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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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