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1/*
2 * Copyright (C) 2004 IBM Corporation
3 * Authors:
4 * Leendert van Doorn <leendert@watson.ibm.com>
5 * Dave Safford <safford@watson.ibm.com>
6 * Reiner Sailer <sailer@watson.ibm.com>
7 * Kylene Hall <kjhall@us.ibm.com>
8 *
9 * Copyright (C) 2013 Obsidian Research Corp
10 * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
11 *
12 * sysfs filesystem inspection interface to the TPM
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation, version 2 of the
17 * License.
18 *
19 */
20#include <linux/device.h>
21#include "tpm.h"
22
23#define READ_PUBEK_RESULT_SIZE 314
24#define TPM_ORD_READPUBEK cpu_to_be32(124)
25static struct tpm_input_header tpm_readpubek_header = {
26 .tag = TPM_TAG_RQU_COMMAND,
27 .length = cpu_to_be32(30),
28 .ordinal = TPM_ORD_READPUBEK
29};
30static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
31 char *buf)
32{
33 u8 *data;
34 struct tpm_cmd_t tpm_cmd;
35 ssize_t err;
36 int i, rc;
37 char *str = buf;
38
39 struct tpm_chip *chip = dev_get_drvdata(dev);
40
41 tpm_cmd.header.in = tpm_readpubek_header;
42 err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
43 "attempting to read the PUBEK");
44 if (err)
45 goto out;
46
47 /*
48 ignore header 10 bytes
49 algorithm 32 bits (1 == RSA )
50 encscheme 16 bits
51 sigscheme 16 bits
52 parameters (RSA 12->bytes: keybit, #primes, expbit)
53 keylenbytes 32 bits
54 256 byte modulus
55 ignore checksum 20 bytes
56 */
57 data = tpm_cmd.params.readpubek_out_buffer;
58 str +=
59 sprintf(str,
60 "Algorithm: %02X %02X %02X %02X\n"
61 "Encscheme: %02X %02X\n"
62 "Sigscheme: %02X %02X\n"
63 "Parameters: %02X %02X %02X %02X "
64 "%02X %02X %02X %02X "
65 "%02X %02X %02X %02X\n"
66 "Modulus length: %d\n"
67 "Modulus:\n",
68 data[0], data[1], data[2], data[3],
69 data[4], data[5],
70 data[6], data[7],
71 data[12], data[13], data[14], data[15],
72 data[16], data[17], data[18], data[19],
73 data[20], data[21], data[22], data[23],
74 be32_to_cpu(*((__be32 *) (data + 24))));
75
76 for (i = 0; i < 256; i++) {
77 str += sprintf(str, "%02X ", data[i + 28]);
78 if ((i + 1) % 16 == 0)
79 str += sprintf(str, "\n");
80 }
81out:
82 rc = str - buf;
83 return rc;
84}
85static DEVICE_ATTR_RO(pubek);
86
87static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
88 char *buf)
89{
90 cap_t cap;
91 u8 digest[TPM_DIGEST_SIZE];
92 ssize_t rc;
93 int i, j, num_pcrs;
94 char *str = buf;
95 struct tpm_chip *chip = dev_get_drvdata(dev);
96
97 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
98 "attempting to determine the number of PCRS");
99 if (rc)
100 return 0;
101
102 num_pcrs = be32_to_cpu(cap.num_pcrs);
103 for (i = 0; i < num_pcrs; i++) {
104 rc = tpm_pcr_read_dev(chip, i, digest);
105 if (rc)
106 break;
107 str += sprintf(str, "PCR-%02d: ", i);
108 for (j = 0; j < TPM_DIGEST_SIZE; j++)
109 str += sprintf(str, "%02X ", digest[j]);
110 str += sprintf(str, "\n");
111 }
112 return str - buf;
113}
114static DEVICE_ATTR_RO(pcrs);
115
116static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
117 char *buf)
118{
119 cap_t cap;
120 ssize_t rc;
121
122 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
123 "attempting to determine the permanent enabled state");
124 if (rc)
125 return 0;
126
127 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
128 return rc;
129}
130static DEVICE_ATTR_RO(enabled);
131
132static ssize_t active_show(struct device *dev, struct device_attribute *attr,
133 char *buf)
134{
135 cap_t cap;
136 ssize_t rc;
137
138 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
139 "attempting to determine the permanent active state");
140 if (rc)
141 return 0;
142
143 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
144 return rc;
145}
146static DEVICE_ATTR_RO(active);
147
148static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
149 char *buf)
150{
151 cap_t cap;
152 ssize_t rc;
153
154 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
155 "attempting to determine the owner state");
156 if (rc)
157 return 0;
158
159 rc = sprintf(buf, "%d\n", cap.owned);
160 return rc;
161}
162static DEVICE_ATTR_RO(owned);
163
164static ssize_t temp_deactivated_show(struct device *dev,
165 struct device_attribute *attr, char *buf)
166{
167 cap_t cap;
168 ssize_t rc;
169
170 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
171 "attempting to determine the temporary state");
172 if (rc)
173 return 0;
174
175 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
176 return rc;
177}
178static DEVICE_ATTR_RO(temp_deactivated);
179
180static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
181 char *buf)
182{
183 cap_t cap;
184 ssize_t rc;
185 char *str = buf;
186
187 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
188 "attempting to determine the manufacturer");
189 if (rc)
190 return 0;
191 str += sprintf(str, "Manufacturer: 0x%x\n",
192 be32_to_cpu(cap.manufacturer_id));
193
194 /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
195 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
196 "attempting to determine the 1.2 version");
197 if (!rc) {
198 str += sprintf(str,
199 "TCG version: %d.%d\nFirmware version: %d.%d\n",
200 cap.tpm_version_1_2.Major,
201 cap.tpm_version_1_2.Minor,
202 cap.tpm_version_1_2.revMajor,
203 cap.tpm_version_1_2.revMinor);
204 } else {
205 /* Otherwise just use TPM_STRUCT_VER */
206 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
207 "attempting to determine the 1.1 version");
208 if (rc)
209 return 0;
210 str += sprintf(str,
211 "TCG version: %d.%d\nFirmware version: %d.%d\n",
212 cap.tpm_version.Major,
213 cap.tpm_version.Minor,
214 cap.tpm_version.revMajor,
215 cap.tpm_version.revMinor);
216 }
217
218 return str - buf;
219}
220static DEVICE_ATTR_RO(caps);
221
222static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
223 const char *buf, size_t count)
224{
225 struct tpm_chip *chip = dev_get_drvdata(dev);
226 if (chip == NULL)
227 return 0;
228
229 chip->ops->cancel(chip);
230 return count;
231}
232static DEVICE_ATTR_WO(cancel);
233
234static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
235 char *buf)
236{
237 struct tpm_chip *chip = dev_get_drvdata(dev);
238
239 if (chip->vendor.duration[TPM_LONG] == 0)
240 return 0;
241
242 return sprintf(buf, "%d %d %d [%s]\n",
243 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
244 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
245 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
246 chip->vendor.duration_adjusted
247 ? "adjusted" : "original");
248}
249static DEVICE_ATTR_RO(durations);
250
251static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
252 char *buf)
253{
254 struct tpm_chip *chip = dev_get_drvdata(dev);
255
256 return sprintf(buf, "%d %d %d %d [%s]\n",
257 jiffies_to_usecs(chip->vendor.timeout_a),
258 jiffies_to_usecs(chip->vendor.timeout_b),
259 jiffies_to_usecs(chip->vendor.timeout_c),
260 jiffies_to_usecs(chip->vendor.timeout_d),
261 chip->vendor.timeout_adjusted
262 ? "adjusted" : "original");
263}
264static DEVICE_ATTR_RO(timeouts);
265
266static struct attribute *tpm_dev_attrs[] = {
267 &dev_attr_pubek.attr,
268 &dev_attr_pcrs.attr,
269 &dev_attr_enabled.attr,
270 &dev_attr_active.attr,
271 &dev_attr_owned.attr,
272 &dev_attr_temp_deactivated.attr,
273 &dev_attr_caps.attr,
274 &dev_attr_cancel.attr,
275 &dev_attr_durations.attr,
276 &dev_attr_timeouts.attr,
277 NULL,
278};
279
280static const struct attribute_group tpm_dev_group = {
281 .attrs = tpm_dev_attrs,
282};
283
284int tpm_sysfs_add_device(struct tpm_chip *chip)
285{
286 int err;
287 err = sysfs_create_group(&chip->pdev->kobj,
288 &tpm_dev_group);
289
290 if (err)
291 dev_err(chip->pdev,
292 "failed to create sysfs attributes, %d\n", err);
293 return err;
294}
295
296void tpm_sysfs_del_device(struct tpm_chip *chip)
297{
298 sysfs_remove_group(&chip->pdev->kobj, &tpm_dev_group);
299}
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}