r14964: - move sidmap code from ntvfs_common to SAMDB

- make ntvfs_common a library
- create sys_notify library

metze
(This used to be commit a3e1d56cf7b688c515f5d6d4d43e0b24c2261d15)

2 files changed, 567 insertions, 0 deletions

diff --git a/source4/dsdb/common/sidmap.c b/source4/dsdb/common/sidmap.c
new file mode 100644
index 0000000000..ee314cddec
--- /dev/null
+++ b/source4/dsdb/common/sidmap.c
@@ -0,0 +1,566 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   mapping routines for SID <-> unix uid/gid
+
+   Copyright (C) Andrew Tridgell 2004
+   
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "system/passwd.h"
+#include "ads.h"
+#include "dsdb/samdb/samdb.h"
+#include "auth/auth.h"
+#include "libcli/ldap/ldap.h"
+#include "db_wrap.h"
+#include "libcli/security/security.h"
+#include "librpc/gen_ndr/ndr_security.h"
+
+/*
+  these are used for the fallback local uid/gid to sid mapping
+  code.
+*/
+#define SIDMAP_LOCAL_USER_BASE  0x80000000
+#define SIDMAP_LOCAL_GROUP_BASE 0xC0000000
+#define SIDMAP_MAX_LOCAL_UID    0x3fffffff
+#define SIDMAP_MAX_LOCAL_GID    0x3fffffff
+
+/*
+  private context for sid mapping routines
+*/
+struct sidmap_context {
+	struct ldb_wrap *samctx;
+};
+
+/*
+  open a sidmap context - use talloc_free to close
+*/
+_PUBLIC_ struct sidmap_context *sidmap_open(TALLOC_CTX *mem_ctx)
+{
+	struct sidmap_context *sidmap;
+	sidmap = talloc(mem_ctx, struct sidmap_context);
+	if (sidmap == NULL) {
+		return NULL;
+	}
+	sidmap->samctx = samdb_connect(sidmap, system_session(sidmap));
+	if (sidmap->samctx == NULL) {
+		talloc_free(sidmap);
+		return NULL;
+	}
+
+	return sidmap;
+}
+
+
+/*
+  check the sAMAccountType field of a search result to see if
+  the account is a user account
+*/
+static BOOL is_user_account(struct ldb_message *res)
+{
+	uint_t atype = samdb_result_uint(res, "sAMAccountType", 0);
+	if (atype && (!(atype & ATYPE_ACCOUNT))) {
+		return False;
+	}
+	return True;
+}
+
+/*
+  check the sAMAccountType field of a search result to see if
+  the account is a group account
+*/
+static BOOL is_group_account(struct ldb_message *res)
+{
+	uint_t atype = samdb_result_uint(res, "sAMAccountType", 0);
+	if (atype && atype == ATYPE_NORMAL_ACCOUNT) {
+		return False;
+	}
+	return True;
+}
+
+
+
+/*
+  return the dom_sid of our primary domain
+*/
+static NTSTATUS sidmap_primary_domain_sid(struct sidmap_context *sidmap, 
+					  TALLOC_CTX *mem_ctx, struct dom_sid **sid)
+{
+	const char *attrs[] = { "objectSid", NULL };
+	int ret;
+	struct ldb_message **res = NULL;
+
+	ret = gendb_search_dn(sidmap->samctx, mem_ctx, samdb_base_dn(mem_ctx), 
+			      &res, attrs);
+	if (ret != 1) {
+		talloc_free(res);
+		return NT_STATUS_NO_SUCH_DOMAIN;
+	}
+	
+	*sid = samdb_result_dom_sid(mem_ctx, res[0], "objectSid");
+	talloc_free(res);
+	if (*sid == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	return NT_STATUS_OK;
+}
+
+
+/*
+  map a sid to a unix uid
+*/
+_PUBLIC_ NTSTATUS sidmap_sid_to_unixuid(struct sidmap_context *sidmap, 
+					struct dom_sid *sid, uid_t *uid)
+{
+	const char *attrs[] = { "sAMAccountName", "unixID", 
+				"unixName", "sAMAccountType", NULL };
+	int ret;
+	const char *s;
+	TALLOC_CTX *tmp_ctx;
+	struct ldb_message **res;
+	struct dom_sid *domain_sid;
+	NTSTATUS status;
+
+	tmp_ctx = talloc_new(sidmap);
+
+	ret = gendb_search(sidmap->samctx, tmp_ctx, NULL, &res, attrs, 
+			   "objectSid=%s", ldap_encode_ndr_dom_sid(tmp_ctx, sid));
+	if (ret != 1) {
+		goto allocated_sid;
+	}
+
+	/* make sure its a user, not a group */
+	if (!is_user_account(res[0])) {
+		DEBUG(0,("sid_to_unixuid: sid %s is not an account!\n", 
+			 dom_sid_string(tmp_ctx, sid)));
+		talloc_free(tmp_ctx);
+		return NT_STATUS_INVALID_SID;
+	}
+
+	/* first try to get the uid directly */
+	s = samdb_result_string(res[0], "unixID", NULL);
+	if (s != NULL) {
+		*uid = strtoul(s, NULL, 0);
+		talloc_free(tmp_ctx);
+		return NT_STATUS_OK;
+	}
+
+	/* next try via the UnixName attribute */
+	s = samdb_result_string(res[0], "unixName", NULL);
+	if (s != NULL) {
+		struct passwd *pwd = getpwnam(s);
+		if (!pwd) {
+			DEBUG(0,("unixName %s for sid %s does not exist as a local user\n", s, 
+				 dom_sid_string(tmp_ctx, sid)));
+			talloc_free(tmp_ctx);
+			return NT_STATUS_NO_SUCH_USER;
+		}
+		*uid = pwd->pw_uid;
+		talloc_free(tmp_ctx);
+		return NT_STATUS_OK;
+	}
+
+	/* finally try via the sAMAccountName attribute */
+	s = samdb_result_string(res[0], "sAMAccountName", NULL);
+	if (s != NULL) {
+		struct passwd *pwd = getpwnam(s);
+		if (!pwd) {
+			DEBUG(0,("sAMAccountName '%s' for sid %s does not exist as a local user\n", 
+				 s, dom_sid_string(tmp_ctx, sid)));
+			talloc_free(tmp_ctx);
+			return NT_STATUS_NO_SUCH_USER;
+		}
+		*uid = pwd->pw_uid;
+		talloc_free(tmp_ctx);
+		return NT_STATUS_OK;
+	}
+
+
+allocated_sid:
+	status = sidmap_primary_domain_sid(sidmap, tmp_ctx, &domain_sid);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		return NT_STATUS_NO_SUCH_DOMAIN;
+	}
+
+	if (dom_sid_in_domain(domain_sid, sid)) {
+		uint32_t rid = sid->sub_auths[sid->num_auths-1];
+		if (rid >= SIDMAP_LOCAL_USER_BASE && 
+		    rid <  SIDMAP_LOCAL_GROUP_BASE) {
+			*uid = rid - SIDMAP_LOCAL_USER_BASE;
+			talloc_free(tmp_ctx);
+			return NT_STATUS_OK;
+		}
+	}
+	
+
+	DEBUG(0,("sid_to_unixuid: no unixID, unixName or sAMAccountName for sid %s\n", 
+		 dom_sid_string(tmp_ctx, sid)));
+
+	talloc_free(tmp_ctx);
+	return NT_STATUS_INVALID_SID;
+}
+
+
+/*
+  map a sid to a unix gid
+*/
+_PUBLIC_ NTSTATUS sidmap_sid_to_unixgid(struct sidmap_context *sidmap,
+					struct dom_sid *sid, gid_t *gid)
+{
+	const char *attrs[] = { "sAMAccountName", "unixID", 
+				"unixName", "sAMAccountType", NULL };
+	int ret;
+	const char *s;
+	TALLOC_CTX *tmp_ctx;
+	struct ldb_message **res;
+	NTSTATUS status;
+	struct dom_sid *domain_sid;
+
+	tmp_ctx = talloc_new(sidmap);
+
+	ret = gendb_search(sidmap->samctx, tmp_ctx, NULL, &res, attrs, 
+			   "objectSid=%s", ldap_encode_ndr_dom_sid(tmp_ctx, sid));
+	if (ret != 1) {
+		goto allocated_sid;
+	}
+
+	/* make sure its not a user */
+	if (!is_group_account(res[0])) {
+		DEBUG(0,("sid_to_unixgid: sid %s is a ATYPE_NORMAL_ACCOUNT\n", 
+			 dom_sid_string(tmp_ctx, sid)));
+		talloc_free(tmp_ctx);
+		return NT_STATUS_INVALID_SID;
+	}
+
+	/* first try to get the gid directly */
+	s = samdb_result_string(res[0], "unixID", NULL);
+	if (s != NULL) {
+		*gid = strtoul(s, NULL, 0);
+		talloc_free(tmp_ctx);
+		return NT_STATUS_OK;
+	}
+
+	/* next try via the UnixName attribute */
+	s = samdb_result_string(res[0], "unixName", NULL);
+	if (s != NULL) {
+		struct group *grp = getgrnam(s);
+		if (!grp) {
+			DEBUG(0,("unixName '%s' for sid %s does not exist as a local group\n", 
+				 s, dom_sid_string(tmp_ctx, sid)));
+			talloc_free(tmp_ctx);
+			return NT_STATUS_NO_SUCH_USER;
+		}
+		*gid = grp->gr_gid;
+		talloc_free(tmp_ctx);
+		return NT_STATUS_OK;
+	}
+
+	/* finally try via the sAMAccountName attribute */
+	s = samdb_result_string(res[0], "sAMAccountName", NULL);
+	if (s != NULL) {
+		struct group *grp = getgrnam(s);
+		if (!grp) {
+			DEBUG(0,("sAMAccountName '%s' for sid %s does not exist as a local group\n", s, dom_sid_string(tmp_ctx, sid)));
+			talloc_free(tmp_ctx);
+			return NT_STATUS_NO_SUCH_USER;
+		}
+		*gid = grp->gr_gid;
+		talloc_free(tmp_ctx);
+		return NT_STATUS_OK;
+	}
+
+allocated_sid:
+	status = sidmap_primary_domain_sid(sidmap, tmp_ctx, &domain_sid);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		return NT_STATUS_NO_SUCH_DOMAIN;
+	}
+
+	if (dom_sid_in_domain(domain_sid, sid)) {
+		uint32_t rid = sid->sub_auths[sid->num_auths-1];
+		if (rid >= SIDMAP_LOCAL_GROUP_BASE) {
+			*gid = rid - SIDMAP_LOCAL_GROUP_BASE;
+			talloc_free(tmp_ctx);
+			return NT_STATUS_OK;
+		}
+	}
+
+	DEBUG(0,("sid_to_unixgid: no unixID, unixName or sAMAccountName for sid %s\n", 
+		 dom_sid_string(tmp_ctx, sid)));
+
+	talloc_free(tmp_ctx);
+	return NT_STATUS_INVALID_SID;
+}
+
+
+/*
+  map a unix uid to a dom_sid
+  the returned sid is allocated in the supplied mem_ctx
+*/
+_PUBLIC_ NTSTATUS sidmap_uid_to_sid(struct sidmap_context *sidmap,
+				    TALLOC_CTX *mem_ctx,
+				    uid_t uid, struct dom_sid **sid)
+{
+	const char *attrs[] = { "sAMAccountName", "objectSid", "sAMAccountType", NULL };
+	int ret, i;
+	TALLOC_CTX *tmp_ctx;
+	struct ldb_message **res;
+	struct passwd *pwd;
+	struct dom_sid *domain_sid;
+	NTSTATUS status;
+
+	/*
+	  we search for the mapping in the following order:
+
+	    - check if the uid is in the dynamic uid range assigned for winbindd
+	      use. If it is, then look in winbindd sid mapping
+	      database (not implemented yet)
+	    - look for a user account in samdb that has unixID set to the
+	      given uid
+	    - look for a user account in samdb that has unixName or
+	      sAMAccountName set to the name given by getpwuid()
+	    - assign a SID by adding the uid to SIDMAP_LOCAL_USER_BASE in the local
+	      domain
+	*/
+
+
+	tmp_ctx = talloc_new(mem_ctx);
+
+
+	/*
+	  step 2: look for a user account in samdb that has unixID set to the
+                  given uid
+	*/
+
+	ret = gendb_search(sidmap->samctx, tmp_ctx, NULL, &res, attrs, 
+			   "unixID=%u", (unsigned int)uid);
+	for (i=0;i<ret;i++) {
+		if (!is_user_account(res[i])) continue;
+
+		*sid = samdb_result_dom_sid(mem_ctx, res[i], "objectSid");
+		talloc_free(tmp_ctx);
+		NT_STATUS_HAVE_NO_MEMORY(*sid);
+		return NT_STATUS_OK;
+	}
+
+	/*
+	  step 3: look for a user account in samdb that has unixName
+	          or sAMAccountName set to the name given by getpwuid()
+	*/
+	pwd = getpwuid(uid);
+	if (pwd == NULL) {
+		goto allocate_sid;
+	}
+
+	ret = gendb_search(sidmap->samctx, tmp_ctx, NULL, &res, attrs, 
+			   "(|(unixName=%s)(sAMAccountName=%s))", 
+			   pwd->pw_name, pwd->pw_name);
+	for (i=0;i<ret;i++) {
+		if (!is_user_account(res[i])) continue;
+
+		*sid = samdb_result_dom_sid(mem_ctx, res[i], "objectSid");
+		talloc_free(tmp_ctx);
+		NT_STATUS_HAVE_NO_MEMORY(*sid);
+		return NT_STATUS_OK;
+	}
+
+
+	/*
+	    step 4: assign a SID by adding the uid to
+	            SIDMAP_LOCAL_USER_BASE in the local domain
+	*/
+allocate_sid:
+	if (uid > SIDMAP_MAX_LOCAL_UID) {
+		return NT_STATUS_INVALID_SID;
+	}
+
+	status = sidmap_primary_domain_sid(sidmap, tmp_ctx, &domain_sid);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		return status;
+	}
+
+	*sid = dom_sid_add_rid(mem_ctx, domain_sid, SIDMAP_LOCAL_USER_BASE + uid);
+	talloc_free(tmp_ctx);
+
+	if (*sid == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	return NT_STATUS_OK;
+}
+
+
+/*
+  map a unix gid to a dom_sid
+  the returned sid is allocated in the supplied mem_ctx
+*/
+_PUBLIC_ NTSTATUS sidmap_gid_to_sid(struct sidmap_context *sidmap,
+				    TALLOC_CTX *mem_ctx,
+				    gid_t gid, struct dom_sid **sid)
+{
+	const char *attrs[] = { "sAMAccountName", "objectSid", "sAMAccountType", NULL };
+	int ret, i;
+	TALLOC_CTX *tmp_ctx;
+	struct ldb_message **res;
+	struct group *grp;
+	struct dom_sid *domain_sid;
+	NTSTATUS status;
+
+	/*
+	  we search for the mapping in the following order:
+
+	    - check if the gid is in the dynamic gid range assigned for winbindd
+	      use. If it is, then look in winbindd sid mapping
+	      database (not implemented yet)
+	    - look for a group account in samdb that has unixID set to the
+	      given gid
+	    - look for a group account in samdb that has unixName or
+	      sAMAccountName set to the name given by getgrgid()
+	    - assign a SID by adding the gid to SIDMAP_LOCAL_GROUP_BASE in the local
+	      domain
+	*/
+
+
+	tmp_ctx = talloc_new(sidmap);
+
+
+	/*
+	  step 2: look for a group account in samdb that has unixID set to the
+                  given gid
+	*/
+
+	ret = gendb_search(sidmap->samctx, tmp_ctx, NULL, &res, attrs, 
+			   "unixID=%u", (unsigned int)gid);
+	for (i=0;i<ret;i++) {
+		if (!is_group_account(res[i])) continue;
+
+		*sid = samdb_result_dom_sid(mem_ctx, res[i], "objectSid");
+		talloc_free(tmp_ctx);
+		NT_STATUS_HAVE_NO_MEMORY(*sid);
+		return NT_STATUS_OK;
+	}
+
+	/*
+	  step 3: look for a group account in samdb that has unixName
+	          or sAMAccountName set to the name given by getgrgid()
+	*/
+	grp = getgrgid(gid);
+	if (grp == NULL) {
+		goto allocate_sid;
+	}
+
+	ret = gendb_search(sidmap->samctx, tmp_ctx, NULL, &res, attrs, 
+			   "(|(unixName=%s)(sAMAccountName=%s))", 
+			   grp->gr_name, grp->gr_name);
+	for (i=0;i<ret;i++) {
+		if (!is_group_account(res[i])) continue;
+
+		*sid = samdb_result_dom_sid(mem_ctx, res[i], "objectSid");
+		talloc_free(tmp_ctx);
+		NT_STATUS_HAVE_NO_MEMORY(*sid);
+		return NT_STATUS_OK;
+	}
+
+
+	/*
+	    step 4: assign a SID by adding the gid to
+	            SIDMAP_LOCAL_GROUP_BASE in the local domain
+	*/
+allocate_sid:
+	if (gid > SIDMAP_MAX_LOCAL_GID) {
+		return NT_STATUS_INVALID_SID;
+	}
+
+	status = sidmap_primary_domain_sid(sidmap, tmp_ctx, &domain_sid);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		return status;
+	}
+
+	*sid = dom_sid_add_rid(mem_ctx, domain_sid, SIDMAP_LOCAL_GROUP_BASE + gid);
+	talloc_free(tmp_ctx);
+
+	if (*sid == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	return NT_STATUS_OK;
+}
+
+/*
+  check if a sid is in the range of auto-allocated SIDs from our primary domain,
+  and if it is, then return the name and atype
+*/
+_PUBLIC_ NTSTATUS sidmap_allocated_sid_lookup(struct sidmap_context *sidmap, 
+					      TALLOC_CTX *mem_ctx, 
+					      const struct dom_sid *sid,
+					      const char **name,
+					      uint32_t *atype)
+{
+	NTSTATUS status;
+	struct dom_sid *domain_sid;
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+	uint32_t rid;
+
+	status = sidmap_primary_domain_sid(sidmap, tmp_ctx, &domain_sid);
+	if (!NT_STATUS_IS_OK(status)) {
+		return NT_STATUS_NO_SUCH_DOMAIN;
+	}
+
+	if (!dom_sid_in_domain(domain_sid, sid)) {
+		talloc_free(tmp_ctx);
+		return NT_STATUS_INVALID_SID;
+	}
+
+	talloc_free(tmp_ctx);
+
+	rid = sid->sub_auths[sid->num_auths-1];
+	if (rid < SIDMAP_LOCAL_USER_BASE) {
+		return NT_STATUS_INVALID_SID;
+	}
+
+	if (rid < SIDMAP_LOCAL_GROUP_BASE) {
+		struct passwd *pwd;
+		uid_t uid = rid - SIDMAP_LOCAL_USER_BASE;
+		*atype = ATYPE_NORMAL_ACCOUNT;
+		pwd = getpwuid(uid);
+		if (pwd == NULL) {
+			*name = talloc_asprintf(mem_ctx, "uid%u", uid);
+		} else {
+			*name = talloc_strdup(mem_ctx, pwd->pw_name);
+		}
+	} else {
+		struct group *grp;
+		gid_t gid = rid - SIDMAP_LOCAL_GROUP_BASE;
+		*atype = ATYPE_LOCAL_GROUP;
+		grp = getgrgid(gid);
+		if (grp == NULL) {
+			*name = talloc_asprintf(mem_ctx, "gid%u", gid);
+		} else {
+			*name = talloc_strdup(mem_ctx, grp->gr_name);
+		}
+	}
+
+	if (*name == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	return NT_STATUS_OK;
+}
diff --git a/source4/dsdb/config.mk b/source4/dsdb/config.mk
index b0ab2cda62..7537e53300 100644
--- a/source4/dsdb/config.mk
+++ b/source4/dsdb/config.mk
@@ -12,6 +12,7 @@ OBJ_FILES = \
 		samdb/samdb.o \
 		samdb/samdb_privilege.o \
 		samdb/cracknames.o \
+		common/sidmap.o \
 		common/flag_mapping.o
 #
 # End SUBSYSTEM SAMDB