kerberos_pac.c

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		file_save("tmp_pac_data-admin.dat",blob.data,blob.length);
	}
#endif

	DEBUG(3,("Found account name from PAC: %s [%s]\n",
		 logon_info->info3.base.account_name.string, 
		 logon_info->info3.base.full_name.string));
	*pac_data_out = pac_data;

	return NT_STATUS_OK;
}

_PUBLIC_  NTSTATUS kerberos_pac_logon_info(TALLOC_CTX *mem_ctx,
				  struct smb_iconv_convenience *iconv_convenience,
				  struct PAC_LOGON_INFO **logon_info,
				  DATA_BLOB blob,
				  krb5_context context,
				  const krb5_keyblock *krbtgt_keyblock,
				  const krb5_keyblock *service_keyblock,
				  krb5_const_principal client_principal,
				  time_t tgs_authtime, 
				  krb5_error_code *k5ret)
{
	NTSTATUS nt_status;
	struct PAC_DATA *pac_data;
	int i;
	nt_status = kerberos_decode_pac(mem_ctx, 
					iconv_convenience,
					&pac_data,
					blob,
					context,
					krbtgt_keyblock,
					service_keyblock,
					client_principal, 
					tgs_authtime,
					k5ret);
	if (!NT_STATUS_IS_OK(nt_status)) {
		return nt_status;
	}

	*logon_info = NULL;
	for (i=0; i < pac_data->num_buffers; i++) {
		if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
			continue;
		}
		*logon_info = pac_data->buffers[i].info->logon_info.info; 
	}
	if (!*logon_info) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	return NT_STATUS_OK;
}

static krb5_error_code make_pac_checksum(TALLOC_CTX *mem_ctx, 
					 DATA_BLOB *pac_data,
					 struct PAC_SIGNATURE_DATA *sig,
					 krb5_context context,
					 const krb5_keyblock *keyblock)
{
	krb5_error_code ret;
	krb5_crypto crypto;
	Checksum cksum;


	ret = krb5_crypto_init(context,
			       keyblock,
			       0,
			       &crypto);
	if (ret) {
		DEBUG(0,("krb5_crypto_init() failed: %s\n",
			  smb_get_krb5_error_message(context, ret, mem_ctx)));
		return ret;
	}
	ret = krb5_create_checksum(context,
				   crypto,
				   KRB5_KU_OTHER_CKSUM,
				   0,
				   pac_data->data,
				   pac_data->length,
				   &cksum);
	if (ret) {
		DEBUG(2, ("PAC Verification failed: %s\n", 
			  smb_get_krb5_error_message(context, ret, mem_ctx)));
	}

	krb5_crypto_destroy(context, crypto);

	if (ret) {
		return ret;
	}

	sig->type = cksum.cksumtype;
	sig->signature = data_blob_talloc(mem_ctx, cksum.checksum.data, cksum.checksum.length);
	free_Checksum(&cksum);

	return 0;
}

 krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx,
				     struct smb_iconv_convenience *iconv_convenience,
				    struct PAC_DATA *pac_data,
				    krb5_context context,
				    const krb5_keyblock *krbtgt_keyblock,
				    const krb5_keyblock *service_keyblock,
				    DATA_BLOB *pac) 
{
	NTSTATUS nt_status;
	krb5_error_code ret;
	enum ndr_err_code ndr_err;
	DATA_BLOB zero_blob = data_blob(NULL, 0);
	DATA_BLOB tmp_blob = data_blob(NULL, 0);
	struct PAC_SIGNATURE_DATA *kdc_checksum = NULL;
	struct PAC_SIGNATURE_DATA *srv_checksum = NULL;
	int i;

	/* First, just get the keytypes filled in (and lengths right, eventually) */
	for (i=0; i < pac_data->num_buffers; i++) {
		if (pac_data->buffers[i].type != PAC_TYPE_KDC_CHECKSUM) {
			continue;
		}
		kdc_checksum = &pac_data->buffers[i].info->kdc_cksum, 
		ret = make_pac_checksum(mem_ctx, &zero_blob,
					kdc_checksum, 
					context, krbtgt_keyblock);
		if (ret) {
			DEBUG(2, ("making krbtgt PAC checksum failed: %s\n", 
				  smb_get_krb5_error_message(context, ret, mem_ctx)));
			talloc_free(pac_data);
			return ret;
		}
	}
	
	for (i=0; i < pac_data->num_buffers; i++) {
		if (pac_data->buffers[i].type != PAC_TYPE_SRV_CHECKSUM) {
			continue;
		}
		srv_checksum = &pac_data->buffers[i].info->srv_cksum; 
		ret = make_pac_checksum(mem_ctx, &zero_blob, 
					srv_checksum, 
					context, service_keyblock);
		if (ret) {
			DEBUG(2, ("making service PAC checksum failed: %s\n", 
				  smb_get_krb5_error_message(context, ret, mem_ctx)));
			talloc_free(pac_data);
			return ret;
		}
	}

	if (!kdc_checksum) {
		DEBUG(2, ("Invalid PAC constructed for signing, no KDC checksum present!"));
		return EINVAL;
	}
	if (!srv_checksum) {
		DEBUG(2, ("Invalid PAC constructed for signing, no SRV checksum present!"));
		return EINVAL;
	}

	/* But wipe out the actual signatures */
	memset(kdc_checksum->signature.data, '\0', kdc_checksum->signature.length);
	memset(srv_checksum->signature.data, '\0', srv_checksum->signature.length);

	ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx, 
				       iconv_convenience,
				       pac_data,
				       (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		nt_status = ndr_map_error2ntstatus(ndr_err);
		DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
		talloc_free(pac_data);
		return EINVAL;
	}

	/* Then sign the result of the previous push, where the sig was zero'ed out */
	ret = make_pac_checksum(mem_ctx, &tmp_blob, srv_checksum,
				context, service_keyblock);

	/* Then sign Server checksum */
	ret = make_pac_checksum(mem_ctx, &srv_checksum->signature, kdc_checksum, context, krbtgt_keyblock);
	if (ret) {
		DEBUG(2, ("making krbtgt PAC checksum failed: %s\n", 
			  smb_get_krb5_error_message(context, ret, mem_ctx)));
		talloc_free(pac_data);
		return ret;
	}

	/* And push it out again, this time to the world.  This relies on determanistic pointer values */
	ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx, 
				       iconv_convenience,
				       pac_data,
				       (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		nt_status = ndr_map_error2ntstatus(ndr_err);
		DEBUG(1, ("PAC (final) push failed: %s\n", nt_errstr(nt_status)));
		talloc_free(pac_data);
		return EINVAL;
	}

	*pac = tmp_blob;

	return ret;
}


 krb5_error_code kerberos_create_pac(TALLOC_CTX *mem_ctx,
				     struct smb_iconv_convenience *iconv_convenience,
				     struct auth_serversupplied_info *server_info,
				     krb5_context context,
				     const krb5_keyblock *krbtgt_keyblock,
				     const krb5_keyblock *service_keyblock,
				     krb5_principal client_principal,
				     time_t tgs_authtime,
				     DATA_BLOB *pac)
{
	NTSTATUS nt_status;
	krb5_error_code ret;
	struct PAC_DATA *pac_data = talloc(mem_ctx, struct PAC_DATA);
	struct netr_SamInfo3 *sam3;
	union PAC_INFO *u_LOGON_INFO;
	struct PAC_LOGON_INFO *LOGON_INFO;
	union PAC_INFO *u_LOGON_NAME;
	struct PAC_LOGON_NAME *LOGON_NAME;
	union PAC_INFO *u_KDC_CHECKSUM;
	union PAC_INFO *u_SRV_CHECKSUM;

	char *name;
		
	enum {
		PAC_BUF_LOGON_INFO = 0,
		PAC_BUF_LOGON_NAME = 1,
		PAC_BUF_SRV_CHECKSUM = 2,
		PAC_BUF_KDC_CHECKSUM = 3,
		PAC_BUF_NUM_BUFFERS = 4
	};

	if (!pac_data) {
		return ENOMEM;
	}

	pac_data->num_buffers = PAC_BUF_NUM_BUFFERS;
	pac_data->version = 0;

	pac_data->buffers = talloc_array(pac_data, 
					 struct PAC_BUFFER,
					 pac_data->num_buffers);
	if (!pac_data->buffers) {
		talloc_free(pac_data);
		return ENOMEM;
	}

	/* LOGON_INFO */
	u_LOGON_INFO = talloc_zero(pac_data->buffers, union PAC_INFO);
	if (!u_LOGON_INFO) {
		talloc_free(pac_data);
		return ENOMEM;
	}
	pac_data->buffers[PAC_BUF_LOGON_INFO].type = PAC_TYPE_LOGON_INFO;
	pac_data->buffers[PAC_BUF_LOGON_INFO].info = u_LOGON_INFO;

	/* LOGON_NAME */
	u_LOGON_NAME = talloc_zero(pac_data->buffers, union PAC_INFO);
	if (!u_LOGON_NAME) {
		talloc_free(pac_data);
		return ENOMEM;
	}
	pac_data->buffers[PAC_BUF_LOGON_NAME].type = PAC_TYPE_LOGON_NAME;
	pac_data->buffers[PAC_BUF_LOGON_NAME].info = u_LOGON_NAME;
	LOGON_NAME = &u_LOGON_NAME->logon_name;

	/* SRV_CHECKSUM */
	u_SRV_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
	if (!u_SRV_CHECKSUM) {
		talloc_free(pac_data);
		return ENOMEM;
	}
	pac_data->buffers[PAC_BUF_SRV_CHECKSUM].type = PAC_TYPE_SRV_CHECKSUM;
	pac_data->buffers[PAC_BUF_SRV_CHECKSUM].info = u_SRV_CHECKSUM;

	/* KDC_CHECKSUM */
	u_KDC_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
	if (!u_KDC_CHECKSUM) {
		talloc_free(pac_data);
		return ENOMEM;
	}
	pac_data->buffers[PAC_BUF_KDC_CHECKSUM].type = PAC_TYPE_KDC_CHECKSUM;
	pac_data->buffers[PAC_BUF_KDC_CHECKSUM].info = u_KDC_CHECKSUM;

	/* now the real work begins... */

	LOGON_INFO = talloc_zero(u_LOGON_INFO, struct PAC_LOGON_INFO);
	if (!LOGON_INFO) {
		talloc_free(pac_data);
		return ENOMEM;
	}
	nt_status = auth_convert_server_info_saminfo3(LOGON_INFO, server_info, &sam3);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
		talloc_free(pac_data);
		return EINVAL;
	}

	u_LOGON_INFO->logon_info.info		= LOGON_INFO;
	LOGON_INFO->info3 = *sam3;

	ret = krb5_unparse_name_flags(context, client_principal, 
				      KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name);
	if (ret) {
		return ret;
	}
	LOGON_NAME->account_name	= talloc_strdup(LOGON_NAME, name);
	free(name);
	/*
	  this logon_time field is absolutely critical. This is what
	  caused all our PAC troubles :-)
	*/
	unix_to_nt_time(&LOGON_NAME->logon_time, tgs_authtime);

	ret = kerberos_encode_pac(mem_ctx, 
				  iconv_convenience,
				  pac_data, 
				  context,
				  krbtgt_keyblock,
				  service_keyblock,
				  pac);
	talloc_free(pac_data);
	return ret;
}