320 lines
8.2 KiB
C
320 lines
8.2 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Copyright (C) 2013 Obsidian Research Corp
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* Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
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*
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* sysfs filesystem inspection interface to the TPM
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#include <linux/device.h>
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#include "tpm.h"
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struct tpm_readpubek_out {
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u8 algorithm[4];
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u8 encscheme[2];
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u8 sigscheme[2];
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__be32 paramsize;
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u8 parameters[12];
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__be32 keysize;
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u8 modulus[256];
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u8 checksum[20];
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} __packed;
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#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
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#define TPM_ORD_READPUBEK 124
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static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tpm_buf tpm_buf;
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struct tpm_readpubek_out *out;
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ssize_t rc;
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int i;
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char *str = buf;
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struct tpm_chip *chip = to_tpm_chip(dev);
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char anti_replay[20];
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memset(&anti_replay, 0, sizeof(anti_replay));
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rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);
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if (rc)
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return rc;
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tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
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rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE,
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READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
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"attempting to read the PUBEK");
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if (rc) {
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tpm_buf_destroy(&tpm_buf);
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return 0;
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}
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out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
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str +=
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sprintf(str,
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"Algorithm: %02X %02X %02X %02X\n"
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"Encscheme: %02X %02X\n"
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"Sigscheme: %02X %02X\n"
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"Parameters: %02X %02X %02X %02X "
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"%02X %02X %02X %02X "
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"%02X %02X %02X %02X\n"
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"Modulus length: %d\n"
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"Modulus:\n",
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out->algorithm[0], out->algorithm[1], out->algorithm[2],
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out->algorithm[3],
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out->encscheme[0], out->encscheme[1],
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out->sigscheme[0], out->sigscheme[1],
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out->parameters[0], out->parameters[1],
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out->parameters[2], out->parameters[3],
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out->parameters[4], out->parameters[5],
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out->parameters[6], out->parameters[7],
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out->parameters[8], out->parameters[9],
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out->parameters[10], out->parameters[11],
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be32_to_cpu(out->keysize));
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for (i = 0; i < 256; i++) {
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str += sprintf(str, "%02X ", out->modulus[i]);
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if ((i + 1) % 16 == 0)
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str += sprintf(str, "\n");
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}
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rc = str - buf;
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tpm_buf_destroy(&tpm_buf);
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return rc;
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}
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static DEVICE_ATTR_RO(pubek);
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static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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cap_t cap;
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u8 digest[TPM_DIGEST_SIZE];
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ssize_t rc;
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int i, j, num_pcrs;
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char *str = buf;
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struct tpm_chip *chip = to_tpm_chip(dev);
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rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap,
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"attempting to determine the number of PCRS",
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sizeof(cap.num_pcrs));
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if (rc)
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return 0;
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num_pcrs = be32_to_cpu(cap.num_pcrs);
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for (i = 0; i < num_pcrs; i++) {
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rc = tpm_pcr_read_dev(chip, i, digest);
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if (rc)
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break;
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str += sprintf(str, "PCR-%02d: ", i);
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for (j = 0; j < TPM_DIGEST_SIZE; j++)
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str += sprintf(str, "%02X ", digest[j]);
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str += sprintf(str, "\n");
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}
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return str - buf;
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}
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static DEVICE_ATTR_RO(pcrs);
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static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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cap_t cap;
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ssize_t rc;
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rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
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"attempting to determine the permanent enabled state",
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sizeof(cap.perm_flags));
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if (rc)
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return 0;
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rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
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return rc;
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}
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static DEVICE_ATTR_RO(enabled);
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static ssize_t active_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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cap_t cap;
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ssize_t rc;
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rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
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"attempting to determine the permanent active state",
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sizeof(cap.perm_flags));
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if (rc)
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return 0;
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rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
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return rc;
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}
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static DEVICE_ATTR_RO(active);
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static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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cap_t cap;
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ssize_t rc;
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rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
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"attempting to determine the owner state",
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sizeof(cap.owned));
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if (rc)
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return 0;
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rc = sprintf(buf, "%d\n", cap.owned);
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return rc;
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}
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static DEVICE_ATTR_RO(owned);
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static ssize_t temp_deactivated_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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cap_t cap;
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ssize_t rc;
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rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
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"attempting to determine the temporary state",
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sizeof(cap.stclear_flags));
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if (rc)
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return 0;
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rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
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return rc;
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}
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static DEVICE_ATTR_RO(temp_deactivated);
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static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tpm_chip *chip = to_tpm_chip(dev);
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cap_t cap;
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ssize_t rc;
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char *str = buf;
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rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
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"attempting to determine the manufacturer",
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sizeof(cap.manufacturer_id));
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if (rc)
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return 0;
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str += sprintf(str, "Manufacturer: 0x%x\n",
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be32_to_cpu(cap.manufacturer_id));
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/* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
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rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
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"attempting to determine the 1.2 version",
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sizeof(cap.tpm_version_1_2));
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if (!rc) {
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str += sprintf(str,
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"TCG version: %d.%d\nFirmware version: %d.%d\n",
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cap.tpm_version_1_2.Major,
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cap.tpm_version_1_2.Minor,
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cap.tpm_version_1_2.revMajor,
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cap.tpm_version_1_2.revMinor);
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} else {
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/* Otherwise just use TPM_STRUCT_VER */
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rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
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"attempting to determine the 1.1 version",
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sizeof(cap.tpm_version));
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if (rc)
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return 0;
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str += sprintf(str,
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"TCG version: %d.%d\nFirmware version: %d.%d\n",
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cap.tpm_version.Major,
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cap.tpm_version.Minor,
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cap.tpm_version.revMajor,
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cap.tpm_version.revMinor);
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}
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return str - buf;
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}
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static DEVICE_ATTR_RO(caps);
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static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct tpm_chip *chip = to_tpm_chip(dev);
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if (chip == NULL)
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return 0;
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chip->ops->cancel(chip);
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return count;
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}
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static DEVICE_ATTR_WO(cancel);
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static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tpm_chip *chip = to_tpm_chip(dev);
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if (chip->duration[TPM_LONG] == 0)
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return 0;
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return sprintf(buf, "%d %d %d [%s]\n",
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jiffies_to_usecs(chip->duration[TPM_SHORT]),
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jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
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jiffies_to_usecs(chip->duration[TPM_LONG]),
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chip->duration_adjusted
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? "adjusted" : "original");
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}
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static DEVICE_ATTR_RO(durations);
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static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tpm_chip *chip = to_tpm_chip(dev);
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return sprintf(buf, "%d %d %d %d [%s]\n",
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jiffies_to_usecs(chip->timeout_a),
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jiffies_to_usecs(chip->timeout_b),
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jiffies_to_usecs(chip->timeout_c),
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jiffies_to_usecs(chip->timeout_d),
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chip->timeout_adjusted
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? "adjusted" : "original");
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}
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static DEVICE_ATTR_RO(timeouts);
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static struct attribute *tpm_dev_attrs[] = {
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&dev_attr_pubek.attr,
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&dev_attr_pcrs.attr,
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&dev_attr_enabled.attr,
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&dev_attr_active.attr,
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&dev_attr_owned.attr,
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&dev_attr_temp_deactivated.attr,
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&dev_attr_caps.attr,
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&dev_attr_cancel.attr,
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&dev_attr_durations.attr,
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&dev_attr_timeouts.attr,
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NULL,
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};
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static const struct attribute_group tpm_dev_group = {
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.attrs = tpm_dev_attrs,
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};
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void tpm_sysfs_add_device(struct tpm_chip *chip)
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{
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/* XXX: If you wish to remove this restriction, you must first update
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* tpm_sysfs to explicitly lock chip->ops.
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*/
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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return;
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/* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
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* is called before ops is null'd and the sysfs core synchronizes this
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* removal so that no callbacks are running or can run again
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*/
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WARN_ON(chip->groups_cnt != 0);
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chip->groups[chip->groups_cnt++] = &tpm_dev_group;
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}
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