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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 struct tpm1_version *version;
221 ssize_t rc = 0;
222 char *str = buf;
223 cap_t cap;
224
225 if (tpm_try_get_ops(chip))
226 return 0;
227
228 if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
229 "attempting to determine the manufacturer",
230 sizeof(cap.manufacturer_id)))
231 goto out_ops;
232
233 str += sprintf(str, "Manufacturer: 0x%x\n",
234 be32_to_cpu(cap.manufacturer_id));
235
236 /* TPM 1.2 */
237 if (!tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
238 "attempting to determine the 1.2 version",
239 sizeof(cap.version2))) {
240 version = &cap.version2.version;
241 goto out_print;
242 }
243
244 /* TPM 1.1 */
245 if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
246 "attempting to determine the 1.1 version",
247 sizeof(cap.version1))) {
248 goto out_ops;
249 }
250
251 version = &cap.version1;
252
253out_print:
254 str += sprintf(str,
255 "TCG version: %d.%d\nFirmware version: %d.%d\n",
256 version->major, version->minor,
257 version->rev_major, version->rev_minor);
258
259 rc = str - buf;
260
261out_ops:
262 tpm_put_ops(chip);
263 return rc;
264}
265static DEVICE_ATTR_RO(caps);
266
267static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
268 const char *buf, size_t count)
269{
270 struct tpm_chip *chip = to_tpm_chip(dev);
271
272 if (tpm_try_get_ops(chip))
273 return 0;
274
275 chip->ops->cancel(chip);
276 tpm_put_ops(chip);
277 return count;
278}
279static DEVICE_ATTR_WO(cancel);
280
281static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
282 char *buf)
283{
284 struct tpm_chip *chip = to_tpm_chip(dev);
285
286 if (chip->duration[TPM_LONG] == 0)
287 return 0;
288
289 return sprintf(buf, "%d %d %d [%s]\n",
290 jiffies_to_usecs(chip->duration[TPM_SHORT]),
291 jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
292 jiffies_to_usecs(chip->duration[TPM_LONG]),
293 chip->duration_adjusted
294 ? "adjusted" : "original");
295}
296static DEVICE_ATTR_RO(durations);
297
298static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
299 char *buf)
300{
301 struct tpm_chip *chip = to_tpm_chip(dev);
302
303 return sprintf(buf, "%d %d %d %d [%s]\n",
304 jiffies_to_usecs(chip->timeout_a),
305 jiffies_to_usecs(chip->timeout_b),
306 jiffies_to_usecs(chip->timeout_c),
307 jiffies_to_usecs(chip->timeout_d),
308 chip->timeout_adjusted
309 ? "adjusted" : "original");
310}
311static DEVICE_ATTR_RO(timeouts);
312
313static ssize_t tpm_version_major_show(struct device *dev,
314 struct device_attribute *attr, char *buf)
315{
316 struct tpm_chip *chip = to_tpm_chip(dev);
317
318 return sprintf(buf, "%s\n", chip->flags & TPM_CHIP_FLAG_TPM2
319 ? "2" : "1");
320}
321static DEVICE_ATTR_RO(tpm_version_major);
322
323static struct attribute *tpm1_dev_attrs[] = {
324 &dev_attr_pubek.attr,
325 &dev_attr_pcrs.attr,
326 &dev_attr_enabled.attr,
327 &dev_attr_active.attr,
328 &dev_attr_owned.attr,
329 &dev_attr_temp_deactivated.attr,
330 &dev_attr_caps.attr,
331 &dev_attr_cancel.attr,
332 &dev_attr_durations.attr,
333 &dev_attr_timeouts.attr,
334 &dev_attr_tpm_version_major.attr,
335 NULL,
336};
337
338static struct attribute *tpm2_dev_attrs[] = {
339 &dev_attr_tpm_version_major.attr,
340 NULL
341};
342
343static const struct attribute_group tpm1_dev_group = {
344 .attrs = tpm1_dev_attrs,
345};
346
347static const struct attribute_group tpm2_dev_group = {
348 .attrs = tpm2_dev_attrs,
349};
350
351void tpm_sysfs_add_device(struct tpm_chip *chip)
352{
353 WARN_ON(chip->groups_cnt != 0);
354 if (chip->flags & TPM_CHIP_FLAG_TPM2)
355 chip->groups[chip->groups_cnt++] = &tpm2_dev_group;
356 else
357 chip->groups[chip->groups_cnt++] = &tpm1_dev_group;
358}