[PATCH 3/4] idmap_hash: Add the idmap/nss-info provider from
Likewise Open.
jerry at samba.org
jerry at samba.org
Tue Sep 16 16:20:28 GMT 2008
From: Gerald (Jerry) Carter <jerry at samba.org>
* Port the Likewise Open idmap/nss_info provider (renamed to
idmap_hash).
* uids & gids are generated based on a hashing algorithm that collapse
the Domain SID to a 31 bit number. The reverse mapping from the
high order 11 bits to the originat8ing sdomain SID is stored in
a has table initialized at start up.
* Includes support for "idmap_hash:name_map = <filename>" for the
name aliasing layer. The name map file consist of entries in
the form "alias = DOMAIN\name"
---
source3/Makefile.in | 8 +
source3/configure.in | 1 +
source3/winbindd/idmap_hash/idmap_hash.c | 393 ++++++++++++++++++++++++++++++
source3/winbindd/idmap_hash/idmap_hash.h | 60 +++++
source3/winbindd/idmap_hash/mapfile.c | 175 +++++++++++++
5 files changed, 637 insertions(+), 0 deletions(-)
create mode 100644 source3/winbindd/idmap_hash/idmap_hash.c
create mode 100644 source3/winbindd/idmap_hash/idmap_hash.h
create mode 100644 source3/winbindd/idmap_hash/mapfile.c
diff --git a/source3/Makefile.in b/source3/Makefile.in
index 31387c3..711c368 100644
--- a/source3/Makefile.in
+++ b/source3/Makefile.in
@@ -979,6 +979,10 @@ IDMAP_OBJ = winbindd/idmap.o winbindd/idmap_util.o @IDMAP_STATIC@
NSS_INFO_OBJ = winbindd/nss_info.o @NSS_INFO_STATIC@
+IDMAP_HASH_OBJ = \
+ winbindd/idmap_hash/idmap_hash.o \
+ winbindd/idmap_hash/mapfile.o
+
WINBINDD_OBJ1 = \
winbindd/winbindd.o \
winbindd/winbindd_user.o \
@@ -2208,6 +2212,10 @@ bin/ad. at SHLIBEXT@: $(BINARY_PREREQS) winbindd/idmap_ad.o
@echo "Building plugin $@"
@$(SHLD_MODULE) winbindd/idmap_ad.o
+bin/hash. at SHLIBEXT@: $(BINARY_PREREQS) $(IDMAP_HASH_OBJ)
+ @echo "Building plugin $@"
+ @$(SHLD_MODULE) $(IDMAP_HASH_OBJ)
+
bin/tdb2. at SHLIBEXT@: $(BINARY_PREREQS) winbindd/idmap_tdb2.o
@echo "Building plugin $@"
@$(SHLD_MODULE) winbindd/idmap_tdb2.o
diff --git a/source3/configure.in b/source3/configure.in
index 248c39a..010f615 100644
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -6042,6 +6042,7 @@ SMB_MODULE(idmap_passdb, winbindd/idmap_passdb.o, "bin/passdb.$SHLIBEXT", IDMAP)
SMB_MODULE(idmap_nss, winbindd/idmap_nss.o, "bin/nss.$SHLIBEXT", IDMAP)
SMB_MODULE(idmap_rid, winbindd/idmap_rid.o, "bin/rid.$SHLIBEXT", IDMAP)
SMB_MODULE(idmap_ad, winbindd/idmap_ad.o, "bin/ad.$SHLIBEXT", IDMAP)
+SMB_MODULE(idmap_hash, \$(IDMAP_HASH_OBJ), "bin/hash.$SHLIBEXT", IDMAP)
SMB_SUBSYSTEM(IDMAP, winbindd/idmap.o)
SMB_MODULE(nss_info_template, winbindd/nss_info_template.o, "bin/template.$SHLIBEXT", NSS_INFO)
diff --git a/source3/winbindd/idmap_hash/idmap_hash.c b/source3/winbindd/idmap_hash/idmap_hash.c
new file mode 100644
index 0000000..a050f99
--- /dev/null
+++ b/source3/winbindd/idmap_hash/idmap_hash.c
@@ -0,0 +1,393 @@
+/*
+ * idmap_hash.c
+ *
+ * Copyright (C) Gerald Carter <jerry at samba.org> 2007 - 2008
+ *
+ * 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/winbindd.h"
+#include "idmap_hash.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_IDMAP
+
+struct sid_hash_table {
+ DOM_SID *sid;
+};
+
+struct sid_hash_table *hashed_domains = NULL;
+
+/*********************************************************************
+ Hash a domain SID (S-1-5-12-aaa-bbb-ccc) to a 12bit number
+ ********************************************************************/
+
+static uint32_t hash_domain_sid(const DOM_SID *sid)
+{
+ uint32_t hash;
+
+ if (sid->num_auths != 4)
+ return 0;
+
+ /* XOR the last three subauths */
+
+ hash = ((sid->sub_auths[1] ^ sid->sub_auths[2]) ^ sid->sub_auths[3]);
+
+ /* Take all 32-bits into account when generating the 12-bit
+ hash value */
+ hash = (((hash & 0xFFF00000) >> 20)
+ + ((hash & 0x000FFF00) >> 8)
+ + (hash & 0x000000FF)) & 0x0000FFF;
+
+ /* return a 12-bit hash value */
+
+ return hash;
+}
+
+/*********************************************************************
+ Hash a Relative ID to a 20 bit number
+ ********************************************************************/
+
+static uint32_t hash_rid(uint32_t rid)
+{
+ /* 20 bits for the rid which allows us to support
+ the first 100K users/groups in a domain */
+
+ return (rid & 0x0007FFFF);
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static uint32_t combine_hashes(uint32_t h_domain,
+ uint32_t h_rid)
+{
+ uint32_t return_id = 0;
+
+ /* shift the hash_domain 19 bits to the left and OR with the
+ hash_rid */
+
+ return_id = ((h_domain<<19) | h_rid);
+
+ return return_id;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static void separate_hashes(uint32_t id,
+ uint32_t *h_domain,
+ uint32_t *h_rid)
+{
+ *h_rid = id & 0x0007FFFF;
+ *h_domain = (id & 0x7FF80000) >> 19;
+
+ return;
+}
+
+
+/*********************************************************************
+ ********************************************************************/
+
+static NTSTATUS be_init(struct idmap_domain *dom,
+ const char *params)
+{
+ NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
+ struct winbindd_tdc_domain *dom_list = NULL;
+ size_t num_domains = 0;
+ int i;
+
+ /* If the domain SID hash talbe has been initialized, assume
+ that we completed this function previously */
+
+ if ( hashed_domains ) {
+ nt_status = NT_STATUS_OK;
+ goto done;
+ }
+
+ if (!wcache_tdc_fetch_list(&dom_list, &num_domains)) {
+ nt_status = NT_STATUS_TRUSTED_DOMAIN_FAILURE;
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+ }
+
+ /* Create the hash table of domain SIDs */
+
+ hashed_domains = TALLOC_ZERO_ARRAY(NULL, struct sid_hash_table, 4096);
+ BAIL_ON_PTR_NT_ERROR(hashed_domains, nt_status);
+
+ /* create the hash table of domain SIDs */
+
+ for (i=0; i<num_domains; i++) {
+ uint32_t hash;
+
+ if (is_null_sid(&dom_list[i].sid))
+ continue;
+ if ((hash = hash_domain_sid(&dom_list[i].sid)) == 0)
+ continue;
+
+ DEBUG(5,("hash:be_init() Adding %s (%s) -> %d\n",
+ dom_list[i].domain_name,
+ sid_string_dbg(&dom_list[i].sid),
+ hash));
+
+ hashed_domains[hash].sid = talloc(hashed_domains, DOM_SID);
+ sid_copy(hashed_domains[hash].sid, &dom_list[i].sid);
+ }
+
+done:
+ return nt_status;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static NTSTATUS unixids_to_sids(struct idmap_domain *dom,
+ struct id_map **ids)
+{
+ NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
+ int i;
+
+ nt_status = be_init(dom, NULL);
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+
+ if (!ids) {
+ nt_status = NT_STATUS_INVALID_PARAMETER;
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+ }
+
+ for (i=0; ids[i]; i++) {
+ uint32_t h_domain, h_rid;
+
+ ids[i]->status = ID_UNMAPPED;
+
+ separate_hashes(ids[i]->xid.id, &h_domain, &h_rid);
+
+ /* Make sure the caller allocated memor for us */
+
+ if (!ids[i]->sid) {
+ nt_status = NT_STATUS_INVALID_PARAMETER;
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+ }
+
+ /* If the domain hash doesn't find a SID in the table,
+ skip it */
+
+ if (!hashed_domains[h_domain].sid)
+ continue;
+
+ sid_copy(ids[i]->sid, hashed_domains[h_domain].sid);
+ sid_append_rid(ids[i]->sid, h_rid);
+ ids[i]->status = ID_MAPPED;
+ }
+
+done:
+ return nt_status;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static NTSTATUS sids_to_unixids(struct idmap_domain *dom,
+ struct id_map **ids)
+{
+ NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
+ int i;
+
+ nt_status = be_init(dom, NULL);
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+
+ if (!ids) {
+ nt_status = NT_STATUS_INVALID_PARAMETER;
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+ }
+
+ for (i=0; ids[i]; i++) {
+ DOM_SID sid;
+ uint32_t rid;
+ uint32_t h_domain, h_rid;
+
+ ids[i]->status = ID_UNMAPPED;
+
+ sid_copy(&sid, ids[i]->sid);
+ sid_split_rid(&sid, &rid);
+
+ h_domain = hash_domain_sid(&sid);
+ h_rid = hash_rid(rid);
+
+ /* Check that both hashes are non-zero*/
+
+ if (h_domain && h_rid) {
+ ids[i]->xid.id = combine_hashes(h_domain, h_rid);
+ ids[i]->status = ID_MAPPED;
+ }
+ }
+
+done:
+ return nt_status;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static NTSTATUS be_close(struct idmap_domain *dom)
+{
+ if (hashed_domains)
+ talloc_free(hashed_domains);
+
+ return NT_STATUS_OK;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static NTSTATUS nss_hash_init(struct nss_domain_entry *e )
+{
+ return be_init(NULL, NULL);
+}
+
+/**********************************************************************
+ *********************************************************************/
+
+static NTSTATUS nss_hash_get_info(struct nss_domain_entry *e,
+ const DOM_SID *sid,
+ TALLOC_CTX *ctx,
+ ADS_STRUCT *ads,
+ LDAPMessage *msg,
+ char **homedir,
+ char **shell,
+ char **gecos,
+ gid_t *p_gid )
+{
+ NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
+
+ nt_status = nss_hash_init(e);
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+
+ if (!homedir || !shell || !gecos) {
+ nt_status = NT_STATUS_INVALID_PARAMETER;
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+ }
+
+ *homedir = talloc_strdup(ctx, lp_template_homedir());
+ BAIL_ON_PTR_NT_ERROR(*homedir, nt_status);
+
+ *shell = talloc_strdup(ctx, lp_template_shell());
+ BAIL_ON_PTR_NT_ERROR(*shell, nt_status);
+
+ *gecos = NULL;
+
+ /* Initialize the gid so that the upper layer fills
+ in the proper Windows primary group */
+
+ if (*p_gid) {
+ *p_gid = (gid_t)-1;
+ }
+
+done:
+ return nt_status;
+}
+
+/**********************************************************************
+ *********************************************************************/
+
+static NTSTATUS nss_hash_map_to_alias(TALLOC_CTX *mem_ctx,
+ const char *domain,
+ const char *name,
+ char **alias)
+{
+ NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
+ const char *value;
+
+ value = talloc_asprintf(mem_ctx, "%s\\%s", domain, name);
+ BAIL_ON_PTR_NT_ERROR(value, nt_status);
+
+ nt_status = mapfile_lookup_key(mem_ctx, value, alias);
+ BAIL_ON_NTSTATUS_ERROR(nt_status);
+
+done:
+ return nt_status;
+}
+
+/**********************************************************************
+ *********************************************************************/
+
+static NTSTATUS nss_hash_map_from_alias(TALLOC_CTX *mem_ctx,
+ const char *domain,
+ const char *alias,
+ char **name)
+{
+ return mapfile_lookup_value(mem_ctx, alias, name);
+}
+
+/**********************************************************************
+ *********************************************************************/
+
+static NTSTATUS nss_hash_close(void)
+{
+ return NT_STATUS_OK;
+}
+
+/*********************************************************************
+ Dispatch Tables for IDMap and NssInfo Methods
+********************************************************************/
+
+static struct idmap_methods hash_idmap_methods = {
+ .init = be_init,
+ .unixids_to_sids = unixids_to_sids,
+ .sids_to_unixids = sids_to_unixids,
+ .close_fn = be_close
+};
+
+static struct nss_info_methods hash_nss_methods = {
+ .init = nss_hash_init,
+ .get_nss_info = nss_hash_get_info,
+ .map_to_alias = nss_hash_map_to_alias,
+ .map_from_alias = nss_hash_map_from_alias,
+ .close_fn = nss_hash_close
+};
+
+/**********************************************************************
+ Register with the idmap and idmap_nss subsystems. We have to protect
+ against the idmap and nss_info interfaces being in a half-registered
+ state.
+ **********************************************************************/
+
+NTSTATUS idmap_hash_init(void)
+{
+ static NTSTATUS idmap_status = NT_STATUS_UNSUCCESSFUL;
+ static NTSTATUS nss_status = NT_STATUS_UNSUCCESSFUL;
+
+ if ( !NT_STATUS_IS_OK(idmap_status) ) {
+ idmap_status = smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
+ "hash", &hash_idmap_methods);
+
+ if ( !NT_STATUS_IS_OK(idmap_status) ) {
+ DEBUG(0,("Failed to register hash idmap plugin.\n"));
+ return idmap_status;
+ }
+ }
+
+ if ( !NT_STATUS_IS_OK(nss_status) ) {
+ nss_status = smb_register_idmap_nss(SMB_NSS_INFO_INTERFACE_VERSION,
+ "hash", &hash_nss_methods);
+ if ( !NT_STATUS_IS_OK(nss_status) ) {
+ DEBUG(0,("Failed to register hash idmap nss plugin.\n"));
+ return nss_status;
+ }
+ }
+
+ return NT_STATUS_OK;
+}
diff --git a/source3/winbindd/idmap_hash/idmap_hash.h b/source3/winbindd/idmap_hash/idmap_hash.h
new file mode 100644
index 0000000..621520e
--- /dev/null
+++ b/source3/winbindd/idmap_hash/idmap_hash.h
@@ -0,0 +1,60 @@
+/*
+ * lwopen.h
+ *
+ * Copyright (C) Gerald Carter <jerry at samba.org>
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef _LWOPEN_H
+#define _LWOPEN_H
+
+#define BAIL_ON_NTSTATUS_ERROR(x) \
+ do { \
+ if (!NT_STATUS_IS_OK(x)) { \
+ DEBUG(10,("Failed! (%s)\n", nt_errstr(x))); \
+ goto done; \
+ } \
+ } \
+ while (0); \
+
+#define BAIL_ON_PTR_NT_ERROR(p, x) \
+ do { \
+ if ((p) == NULL ) { \
+ DEBUG(10,("NULL pointer!\n")); \
+ x = NT_STATUS_NO_MEMORY; \
+ goto done; \
+ } else { \
+ x = NT_STATUS_OK; \
+ } \
+ } while (0);
+
+#define PRINT_NTSTATUS_ERROR(x, hdr, level) \
+ do { \
+ if (!NT_STATUS_IS_OK(x)) { \
+ DEBUG(level,("Likewise Open ("hdr"): %s\n", nt_errstr(x))); \
+ } \
+ } while(0);
+
+
+NTSTATUS mapfile_lookup_key(TALLOC_CTX *ctx,
+ const char *value,
+ char **key);
+
+NTSTATUS mapfile_lookup_value(TALLOC_CTX *ctx,
+ const char *key,
+ char **value);
+
+#endif /* _LWOPEN_H */
diff --git a/source3/winbindd/idmap_hash/mapfile.c b/source3/winbindd/idmap_hash/mapfile.c
new file mode 100644
index 0000000..5ab1142
--- /dev/null
+++ b/source3/winbindd/idmap_hash/mapfile.c
@@ -0,0 +1,175 @@
+/*
+ * mapfile.c
+ *
+ * Copyright (C) Gerald Carter <jerry at samba.org>
+ *
+ * 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/winbindd.h"
+#include "idmap_hash.h"
+#include <stdio.h>
+
+XFILE *lw_map_file = NULL;
+
+/*********************************************************************
+ ********************************************************************/
+
+static bool mapfile_open(void)
+{
+ const char *mapfile_name = NULL;
+
+ /* If we have an open handle, just reset it */
+
+ if (lw_map_file) {
+ return (x_tseek(lw_map_file, 0, SEEK_SET) == 0);
+ }
+
+ mapfile_name = lp_parm_const_string(-1, "idmap_hash", "name_map", NULL);
+ if (!mapfile_name) {
+ return false;
+ }
+
+ lw_map_file = x_fopen(mapfile_name, O_RDONLY, 0);
+ if (!lw_map_file) {
+ DEBUG(0,("can't open idmap_hash:name_map (%s). Error %s\n",
+ mapfile_name, strerror(errno) ));
+ return false;
+ }
+
+ return true;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static bool mapfile_read_line(fstring key, fstring value)
+{
+ char buffer[1024];
+ char *p;
+ int len;
+
+ if (!lw_map_file)
+ return false;
+
+ if ((p = x_fgets(buffer, sizeof(buffer)-1, lw_map_file)) == NULL) {
+ return false;
+ }
+
+ /* Strip newlines and carriage returns */
+
+ len = strlen_m(buffer) - 1;
+ while ((buffer[len] == '\n') || (buffer[len] == '\r')) {
+ buffer[len--] = '\0';
+ }
+
+
+ if ((p = strchr_m(buffer, '=')) == NULL ) {
+ DEBUG(0,("idmap_hash: Bad line in name_map (%s)\n", buffer));
+ return false;
+ }
+
+ *p = '\0';
+ p++;
+
+ fstrcpy(key, buffer);
+ fstrcpy(value, p);
+
+ /* Eat whitespace */
+
+ if (!trim_char(key, ' ', ' '))
+ return false;
+
+ if (!trim_char(value, ' ', ' '))
+ return false;
+
+ return true;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static bool mapfile_close(void)
+{
+ int ret = 0;
+ if (lw_map_file) {
+ ret = x_fclose(lw_map_file);
+ lw_map_file = NULL;
+ }
+
+ return (ret == 0);
+}
+
+
+/*********************************************************************
+ ********************************************************************/
+
+NTSTATUS mapfile_lookup_key(TALLOC_CTX *ctx, const char *value, char **key)
+{
+ fstring r_key, r_value;
+ NTSTATUS ret = NT_STATUS_NOT_FOUND;
+
+ if (!mapfile_open())
+ return NT_STATUS_OBJECT_PATH_NOT_FOUND;
+
+ while (mapfile_read_line(r_key, r_value))
+ {
+ if (strequal(r_value, value)) {
+ ret = NT_STATUS_OK;
+
+ /* We're done once finishing this block */
+ *key = talloc_strdup(ctx, r_key);
+ if (!*key) {
+ ret = NT_STATUS_NO_MEMORY;
+ }
+ break;
+ }
+ }
+
+ mapfile_close();
+
+ return ret;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+NTSTATUS mapfile_lookup_value(TALLOC_CTX *ctx, const char *key, char **value)
+{
+ fstring r_key, r_value;
+ NTSTATUS ret = NT_STATUS_NOT_FOUND;
+
+ if (!mapfile_open())
+ return NT_STATUS_OBJECT_PATH_NOT_FOUND;
+
+ while (mapfile_read_line(r_key, r_value))
+ {
+ if (strequal(r_key, key)) {
+ ret = NT_STATUS_OK;
+
+ /* We're done once finishing this block */
+ *value = talloc_strdup(ctx, r_value);
+ if (!*key) {
+ ret = NT_STATUS_NO_MEMORY;
+ }
+ break;
+ }
+ }
+
+ mapfile_close();
+
+ return ret;
+}
--
1.5.4.3
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