diff options
Diffstat (limited to 'auth/credentials/credentials_secrets.c')
| -rw-r--r-- | auth/credentials/credentials_secrets.c | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/auth/credentials/credentials_secrets.c b/auth/credentials/credentials_secrets.c new file mode 100644 index 0000000..ab2c9dd --- /dev/null +++ b/auth/credentials/credentials_secrets.c @@ -0,0 +1,485 @@ +/* + 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: + 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; +} + + |