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 struct 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
pubek_show(struct device * dev,struct device_attribute * attr,char * buf)37 static 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, NULL, tpm_buf.data, PAGE_SIZE,
58 READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
59 "attempting to read the PUBEK"))
60 goto out_buf;
61
62 out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
63 str +=
64 sprintf(str,
65 "Algorithm: %02X %02X %02X %02X\n"
66 "Encscheme: %02X %02X\n"
67 "Sigscheme: %02X %02X\n"
68 "Parameters: %02X %02X %02X %02X "
69 "%02X %02X %02X %02X "
70 "%02X %02X %02X %02X\n"
71 "Modulus length: %d\n"
72 "Modulus:\n",
73 out->algorithm[0], out->algorithm[1], out->algorithm[2],
74 out->algorithm[3],
75 out->encscheme[0], out->encscheme[1],
76 out->sigscheme[0], out->sigscheme[1],
77 out->parameters[0], out->parameters[1],
78 out->parameters[2], out->parameters[3],
79 out->parameters[4], out->parameters[5],
80 out->parameters[6], out->parameters[7],
81 out->parameters[8], out->parameters[9],
82 out->parameters[10], out->parameters[11],
83 be32_to_cpu(out->keysize));
84
85 for (i = 0; i < 256; i++) {
86 str += sprintf(str, "%02X ", out->modulus[i]);
87 if ((i + 1) % 16 == 0)
88 str += sprintf(str, "\n");
89 }
90
91 out_buf:
92 tpm_buf_destroy(&tpm_buf);
93 out_ops:
94 tpm_put_ops(chip);
95 return str - buf;
96 }
97 static DEVICE_ATTR_RO(pubek);
98
pcrs_show(struct device * dev,struct device_attribute * attr,char * buf)99 static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
100 char *buf)
101 {
102 cap_t cap;
103 u8 digest[TPM_DIGEST_SIZE];
104 ssize_t rc;
105 int i, j, num_pcrs;
106 char *str = buf;
107 struct tpm_chip *chip = to_tpm_chip(dev);
108
109 if (tpm_try_get_ops(chip))
110 return 0;
111
112 if (tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap,
113 "attempting to determine the number of PCRS",
114 sizeof(cap.num_pcrs))) {
115 tpm_put_ops(chip);
116 return 0;
117 }
118
119 num_pcrs = be32_to_cpu(cap.num_pcrs);
120 for (i = 0; i < num_pcrs; i++) {
121 rc = tpm_pcr_read_dev(chip, i, digest);
122 if (rc)
123 break;
124 str += sprintf(str, "PCR-%02d: ", i);
125 for (j = 0; j < TPM_DIGEST_SIZE; j++)
126 str += sprintf(str, "%02X ", digest[j]);
127 str += sprintf(str, "\n");
128 }
129 tpm_put_ops(chip);
130 return str - buf;
131 }
132 static DEVICE_ATTR_RO(pcrs);
133
enabled_show(struct device * dev,struct device_attribute * attr,char * buf)134 static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
135 char *buf)
136 {
137 struct tpm_chip *chip = to_tpm_chip(dev);
138 ssize_t rc = 0;
139 cap_t cap;
140
141 if (tpm_try_get_ops(chip))
142 return 0;
143
144 if (tpm_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
145 "attempting to determine the permanent enabled state",
146 sizeof(cap.perm_flags)))
147 goto out_ops;
148
149 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
150 out_ops:
151 tpm_put_ops(chip);
152 return rc;
153 }
154 static DEVICE_ATTR_RO(enabled);
155
active_show(struct device * dev,struct device_attribute * attr,char * buf)156 static ssize_t active_show(struct device *dev, struct device_attribute *attr,
157 char *buf)
158 {
159 struct tpm_chip *chip = to_tpm_chip(dev);
160 ssize_t rc = 0;
161 cap_t cap;
162
163 if (tpm_try_get_ops(chip))
164 return 0;
165
166 if (tpm_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
167 "attempting to determine the permanent active state",
168 sizeof(cap.perm_flags)))
169 goto out_ops;
170
171 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
172 out_ops:
173 tpm_put_ops(chip);
174 return rc;
175 }
176 static DEVICE_ATTR_RO(active);
177
owned_show(struct device * dev,struct device_attribute * attr,char * buf)178 static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
179 char *buf)
180 {
181 struct tpm_chip *chip = to_tpm_chip(dev);
182 ssize_t rc = 0;
183 cap_t cap;
184
185 if (tpm_try_get_ops(chip))
186 return 0;
187
188 if (tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
189 "attempting to determine the owner state",
190 sizeof(cap.owned)))
191 goto out_ops;
192
193 rc = sprintf(buf, "%d\n", cap.owned);
194 out_ops:
195 tpm_put_ops(chip);
196 return rc;
197 }
198 static DEVICE_ATTR_RO(owned);
199
temp_deactivated_show(struct device * dev,struct device_attribute * attr,char * buf)200 static ssize_t temp_deactivated_show(struct device *dev,
201 struct device_attribute *attr, char *buf)
202 {
203 struct tpm_chip *chip = to_tpm_chip(dev);
204 ssize_t rc = 0;
205 cap_t cap;
206
207 if (tpm_try_get_ops(chip))
208 return 0;
209
210 if (tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
211 "attempting to determine the temporary state",
212 sizeof(cap.stclear_flags)))
213 goto out_ops;
214
215 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
216 out_ops:
217 tpm_put_ops(chip);
218 return rc;
219 }
220 static DEVICE_ATTR_RO(temp_deactivated);
221
caps_show(struct device * dev,struct device_attribute * attr,char * buf)222 static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
223 char *buf)
224 {
225 struct tpm_chip *chip = to_tpm_chip(dev);
226 ssize_t rc = 0;
227 char *str = buf;
228 cap_t cap;
229
230 if (tpm_try_get_ops(chip))
231 return 0;
232
233 if (tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
234 "attempting to determine the manufacturer",
235 sizeof(cap.manufacturer_id)))
236 goto out_ops;
237
238 str += sprintf(str, "Manufacturer: 0x%x\n",
239 be32_to_cpu(cap.manufacturer_id));
240
241 /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
242 rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
243 "attempting to determine the 1.2 version",
244 sizeof(cap.tpm_version_1_2));
245 if (!rc) {
246 str += sprintf(str,
247 "TCG version: %d.%d\nFirmware version: %d.%d\n",
248 cap.tpm_version_1_2.Major,
249 cap.tpm_version_1_2.Minor,
250 cap.tpm_version_1_2.revMajor,
251 cap.tpm_version_1_2.revMinor);
252 } else {
253 /* Otherwise just use TPM_STRUCT_VER */
254 if (tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
255 "attempting to determine the 1.1 version",
256 sizeof(cap.tpm_version)))
257 goto out_ops;
258
259 str += sprintf(str,
260 "TCG version: %d.%d\nFirmware version: %d.%d\n",
261 cap.tpm_version.Major,
262 cap.tpm_version.Minor,
263 cap.tpm_version.revMajor,
264 cap.tpm_version.revMinor);
265 }
266 rc = str - buf;
267 out_ops:
268 tpm_put_ops(chip);
269 return rc;
270 }
271 static DEVICE_ATTR_RO(caps);
272
cancel_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)273 static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
274 const char *buf, size_t count)
275 {
276 struct tpm_chip *chip = to_tpm_chip(dev);
277
278 if (tpm_try_get_ops(chip))
279 return 0;
280
281 chip->ops->cancel(chip);
282 tpm_put_ops(chip);
283 return count;
284 }
285 static DEVICE_ATTR_WO(cancel);
286
durations_show(struct device * dev,struct device_attribute * attr,char * buf)287 static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
288 char *buf)
289 {
290 struct tpm_chip *chip = to_tpm_chip(dev);
291
292 if (chip->duration[TPM_LONG] == 0)
293 return 0;
294
295 return sprintf(buf, "%d %d %d [%s]\n",
296 jiffies_to_usecs(chip->duration[TPM_SHORT]),
297 jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
298 jiffies_to_usecs(chip->duration[TPM_LONG]),
299 chip->duration_adjusted
300 ? "adjusted" : "original");
301 }
302 static DEVICE_ATTR_RO(durations);
303
timeouts_show(struct device * dev,struct device_attribute * attr,char * buf)304 static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
305 char *buf)
306 {
307 struct tpm_chip *chip = to_tpm_chip(dev);
308
309 return sprintf(buf, "%d %d %d %d [%s]\n",
310 jiffies_to_usecs(chip->timeout_a),
311 jiffies_to_usecs(chip->timeout_b),
312 jiffies_to_usecs(chip->timeout_c),
313 jiffies_to_usecs(chip->timeout_d),
314 chip->timeout_adjusted
315 ? "adjusted" : "original");
316 }
317 static DEVICE_ATTR_RO(timeouts);
318
319 static struct attribute *tpm_dev_attrs[] = {
320 &dev_attr_pubek.attr,
321 &dev_attr_pcrs.attr,
322 &dev_attr_enabled.attr,
323 &dev_attr_active.attr,
324 &dev_attr_owned.attr,
325 &dev_attr_temp_deactivated.attr,
326 &dev_attr_caps.attr,
327 &dev_attr_cancel.attr,
328 &dev_attr_durations.attr,
329 &dev_attr_timeouts.attr,
330 NULL,
331 };
332
333 static const struct attribute_group tpm_dev_group = {
334 .attrs = tpm_dev_attrs,
335 };
336
tpm_sysfs_add_device(struct tpm_chip * chip)337 void tpm_sysfs_add_device(struct tpm_chip *chip)
338 {
339 /* XXX: If you wish to remove this restriction, you must first update
340 * tpm_sysfs to explicitly lock chip->ops.
341 */
342 if (chip->flags & TPM_CHIP_FLAG_TPM2)
343 return;
344
345 /* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
346 * is called before ops is null'd and the sysfs core synchronizes this
347 * removal so that no callbacks are running or can run again
348 */
349 WARN_ON(chip->groups_cnt != 0);
350 chip->groups[chip->groups_cnt++] = &tpm_dev_group;
351 }
352