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[src-draft/trunk]: src/sys/stand/efiboot Draft logic to get at EFI RNG.
details: https://anonhg.NetBSD.org/src-all/rev/e6085e29ece7
branches: trunk
changeset: 932722:e6085e29ece7
user: Taylor R Campbell <riastradh%NetBSD.org@localhost>
date: Mon May 11 02:10:19 2020 +0000
description:
Draft logic to get at EFI RNG.
diffstat:
sys/stand/efiboot/Makefile.efiboot | 2 +-
sys/stand/efiboot/boot.c | 2 +
sys/stand/efiboot/efiacpi.c | 2 +-
sys/stand/efiboot/efirng.c | 136 +++++++++++++++++++++++++++++++++++++
sys/stand/efiboot/efirng.h | 39 ++++++++++
5 files changed, 179 insertions(+), 2 deletions(-)
diffs (226 lines):
diff -r 7c2955054758 -r e6085e29ece7 sys/stand/efiboot/Makefile.efiboot
--- a/sys/stand/efiboot/Makefile.efiboot Thu May 14 09:47:25 2020 +0000
+++ b/sys/stand/efiboot/Makefile.efiboot Mon May 11 02:10:19 2020 +0000
@@ -22,7 +22,7 @@
.PATH: ${EFIDIR}/gnuefi
SOURCES= crt0-efi-${GNUEFIARCH}.S reloc_${GNUEFIARCH}.c
SOURCES+= boot.c conf.c console.c dev_net.c devopen.c exec.c panic.c prompt.c
-SOURCES+= efiboot.c efichar.c efidev.c efienv.c efigetsecs.c efifdt.c efifile.c efiblock.c efinet.c efipxe.c efiacpi.c smbios.c
+SOURCES+= efiboot.c efichar.c efidev.c efienv.c efigetsecs.c efifdt.c efifile.c efiblock.c efinet.c efipxe.c efiacpi.c efirng.c smbios.c
.PATH: ${S}/external/bsd/libfdt/dist
CPPFLAGS+= -I${S}/external/bsd/libfdt/dist
diff -r 7c2955054758 -r e6085e29ece7 sys/stand/efiboot/boot.c
--- a/sys/stand/efiboot/boot.c Thu May 14 09:47:25 2020 +0000
+++ b/sys/stand/efiboot/boot.c Mon May 11 02:10:19 2020 +0000
@@ -32,6 +32,7 @@
#include "efifdt.h"
#include "efiacpi.h"
#include "efienv.h"
+#include "efirng.h"
#include <sys/bootblock.h>
#include <sys/boot_flag.h>
@@ -285,6 +286,7 @@
efi_fdt_show();
efi_acpi_show();
+ efi_rng_show();
}
void
diff -r 7c2955054758 -r e6085e29ece7 sys/stand/efiboot/efiacpi.c
--- a/sys/stand/efiboot/efiacpi.c Thu May 14 09:47:25 2020 +0000
+++ b/sys/stand/efiboot/efiacpi.c Mon May 11 02:10:19 2020 +0000
@@ -124,7 +124,7 @@
rsdp->oemid[3], rsdp->oemid[4], rsdp->oemid[5]);
if (smbios3_table)
- printf("SMBIOS: %s", efi_acpi_get_model());
+ printf("SMBIOS: %s\n", efi_acpi_get_model());
}
int
diff -r 7c2955054758 -r e6085e29ece7 sys/stand/efiboot/efirng.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/stand/efiboot/efirng.c Mon May 11 02:10:19 2020 +0000
@@ -0,0 +1,136 @@
+/* $NetBSD$ */
+
+/*-
+ * Copyright (c) 2020 The NetBSD Foundation, Inc.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 THE FOUNDATION 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.
+ */
+
+/*
+ * UEFI Forum, Inc.: UEFI Specification, Version 2.8 Errata A, February
+ * 2020, Sec. 37.5 EFI Random Number Generator Protocol, pp. 2158--2162
+ * https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_A_Feb14.pdf
+ */
+
+#include "efirng.h"
+
+#include "efiboot.h"
+
+static EFI_GUID RngProtocolGuid = EFI_RNG_PROTOCOL_GUID;
+static EFI_GUID RngAlgorithmRawGuid = EFI_RNG_ALGORITHM_RAW;
+static EFI_RNG_PROTOCOL *rng;
+
+#ifndef EFIBOOT_DEBUG
+#define DPRINT(...) __nothing
+#else
+#define DPRINT Print
+#endif
+
+static const struct {
+ EFI_GUID guid;
+ const CHAR16 *name;
+} algname[] = {
+ {EFI_RNG_ALGORITHM_SP800_90_HASH_256_GUID,
+ L"NIST SP800-90 Hash_DRBG SHA-256"},
+ {EFI_RNG_ALGORITHM_SP800_90_HMAC_256_GUID,
+ L"NIST SP800-90 HMAC_DRBG SHA-256"},
+ {EFI_RNG_ALGORITHM_SP800_90_CTR_256_GUID,
+ L"NIST SP800-90 CTR_DRBG AES-256"},
+ {EFI_RNG_ALGORITHM_X9_31_3DES_GUID, L"ANSI X9.31 3DES"},
+ {EFI_RNG_ALGORITHM_X9_31_AES_GUID, L"ANSI X9.31 AES"},
+ {EFI_RNG_ALGORITHM_RAW, L"raw"},
+};
+
+void
+efi_rng_probe(void)
+{
+ EFI_STATUS status;
+
+ /* Get the RNG protocol. */
+ status = LibLocateProtocol(&RngProtocolGuid, (void **)&rng);
+ if (EFI_ERROR(status)) {
+ DPRINT(L"efirng: protocol: %r\n", status);
+ rng = NULL;
+ return;
+ }
+}
+
+void
+efi_rng_show(void)
+{
+ EFI_RNG_ALGORITHM alglist[10];
+ UINTN i, j, alglistsz = sizeof alglist;
+ EFI_STATUS status;
+
+ /* Query the list of supported algorithms. */
+ status = uefi_call_wrapper(rng->GetInfo, 3, rng, &alglistsz, alglist);
+ if (EFI_ERROR(status)) {
+ Print(L"efirng: GetInfo: %r\n", status);
+ return;
+ }
+
+ /* Print the list of supported algorithms. */
+ for (i = 0; i < alglistsz/sizeof(alglist[0]); i++) {
+ const CHAR16 *name = L"[unknown]";
+ for (j = 0; j < __arraycount(algname); j++) {
+ if (memcmp(&alglist[i], &algname[j].guid,
+ sizeof(EFI_GUID)) == 0) {
+ name = algname[j].name;
+ break;
+ }
+ }
+ Print(L"RNG: %s (%g)\n", name, &alglist[i]);
+ }
+}
+
+int
+efi_rng_available(void)
+{
+
+ return rng != NULL;
+}
+
+int
+efi_rng(void *buf, UINTN len)
+{
+ EFI_STATUS status;
+
+ if (rng == NULL)
+ return EIO;
+
+ status = uefi_call_wrapper(rng->GetRNG, 3, rng, &RngAlgorithmRawGuid,
+ len, buf);
+ if (status == EFI_UNSUPPORTED) {
+ /*
+ * Fall back to any supported RNG `algorithm' even
+ * though we would prefer raw samples.
+ */
+ status = uefi_call_wrapper(rng->GetRNG, 3, rng, NULL, len, buf);
+ }
+ if (EFI_ERROR(status)) {
+ DPRINT(L"efirng: GetRNG: %r\n", status);
+ return EIO;
+ }
+
+ return 0;
+}
diff -r 7c2955054758 -r e6085e29ece7 sys/stand/efiboot/efirng.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/stand/efiboot/efirng.h Mon May 11 02:10:19 2020 +0000
@@ -0,0 +1,39 @@
+/* $NetBSD$ */
+
+/*-
+ * Copyright (c) 2020 The NetBSD Foundation, Inc.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 THE FOUNDATION 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.
+ */
+
+#ifndef EFIBOOT_EFIRNG_H
+#define EFIBOOT_EFIRNG_H
+
+#include <efi.h>
+
+void efi_rng_probe(void);
+void efi_rng_show(void);
+int efi_rng_available(void);
+int efi_rng(void *, UINTN);
+
+#endif /* EFIBOOT_EFIRNG_H */
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