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20#include <linux/device.h>
21#include "tpm.h"
22
23struct tpm_readpubek_out {
24 u8 algorithm[4];
25 u8 encscheme[2];
26 u8 sigscheme[2];
27 __be32 paramsize;
28 u8 parameters[12];
29 __be32 keysize;
30 u8 modulus[256];
31 u8 checksum[20];
32} __packed;
33
34#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
35#define TPM_ORD_READPUBEK 124
36
37static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
38 char *buf)
39{
40 struct tpm_buf tpm_buf;
41 struct tpm_readpubek_out *out;
42 int i;
43 char *str = buf;
44 struct tpm_chip *chip = to_tpm_chip(dev);
45 char anti_replay[20];
46
47 memset(&anti_replay, 0, sizeof(anti_replay));
48
49 if (tpm_try_get_ops(chip))
50 return 0;
51
52 if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
53 goto out_ops;
54
55 tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
56
57 if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
58 "attempting to read the PUBEK"))
59 goto out_buf;
60
61 out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
62 str +=
63 sprintf(str,
64 "Algorithm: %02X %02X %02X %02X\n"
65 "Encscheme: %02X %02X\n"
66 "Sigscheme: %02X %02X\n"
67 "Parameters: %02X %02X %02X %02X "
68 "%02X %02X %02X %02X "
69 "%02X %02X %02X %02X\n"
70 "Modulus length: %d\n"
71 "Modulus:\n",
72 out->algorithm[0], out->algorithm[1], out->algorithm[2],
73 out->algorithm[3],
74 out->encscheme[0], out->encscheme[1],
75 out->sigscheme[0], out->sigscheme[1],
76 out->parameters[0], out->parameters[1],
77 out->parameters[2], out->parameters[3],
78 out->parameters[4], out->parameters[5],
79 out->parameters[6], out->parameters[7],
80 out->parameters[8], out->parameters[9],
81 out->parameters[10], out->parameters[11],
82 be32_to_cpu(out->keysize));
83
84 for (i = 0; i < 256; i++) {
85 str += sprintf(str, "%02X ", out->modulus[i]);
86 if ((i + 1) % 16 == 0)
87 str += sprintf(str, "\n");
88 }
89
90out_buf:
91 tpm_buf_destroy(&tpm_buf);
92out_ops:
93 tpm_put_ops(chip);
94 return str - buf;
95}
96static DEVICE_ATTR_RO(pubek);
97
98static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
99 char *buf)
100{
101 cap_t cap;
102 u8 digest[TPM_DIGEST_SIZE];
103 u32 i, j, num_pcrs;
104 char *str = buf;
105 struct tpm_chip *chip = to_tpm_chip(dev);
106
107 if (tpm_try_get_ops(chip))
108 return 0;
109
110 if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
111 "attempting to determine the number of PCRS",
112 sizeof(cap.num_pcrs))) {
113 tpm_put_ops(chip);
114 return 0;
115 }
116
117 num_pcrs = be32_to_cpu(cap.num_pcrs);
118 for (i = 0; i < num_pcrs; i++) {
119 if (tpm1_pcr_read(chip, i, digest)) {
120 str = buf;
121 break;
122 }
123 str += sprintf(str, "PCR-%02d: ", i);
124 for (j = 0; j < TPM_DIGEST_SIZE; j++)
125 str += sprintf(str, "%02X ", digest[j]);
126 str += sprintf(str, "\n");
127 }
128 tpm_put_ops(chip);
129 return str - buf;
130}
131static DEVICE_ATTR_RO(pcrs);
132
133static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
134 char *buf)
135{
136 struct tpm_chip *chip = to_tpm_chip(dev);
137 ssize_t rc = 0;
138 cap_t cap;
139
140 if (tpm_try_get_ops(chip))
141 return 0;
142
143 if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
144 "attempting to determine the permanent enabled state",
145 sizeof(cap.perm_flags)))
146 goto out_ops;
147
148 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
149out_ops:
150 tpm_put_ops(chip);
151 return rc;
152}
153static DEVICE_ATTR_RO(enabled);
154
155static ssize_t active_show(struct device *dev, struct device_attribute *attr,
156 char *buf)
157{
158 struct tpm_chip *chip = to_tpm_chip(dev);
159 ssize_t rc = 0;
160 cap_t cap;
161
162 if (tpm_try_get_ops(chip))
163 return 0;
164
165 if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
166 "attempting to determine the permanent active state",
167 sizeof(cap.perm_flags)))
168 goto out_ops;
169
170 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
171out_ops:
172 tpm_put_ops(chip);
173 return rc;
174}
175static DEVICE_ATTR_RO(active);
176
177static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
178 char *buf)
179{
180 struct tpm_chip *chip = to_tpm_chip(dev);
181 ssize_t rc = 0;
182 cap_t cap;
183
184 if (tpm_try_get_ops(chip))
185 return 0;
186
187 if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
188 "attempting to determine the owner state",
189 sizeof(cap.owned)))
190 goto out_ops;
191
192 rc = sprintf(buf, "%d\n", cap.owned);
193out_ops:
194 tpm_put_ops(chip);
195 return rc;
196}
197static DEVICE_ATTR_RO(owned);
198
199static ssize_t temp_deactivated_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
201{
202 struct tpm_chip *chip = to_tpm_chip(dev);
203 ssize_t rc = 0;
204 cap_t cap;
205
206 if (tpm_try_get_ops(chip))
207 return 0;
208
209 if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
210 "attempting to determine the temporary state",
211 sizeof(cap.stclear_flags)))
212 goto out_ops;
213
214 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
215out_ops:
216 tpm_put_ops(chip);
217 return rc;
218}
219static DEVICE_ATTR_RO(temp_deactivated);
220
221static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
222 char *buf)
223{
224 struct tpm_chip *chip = to_tpm_chip(dev);
225 ssize_t rc = 0;
226 char *str = buf;
227 cap_t cap;
228
229 if (tpm_try_get_ops(chip))
230 return 0;
231
232 if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
233 "attempting to determine the manufacturer",
234 sizeof(cap.manufacturer_id)))
235 goto out_ops;
236
237 str += sprintf(str, "Manufacturer: 0x%x\n",
238 be32_to_cpu(cap.manufacturer_id));
239
240
241 rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
242 "attempting to determine the 1.2 version",
243 sizeof(cap.tpm_version_1_2));
244 if (!rc) {
245 str += sprintf(str,
246 "TCG version: %d.%d\nFirmware version: %d.%d\n",
247 cap.tpm_version_1_2.Major,
248 cap.tpm_version_1_2.Minor,
249 cap.tpm_version_1_2.revMajor,
250 cap.tpm_version_1_2.revMinor);
251 } else {
252
253 if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
254 "attempting to determine the 1.1 version",
255 sizeof(cap.tpm_version)))
256 goto out_ops;
257 str += sprintf(str,
258 "TCG version: %d.%d\nFirmware version: %d.%d\n",
259 cap.tpm_version.Major,
260 cap.tpm_version.Minor,
261 cap.tpm_version.revMajor,
262 cap.tpm_version.revMinor);
263 }
264 rc = str - buf;
265out_ops:
266 tpm_put_ops(chip);
267 return rc;
268}
269static DEVICE_ATTR_RO(caps);
270
271static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
272 const char *buf, size_t count)
273{
274 struct tpm_chip *chip = to_tpm_chip(dev);
275
276 if (tpm_try_get_ops(chip))
277 return 0;
278
279 chip->ops->cancel(chip);
280 tpm_put_ops(chip);
281 return count;
282}
283static DEVICE_ATTR_WO(cancel);
284
285static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
286 char *buf)
287{
288 struct tpm_chip *chip = to_tpm_chip(dev);
289
290 if (chip->duration[TPM_LONG] == 0)
291 return 0;
292
293 return sprintf(buf, "%d %d %d [%s]\n",
294 jiffies_to_usecs(chip->duration[TPM_SHORT]),
295 jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
296 jiffies_to_usecs(chip->duration[TPM_LONG]),
297 chip->duration_adjusted
298 ? "adjusted" : "original");
299}
300static DEVICE_ATTR_RO(durations);
301
302static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
303 char *buf)
304{
305 struct tpm_chip *chip = to_tpm_chip(dev);
306
307 return sprintf(buf, "%d %d %d %d [%s]\n",
308 jiffies_to_usecs(chip->timeout_a),
309 jiffies_to_usecs(chip->timeout_b),
310 jiffies_to_usecs(chip->timeout_c),
311 jiffies_to_usecs(chip->timeout_d),
312 chip->timeout_adjusted
313 ? "adjusted" : "original");
314}
315static DEVICE_ATTR_RO(timeouts);
316
317static struct attribute *tpm_dev_attrs[] = {
318 &dev_attr_pubek.attr,
319 &dev_attr_pcrs.attr,
320 &dev_attr_enabled.attr,
321 &dev_attr_active.attr,
322 &dev_attr_owned.attr,
323 &dev_attr_temp_deactivated.attr,
324 &dev_attr_caps.attr,
325 &dev_attr_cancel.attr,
326 &dev_attr_durations.attr,
327 &dev_attr_timeouts.attr,
328 NULL,
329};
330
331static const struct attribute_group tpm_dev_group = {
332 .attrs = tpm_dev_attrs,
333};
334
335void tpm_sysfs_add_device(struct tpm_chip *chip)
336{
337
338
339
340 if (chip->flags & TPM_CHIP_FLAG_TPM2)
341 return;
342
343
344
345
346
347 WARN_ON(chip->groups_cnt != 0);
348 chip->groups[chip->groups_cnt++] = &tpm_dev_group;
349}
350
