.
*/
struct idmap_alloc_context {
struct idmap_alloc_methods *methods;
};
static struct idmap_alloc_context *idmap_alloc_ctx = 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;
}
static struct idmap_alloc_methods *get_alloc_methods(const char *name)
{
struct idmap_alloc_backend *b;
for (b = alloc_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;
}
/**********************************************************************
Allow a module to register itself as an alloc method.
**********************************************************************/
NTSTATUS smb_register_idmap_alloc(int version, const char *name,
struct idmap_alloc_methods *methods)
{
struct idmap_alloc_methods *test;
struct idmap_alloc_backend *entry;
if ((version != SMB_IDMAP_INTERFACE_VERSION)) {
DEBUG(0, ("Failed to register idmap alloc 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;
}
test = get_alloc_methods(name);
if (test) {
DEBUG(0,("idmap_alloc module %s already registered!\n", name));
return NT_STATUS_OBJECT_NAME_COLLISION;
}
entry = talloc(NULL, struct idmap_alloc_backend);
if ( ! entry) {
DEBUG(0,("Out of memory!\n"));
return NT_STATUS_NO_MEMORY;
}
entry->name = talloc_strdup(entry, name);
if ( ! entry->name) {
DEBUG(0,("Out of memory!\n"));
return NT_STATUS_NO_MEMORY;
}
entry->methods = methods;
DLIST_ADD(alloc_backends, entry);
DEBUG(5, ("Successfully added idmap alloc 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
* @result The initialized structure
*/
static struct idmap_domain *idmap_init_domain(TALLOC_CTX *mem_ctx,
const char *domainname,
const char *modulename,
const char *params)
{
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;
}
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;
DEBUG(10, ("idmap_init_default_domain: calling static_init_idmap\n"));
static_init_idmap;
if (!parse_idmap_module(talloc_tos(), lp_idmap_backend(), &modulename,
¶ms)) {
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);
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);
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)
{
DEBUG(10, ("idmap_init_passdb_domain: calling static_init_idmap\n"));
static_init_idmap;
if (passdb_idmap_domain != NULL) {
return passdb_idmap_domain;
}
passdb_idmap_domain = idmap_init_domain(NULL, get_global_sam_name(),
"passdb", NULL);
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)
{
if (idmap_alloc_ctx) {
idmap_alloc_ctx->methods->close_fn();
idmap_alloc_ctx->methods = NULL;
}
alloc_backends = NULL;
TALLOC_FREE(default_idmap_domain);
TALLOC_FREE(passdb_idmap_domain);
TALLOC_FREE(idmap_domains);
num_domains = 0;
}
/**
* Initialize the idmap alloc backend
* @param[out] ctx Where to put the alloc_ctx?
* @result Did it work fine?
*
* This routine first looks at "idmap alloc backend" and if that is not
* defined, it uses "idmap backend" for the module name.
*/
static NTSTATUS idmap_alloc_init(struct idmap_alloc_context **ctx)
{
const char *backend;
char *modulename, *params;
NTSTATUS ret = NT_STATUS_NO_MEMORY;;
static_init_idmap;
if (idmap_alloc_ctx != NULL) {
*ctx = idmap_alloc_ctx;
return NT_STATUS_OK;
}
idmap_alloc_ctx = talloc(NULL, struct idmap_alloc_context);
if (idmap_alloc_ctx == NULL) {
DEBUG(0, ("talloc failed\n"));
goto fail;
}
backend = lp_idmap_alloc_backend();
if ((backend == NULL) || (backend[0] == '\0')) {
backend = lp_idmap_backend();
}
if (backend == NULL) {
DEBUG(3, ("no idmap alloc backend defined\n"));
ret = NT_STATUS_INVALID_PARAMETER;
goto fail;
}
if (!parse_idmap_module(idmap_alloc_ctx, backend, &modulename,
¶ms)) {
DEBUG(1, ("parse_idmap_module %s failed\n", backend));
goto fail;
}
idmap_alloc_ctx->methods = get_alloc_methods(modulename);
if (idmap_alloc_ctx->methods == NULL) {
ret = smb_probe_module("idmap", modulename);
if (NT_STATUS_IS_OK(ret)) {
idmap_alloc_ctx->methods =
get_alloc_methods(modulename);
}
}
if (idmap_alloc_ctx->methods == NULL) {
DEBUG(1, ("could not find idmap alloc module %s\n", backend));
ret = NT_STATUS_INVALID_PARAMETER;
goto fail;
}
ret = idmap_alloc_ctx->methods->init(params);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0, ("ERROR: Initialization failed for alloc "
"backend, deferred!\n"));
goto fail;
}
TALLOC_FREE(modulename);
TALLOC_FREE(params);
*ctx = idmap_alloc_ctx;
return NT_STATUS_OK;
fail:
TALLOC_FREE(idmap_alloc_ctx);
return ret;
}
/**************************************************************************
idmap allocator interface functions
**************************************************************************/
NTSTATUS idmap_allocate_uid(struct unixid *id)
{
struct idmap_alloc_context *ctx;
NTSTATUS ret;
if (!NT_STATUS_IS_OK(ret = idmap_alloc_init(&ctx))) {
return ret;
}
id->type = ID_TYPE_UID;
return ctx->methods->allocate_id(id);
}
NTSTATUS idmap_allocate_gid(struct unixid *id)
{
struct idmap_alloc_context *ctx;
NTSTATUS ret;
if (!NT_STATUS_IS_OK(ret = idmap_alloc_init(&ctx))) {
return ret;
}
id->type = ID_TYPE_GID;
return ctx->methods->allocate_id(id);
}
NTSTATUS idmap_set_uid_hwm(struct unixid *id)
{
struct idmap_alloc_context *ctx;
NTSTATUS ret;
if (!NT_STATUS_IS_OK(ret = idmap_alloc_init(&ctx))) {
return ret;
}
id->type = ID_TYPE_UID;
return ctx->methods->set_id_hwm(id);
}
NTSTATUS idmap_set_gid_hwm(struct unixid *id)
{
struct idmap_alloc_context *ctx;
NTSTATUS ret;
if (!NT_STATUS_IS_OK(ret = idmap_alloc_init(&ctx))) {
return ret;
}
id->type = ID_TYPE_GID;
return ctx->methods->set_id_hwm(id);
}
NTSTATUS idmap_new_mapping(const struct dom_sid *psid, enum id_type type,
struct unixid *pxid)
{
struct dom_sid sid;
struct idmap_domain *dom;
struct id_map map;
NTSTATUS status;
dom = idmap_find_domain(NULL);
if (dom == NULL) {
DEBUG(3, ("no default domain, no place to write\n"));
return NT_STATUS_ACCESS_DENIED;
}
if (dom->methods->set_mapping == NULL) {
DEBUG(3, ("default domain not writable\n"));
return NT_STATUS_MEDIA_WRITE_PROTECTED;
}
sid_copy(&sid, psid);
map.sid = &sid;
map.xid.type = type;
switch (type) {
case ID_TYPE_UID:
status = idmap_allocate_uid(&map.xid);
break;
case ID_TYPE_GID:
status = idmap_allocate_gid(&map.xid);
break;
default:
status = NT_STATUS_INVALID_PARAMETER;
break;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("Could not allocate id: %s\n", nt_errstr(status)));
return status;
}
map.status = ID_MAPPED;
DEBUG(10, ("Setting mapping: %s <-> %s %lu\n",
sid_string_dbg(map.sid),
(map.xid.type == ID_TYPE_UID) ? "UID" : "GID",
(unsigned long)map.xid.id));
status = dom->methods->set_mapping(dom, &map);
if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_COLLISION)) {
struct id_map *ids[2];
DEBUG(5, ("Mapping for %s exists - retrying to map sid\n",
sid_string_dbg(map.sid)));
ids[0] = ↦
ids[1] = NULL;
status = dom->methods->sids_to_unixids(dom, ids);
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("Could not store the new mapping: %s\n",
nt_errstr(status)));
return status;
}
*pxid = map.xid;
return NT_STATUS_OK;
}
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))) {
dom = idmap_init_passdb_domain(NULL);
if (dom == NULL) {
return NT_STATUS_NONE_MAPPED;
}
return dom->methods->sids_to_unixids(dom, maps);
}
dom = idmap_find_domain(domain);
if (dom == NULL) {
return NT_STATUS_NONE_MAPPED;
}
return dom->methods->sids_to_unixids(dom, maps);
}
NTSTATUS idmap_set_mapping(const struct id_map *map)
{
struct idmap_domain *dom;
dom = idmap_find_domain(NULL);
if (dom == NULL) {
DEBUG(3, ("no default domain, no place to write\n"));
return NT_STATUS_ACCESS_DENIED;
}
if (dom->methods->set_mapping == NULL) {
DEBUG(3, ("default domain not writable\n"));
return NT_STATUS_MEDIA_WRITE_PROTECTED;
}
return dom->methods->set_mapping(dom, map);
}
NTSTATUS idmap_remove_mapping(const struct id_map *map)
{
struct idmap_domain *dom;
dom = idmap_find_domain(NULL);
if (dom == NULL) {
DEBUG(3, ("no default domain, no place to write\n"));
return NT_STATUS_ACCESS_DENIED;
}
if (dom->methods->remove_mapping == NULL) {
DEBUG(3, ("default domain not writable\n"));
return NT_STATUS_MEDIA_WRITE_PROTECTED;
}
return dom->methods->remove_mapping(dom, map);
}
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