/* 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 "passdb/machine_sid.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; } /** * 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; char *config_option = NULL; const char *range; 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 */ 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); 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; char *config_option; const char *backend; idmap_init(); 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, true); if (result == NULL) { goto fail; } TALLOC_FREE(config_option); return result; fail: TALLOC_FREE(config_option); 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) { return idmap_init_named_domain(mem_ctx, "*"); } /** * 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(); /* * 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 (passdb_idmap_domain != NULL) { return passdb_idmap_domain; } passdb_idmap_domain = idmap_init_domain(NULL, get_global_sam_name(), "passdb", 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. */ 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")); idmap_init(); /* * 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.\n")); return NT_STATUS_NONE_MAPPED; } dom = idmap_find_domain(domain); if (dom == NULL) { return NT_STATUS_NONE_MAPPED; } return dom->methods->sids_to_unixids(dom, maps); }