From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48018) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aLwiw-0007X2-VL for qemu-devel@nongnu.org; Wed, 20 Jan 2016 12:39:16 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aLwiv-0007HO-FS for qemu-devel@nongnu.org; Wed, 20 Jan 2016 12:39:14 -0500 From: "Daniel P. Berrange" Date: Wed, 20 Jan 2016 17:38:44 +0000 Message-Id: <1453311539-1193-3-git-send-email-berrange@redhat.com> In-Reply-To: <1453311539-1193-1-git-send-email-berrange@redhat.com> References: <1453311539-1193-1-git-send-email-berrange@redhat.com> Subject: [Qemu-devel] [PATCH v2 02/17] crypto: add cryptographic random byte source List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , Fam Zheng , qemu-block@nongnu.org There are three backend impls provided. The preferred is gnutls, which is backed by nettle in modern distros. The gcrypt impl is provided for cases where QEMU build against gnutls is disabled, but crypto is still desired. No nettle impl is provided, since it is non-trivial to use the nettle APIs for random numbers. Users of nettle should ensure gnutls is enabled for QEMU. Signed-off-by: Daniel P. Berrange --- Makefile.objs | 2 +- crypto/Makefile.objs | 4 ++++ crypto/random-gcrypt.c | 33 +++++++++++++++++++++++++++++++++ crypto/random-gnutls.c | 43 +++++++++++++++++++++++++++++++++++++++++++ crypto/random-stub.c | 31 +++++++++++++++++++++++++++++++ include/crypto/random.h | 43 +++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 155 insertions(+), 1 deletion(-) create mode 100644 crypto/random-gcrypt.c create mode 100644 crypto/random-gnutls.c create mode 100644 crypto/random-stub.c create mode 100644 include/crypto/random.h diff --git a/Makefile.objs b/Makefile.objs index 06b95c7..8b52f33 100644 --- a/Makefile.objs +++ b/Makefile.objs @@ -1,6 +1,6 @@ ####################################################################### # Common libraries for tools and emulators -stub-obj-y = stubs/ +stub-obj-y = stubs/ crypto/ util-obj-y = util/ qobject/ qapi/ util-obj-y += qmp-introspect.o qapi-types.o qapi-visit.o qapi-event.o diff --git a/crypto/Makefile.objs b/crypto/Makefile.objs index a3135f1..1802ff5 100644 --- a/crypto/Makefile.objs +++ b/crypto/Makefile.objs @@ -8,6 +8,10 @@ crypto-obj-y += tlscredsanon.o crypto-obj-y += tlscredsx509.o crypto-obj-y += tlssession.o crypto-obj-y += secret.o +crypto-obj-$(if $(CONFIG_GNUTLS),n,$(CONFIG_GCRYPT)) += random-gcrypt.o +crypto-obj-$(CONFIG_GNUTLS) += random-gnutls.o # Let the userspace emulators avoid linking gnutls/etc crypto-aes-obj-y = aes.o + +stub-obj-y += random-stub.o \ No newline at end of file diff --git a/crypto/random-gcrypt.c b/crypto/random-gcrypt.c new file mode 100644 index 0000000..a2d77db --- /dev/null +++ b/crypto/random-gcrypt.c @@ -0,0 +1,33 @@ +/* + * QEMU Crypto random number provider + * + * Copyright (c) 2015-2016 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + * + */ + +#include + +#include "crypto/random.h" + +#include + +int qcrypto_random_bytes(uint8_t *buf, + size_t buflen, + Error **errp G_GNUC_UNUSED) +{ + gcry_randomize(buf, buflen, GCRY_STRONG_RANDOM); + return 0; +} diff --git a/crypto/random-gnutls.c b/crypto/random-gnutls.c new file mode 100644 index 0000000..f45c295 --- /dev/null +++ b/crypto/random-gnutls.c @@ -0,0 +1,43 @@ +/* + * QEMU Crypto random number provider + * + * Copyright (c) 2015-2016 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + * + */ + +#include + +#include "crypto/random.h" + +#include +#include + +int qcrypto_random_bytes(uint8_t *buf, + size_t buflen, + Error **errp) +{ + int ret; + + ret = gnutls_rnd(GNUTLS_RND_RANDOM, buf, buflen); + + if (ret < 0) { + error_setg(errp, "Cannot get random bytes: %s", + gnutls_strerror(ret)); + return -1; + } + + return 0; +} diff --git a/crypto/random-stub.c b/crypto/random-stub.c new file mode 100644 index 0000000..5c2a4e1 --- /dev/null +++ b/crypto/random-stub.c @@ -0,0 +1,31 @@ +/* + * QEMU Crypto random number provider + * + * Copyright (c) 2015-2016 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + * + */ + +#include + +#include "crypto/random.h" + +int qcrypto_random_bytes(uint8_t *buf G_GNUC_UNUSED, + size_t buflen G_GNUC_UNUSED, + Error **errp) +{ + error_setg(errp, "No random byte source provided in this build"); + return -1; +} diff --git a/include/crypto/random.h b/include/crypto/random.h new file mode 100644 index 0000000..743f5a0 --- /dev/null +++ b/include/crypto/random.h @@ -0,0 +1,43 @@ +/* + * QEMU Crypto random number provider + * + * Copyright (c) 2015-2016 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + * + */ + +#ifndef QCRYPTO_RANDOM_H__ +#define QCRYPTO_RANDOM_H__ + +#include "qemu-common.h" +#include "qapi/error.h" + + +/** + * qcrypto_random_bytes: + * @buf: the buffer to fill + * @buflen: length of @buf in bytes + * @errp: pointer to a NULL-initialized error object + * + * Fill @buf with @buflen bytes of random data + * + * Returns 0 on sucess, -1 on error + */ +int qcrypto_random_bytes(uint8_t *buf, + size_t buflen, + Error **errp); + + +#endif /* QCRYPTO_RANDOM_H__ */ -- 2.5.0