318 lines
7.9 KiB
C
318 lines
7.9 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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/* XXX for now this helper is duplicated in tpm-interface.c */
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static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
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int len, const char *desc)
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{
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int err;
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len = tpm_transmit(chip, (u8 *) cmd, len);
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if (len < 0)
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return len;
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else if (len < TPM_HEADER_SIZE)
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return -EFAULT;
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err = be32_to_cpu(cmd->header.out.return_code);
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if (err != 0 && desc)
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dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
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return err;
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}
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#define READ_PUBEK_RESULT_SIZE 314
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#define TPM_ORD_READPUBEK cpu_to_be32(124)
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static struct tpm_input_header tpm_readpubek_header = {
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.tag = TPM_TAG_RQU_COMMAND,
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.length = cpu_to_be32(30),
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.ordinal = TPM_ORD_READPUBEK
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};
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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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u8 *data;
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struct tpm_cmd_t tpm_cmd;
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ssize_t err;
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int i, rc;
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char *str = buf;
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struct tpm_chip *chip = dev_get_drvdata(dev);
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tpm_cmd.header.in = tpm_readpubek_header;
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err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
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"attempting to read the PUBEK");
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if (err)
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goto out;
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/*
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ignore header 10 bytes
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algorithm 32 bits (1 == RSA )
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encscheme 16 bits
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sigscheme 16 bits
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parameters (RSA 12->bytes: keybit, #primes, expbit)
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keylenbytes 32 bits
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256 byte modulus
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ignore checksum 20 bytes
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*/
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data = tpm_cmd.params.readpubek_out_buffer;
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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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data[0], data[1], data[2], data[3],
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data[4], data[5],
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data[6], data[7],
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data[12], data[13], data[14], data[15],
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data[16], data[17], data[18], data[19],
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data[20], data[21], data[22], data[23],
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be32_to_cpu(*((__be32 *) (data + 24))));
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for (i = 0; i < 256; i++) {
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str += sprintf(str, "%02X ", data[i + 28]);
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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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out:
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rc = str - 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 = dev_get_drvdata(dev);
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rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
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"attempting to determine the number of 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(dev, TPM_CAP_FLAG_PERM, &cap,
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"attempting to determine the permanent enabled state");
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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(dev, TPM_CAP_FLAG_PERM, &cap,
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"attempting to determine the permanent active state");
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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(dev, TPM_CAP_PROP_OWNER, &cap,
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"attempting to determine the owner state");
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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(dev, TPM_CAP_FLAG_VOL, &cap,
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"attempting to determine the temporary state");
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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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cap_t cap;
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ssize_t rc;
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char *str = buf;
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rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
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"attempting to determine the manufacturer");
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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(dev, CAP_VERSION_1_2, &cap,
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"attempting to determine the 1.2 version");
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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(dev, CAP_VERSION_1_1, &cap,
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"attempting to determine the 1.1 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 = dev_get_drvdata(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 = dev_get_drvdata(dev);
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if (chip->vendor.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->vendor.duration[TPM_SHORT]),
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jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
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jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
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chip->vendor.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 = dev_get_drvdata(dev);
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return sprintf(buf, "%d %d %d %d [%s]\n",
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jiffies_to_usecs(chip->vendor.timeout_a),
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jiffies_to_usecs(chip->vendor.timeout_b),
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jiffies_to_usecs(chip->vendor.timeout_c),
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jiffies_to_usecs(chip->vendor.timeout_d),
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chip->vendor.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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int tpm_sysfs_add_device(struct tpm_chip *chip)
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{
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int err;
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err = sysfs_create_group(&chip->dev->kobj,
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&tpm_dev_group);
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if (err)
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dev_err(chip->dev,
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"failed to create sysfs attributes, %d\n", err);
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return err;
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}
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void tpm_sysfs_del_device(struct tpm_chip *chip)
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{
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sysfs_remove_group(&chip->dev->kobj, &tpm_dev_group);
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}
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