summaryrefslogtreecommitdiffstats
path: root/drivers/char/tpm/tpm-sysfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char/tpm/tpm-sysfs.c')
-rw-r--r--drivers/char/tpm/tpm-sysfs.c529
1 files changed, 529 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
new file mode 100644
index 0000000000..54c71473aa
--- /dev/null
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -0,0 +1,529 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2004 IBM Corporation
+ * Authors:
+ * Leendert van Doorn <leendert@watson.ibm.com>
+ * Dave Safford <safford@watson.ibm.com>
+ * Reiner Sailer <sailer@watson.ibm.com>
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * Copyright (C) 2013 Obsidian Research Corp
+ * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
+ *
+ * sysfs filesystem inspection interface to the TPM
+ */
+#include <linux/device.h>
+#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;
+ int i;
+ char *str = buf;
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ char anti_replay[20];
+
+ memset(&anti_replay, 0, sizeof(anti_replay));
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
+ goto out_ops;
+
+ tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
+
+ if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
+ "attempting to read the PUBEK"))
+ goto out_buf;
+
+ out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
+ str +=
+ sprintf(str,
+ "Algorithm: %4ph\n"
+ "Encscheme: %2ph\n"
+ "Sigscheme: %2ph\n"
+ "Parameters: %12ph\n"
+ "Modulus length: %d\n"
+ "Modulus:\n",
+ out->algorithm,
+ out->encscheme,
+ out->sigscheme,
+ out->parameters,
+ be32_to_cpu(out->keysize));
+
+ for (i = 0; i < 256; i += 16)
+ str += sprintf(str, "%16ph\n", &out->modulus[i]);
+
+out_buf:
+ tpm_buf_destroy(&tpm_buf);
+out_ops:
+ tpm_put_ops(chip);
+ return str - buf;
+}
+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];
+ u32 i, j, num_pcrs;
+ char *str = buf;
+ struct tpm_chip *chip = to_tpm_chip(dev);
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
+ "attempting to determine the number of PCRS",
+ sizeof(cap.num_pcrs))) {
+ tpm_put_ops(chip);
+ return 0;
+ }
+
+ num_pcrs = be32_to_cpu(cap.num_pcrs);
+ for (i = 0; i < num_pcrs; i++) {
+ if (tpm1_pcr_read(chip, i, digest)) {
+ str = buf;
+ 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");
+ }
+ tpm_put_ops(chip);
+ return str - buf;
+}
+static DEVICE_ATTR_RO(pcrs);
+
+static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ ssize_t rc = 0;
+ cap_t cap;
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
+ "attempting to determine the permanent enabled state",
+ sizeof(cap.perm_flags)))
+ goto out_ops;
+
+ rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
+out_ops:
+ tpm_put_ops(chip);
+ return rc;
+}
+static DEVICE_ATTR_RO(enabled);
+
+static ssize_t active_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ ssize_t rc = 0;
+ cap_t cap;
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
+ "attempting to determine the permanent active state",
+ sizeof(cap.perm_flags)))
+ goto out_ops;
+
+ rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
+out_ops:
+ tpm_put_ops(chip);
+ return rc;
+}
+static DEVICE_ATTR_RO(active);
+
+static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ ssize_t rc = 0;
+ cap_t cap;
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
+ "attempting to determine the owner state",
+ sizeof(cap.owned)))
+ goto out_ops;
+
+ rc = sprintf(buf, "%d\n", cap.owned);
+out_ops:
+ tpm_put_ops(chip);
+ return rc;
+}
+static DEVICE_ATTR_RO(owned);
+
+static ssize_t temp_deactivated_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ ssize_t rc = 0;
+ cap_t cap;
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
+ "attempting to determine the temporary state",
+ sizeof(cap.stclear_flags)))
+ goto out_ops;
+
+ rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
+out_ops:
+ tpm_put_ops(chip);
+ 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);
+ struct tpm1_version *version;
+ ssize_t rc = 0;
+ char *str = buf;
+ cap_t cap;
+
+ if (tpm_try_get_ops(chip))
+ return 0;
+
+ if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
+ "attempting to determine the manufacturer",
+ sizeof(cap.manufacturer_id)))
+ goto out_ops;
+
+ str += sprintf(str, "Manufacturer: 0x%x\n",
+ be32_to_cpu(cap.manufacturer_id));
+
+ /* TPM 1.2 */
+ if (!tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
+ "attempting to determine the 1.2 version",
+ sizeof(cap.version2))) {
+ version = &cap.version2.version;
+ goto out_print;
+ }
+
+ /* TPM 1.1 */
+ if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
+ "attempting to determine the 1.1 version",
+ sizeof(cap.version1))) {
+ goto out_ops;
+ }
+
+ version = &cap.version1;
+
+out_print:
+ str += sprintf(str,
+ "TCG version: %d.%d\nFirmware version: %d.%d\n",
+ version->major, version->minor,
+ version->rev_major, version->rev_minor);
+
+ rc = str - buf;
+
+out_ops:
+ tpm_put_ops(chip);
+ return rc;
+}
+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 (tpm_try_get_ops(chip))
+ return 0;
+
+ chip->ops->cancel(chip);
+ tpm_put_ops(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 ssize_t tpm_version_major_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct tpm_chip *chip = to_tpm_chip(dev);
+
+ return sprintf(buf, "%s\n", chip->flags & TPM_CHIP_FLAG_TPM2
+ ? "2" : "1");
+}
+static DEVICE_ATTR_RO(tpm_version_major);
+
+static struct attribute *tpm1_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,
+ &dev_attr_tpm_version_major.attr,
+ NULL,
+};
+
+static struct attribute *tpm2_dev_attrs[] = {
+ &dev_attr_tpm_version_major.attr,
+ NULL
+};
+
+static const struct attribute_group tpm1_dev_group = {
+ .attrs = tpm1_dev_attrs,
+};
+
+static const struct attribute_group tpm2_dev_group = {
+ .attrs = tpm2_dev_attrs,
+};
+
+struct tpm_pcr_attr {
+ int alg_id;
+ int pcr;
+ struct device_attribute attr;
+};
+
+#define to_tpm_pcr_attr(a) container_of(a, struct tpm_pcr_attr, attr)
+
+static ssize_t pcr_value_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_pcr_attr *ha = to_tpm_pcr_attr(attr);
+ struct tpm_chip *chip = to_tpm_chip(dev);
+ struct tpm_digest digest;
+ int i;
+ int digest_size = 0;
+ int rc;
+ char *str = buf;
+
+ for (i = 0; i < chip->nr_allocated_banks; i++)
+ if (ha->alg_id == chip->allocated_banks[i].alg_id)
+ digest_size = chip->allocated_banks[i].digest_size;
+ /* should never happen */
+ if (!digest_size)
+ return -EINVAL;
+
+ digest.alg_id = ha->alg_id;
+ rc = tpm_pcr_read(chip, ha->pcr, &digest);
+ if (rc)
+ return rc;
+ for (i = 0; i < digest_size; i++)
+ str += sprintf(str, "%02X", digest.digest[i]);
+ str += sprintf(str, "\n");
+
+ return str - buf;
+}
+
+/*
+ * The following set of defines represents all the magic to build
+ * the per hash attribute groups for displaying each bank of PCRs.
+ * The only slight problem with this approach is that every PCR is
+ * hard coded to be present, so you don't know if an PCR is missing
+ * until a cat of the file returns -EINVAL
+ *
+ * Also note you must ignore checkpatch warnings in this macro
+ * code. This is deep macro magic that checkpatch.pl doesn't
+ * understand.
+ */
+
+/* Note, this must match TPM2_PLATFORM_PCR which is fixed at 24. */
+#define _TPM_HELPER(_alg, _hash, F) \
+ F(_alg, _hash, 0) \
+ F(_alg, _hash, 1) \
+ F(_alg, _hash, 2) \
+ F(_alg, _hash, 3) \
+ F(_alg, _hash, 4) \
+ F(_alg, _hash, 5) \
+ F(_alg, _hash, 6) \
+ F(_alg, _hash, 7) \
+ F(_alg, _hash, 8) \
+ F(_alg, _hash, 9) \
+ F(_alg, _hash, 10) \
+ F(_alg, _hash, 11) \
+ F(_alg, _hash, 12) \
+ F(_alg, _hash, 13) \
+ F(_alg, _hash, 14) \
+ F(_alg, _hash, 15) \
+ F(_alg, _hash, 16) \
+ F(_alg, _hash, 17) \
+ F(_alg, _hash, 18) \
+ F(_alg, _hash, 19) \
+ F(_alg, _hash, 20) \
+ F(_alg, _hash, 21) \
+ F(_alg, _hash, 22) \
+ F(_alg, _hash, 23)
+
+/* ignore checkpatch warning about trailing ; in macro. */
+#define PCR_ATTR(_alg, _hash, _pcr) \
+ static struct tpm_pcr_attr dev_attr_pcr_##_hash##_##_pcr = { \
+ .alg_id = _alg, \
+ .pcr = _pcr, \
+ .attr = { \
+ .attr = { \
+ .name = __stringify(_pcr), \
+ .mode = 0444 \
+ }, \
+ .show = pcr_value_show \
+ } \
+ };
+
+#define PCR_ATTRS(_alg, _hash) \
+ _TPM_HELPER(_alg, _hash, PCR_ATTR)
+
+/* ignore checkpatch warning about trailing , in macro. */
+#define PCR_ATTR_VAL(_alg, _hash, _pcr) \
+ &dev_attr_pcr_##_hash##_##_pcr.attr.attr,
+
+#define PCR_ATTR_GROUP_ARRAY(_alg, _hash) \
+ static struct attribute *pcr_group_attrs_##_hash[] = { \
+ _TPM_HELPER(_alg, _hash, PCR_ATTR_VAL) \
+ NULL \
+ }
+
+#define PCR_ATTR_GROUP(_alg, _hash) \
+ static struct attribute_group pcr_group_##_hash = { \
+ .name = "pcr-" __stringify(_hash), \
+ .attrs = pcr_group_attrs_##_hash \
+ }
+
+#define PCR_ATTR_BUILD(_alg, _hash) \
+ PCR_ATTRS(_alg, _hash) \
+ PCR_ATTR_GROUP_ARRAY(_alg, _hash); \
+ PCR_ATTR_GROUP(_alg, _hash)
+/*
+ * End of macro structure to build an attribute group containing 24
+ * PCR value files for each supported hash algorithm
+ */
+
+/*
+ * The next set of macros implements the cleverness for each hash to
+ * build a static attribute group called pcr_group_<hash> which can be
+ * added to chip->groups[].
+ *
+ * The first argument is the TPM algorithm id and the second is the
+ * hash used as both the suffix and the group name. Note: the group
+ * name is a directory in the top level tpm class with the name
+ * pcr-<hash>, so it must not clash with any other names already
+ * in the sysfs directory.
+ */
+PCR_ATTR_BUILD(TPM_ALG_SHA1, sha1);
+PCR_ATTR_BUILD(TPM_ALG_SHA256, sha256);
+PCR_ATTR_BUILD(TPM_ALG_SHA384, sha384);
+PCR_ATTR_BUILD(TPM_ALG_SHA512, sha512);
+PCR_ATTR_BUILD(TPM_ALG_SM3_256, sm3);
+
+
+void tpm_sysfs_add_device(struct tpm_chip *chip)
+{
+ int i;
+
+ WARN_ON(chip->groups_cnt != 0);
+
+ if (tpm_is_firmware_upgrade(chip))
+ return;
+
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ chip->groups[chip->groups_cnt++] = &tpm2_dev_group;
+ else
+ chip->groups[chip->groups_cnt++] = &tpm1_dev_group;
+
+ /* add one group for each bank hash */
+ for (i = 0; i < chip->nr_allocated_banks; i++) {
+ switch (chip->allocated_banks[i].alg_id) {
+ case TPM_ALG_SHA1:
+ chip->groups[chip->groups_cnt++] = &pcr_group_sha1;
+ break;
+ case TPM_ALG_SHA256:
+ chip->groups[chip->groups_cnt++] = &pcr_group_sha256;
+ break;
+ case TPM_ALG_SHA384:
+ chip->groups[chip->groups_cnt++] = &pcr_group_sha384;
+ break;
+ case TPM_ALG_SHA512:
+ chip->groups[chip->groups_cnt++] = &pcr_group_sha512;
+ break;
+ case TPM_ALG_SM3_256:
+ chip->groups[chip->groups_cnt++] = &pcr_group_sm3;
+ break;
+ default:
+ /*
+ * If triggers, send a patch to add both a
+ * PCR_ATTR_BUILD() macro above for the
+ * missing algorithm as well as an additional
+ * case in this switch statement.
+ */
+ dev_err(&chip->dev,
+ "TPM with unsupported bank algorithm 0x%04x",
+ chip->allocated_banks[i].alg_id);
+ break;
+ }
+ }
+
+ /*
+ * This will only trigger if someone has added an additional
+ * hash to the tpm_algorithms enum without incrementing
+ * TPM_MAX_HASHES.
+ */
+ WARN_ON(chip->groups_cnt > TPM_MAX_HASHES + 1);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 09:53:17 +0000