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7084eddf6b
Easily determining what TCG version a tpm device implements has been a pain point for userspace for a long time, so add a sysfs file to report the TCG major version of a tpm device. Also add an entry to Documentation/ABI/stable/sysfs-class-tpm describing the new file. Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Cc: Mimi Zohar <zohar@linux.ibm.com> Cc: Peter Huewe <peterhuewe@gmx.de> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: linux-integrity@vger.kernel.org Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
358 lines
8.5 KiB
C
358 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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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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if (tpm_try_get_ops(chip))
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return 0;
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if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
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goto out_ops;
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tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
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if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
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"attempting to read the PUBEK"))
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goto out_buf;
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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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out_buf:
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tpm_buf_destroy(&tpm_buf);
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out_ops:
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tpm_put_ops(chip);
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return str - buf;
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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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u32 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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if (tpm_try_get_ops(chip))
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return 0;
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if (tpm1_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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tpm_put_ops(chip);
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return 0;
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}
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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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if (tpm1_pcr_read(chip, i, digest)) {
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str = buf;
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break;
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}
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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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tpm_put_ops(chip);
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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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struct tpm_chip *chip = to_tpm_chip(dev);
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ssize_t rc = 0;
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cap_t cap;
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if (tpm_try_get_ops(chip))
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return 0;
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if (tpm1_getcap(chip, 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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goto out_ops;
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rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
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out_ops:
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tpm_put_ops(chip);
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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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struct tpm_chip *chip = to_tpm_chip(dev);
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ssize_t rc = 0;
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cap_t cap;
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if (tpm_try_get_ops(chip))
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return 0;
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if (tpm1_getcap(chip, 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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goto out_ops;
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rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
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out_ops:
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tpm_put_ops(chip);
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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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struct tpm_chip *chip = to_tpm_chip(dev);
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ssize_t rc = 0;
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cap_t cap;
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if (tpm_try_get_ops(chip))
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return 0;
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if (tpm1_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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goto out_ops;
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rc = sprintf(buf, "%d\n", cap.owned);
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out_ops:
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tpm_put_ops(chip);
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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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struct tpm_chip *chip = to_tpm_chip(dev);
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ssize_t rc = 0;
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cap_t cap;
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if (tpm_try_get_ops(chip))
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return 0;
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if (tpm1_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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goto out_ops;
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rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
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out_ops:
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tpm_put_ops(chip);
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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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struct tpm1_version *version;
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ssize_t rc = 0;
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char *str = buf;
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cap_t cap;
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if (tpm_try_get_ops(chip))
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return 0;
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if (tpm1_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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goto out_ops;
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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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/* TPM 1.2 */
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if (!tpm1_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.version2))) {
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version = &cap.version2.version;
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goto out_print;
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}
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/* TPM 1.1 */
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if (tpm1_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.version1))) {
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goto out_ops;
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}
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version = &cap.version1;
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out_print:
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str += sprintf(str,
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"TCG version: %d.%d\nFirmware version: %d.%d\n",
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version->major, version->minor,
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version->rev_major, version->rev_minor);
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rc = str - buf;
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out_ops:
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tpm_put_ops(chip);
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return rc;
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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 (tpm_try_get_ops(chip))
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return 0;
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chip->ops->cancel(chip);
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tpm_put_ops(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 ssize_t tpm_version_major_show(struct device *dev,
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struct device_attribute *attr, 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, "%s\n", chip->flags & TPM_CHIP_FLAG_TPM2
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? "2" : "1");
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}
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static DEVICE_ATTR_RO(tpm_version_major);
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static struct attribute *tpm1_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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&dev_attr_tpm_version_major.attr,
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NULL,
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};
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static struct attribute *tpm2_dev_attrs[] = {
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&dev_attr_tpm_version_major.attr,
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NULL
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};
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static const struct attribute_group tpm1_dev_group = {
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.attrs = tpm1_dev_attrs,
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};
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static const struct attribute_group tpm2_dev_group = {
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.attrs = tpm2_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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WARN_ON(chip->groups_cnt != 0);
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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chip->groups[chip->groups_cnt++] = &tpm2_dev_group;
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else
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chip->groups[chip->groups_cnt++] = &tpm1_dev_group;
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}
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