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e29c74180c
The fact that it currently lives in uefi-capsule is a historical accident, and it doesn't really belong to tpm-eventlog either. Fixes some of https://github.com/fwupd/fwupd/issues/3901
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
/*
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* Copyright (C) 2018 Richard Hughes <richard@hughsie.com>
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*/
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#include "config.h"
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#include "fu-tpm-v1-device.h"
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struct _FuTpmV1Device {
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FuTpmDevice parent_instance;
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};
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G_DEFINE_TYPE(FuTpmV1Device, fu_tpm_v1_device, FU_TYPE_TPM_DEVICE)
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static gboolean
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_g_string_isxdigit(GString *str)
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{
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for (gsize i = 0; i < str->len; i++) {
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if (!g_ascii_isxdigit(str->str[i]))
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return FALSE;
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}
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return TRUE;
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}
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static void
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fu_tpm_device_parse_line(const gchar *line, gpointer user_data)
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{
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FuTpmDevice *self = FU_TPM_DEVICE(user_data);
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guint64 idx;
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g_autofree gchar *idxstr = NULL;
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g_auto(GStrv) split = NULL;
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g_autoptr(GString) str = NULL;
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/* split into index:hash */
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if (line == NULL || line[0] == '\0')
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return;
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split = g_strsplit(line, ":", -1);
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if (g_strv_length(split) != 2) {
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g_debug("unexpected format, skipping: %s", line);
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return;
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}
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/* get index */
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idxstr = fu_common_strstrip(split[0]);
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idx = fu_common_strtoull(idxstr);
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if (idx > 64) {
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g_debug("unexpected index, skipping: %s", idxstr);
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return;
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}
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/* parse hash */
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str = g_string_new(split[1]);
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fu_common_string_replace(str, " ", "");
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if ((str->len != 40 && str->len != 64) || !_g_string_isxdigit(str)) {
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g_debug("not SHA-1 or SHA-256, skipping: %s", split[1]);
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return;
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}
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g_string_ascii_down(str);
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fu_tpm_device_add_checksum(self, idx, str->str);
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}
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static gboolean
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fu_tpm_v1_device_probe(FuDevice *device, GError **error)
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{
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FuTpmV1Device *self = FU_TPM_V1_DEVICE(device);
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g_auto(GStrv) lines = NULL;
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g_autofree gchar *buf_pcrs = NULL;
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/* FuUdevDevice->probe */
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if (!FU_DEVICE_CLASS(fu_tpm_v1_device_parent_class)->probe(device, error))
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return FALSE;
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/* get entire contents */
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if (!g_file_get_contents(fu_udev_device_get_device_file(FU_UDEV_DEVICE(device)),
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&buf_pcrs,
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NULL,
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error))
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return FALSE;
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/* find PCR lines */
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lines = g_strsplit(buf_pcrs, "\n", -1);
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for (guint i = 0; lines[i] != NULL; i++) {
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if (g_str_has_prefix(lines[i], "PCR-"))
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fu_tpm_device_parse_line(lines[i] + 4, self);
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}
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return TRUE;
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}
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static void
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fu_tpm_v1_device_init(FuTpmV1Device *self)
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{
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}
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static void
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fu_tpm_v1_device_class_init(FuTpmV1DeviceClass *klass)
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{
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FuDeviceClass *klass_device = FU_DEVICE_CLASS(klass);
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klass_device->probe = fu_tpm_v1_device_probe;
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}
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FuTpmDevice *
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fu_tpm_v1_device_new(FuContext *ctx)
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{
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return FU_TPM_DEVICE(g_object_new(FU_TYPE_TPM_V1_DEVICE, "context", ctx, NULL));
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}
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