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Diffstat (limited to 'source3/winbindd/idmap.c')
| -rw-r--r-- | source3/winbindd/idmap.c | 632 |
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; +} |