1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2004 IBM Corporation
  4 * Authors:
  5 * Leendert van Doorn <leendert@watson.ibm.com>
  6 * Dave Safford <safford@watson.ibm.com>
  7 * Reiner Sailer <sailer@watson.ibm.com>
  8 * Kylene Hall <kjhall@us.ibm.com>
  9 *
 10 * Copyright (C) 2013 Obsidian Research Corp
 11 * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
 12 *
 13 * sysfs filesystem inspection interface to the TPM
 14 */
 15#include <linux/device.h>
 16#include "tpm.h"
 17
 18struct tpm_readpubek_out {
 19	u8 algorithm[4];
 20	u8 encscheme[2];
 21	u8 sigscheme[2];
 22	__be32 paramsize;
 23	u8 parameters[12];
 24	__be32 keysize;
 25	u8 modulus[256];
 26	u8 checksum[20];
 27} __packed;
 28
 29#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
 30#define TPM_ORD_READPUBEK 124
 31
 32static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
 33			  char *buf)
 34{
 35	struct tpm_buf tpm_buf;
 36	struct tpm_readpubek_out *out;
 37	int i;
 38	char *str = buf;
 39	struct tpm_chip *chip = to_tpm_chip(dev);
 40	char anti_replay[20];
 41
 42	memset(&anti_replay, 0, sizeof(anti_replay));
 43
 44	if (tpm_try_get_ops(chip))
 45		return 0;
 46
 47	if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
 48		goto out_ops;
 49
 50	tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
 51
 52	if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
 53			     "attempting to read the PUBEK"))
 54		goto out_buf;
 55
 56	out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
 57	str +=
 58	    sprintf(str,
 59		    "Algorithm: %02X %02X %02X %02X\n"
 60		    "Encscheme: %02X %02X\n"
 61		    "Sigscheme: %02X %02X\n"
 62		    "Parameters: %02X %02X %02X %02X "
 63		    "%02X %02X %02X %02X "
 64		    "%02X %02X %02X %02X\n"
 65		    "Modulus length: %d\n"
 66		    "Modulus:\n",
 67		    out->algorithm[0], out->algorithm[1], out->algorithm[2],
 68		    out->algorithm[3],
 69		    out->encscheme[0], out->encscheme[1],
 70		    out->sigscheme[0], out->sigscheme[1],
 71		    out->parameters[0], out->parameters[1],
 72		    out->parameters[2], out->parameters[3],
 73		    out->parameters[4], out->parameters[5],
 74		    out->parameters[6], out->parameters[7],
 75		    out->parameters[8], out->parameters[9],
 76		    out->parameters[10], out->parameters[11],
 77		    be32_to_cpu(out->keysize));
 78
 79	for (i = 0; i < 256; i++) {
 80		str += sprintf(str, "%02X ", out->modulus[i]);
 81		if ((i + 1) % 16 == 0)
 82			str += sprintf(str, "\n");
 83	}
 84
 85out_buf:
 86	tpm_buf_destroy(&tpm_buf);
 87out_ops:
 88	tpm_put_ops(chip);
 89	return str - buf;
 90}
 91static DEVICE_ATTR_RO(pubek);
 92
 93static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
 94			 char *buf)
 95{
 96	cap_t cap;
 97	u8 digest[TPM_DIGEST_SIZE];
 98	u32 i, j, num_pcrs;
 99	char *str = buf;
100	struct tpm_chip *chip = to_tpm_chip(dev);
101
102	if (tpm_try_get_ops(chip))
103		return 0;
104
105	if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
106			"attempting to determine the number of PCRS",
107			sizeof(cap.num_pcrs))) {
108		tpm_put_ops(chip);
109		return 0;
110	}
111
112	num_pcrs = be32_to_cpu(cap.num_pcrs);
113	for (i = 0; i < num_pcrs; i++) {
114		if (tpm1_pcr_read(chip, i, digest)) {
115			str = buf;
116			break;
117		}
118		str += sprintf(str, "PCR-%02d: ", i);
119		for (j = 0; j < TPM_DIGEST_SIZE; j++)
120			str += sprintf(str, "%02X ", digest[j]);
121		str += sprintf(str, "\n");
122	}
123	tpm_put_ops(chip);
124	return str - buf;
125}
126static DEVICE_ATTR_RO(pcrs);
127
128static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
129		     char *buf)
130{
131	struct tpm_chip *chip = to_tpm_chip(dev);
132	ssize_t rc = 0;
133	cap_t cap;
134
135	if (tpm_try_get_ops(chip))
136		return 0;
137
138	if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
139			"attempting to determine the permanent enabled state",
140			sizeof(cap.perm_flags)))
141		goto out_ops;
142
143	rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
144out_ops:
145	tpm_put_ops(chip);
146	return rc;
147}
148static DEVICE_ATTR_RO(enabled);
149
150static ssize_t active_show(struct device *dev, struct device_attribute *attr,
151		    char *buf)
152{
153	struct tpm_chip *chip = to_tpm_chip(dev);
154	ssize_t rc = 0;
155	cap_t cap;
156
157	if (tpm_try_get_ops(chip))
158		return 0;
159
160	if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
161			"attempting to determine the permanent active state",
162			sizeof(cap.perm_flags)))
163		goto out_ops;
164
165	rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
166out_ops:
167	tpm_put_ops(chip);
168	return rc;
169}
170static DEVICE_ATTR_RO(active);
171
172static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
173			  char *buf)
174{
175	struct tpm_chip *chip = to_tpm_chip(dev);
176	ssize_t rc = 0;
177	cap_t cap;
178
179	if (tpm_try_get_ops(chip))
180		return 0;
181
182	if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
183			"attempting to determine the owner state",
184			sizeof(cap.owned)))
185		goto out_ops;
186
187	rc = sprintf(buf, "%d\n", cap.owned);
188out_ops:
189	tpm_put_ops(chip);
190	return rc;
191}
192static DEVICE_ATTR_RO(owned);
193
194static ssize_t temp_deactivated_show(struct device *dev,
195				     struct device_attribute *attr, char *buf)
196{
197	struct tpm_chip *chip = to_tpm_chip(dev);
198	ssize_t rc = 0;
199	cap_t cap;
200
201	if (tpm_try_get_ops(chip))
202		return 0;
203
204	if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
205			"attempting to determine the temporary state",
206			sizeof(cap.stclear_flags)))
207		goto out_ops;
208
209	rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
210out_ops:
211	tpm_put_ops(chip);
212	return rc;
213}
214static DEVICE_ATTR_RO(temp_deactivated);
215
216static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
217			 char *buf)
218{
219	struct tpm_chip *chip = to_tpm_chip(dev);
220	ssize_t rc = 0;
221	char *str = buf;
222	cap_t cap;
223
224	if (tpm_try_get_ops(chip))
225		return 0;
226
227	if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
228			"attempting to determine the manufacturer",
229			sizeof(cap.manufacturer_id)))
230		goto out_ops;
231
232	str += sprintf(str, "Manufacturer: 0x%x\n",
233		       be32_to_cpu(cap.manufacturer_id));
234
235	/* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
236	rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
237			 "attempting to determine the 1.2 version",
238			 sizeof(cap.tpm_version_1_2));
239	if (!rc) {
240		str += sprintf(str,
241			       "TCG version: %d.%d\nFirmware version: %d.%d\n",
242			       cap.tpm_version_1_2.Major,
243			       cap.tpm_version_1_2.Minor,
244			       cap.tpm_version_1_2.revMajor,
245			       cap.tpm_version_1_2.revMinor);
246	} else {
247		/* Otherwise just use TPM_STRUCT_VER */
248		if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
249				"attempting to determine the 1.1 version",
250				sizeof(cap.tpm_version)))
251			goto out_ops;
252		str += sprintf(str,
253			       "TCG version: %d.%d\nFirmware version: %d.%d\n",
254			       cap.tpm_version.Major,
255			       cap.tpm_version.Minor,
256			       cap.tpm_version.revMajor,
257			       cap.tpm_version.revMinor);
258	}
259	rc = str - buf;
260out_ops:
261	tpm_put_ops(chip);
262	return rc;
263}
264static DEVICE_ATTR_RO(caps);
265
266static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
267			    const char *buf, size_t count)
268{
269	struct tpm_chip *chip = to_tpm_chip(dev);
270
271	if (tpm_try_get_ops(chip))
272		return 0;
273
274	chip->ops->cancel(chip);
275	tpm_put_ops(chip);
276	return count;
277}
278static DEVICE_ATTR_WO(cancel);
279
280static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
281			      char *buf)
282{
283	struct tpm_chip *chip = to_tpm_chip(dev);
284
285	if (chip->duration[TPM_LONG] == 0)
286		return 0;
287
288	return sprintf(buf, "%d %d %d [%s]\n",
289		       jiffies_to_usecs(chip->duration[TPM_SHORT]),
290		       jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
291		       jiffies_to_usecs(chip->duration[TPM_LONG]),
292		       chip->duration_adjusted
293		       ? "adjusted" : "original");
294}
295static DEVICE_ATTR_RO(durations);
296
297static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
298			     char *buf)
299{
300	struct tpm_chip *chip = to_tpm_chip(dev);
301
302	return sprintf(buf, "%d %d %d %d [%s]\n",
303		       jiffies_to_usecs(chip->timeout_a),
304		       jiffies_to_usecs(chip->timeout_b),
305		       jiffies_to_usecs(chip->timeout_c),
306		       jiffies_to_usecs(chip->timeout_d),
307		       chip->timeout_adjusted
308		       ? "adjusted" : "original");
309}
310static DEVICE_ATTR_RO(timeouts);
311
312static struct attribute *tpm_dev_attrs[] = {
313	&dev_attr_pubek.attr,
314	&dev_attr_pcrs.attr,
315	&dev_attr_enabled.attr,
316	&dev_attr_active.attr,
317	&dev_attr_owned.attr,
318	&dev_attr_temp_deactivated.attr,
319	&dev_attr_caps.attr,
320	&dev_attr_cancel.attr,
321	&dev_attr_durations.attr,
322	&dev_attr_timeouts.attr,
323	NULL,
324};
325
326static const struct attribute_group tpm_dev_group = {
327	.attrs = tpm_dev_attrs,
328};
329
330void tpm_sysfs_add_device(struct tpm_chip *chip)
331{
332	if (chip->flags & TPM_CHIP_FLAG_TPM2)
333		return;
334
335	WARN_ON(chip->groups_cnt != 0);
336	chip->groups[chip->groups_cnt++] = &tpm_dev_group;
337}