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-rw-r--r--source4/lib/policy/gp_ldap.c568
1 files changed, 568 insertions, 0 deletions
diff --git a/source4/lib/policy/gp_ldap.c b/source4/lib/policy/gp_ldap.c
new file mode 100644
index 0000000000..ee3da9d239
--- /dev/null
+++ b/source4/lib/policy/gp_ldap.c
@@ -0,0 +1,568 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * Group Policy Object Support
+ * Copyright (C) Jelmer Vernooij 2008
+ * Copyright (C) Wilco Baan Hofman 2008-2010
+ *
+ * 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 "param/param.h"
+#include "lib/ldb/include/ldb.h"
+#include "lib/ldb_wrap.h"
+#include "auth/credentials/credentials.h"
+#include "../librpc/gen_ndr/nbt.h"
+#include "libcli/libcli.h"
+#include "libnet/libnet.h"
+#include "../librpc/gen_ndr/ndr_security.h"
+#include "../libcli/security/dom_sid.h"
+#include "libcli/security/security.h"
+#include "../lib/talloc/talloc.h"
+#include "policy.h"
+
+struct gpo_stringmap {
+ const char *str;
+ uint32_t flags;
+};
+static const struct gpo_stringmap gplink_options [] = {
+ { "GPLINK_OPT_DISABLE", GPLINK_OPT_DISABLE },
+ { "GPLINK_OPT_ENFORCE", GPLINK_OPT_ENFORCE },
+ { NULL, 0 }
+};
+static const struct gpo_stringmap gpo_flags [] = {
+ { "GPO_FLAG_USER_DISABLE", GPO_FLAG_USER_DISABLE },
+ { "GPO_FLAG_MACHINE_DISABLE", GPO_FLAG_MACHINE_DISABLE },
+ { NULL, 0 }
+};
+static const struct gpo_stringmap gpo_inheritance [] = {
+ { "GPO_INHERIT", GPO_INHERIT },
+ { "GPO_BLOCK_INHERITANCE", GPO_BLOCK_INHERITANCE },
+ { NULL, 0 }
+};
+
+static NTSTATUS parse_gpo(TALLOC_CTX *mem_ctx, struct ldb_message *msg, struct gp_object **ret)
+{
+ unsigned int i;
+ struct gp_object *gpo = talloc(mem_ctx, struct gp_object);
+ enum ndr_err_code ndr_err;
+
+ gpo->dn = talloc_steal(mem_ctx, ldb_dn_get_linearized(msg->dn));
+
+ DEBUG(9, ("Parsing GPO LDAP data for %s\n", gpo->dn));
+ for (i = 0; i < msg->num_elements; i++) {
+ struct ldb_message_element *element = &msg->elements[i];
+
+ if (strcmp(element->name, "displayName") == 0) {
+ SMB_ASSERT(element->num_values > 0);
+ gpo->display_name = talloc_strdup(gpo, (char *)element->values[0].data);
+ DEBUG(10, ("Found displayname: %s\n", gpo->display_name));
+ }
+ if (strcmp(element->name, "name") == 0) {
+ SMB_ASSERT(element->num_values > 0);
+ gpo->name = talloc_strdup(gpo, (char *)element->values[0].data);
+ DEBUG(10, ("Found name: %s\n", gpo->name));
+ }
+ if (strcmp(element->name, "flags") == 0) {
+ char *end;
+ SMB_ASSERT(element->num_values > 0);
+ gpo->flags = (uint32_t) strtoll((char *)element->values[0].data, &end, 0);
+ SMB_ASSERT(*end == 0);
+ DEBUG(10, ("Found flags: %d\n", gpo->flags));
+ }
+ if (strcmp(element->name, "versionNumber") == 0) {
+ char *end;
+ SMB_ASSERT(element->num_values > 0);
+ gpo->version = (uint32_t) strtoll((char *)element->values[0].data, &end, 0);
+ SMB_ASSERT(*end == 0);
+ DEBUG(10, ("Found version: %d\n", gpo->version));
+ }
+ if (strcmp(element->name, "gPCFileSysPath") == 0) {
+ SMB_ASSERT(element->num_values > 0);
+ gpo->file_sys_path = talloc_strdup(gpo, (char *)element->values[0].data);
+ DEBUG(10, ("Found file system path: %s\n", gpo->file_sys_path));
+ }
+ if (strcmp(element->name, "nTSecurityDescriptor") == 0) {
+ gpo->security_descriptor = talloc(mem_ctx, struct security_descriptor);
+ ndr_err = ndr_pull_struct_blob(&element->values[0],
+ mem_ctx,
+ NULL,
+ gpo->security_descriptor,
+ (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ return ndr_map_error2ntstatus(ndr_err);
+ }
+ DEBUG(10, ("Found security descriptor.\n"));
+ }
+ }
+
+ *ret = gpo;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS gp_get_gpo_flags(TALLOC_CTX *mem_ctx, uint32_t flags, const char ***ret)
+{
+ unsigned int i, count=0;
+ const char **flag_strs = talloc_array(mem_ctx, const char *, 1);
+
+ flag_strs[0] = NULL;
+
+ for (i = 0; gpo_flags[i].str != NULL; i++) {
+ if (flags & gpo_flags[i].flags) {
+ flag_strs = talloc_realloc(mem_ctx, flag_strs, const char *, count+2);
+ flag_strs[count] = gpo_flags[i].str;
+ flag_strs[count+1] = NULL;
+ count++;
+ }
+ }
+ *ret = flag_strs;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS gp_get_gplink_options(TALLOC_CTX *mem_ctx, uint32_t options, const char ***ret)
+{
+ unsigned int i, count=0;
+ const char **flag_strs = talloc_array(mem_ctx, const char *, 1);
+
+ flag_strs[0] = NULL;
+
+ for (i = 0; gplink_options[i].str != NULL; i++) {
+ if (options & gplink_options[i].flags) {
+ flag_strs = talloc_realloc(mem_ctx, flag_strs, const char *, count+2);
+ flag_strs[count] = gplink_options[i].str;
+ flag_strs[count+1] = NULL;
+ count++;
+ }
+ }
+ *ret = flag_strs;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS gp_init(TALLOC_CTX *mem_ctx,
+ struct loadparm_context *lp_ctx,
+ struct cli_credentials *credentials,
+ struct tevent_context *ev_ctx,
+ struct gp_context **gp_ctx)
+{
+
+ struct libnet_LookupDCs *io;
+ char *url;
+ struct libnet_context *net_ctx;
+ struct ldb_context *ldb_ctx;
+ NTSTATUS rv;
+
+ /* Initialise the libnet context */
+ net_ctx = libnet_context_init(ev_ctx, lp_ctx);
+ net_ctx->cred = credentials;
+
+ /* Prepare libnet lookup structure for looking a DC (PDC is correct). */
+ io = talloc_zero(mem_ctx, struct libnet_LookupDCs);
+ io->in.name_type = NBT_NAME_PDC;
+ io->in.domain_name = lp_workgroup(lp_ctx);
+
+ /* Find Active DC's */
+ rv = libnet_LookupDCs(net_ctx, mem_ctx, io);
+ if (!NT_STATUS_IS_OK(rv)) {
+ DEBUG(0, ("Failed to lookup DCs in domain\n"));
+ return rv;
+ }
+
+ /* Connect to ldap://DC_NAME with all relevant contexts*/
+ url = talloc_asprintf(mem_ctx, "ldap://%s", io->out.dcs[0].name);
+ ldb_ctx = ldb_wrap_connect(mem_ctx, net_ctx->event_ctx, lp_ctx,
+ url, NULL, net_ctx->cred, 0);
+ if (ldb_ctx == NULL) {
+ DEBUG(0, ("Can't connect to DC's LDAP with url %s\n", url));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ /* We don't need to keep the libnet context */
+ talloc_free(net_ctx);
+
+ *gp_ctx = talloc_zero(mem_ctx, struct gp_context);
+ (*gp_ctx)->lp_ctx = lp_ctx;
+ (*gp_ctx)->credentials = credentials;
+ (*gp_ctx)->ev_ctx = ev_ctx;
+ (*gp_ctx)->ldb_ctx = ldb_ctx;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS gp_list_all_gpos(struct gp_context *gp_ctx, struct gp_object ***ret)
+{
+ struct ldb_result *result;
+ int rv;
+ NTSTATUS status;
+ TALLOC_CTX *mem_ctx;
+ struct ldb_dn *dn;
+ struct gp_object **gpo;
+ unsigned int i; /* same as in struct ldb_result */
+ const char **attrs;
+
+ /* Create a forked memory context, as a base for everything here */
+ mem_ctx = talloc_new(gp_ctx);
+
+ /* Create full ldb dn of the policies base object */
+ dn = ldb_get_default_basedn(gp_ctx->ldb_ctx);
+ rv = ldb_dn_add_child(dn, ldb_dn_new(mem_ctx, gp_ctx->ldb_ctx, "CN=Policies,CN=System"));
+ if (!rv) {
+ DEBUG(0, ("Can't append subtree to DN\n"));
+ talloc_free(mem_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ DEBUG(10, ("Searching for policies in DN: %s\n", ldb_dn_get_linearized(dn)));
+
+ attrs = talloc_array(mem_ctx, const char *, 7);
+ attrs[0] = "nTSecurityDescriptor";
+ attrs[1] = "versionNumber";
+ attrs[2] = "flags";
+ attrs[3] = "name";
+ attrs[4] = "displayName";
+ attrs[5] = "gPCFileSysPath";
+ attrs[6] = NULL;
+
+ rv = ldb_search(gp_ctx->ldb_ctx, mem_ctx, &result, dn, LDB_SCOPE_ONELEVEL, attrs, "(objectClass=groupPolicyContainer)");
+ if (rv != LDB_SUCCESS) {
+ DEBUG(0, ("LDB search failed: %s\n%s\n", ldb_strerror(rv),ldb_errstring(gp_ctx->ldb_ctx)));
+ talloc_free(mem_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ gpo = talloc_array(gp_ctx, struct gp_object *, result->count+1);
+ gpo[result->count] = NULL;
+
+ for (i = 0; i < result->count; i++) {
+ status = parse_gpo(gp_ctx, result->msgs[i], &gpo[i]);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to parse GPO.\n"));
+ talloc_free(mem_ctx);
+ return status;
+ }
+ }
+
+ talloc_free(mem_ctx);
+
+ *ret = gpo;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS gp_get_gpo_info(struct gp_context *gp_ctx, const char *dn_str, struct gp_object **ret)
+{
+ struct ldb_result *result;
+ struct ldb_dn *dn;
+ struct gp_object *gpo;
+ int rv;
+ NTSTATUS status;
+ TALLOC_CTX *mem_ctx;
+ const char **attrs;
+
+ /* Create a forked memory context, as a base for everything here */
+ mem_ctx = talloc_new(gp_ctx);
+
+ /* Create an ldb dn struct for the dn string */
+ dn = ldb_dn_new(mem_ctx, gp_ctx->ldb_ctx, dn_str);
+
+ attrs = talloc_array(mem_ctx, const char *, 7);
+ attrs[0] = "nTSecurityDescriptor";
+ attrs[1] = "versionNumber";
+ attrs[2] = "flags";
+ attrs[3] = "name";
+ attrs[4] = "displayName";
+ attrs[5] = "gPCFileSysPath";
+ attrs[6] = NULL;
+
+ rv = ldb_search(gp_ctx->ldb_ctx,
+ mem_ctx,
+ &result,
+ dn,
+ LDB_SCOPE_BASE,
+ attrs,
+ "objectClass=groupPolicyContainer");
+ if (rv != LDB_SUCCESS) {
+ DEBUG(0, ("LDB search failed: %s\n%s\n", ldb_strerror(rv),ldb_errstring(gp_ctx->ldb_ctx)));
+ talloc_free(mem_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ /* We expect exactly one record */
+ if (result->count != 1) {
+ DEBUG(0, ("Could not find GPC with dn %s\n", dn_str));
+ talloc_free(mem_ctx);
+ return NT_STATUS_NOT_FOUND;
+ }
+
+ status = parse_gpo(gp_ctx, result->msgs[0], &gpo);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to parse GPO.\n"));
+ talloc_free(mem_ctx);
+ return status;
+ }
+
+ talloc_free(mem_ctx);
+
+ *ret = gpo;
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS parse_gplink (TALLOC_CTX *mem_ctx, const char *gplink_str, struct gp_link ***ret)
+{
+ int start, idx=0;
+ int pos;
+ struct gp_link **gplinks;
+ char *buf, *end;
+
+ gplinks = talloc_array(mem_ctx, struct gp_link *, 1);
+ gplinks[0] = NULL;
+
+ /* Assuming every gPLink starts with "[LDAP://" */
+ start = 8;
+
+ for (pos = start; pos < strlen(gplink_str); pos++) {
+ if (gplink_str[pos] == ';') {
+ gplinks = talloc_realloc(mem_ctx, gplinks, struct gp_link *, idx+2);
+ gplinks[idx] = talloc(mem_ctx, struct gp_link);
+ gplinks[idx]->dn = talloc_strndup(mem_ctx,
+ gplink_str + start,
+ pos - start);
+
+ for (start = pos + 1; gplink_str[pos] != ']'; pos++);
+
+ buf = talloc_strndup(gplinks, gplink_str + start, pos - start);
+ gplinks[idx]->options = (uint32_t) strtoll(buf, &end, 0);
+ talloc_free(buf);
+
+ /* Set the last entry in the array to be NULL */
+ gplinks[idx + 1] = NULL;
+
+ /* Increment the array index, the string position past
+ the next "[LDAP://", and set the start reference */
+ idx++;
+ pos += 9;
+ start = pos;
+ }
+ }
+
+ *ret = gplinks;
+ return NT_STATUS_OK;
+}
+
+
+NTSTATUS gp_get_gplinks(struct gp_context *gp_ctx, const char *req_dn, struct gp_link ***ret)
+{
+ TALLOC_CTX *mem_ctx;
+ struct ldb_dn *dn;
+ struct ldb_result *result;
+ struct gp_link **gplinks;
+ char *gplink_str;
+ int rv;
+ unsigned int i, j;
+ NTSTATUS status;
+
+ /* Create a forked memory context, as a base for everything here */
+ mem_ctx = talloc_new(gp_ctx);
+
+ dn = ldb_dn_new(mem_ctx, gp_ctx->ldb_ctx, req_dn);
+
+ rv = ldb_search(gp_ctx->ldb_ctx, mem_ctx, &result, dn, LDB_SCOPE_BASE, NULL, "(objectclass=*)");
+ if (rv != LDB_SUCCESS) {
+ DEBUG(0, ("LDB search failed: %s\n%s\n", ldb_strerror(rv), ldb_errstring(gp_ctx->ldb_ctx)));
+ talloc_free(mem_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ for (i = 0; i < result->count; i++) {
+ for (j = 0; j < result->msgs[i]->num_elements; j++) {
+ struct ldb_message_element *element = &result->msgs[i]->elements[j];
+
+ if (strcmp(element->name, "gPLink") == 0) {
+ SMB_ASSERT(element->num_values > 0);
+ gplink_str = talloc_strdup(mem_ctx, (char *) element->values[0].data);
+ goto found;
+ }
+ }
+ }
+ DEBUG(0, ("Object or gPLink attribute not found.\n"));
+ return NT_STATUS_NOT_FOUND;
+
+ found:
+
+ status = parse_gplink(gp_ctx, gplink_str, &gplinks);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to parse gPLink\n"));
+ return status;
+ }
+
+ talloc_free(mem_ctx);
+
+ *ret = gplinks;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS gp_list_gpos(struct gp_context *gp_ctx, struct security_token *token, const char ***ret)
+{
+ TALLOC_CTX *mem_ctx;
+ const char **gpos;
+ struct ldb_result *result;
+ const char *sid;
+ struct ldb_dn *dn;
+ struct ldb_message_element *element;
+ int inherit;
+ const char *attrs[] = { "objectClass", NULL };
+ int rv;
+ NTSTATUS status;
+ unsigned int count = 0;
+ unsigned int i;
+ enum {
+ ACCOUNT_TYPE_USER = 0,
+ ACCOUNT_TYPE_MACHINE = 1
+ } account_type;
+
+ /* Create a forked memory context, as a base for everything here */
+ mem_ctx = talloc_new(gp_ctx);
+
+ sid = dom_sid_string(mem_ctx, token->user_sid);
+
+ /* Find the user DN and objectclass via the sid from the security token */
+ rv = ldb_search(gp_ctx->ldb_ctx,
+ mem_ctx,
+ &result,
+ ldb_get_default_basedn(gp_ctx->ldb_ctx),
+ LDB_SCOPE_SUBTREE,
+ attrs,
+ "(&(objectclass=user)(objectSid=%s))", sid);
+ if (rv != LDB_SUCCESS) {
+ DEBUG(0, ("LDB search failed: %s\n%s\n", ldb_strerror(rv),
+ ldb_errstring(gp_ctx->ldb_ctx)));
+ talloc_free(mem_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+ if (result->count != 1) {
+ DEBUG(0, ("Could not find user with sid %s.\n", sid));
+ talloc_free(mem_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+ DEBUG(10,("Found DN for this user: %s\n", ldb_dn_get_linearized(result->msgs[0]->dn)));
+
+ element = ldb_msg_find_element(result->msgs[0], "objectClass");
+
+ /* We need to know if this account is a user or machine. */
+ account_type = ACCOUNT_TYPE_USER;
+ for (i = 0; i < element->num_values; i++) {
+ if (strcmp((char *)element->values[i].data, "computer") == 0) {
+ account_type = ACCOUNT_TYPE_MACHINE;
+ DEBUG(10, ("This user is a machine\n"));
+ }
+ }
+
+ gpos = talloc_array(gp_ctx, const char *, 1);
+ gpos[0] = NULL;
+
+ /* Walk through the containers until we hit the root */
+ inherit = 1;
+ dn = ldb_dn_get_parent(mem_ctx, result->msgs[0]->dn);
+ while (ldb_dn_compare_base(ldb_get_default_basedn(gp_ctx->ldb_ctx), dn) == 0) {
+ const char *gpo_attrs[] = { "gPLink", "gPOptions", NULL };
+ struct gp_link **gplinks;
+ enum gpo_inheritance gpoptions;
+
+ DEBUG(10, ("Getting gPLinks for DN: %s\n", ldb_dn_get_linearized(dn)));
+
+ /* Get the gPLink and gPOptions attributes from the container */
+ rv = ldb_search(gp_ctx->ldb_ctx,
+ mem_ctx,
+ &result,
+ dn,
+ LDB_SCOPE_BASE,
+ gpo_attrs,
+ "objectclass=*");
+ if (rv != LDB_SUCCESS) {
+ DEBUG(0, ("LDB search failed: %s\n%s\n", ldb_strerror(rv),
+ ldb_errstring(gp_ctx->ldb_ctx)));
+ talloc_free(mem_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ /* Parse the gPLink attribute, put it into a nice struct array */
+ status = parse_gplink(mem_ctx, ldb_msg_find_attr_as_string(result->msgs[0], "gPLink", ""), &gplinks);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to parse gPLink\n"));
+ talloc_free(mem_ctx);
+ return status;
+ }
+
+ /* Check all group policy links on this container */
+ for (i = 0; gplinks[i] != NULL; i++) {
+ struct gp_object *gpo;
+ uint32_t access_granted;
+
+ /* If inheritance was blocked at a higher level and this
+ * gplink is not enforced, it should not be applied */
+ if (!inherit && !(gplinks[i]->options & GPLINK_OPT_ENFORCE))
+ continue;
+
+ /* Don't apply disabled links */
+ if (gplinks[i]->options & GPLINK_OPT_DISABLE)
+ continue;
+
+ /* Get GPO information */
+ status = gp_get_gpo_info(gp_ctx, gplinks[i]->dn, &gpo);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to get gpo information for %s\n", gplinks[i]->dn));
+ talloc_free(mem_ctx);
+ return status;
+ }
+
+ /* If the account does not have read access, this GPO does not apply
+ * to this account */
+ status = sec_access_check(gpo->security_descriptor,
+ token,
+ (SEC_STD_READ_CONTROL | SEC_ADS_LIST | SEC_ADS_READ_PROP),
+ &access_granted);
+ if (!NT_STATUS_IS_OK(status)) {
+ continue;
+ }
+
+ /* If the account is a user and the GPO has user disabled flag, or
+ * a machine and the GPO has machine disabled flag, this GPO does
+ * not apply to this account */
+ if ((account_type == ACCOUNT_TYPE_USER &&
+ (gpo->flags & GPO_FLAG_USER_DISABLE)) ||
+ (account_type == ACCOUNT_TYPE_MACHINE &&
+ (gpo->flags & GPO_FLAG_MACHINE_DISABLE))) {
+ continue;
+ }
+
+ /* Add the GPO to the list */
+ gpos = talloc_realloc(gp_ctx, gpos, const char *, count+2);
+ gpos[count] = talloc_strdup(gp_ctx, gplinks[i]->dn);
+ gpos[count+1] = NULL;
+ count++;
+
+ /* Clean up */
+ talloc_free(gpo);
+ }
+
+ /* If inheritance is blocked, then we should only add enforced gPLinks
+ * higher up */
+ gpoptions = ldb_msg_find_attr_as_uint(result->msgs[0], "gPOptions", 0);
+ if (gpoptions == GPO_BLOCK_INHERITANCE) {
+ inherit = 0;
+ }
+ dn = ldb_dn_get_parent(mem_ctx, dn);
+ }
+
+ talloc_free(mem_ctx);
+
+ *ret = gpos;
+ return NT_STATUS_OK;
+}
generated by cgit (git 2.34.1) at 2024-11-19 03:31:28 +0000