Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 486 insertions, 0 deletions

diff --git a/auth/credentials/credentials_secrets.c b/auth/credentials/credentials_secrets.c
new file mode 100644
index 0000000..8469d6e
--- /dev/null
+++ b/auth/credentials/credentials_secrets.c
@@ -0,0 +1,486 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   User credentials handling (as regards on-disk files)
+
+   Copyright (C) Jelmer Vernooij 2005
+   Copyright (C) Tim Potter 2001
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+
+   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 "lib/events/events.h"
+#include <ldb.h>
+#include "librpc/gen_ndr/samr.h" /* for struct samrPassword */
+#include "param/secrets.h"
+#include "system/filesys.h"
+#include "auth/credentials/credentials.h"
+#include "auth/credentials/credentials_internal.h"
+#include "auth/credentials/credentials_krb5.h"
+#include "auth/kerberos/kerberos_util.h"
+#include "param/param.h"
+#include "lib/events/events.h"
+#include "dsdb/samdb/samdb.h"
+#include "source3/include/secrets.h"
+#include "dbwrap/dbwrap.h"
+#include "dbwrap/dbwrap_open.h"
+#include "lib/util/util_tdb.h"
+#include "libds/common/roles.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+/**
+ * Fill in credentials for the machine trust account, from the secrets database.
+ *
+ * @param cred Credentials structure to fill in
+ * @retval NTSTATUS error detailing any failure
+ */
+static NTSTATUS cli_credentials_set_secrets_lct(struct cli_credentials *cred,
+						struct loadparm_context *lp_ctx,
+						struct ldb_context *ldb,
+						const char *base,
+						const char *filter,
+						time_t secrets_tdb_last_change_time,
+						const char *secrets_tdb_password,
+						char **error_string)
+{
+	TALLOC_CTX *mem_ctx;
+
+	int ldb_ret;
+	struct ldb_message *msg;
+
+	const char *machine_account;
+	const char *password;
+	const char *domain;
+	const char *realm;
+	enum netr_SchannelType sct;
+	const char *salt_principal;
+	char *keytab;
+	const struct ldb_val *whenChanged;
+	time_t lct;
+
+	/* ok, we are going to get it now, don't recurse back here */
+	cred->machine_account_pending = false;
+
+	/* some other parts of the system will key off this */
+	cred->machine_account = true;
+
+	mem_ctx = talloc_named(cred, 0, "cli_credentials_set_secrets from ldb");
+
+	if (!ldb) {
+		/* Local secrets are stored in secrets.ldb */
+		ldb = secrets_db_connect(mem_ctx, lp_ctx);
+		if (!ldb) {
+			*error_string = talloc_strdup(cred, "Could not open secrets.ldb");
+			talloc_free(mem_ctx);
+			return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+		}
+	}
+
+	ldb_ret = dsdb_search_one(ldb, mem_ctx, &msg,
+				  ldb_dn_new(mem_ctx, ldb, base),
+				  LDB_SCOPE_SUBTREE,
+				  NULL, 0, "%s", filter);
+
+	if (ldb_ret != LDB_SUCCESS) {
+		*error_string = talloc_asprintf(cred, "Could not find entry to match filter: '%s' base: '%s': %s: %s",
+						filter, base ? base : "",
+						ldb_strerror(ldb_ret), ldb_errstring(ldb));
+		talloc_free(mem_ctx);
+		return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+	}
+
+	password = ldb_msg_find_attr_as_string(msg, "secret", NULL);
+
+	whenChanged = ldb_msg_find_ldb_val(msg, "whenChanged");
+	if (!whenChanged || ldb_val_to_time(whenChanged, &lct) != LDB_SUCCESS) {
+		/* This attribute is mandatory */
+		talloc_free(mem_ctx);
+		return NT_STATUS_NOT_FOUND;
+	}
+
+	/* Don't set secrets.ldb info if the secrets.tdb entry was more recent */
+	if (lct < secrets_tdb_last_change_time) {
+		talloc_free(mem_ctx);
+		return NT_STATUS_NOT_FOUND;
+	}
+
+	if ((lct == secrets_tdb_last_change_time) &&
+	    (secrets_tdb_password != NULL) &&
+	    (password != NULL) &&
+	    (strcmp(password, secrets_tdb_password) != 0)) {
+		talloc_free(mem_ctx);
+		return NT_STATUS_NOT_FOUND;
+	}
+
+	cli_credentials_set_password_last_changed_time(cred, lct);
+
+	machine_account = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
+
+	if (!machine_account) {
+		machine_account = ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL);
+
+		if (!machine_account) {
+			const char *ldap_bind_dn = ldb_msg_find_attr_as_string(msg, "ldapBindDn", NULL);
+			if (!ldap_bind_dn) {
+				*error_string = talloc_asprintf(cred,
+								"Could not find 'samAccountName', "
+								"'servicePrincipalName' or "
+								"'ldapBindDn' in secrets record: %s",
+								ldb_dn_get_linearized(msg->dn));
+				talloc_free(mem_ctx);
+				return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+			} else {
+				/* store bind dn in credentials */
+				cli_credentials_set_bind_dn(cred, ldap_bind_dn);
+			}
+		}
+	}
+
+	salt_principal = ldb_msg_find_attr_as_string(msg, "saltPrincipal", NULL);
+	cli_credentials_set_salt_principal(cred, salt_principal);
+
+	sct = ldb_msg_find_attr_as_int(msg, "secureChannelType", 0);
+	if (sct) {
+		cli_credentials_set_secure_channel_type(cred, sct);
+	}
+
+	if (!password) {
+		const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msg, "unicodePwd");
+		struct samr_Password hash;
+		ZERO_STRUCT(hash);
+		if (nt_password_hash) {
+			memcpy(hash.hash, nt_password_hash->data,
+			       MIN(nt_password_hash->length, sizeof(hash.hash)));
+
+			cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
+		} else {
+			cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
+		}
+	} else {
+		cli_credentials_set_password(cred, password, CRED_SPECIFIED);
+	}
+
+	domain = ldb_msg_find_attr_as_string(msg, "flatname", NULL);
+	if (domain) {
+		cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
+	}
+
+	realm = ldb_msg_find_attr_as_string(msg, "realm", NULL);
+	if (realm) {
+		cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
+	}
+
+	if (machine_account) {
+		cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
+	}
+
+	cli_credentials_set_kvno(cred, ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0));
+
+	/* If there was an external keytab specified by reference in
+	 * the LDB, then use this.  Otherwise we will make one up
+	 * (chewing CPU time) from the password */
+	keytab = keytab_name_from_msg(cred, ldb, msg);
+	if (keytab) {
+		cli_credentials_set_keytab_name(cred, lp_ctx, keytab, CRED_SPECIFIED);
+		talloc_free(keytab);
+	}
+	talloc_free(mem_ctx);
+
+	return NT_STATUS_OK;
+}
+
+
+/**
+ * Fill in credentials for the machine trust account, from the secrets database.
+ *
+ * @param cred Credentials structure to fill in
+ * @retval NTSTATUS error detailing any failure
+ */
+_PUBLIC_ NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred,
+					      struct loadparm_context *lp_ctx,
+					      struct ldb_context *ldb,
+					      const char *base,
+					      const char *filter,
+					      char **error_string)
+{
+	NTSTATUS status = cli_credentials_set_secrets_lct(cred, lp_ctx, ldb, base, filter, 0, NULL, error_string);
+	if (!NT_STATUS_IS_OK(status)) {
+		/* set anonymous as the fallback, if the machine account won't work */
+		cli_credentials_set_anonymous(cred);
+	}
+	return status;
+}
+
+/**
+ * Fill in credentials for the machine trust account, from the secrets database.
+ *
+ * @param cred Credentials structure to fill in
+ * @retval NTSTATUS error detailing any failure
+ */
+_PUBLIC_ NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred,
+						      struct loadparm_context *lp_ctx)
+{
+	struct db_context *db_ctx;
+	char *secrets_tdb_path;
+	int hash_size, tdb_flags;
+
+	secrets_tdb_path = lpcfg_private_db_path(cred, lp_ctx, "secrets");
+	if (secrets_tdb_path == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	hash_size = lpcfg_tdb_hash_size(lp_ctx, secrets_tdb_path);
+	tdb_flags = lpcfg_tdb_flags(lp_ctx, TDB_DEFAULT);
+
+	db_ctx = dbwrap_local_open(
+		cred,
+		secrets_tdb_path,
+		hash_size,
+		tdb_flags,
+		O_RDWR,
+		0600,
+		DBWRAP_LOCK_ORDER_1,
+		DBWRAP_FLAG_NONE);
+	TALLOC_FREE(secrets_tdb_path);
+
+	/*
+	 * We do not check for errors here, we might not have a
+	 * secrets.tdb at all, and so we just need to check the
+	 * secrets.ldb
+	 */
+	return cli_credentials_set_machine_account_db_ctx(cred, lp_ctx, db_ctx);
+}
+
+/**
+ * Fill in credentials for the machine trust account, from the
+ * secrets.ldb or passed in handle to secrets.tdb (perhaps in CTDB).
+ *
+ * This version is used in parts of the code that can link in the
+ * CTDB dbwrap backend, by passing down the already open handle.
+ *
+ * @param cred Credentials structure to fill in
+ * @param db_ctx dbwrap context for secrets.tdb
+ * @retval NTSTATUS error detailing any failure
+ */
+_PUBLIC_ NTSTATUS cli_credentials_set_machine_account_db_ctx(struct cli_credentials *cred,
+							     struct loadparm_context *lp_ctx,
+							     struct db_context *db_ctx)
+{
+	NTSTATUS status;
+	char *filter;
+	char *error_string = NULL;
+	const char *domain;
+	bool secrets_tdb_password_more_recent;
+	time_t secrets_tdb_lct = 0;
+	char *secrets_tdb_password = NULL;
+	char *secrets_tdb_old_password = NULL;
+	uint32_t secrets_tdb_secure_channel_type = SEC_CHAN_NULL;
+	int server_role = lpcfg_server_role(lp_ctx);
+	int security = lpcfg_security(lp_ctx);
+	char *keystr;
+	char *keystr_upper = NULL;
+	TALLOC_CTX *tmp_ctx = talloc_named(cred, 0, "cli_credentials_set_secrets from ldb");
+	if (!tmp_ctx) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* Bleh, nasty recursion issues: We are setting a machine
+	 * account here, so we don't want the 'pending' flag around
+	 * any more */
+	cred->machine_account_pending = false;
+
+	/* We have to do this, as the fallback in
+	 * cli_credentials_set_secrets is to run as anonymous, so the domain is wiped */
+	domain = cli_credentials_get_domain(cred);
+
+	if (db_ctx) {
+		TDB_DATA dbuf;
+		keystr = talloc_asprintf(tmp_ctx, "%s/%s",
+					 SECRETS_MACHINE_LAST_CHANGE_TIME,
+					 domain);
+		keystr_upper = strupper_talloc(tmp_ctx, keystr);
+		status = dbwrap_fetch(db_ctx, tmp_ctx, string_tdb_data(keystr_upper),
+				      &dbuf);
+		if (NT_STATUS_IS_OK(status) && dbuf.dsize == 4) {
+			secrets_tdb_lct = IVAL(dbuf.dptr,0);
+		}
+
+		keystr = talloc_asprintf(tmp_ctx, "%s/%s",
+					 SECRETS_MACHINE_PASSWORD,
+					 domain);
+		keystr_upper = strupper_talloc(tmp_ctx, keystr);
+		status = dbwrap_fetch(db_ctx, tmp_ctx, string_tdb_data(keystr_upper),
+				      &dbuf);
+		if (NT_STATUS_IS_OK(status)) {
+			secrets_tdb_password = (char *)dbuf.dptr;
+		}
+
+		keystr = talloc_asprintf(tmp_ctx, "%s/%s",
+					 SECRETS_MACHINE_PASSWORD_PREV,
+					 domain);
+		keystr_upper = strupper_talloc(tmp_ctx, keystr);
+		status = dbwrap_fetch(db_ctx, tmp_ctx, string_tdb_data(keystr_upper),
+				      &dbuf);
+		if (NT_STATUS_IS_OK(status)) {
+			secrets_tdb_old_password = (char *)dbuf.dptr;
+		}
+
+		keystr = talloc_asprintf(tmp_ctx, "%s/%s",
+					 SECRETS_MACHINE_SEC_CHANNEL_TYPE,
+					 domain);
+		keystr_upper = strupper_talloc(tmp_ctx, keystr);
+		status = dbwrap_fetch(db_ctx, tmp_ctx, string_tdb_data(keystr_upper),
+				      &dbuf);
+		if (NT_STATUS_IS_OK(status) && dbuf.dsize == 4) {
+			secrets_tdb_secure_channel_type = IVAL(dbuf.dptr,0);
+		}
+	}
+
+	filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER, 
+				 domain);
+	status = cli_credentials_set_secrets_lct(cred, lp_ctx, NULL,
+						 SECRETS_PRIMARY_DOMAIN_DN,
+						 filter, secrets_tdb_lct, secrets_tdb_password, &error_string);
+	if (secrets_tdb_password == NULL) {
+		secrets_tdb_password_more_recent = false;
+	} else if (NT_STATUS_EQUAL(NT_STATUS_CANT_ACCESS_DOMAIN_INFO, status)
+	    || NT_STATUS_EQUAL(NT_STATUS_NOT_FOUND, status)) {
+		secrets_tdb_password_more_recent = true;
+	} else if (secrets_tdb_lct > cli_credentials_get_password_last_changed_time(cred)) {
+		secrets_tdb_password_more_recent = true;
+	} else if (secrets_tdb_lct == cli_credentials_get_password_last_changed_time(cred)) {
+		secrets_tdb_password_more_recent = strcmp(secrets_tdb_password, cli_credentials_get_password(cred)) != 0;
+	} else {
+		secrets_tdb_password_more_recent = false;
+	}
+
+	if (secrets_tdb_password_more_recent) {
+		enum credentials_use_kerberos use_kerberos =
+			CRED_USE_KERBEROS_DISABLED;
+		char *machine_account = talloc_asprintf(tmp_ctx, "%s$", lpcfg_netbios_name(lp_ctx));
+		cli_credentials_set_password(cred, secrets_tdb_password, CRED_SPECIFIED);
+		cli_credentials_set_old_password(cred, secrets_tdb_old_password, CRED_SPECIFIED);
+		cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
+		if (strequal(domain, lpcfg_workgroup(lp_ctx))) {
+			cli_credentials_set_realm(cred, lpcfg_realm(lp_ctx), CRED_SPECIFIED);
+
+			switch (server_role) {
+			case ROLE_DOMAIN_MEMBER:
+				if (security != SEC_ADS) {
+					break;
+				}
+
+				FALL_THROUGH;
+			case ROLE_ACTIVE_DIRECTORY_DC:
+			case ROLE_IPA_DC:
+				use_kerberos = CRED_USE_KERBEROS_DESIRED;
+				break;
+			}
+		}
+		cli_credentials_set_kerberos_state(cred,
+						   use_kerberos,
+						   CRED_SPECIFIED);
+		cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
+		cli_credentials_set_password_last_changed_time(cred, secrets_tdb_lct);
+		cli_credentials_set_secure_channel_type(cred, secrets_tdb_secure_channel_type);
+		status = NT_STATUS_OK;
+	} else if (!NT_STATUS_IS_OK(status)) {
+		if (db_ctx) {
+			error_string
+				= talloc_asprintf(cred,
+						  "Failed to fetch machine account password for %s from both "
+						  "secrets.ldb (%s) and from %s",
+						  domain,
+						  error_string == NULL ? "error" : error_string,
+						  dbwrap_name(db_ctx));
+		} else {
+			char *secrets_tdb_path;
+
+			secrets_tdb_path = lpcfg_private_db_path(tmp_ctx,
+								 lp_ctx,
+								 "secrets");
+			if (secrets_tdb_path == NULL) {
+				return NT_STATUS_NO_MEMORY;
+			}
+
+			error_string = talloc_asprintf(cred,
+						       "Failed to fetch machine account password from "
+						       "secrets.ldb: %s and failed to open %s",
+						       error_string == NULL ? "error" : error_string,
+						       secrets_tdb_path);
+		}
+		DEBUG(1, ("Could not find machine account in secrets database: %s: %s\n",
+			  error_string == NULL ? "error" : error_string,
+			  nt_errstr(status)));
+		/* set anonymous as the fallback, if the machine account won't work */
+		cli_credentials_set_anonymous(cred);
+	}
+
+	TALLOC_FREE(tmp_ctx);
+	return status;
+}
+
+/**
+ * Fill in credentials for a particular principal, from the secrets database.
+ *
+ * @param cred Credentials structure to fill in
+ * @retval NTSTATUS error detailing any failure
+ */
+_PUBLIC_ NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
+					      struct loadparm_context *lp_ctx,
+					      const char *serviceprincipal)
+{
+	NTSTATUS status;
+	char *filter;
+	char *error_string = NULL;
+	/* Bleh, nasty recursion issues: We are setting a machine
+	 * account here, so we don't want the 'pending' flag around
+	 * any more */
+	cred->machine_account_pending = false;
+	filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
+				 cli_credentials_get_realm(cred),
+				 cli_credentials_get_domain(cred),
+				 serviceprincipal);
+	status = cli_credentials_set_secrets_lct(cred, lp_ctx, NULL,
+					     SECRETS_PRINCIPALS_DN, filter,
+					     0, NULL, &error_string);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Could not find %s principal in secrets database: %s: %s\n",
+			  serviceprincipal, nt_errstr(status),
+			  error_string ? error_string : "<no error>"));
+	}
+	return status;
+}
+
+/**
+ * Ask that when required, the credentials system will be filled with
+ * machine trust account, from the secrets database.
+ *
+ * @param cred Credentials structure to fill in
+ * @note This function is used to call the above function after, rather
+ *       than during, popt processing.
+ *
+ */
+_PUBLIC_ void cli_credentials_set_machine_account_pending(struct cli_credentials *cred,
+						 struct loadparm_context *lp_ctx)
+{
+	cred->machine_account_pending = true;
+	cred->machine_account_pending_lp_ctx = lp_ctx;
+}
+
+