/* * Copyright (C) 2004 IBM Corporation * Authors: * Leendert van Doorn * Dave Safford * Reiner Sailer * Kylene Hall * * Copyright (C) 2013 Obsidian Research Corp * Jason Gunthorpe * * sysfs filesystem inspection interface to the TPM * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. * */ #include #include "tpm.h" #define READ_PUBEK_RESULT_SIZE 314 #define TPM_ORD_READPUBEK cpu_to_be32(124) static struct tpm_input_header tpm_readpubek_header = { .tag = TPM_TAG_RQU_COMMAND, .length = cpu_to_be32(30), .ordinal = TPM_ORD_READPUBEK }; static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, char *buf) { u8 *data; struct tpm_cmd_t tpm_cmd; ssize_t err; int i, rc; char *str = buf; struct tpm_chip *chip = dev_get_drvdata(dev); memset(&tpm_cmd, 0, sizeof(tpm_cmd)); tpm_cmd.header.in = tpm_readpubek_header; err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, 0, "attempting to read the PUBEK"); if (err) goto out; /* ignore header 10 bytes algorithm 32 bits (1 == RSA ) encscheme 16 bits sigscheme 16 bits parameters (RSA 12->bytes: keybit, #primes, expbit) keylenbytes 32 bits 256 byte modulus ignore checksum 20 bytes */ data = tpm_cmd.params.readpubek_out_buffer; str += sprintf(str, "Algorithm: %02X %02X %02X %02X\n" "Encscheme: %02X %02X\n" "Sigscheme: %02X %02X\n" "Parameters: %02X %02X %02X %02X " "%02X %02X %02X %02X " "%02X %02X %02X %02X\n" "Modulus length: %d\n" "Modulus:\n", data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7], data[12], data[13], data[14], data[15], data[16], data[17], data[18], data[19], data[20], data[21], data[22], data[23], be32_to_cpu(*((__be32 *) (data + 24)))); for (i = 0; i < 256; i++) { str += sprintf(str, "%02X ", data[i + 28]); if ((i + 1) % 16 == 0) str += sprintf(str, "\n"); } out: rc = str - buf; return rc; } static DEVICE_ATTR_RO(pubek); static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; u8 digest[TPM_DIGEST_SIZE]; ssize_t rc; int i, j, num_pcrs; char *str = buf; struct tpm_chip *chip = dev_get_drvdata(dev); rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap, "attempting to determine the number of PCRS"); if (rc) return 0; num_pcrs = be32_to_cpu(cap.num_pcrs); for (i = 0; i < num_pcrs; i++) { rc = tpm_pcr_read_dev(chip, i, digest); if (rc) break; str += sprintf(str, "PCR-%02d: ", i); for (j = 0; j < TPM_DIGEST_SIZE; j++) str += sprintf(str, "%02X ", digest[j]); str += sprintf(str, "\n"); } return str - buf; } static DEVICE_ATTR_RO(pcrs); static ssize_t enabled_show(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; ssize_t rc; rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap, "attempting to determine the permanent enabled state"); if (rc) return 0; rc = sprintf(buf, "%d\n", !cap.perm_flags.disable); return rc; } static DEVICE_ATTR_RO(enabled); static ssize_t active_show(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; ssize_t rc; rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap, "attempting to determine the permanent active state"); if (rc) return 0; rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated); return rc; } static DEVICE_ATTR_RO(active); static ssize_t owned_show(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; ssize_t rc; rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap, "attempting to determine the owner state"); if (rc) return 0; rc = sprintf(buf, "%d\n", cap.owned); return rc; } static DEVICE_ATTR_RO(owned); static ssize_t temp_deactivated_show(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; ssize_t rc; rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap, "attempting to determine the temporary state"); if (rc) return 0; rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated); return rc; } static DEVICE_ATTR_RO(temp_deactivated); static ssize_t caps_show(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; ssize_t rc; char *str = buf; rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap, "attempting to determine the manufacturer"); if (rc) return 0; str += sprintf(str, "Manufacturer: 0x%x\n", be32_to_cpu(cap.manufacturer_id)); /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */ rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap, "attempting to determine the 1.2 version"); if (!rc) { str += sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor, cap.tpm_version_1_2.revMajor, cap.tpm_version_1_2.revMinor); } else { /* Otherwise just use TPM_STRUCT_VER */ rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap, "attempting to determine the 1.1 version"); if (rc) return 0; str += sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", cap.tpm_version.Major, cap.tpm_version.Minor, cap.tpm_version.revMajor, cap.tpm_version.revMinor); } return str - buf; } static DEVICE_ATTR_RO(caps); static ssize_t cancel_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct tpm_chip *chip = dev_get_drvdata(dev); if (chip == NULL) return 0; chip->ops->cancel(chip); return count; } static DEVICE_ATTR_WO(cancel); static ssize_t durations_show(struct device *dev, struct device_attribute *attr, char *buf) { struct tpm_chip *chip = dev_get_drvdata(dev); if (chip->vendor.duration[TPM_LONG] == 0) return 0; return sprintf(buf, "%d %d %d [%s]\n", jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]), jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]), jiffies_to_usecs(chip->vendor.duration[TPM_LONG]), chip->vendor.duration_adjusted ? "adjusted" : "original"); } static DEVICE_ATTR_RO(durations); static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr, char *buf) { struct tpm_chip *chip = dev_get_drvdata(dev); return sprintf(buf, "%d %d %d %d [%s]\n", jiffies_to_usecs(chip->vendor.timeout_a), jiffies_to_usecs(chip->vendor.timeout_b), jiffies_to_usecs(chip->vendor.timeout_c), jiffies_to_usecs(chip->vendor.timeout_d), chip->vendor.timeout_adjusted ? "adjusted" : "original"); } static DEVICE_ATTR_RO(timeouts); static struct attribute *tpm_dev_attrs[] = { &dev_attr_pubek.attr, &dev_attr_pcrs.attr, &dev_attr_enabled.attr, &dev_attr_active.attr, &dev_attr_owned.attr, &dev_attr_temp_deactivated.attr, &dev_attr_caps.attr, &dev_attr_cancel.attr, &dev_attr_durations.attr, &dev_attr_timeouts.attr, NULL, }; static const struct attribute_group tpm_dev_group = { .attrs = tpm_dev_attrs, }; int tpm_sysfs_add_device(struct tpm_chip *chip) { int err; /* XXX: If you wish to remove this restriction, you must first update * tpm_sysfs to explicitly lock chip->ops. */ if (chip->flags & TPM_CHIP_FLAG_TPM2) return 0; err = sysfs_create_group(&chip->dev.parent->kobj, &tpm_dev_group); if (err) dev_err(&chip->dev, "failed to create sysfs attributes, %d\n", err); return err; } void tpm_sysfs_del_device(struct tpm_chip *chip) { /* The sysfs routines rely on an implicit tpm_try_get_ops, this * function is called before ops is null'd and the sysfs core * synchronizes this removal so that no callbacks are running or can * run again */ sysfs_remove_group(&chip->dev.parent->kobj, &tpm_dev_group); }