/* * 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" struct tpm_readpubek_out { u8 algorithm[4]; u8 encscheme[2]; u8 sigscheme[2]; __be32 paramsize; u8 parameters[12]; __be32 keysize; u8 modulus[256]; u8 checksum[20]; } __packed; #define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256) #define TPM_ORD_READPUBEK 124 static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, char *buf) { struct tpm_buf tpm_buf; struct tpm_readpubek_out *out; ssize_t rc; int i; char *str = buf; struct tpm_chip *chip = to_tpm_chip(dev); char anti_replay[20]; memset(&anti_replay, 0, sizeof(anti_replay)); rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK); if (rc) return rc; tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay)); rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE, READ_PUBEK_RESULT_MIN_BODY_SIZE, 0, "attempting to read the PUBEK"); if (rc) { tpm_buf_destroy(&tpm_buf); return 0; } out = (struct tpm_readpubek_out *)&tpm_buf.data[10]; 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", out->algorithm[0], out->algorithm[1], out->algorithm[2], out->algorithm[3], out->encscheme[0], out->encscheme[1], out->sigscheme[0], out->sigscheme[1], out->parameters[0], out->parameters[1], out->parameters[2], out->parameters[3], out->parameters[4], out->parameters[5], out->parameters[6], out->parameters[7], out->parameters[8], out->parameters[9], out->parameters[10], out->parameters[11], be32_to_cpu(out->keysize)); for (i = 0; i < 256; i++) { str += sprintf(str, "%02X ", out->modulus[i]); if ((i + 1) % 16 == 0) str += sprintf(str, "\n"); } rc = str - buf; tpm_buf_destroy(&tpm_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 = to_tpm_chip(dev); rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap, "attempting to determine the number of PCRS", sizeof(cap.num_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(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap, "attempting to determine the permanent enabled state", sizeof(cap.perm_flags)); 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(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap, "attempting to determine the permanent active state", sizeof(cap.perm_flags)); 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(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap, "attempting to determine the owner state", sizeof(cap.owned)); 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(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap, "attempting to determine the temporary state", sizeof(cap.stclear_flags)); 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) { struct tpm_chip *chip = to_tpm_chip(dev); cap_t cap; ssize_t rc; char *str = buf; rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap, "attempting to determine the manufacturer", sizeof(cap.manufacturer_id)); 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(chip, TPM_CAP_VERSION_1_2, &cap, "attempting to determine the 1.2 version", sizeof(cap.tpm_version_1_2)); 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(chip, TPM_CAP_VERSION_1_1, &cap, "attempting to determine the 1.1 version", sizeof(cap.tpm_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 = to_tpm_chip(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 = to_tpm_chip(dev); if (chip->duration[TPM_LONG] == 0) return 0; return sprintf(buf, "%d %d %d [%s]\n", jiffies_to_usecs(chip->duration[TPM_SHORT]), jiffies_to_usecs(chip->duration[TPM_MEDIUM]), jiffies_to_usecs(chip->duration[TPM_LONG]), chip->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 = to_tpm_chip(dev); return sprintf(buf, "%d %d %d %d [%s]\n", jiffies_to_usecs(chip->timeout_a), jiffies_to_usecs(chip->timeout_b), jiffies_to_usecs(chip->timeout_c), jiffies_to_usecs(chip->timeout_d), chip->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, }; void tpm_sysfs_add_device(struct tpm_chip *chip) { /* 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; /* The sysfs routines rely on an implicit tpm_try_get_ops, device_del * is called before ops is null'd and the sysfs core synchronizes this * removal so that no callbacks are running or can run again */ WARN_ON(chip->groups_cnt != 0); chip->groups[chip->groups_cnt++] = &tpm_dev_group; }