hdb-ldb.c

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/*
 * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
 * Copyright (c) 2004, Andrew Bartlett <[e-mail]>.
 * Copyright (c) 2004, Stefan Metzmacher <[e-mail]>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of PADL Software  nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "includes.h"
#include "system/time.h"
#include "kdc.h"
#include "dsdb/common/flags.h"
#include "hdb.h"
#include "krb5_locl.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "librpc/gen_ndr/netlogon.h"
#include "auth/auth.h"
#include "auth/credentials/credentials.h"
#include "auth/auth_sam.h"
#include "util/util_ldb.h"
#include "dsdb/samdb/samdb.h"
#include "librpc/ndr/libndr.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "libcli/auth/libcli_auth.h"
#include "param/param.h"
#include "events/events.h"

enum hdb_ldb_ent_type 
{ HDB_LDB_ENT_TYPE_CLIENT, HDB_LDB_ENT_TYPE_SERVER, 
  HDB_LDB_ENT_TYPE_KRBTGT, HDB_LDB_ENT_TYPE_ANY };

static const char *realm_ref_attrs[] = {
	"nCName", 
	"dnsRoot", 
	NULL
};

static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
{
    const char *tmp;
    const char *gentime;
    struct tm tm;

    gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
    if (!gentime)
	return default_val;

    tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
    if (tmp == NULL) {
	    return default_val;
    }

    return timegm(&tm);
}

static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_ldb_ent_type ent_type) 
{
	HDBFlags flags = int2HDBFlags(0);

	/* we don't allow kadmin deletes */
	flags.immutable = 1;

	/* mark the principal as invalid to start with */
	flags.invalid = 1;

	flags.renewable = 1;

	/* All accounts are servers, but this may be disabled again in the caller */
	flags.server = 1;

	/* Account types - clear the invalid bit if it turns out to be valid */
	if (userAccountControl & UF_NORMAL_ACCOUNT) {
		if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.client = 1;
		}
		flags.invalid = 0;
	}
	
	if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
		if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.client = 1;
		}
		flags.invalid = 0;
	}
	if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
		if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.client = 1;
		}
		flags.invalid = 0;
	}
	if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
		if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.client = 1;
		}
		flags.invalid = 0;
	}

	/* Not permitted to act as a client if disabled */
	if (userAccountControl & UF_ACCOUNTDISABLE) {
		flags.client = 0;
	}
	if (userAccountControl & UF_LOCKOUT) {
		flags.invalid = 1;
	}
/*
	if (userAccountControl & UF_PASSWORD_NOTREQD) {
		flags.invalid = 1;
	}
*/
/*
	UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
*/
	if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
		flags.invalid = 1;
	}

/* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in LDB_message2entry() */

/*
	if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
		flags.invalid = 1;
	}
*/
	if (userAccountControl & UF_SMARTCARD_REQUIRED) {
		flags.require_hwauth = 1;
	}
	if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
		flags.ok_as_delegate = 1;
	}	
	if (!(userAccountControl & UF_NOT_DELEGATED)) {
		flags.forwardable = 1;
		flags.proxiable = 1;
	}

	if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
		flags.require_preauth = 0;
	} else {
		flags.require_preauth = 1;

	}
	return flags;
}

static int hdb_ldb_destrutor(struct hdb_ldb_private *private)
{
    hdb_entry_ex *entry_ex = private->entry_ex;
    free_hdb_entry(&entry_ex->entry);
    return 0;
}

static void hdb_ldb_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
{
	talloc_free(entry_ex->ctx);
}

static krb5_error_code LDB_message2entry_keys(krb5_context context,
					      struct smb_iconv_convenience *iconv_convenience,
					      TALLOC_CTX *mem_ctx,
					      struct ldb_message *msg,
					      unsigned int userAccountControl,
					      hdb_entry_ex *entry_ex)
{
	krb5_error_code ret = 0;
	enum ndr_err_code ndr_err;
	struct samr_Password *hash;
	const struct ldb_val *sc_val;
	struct supplementalCredentialsBlob scb;
	struct supplementalCredentialsPackage *scp = NULL;
	struct package_PrimaryKerberosBlob _pkb;
	struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
	uint32_t i;
	uint32_t allocated_keys = 0;

	entry_ex->entry.keys.val = NULL;
	entry_ex->entry.keys.len = 0;

	entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);

	/* Get keys from the db */

	hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
	sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");

	/* unicodePwd for enctype 0x17 (23) if present */
	if (hash) {
		allocated_keys++;
	}

	/* supplementalCredentials if present */
	if (sc_val) {
		ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, iconv_convenience, &scb,
						   (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
			dump_data(0, sc_val->data, sc_val->length);
			ret = EINVAL;
			goto out;
		}

		for (i=0; i < scb.sub.num_packages; i++) {
			if (scb.sub.packages[i].unknown1 != 0x00000001) {
				continue;
			}

			if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) != 0) {
				continue;
			}

			if (!scb.sub.packages[i].data || !scb.sub.packages[i].data[0]) {
				continue;
			}

			scp = &scb.sub.packages[i];
			break;
		}
	}
	/* Primary:Kerberos element of supplementalCredentials */
	if (scp) {
		DATA_BLOB blob;

		blob = strhex_to_data_blob(scp->data);
		if (!blob.data) {
			ret = ENOMEM;
			goto out;
		}
		talloc_steal(mem_ctx, blob.data);

		/* TODO: use ndr_pull_struct_blob_all(), when the ndr layer handles it correct with relative pointers */
		ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, iconv_convenience, &_pkb,
					       (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
			krb5_set_error_string(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
			krb5_warnx(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
			ret = EINVAL;
			goto out;
		}

		if (_pkb.version != 3) {
			krb5_set_error_string(context, "LDB_message2entry_keys: could not parse PrimaryKerberos not version 3");
			krb5_warnx(context, "LDB_message2entry_keys: could not parse PrimaryKerberos not version 3");
			ret = EINVAL;
			goto out;
		}
		
		pkb3 = &_pkb.ctr.ctr3;

		allocated_keys += pkb3->num_keys;
	}

	if (allocated_keys == 0) {
		/* oh, no password.  Apparently (comment in
		 * hdb-ldap.c) this violates the ASN.1, but this
		 * allows an entry with no keys (yet). */
		return 0;
	}

	/* allocate space to decode into */
	entry_ex->entry.keys.len = 0;
	entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
	if (entry_ex->entry.keys.val == NULL) {
		ret = ENOMEM;
		goto out;
	}

	if (hash && !(userAccountControl & UF_USE_DES_KEY_ONLY)) {
		Key key;

		key.mkvno = 0;
		key.salt = NULL; /* No salt for this enc type */

		ret = krb5_keyblock_init(context,
					 ENCTYPE_ARCFOUR_HMAC_MD5,
					 hash->hash, sizeof(hash->hash), 
					 &key.key);
		if (ret) {
			goto out;
		}

		entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
		entry_ex->entry.keys.len++;
	}

	if (pkb3) {
		for (i=0; i < pkb3->num_keys; i++) {
			bool use = true;
			Key key;

			if (!pkb3->keys[i].value) continue;

			if (userAccountControl & UF_USE_DES_KEY_ONLY) {
				switch (pkb3->keys[i].keytype) {
				case ENCTYPE_DES_CBC_CRC:
				case ENCTYPE_DES_CBC_MD5:
					break;
				default:
					use = false;
					break;
				}
			}

			if (!use) continue;

			key.mkvno = 0;

			if (pkb3->salt.string) {
				DATA_BLOB salt;

				salt = data_blob_string_const(pkb3->salt.string);

				key.salt = calloc(1, sizeof(*key.salt));
				if (key.salt == NULL) {
					ret = ENOMEM;
					goto out;
				}

				key.salt->type = hdb_pw_salt;

				ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
				if (ret) {
					free(key.salt);
					key.salt = NULL;
					goto out;
				}
			}

			ret = krb5_keyblock_init(context,
						 pkb3->keys[i].keytype,
						 pkb3->keys[i].value->data,
						 pkb3->keys[i].value->length,
						 &key.key);
			if (ret) {
				if (key.salt) {
					free_Salt(key.salt);
					free(key.salt);
					key.salt = NULL;
				}
				goto out;
			}

			entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
			entry_ex->entry.keys.len++;
		}
	}

out:
	if (ret != 0) {
		entry_ex->entry.keys.len = 0;
	}
	if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
		free(entry_ex->entry.keys.val);
		entry_ex->entry.keys.val = NULL;
	}
	return ret;
}

/*
 * Construct an hdb_entry from a directory entry.
 */
static krb5_error_code LDB_message2entry(krb5_context context, HDB *db, 
					 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
					 enum hdb_ldb_ent_type ent_type, 
					 struct ldb_message *msg,
					 struct ldb_message *realm_ref_msg,
					 hdb_entry_ex *entry_ex)
{
	unsigned int userAccountControl;
	int i;
	krb5_error_code ret = 0;