1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2004,2007,2008 IBM Corporation
4  *
5  * Authors:
6  * Leendert van Doorn <leendert@watson.ibm.com>
7  * Dave Safford <safford@watson.ibm.com>
8  * Reiner Sailer <sailer@watson.ibm.com>
9  * Kylene Hall <kjhall@us.ibm.com>
10  * Debora Velarde <dvelarde@us.ibm.com>
11  *
12  * Maintained by: <tpmdd_devel@lists.sourceforge.net>
13  *
14  * Device driver for TCG/TCPA TPM (trusted platform module).
15  * Specifications at www.trustedcomputinggroup.org
16  */
17 #ifndef __LINUX_TPM_H__
18 #define __LINUX_TPM_H__
19 
20 #include <linux/hw_random.h>
21 #include <linux/acpi.h>
22 #include <linux/cdev.h>
23 #include <linux/fs.h>
24 #include <linux/highmem.h>
25 #include <crypto/hash_info.h>
26 
27 #define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */
28 #define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
29 
30 struct tpm_chip;
31 struct trusted_key_payload;
32 struct trusted_key_options;
33 
34 /* if you add a new hash to this, increment TPM_MAX_HASHES below */
35 enum tpm_algorithms {
36 	TPM_ALG_ERROR		= 0x0000,
37 	TPM_ALG_SHA1		= 0x0004,
38 	TPM_ALG_KEYEDHASH	= 0x0008,
39 	TPM_ALG_SHA256		= 0x000B,
40 	TPM_ALG_SHA384		= 0x000C,
41 	TPM_ALG_SHA512		= 0x000D,
42 	TPM_ALG_NULL		= 0x0010,
43 	TPM_ALG_SM3_256		= 0x0012,
44 };
45 
46 /*
47  * maximum number of hashing algorithms a TPM can have.  This is
48  * basically a count of every hash in tpm_algorithms above
49  */
50 #define TPM_MAX_HASHES	5
51 
52 struct tpm_digest {
53 	u16 alg_id;
54 	u8 digest[TPM_MAX_DIGEST_SIZE];
55 } __packed;
56 
57 struct tpm_bank_info {
58 	u16 alg_id;
59 	u16 digest_size;
60 	u16 crypto_id;
61 };
62 
63 enum TPM_OPS_FLAGS {
64 	TPM_OPS_AUTO_STARTUP = BIT(0),
65 };
66 
67 struct tpm_class_ops {
68 	unsigned int flags;
69 	const u8 req_complete_mask;
70 	const u8 req_complete_val;
71 	bool (*req_canceled)(struct tpm_chip *chip, u8 status);
72 	int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
73 	int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
74 	void (*cancel) (struct tpm_chip *chip);
75 	u8 (*status) (struct tpm_chip *chip);
76 	void (*update_timeouts)(struct tpm_chip *chip,
77 				unsigned long *timeout_cap);
78 	void (*update_durations)(struct tpm_chip *chip,
79 				 unsigned long *duration_cap);
80 	int (*go_idle)(struct tpm_chip *chip);
81 	int (*cmd_ready)(struct tpm_chip *chip);
82 	int (*request_locality)(struct tpm_chip *chip, int loc);
83 	int (*relinquish_locality)(struct tpm_chip *chip, int loc);
84 	void (*clk_enable)(struct tpm_chip *chip, bool value);
85 };
86 
87 #define TPM_NUM_EVENT_LOG_FILES		3
88 
89 /* Indexes the duration array */
90 enum tpm_duration {
91 	TPM_SHORT = 0,
92 	TPM_MEDIUM = 1,
93 	TPM_LONG = 2,
94 	TPM_LONG_LONG = 3,
95 	TPM_UNDEFINED,
96 	TPM_NUM_DURATIONS = TPM_UNDEFINED,
97 };
98 
99 #define TPM_PPI_VERSION_LEN		3
100 
101 struct tpm_space {
102 	u32 context_tbl[3];
103 	u8 *context_buf;
104 	u32 session_tbl[3];
105 	u8 *session_buf;
106 	u32 buf_size;
107 };
108 
109 struct tpm_bios_log {
110 	void *bios_event_log;
111 	void *bios_event_log_end;
112 };
113 
114 struct tpm_chip_seqops {
115 	struct tpm_chip *chip;
116 	const struct seq_operations *seqops;
117 };
118 
119 struct tpm_chip {
120 	struct device dev;
121 	struct device devs;
122 	struct cdev cdev;
123 	struct cdev cdevs;
124 
125 	/* A driver callback under ops cannot be run unless ops_sem is held
126 	 * (sometimes implicitly, eg for the sysfs code). ops becomes null
127 	 * when the driver is unregistered, see tpm_try_get_ops.
128 	 */
129 	struct rw_semaphore ops_sem;
130 	const struct tpm_class_ops *ops;
131 
132 	struct tpm_bios_log log;
133 	struct tpm_chip_seqops bin_log_seqops;
134 	struct tpm_chip_seqops ascii_log_seqops;
135 
136 	unsigned int flags;
137 
138 	int dev_num;		/* /dev/tpm# */
139 	unsigned long is_open;	/* only one allowed */
140 
141 	char hwrng_name[64];
142 	struct hwrng hwrng;
143 
144 	struct mutex tpm_mutex;	/* tpm is processing */
145 
146 	unsigned long timeout_a; /* jiffies */
147 	unsigned long timeout_b; /* jiffies */
148 	unsigned long timeout_c; /* jiffies */
149 	unsigned long timeout_d; /* jiffies */
150 	bool timeout_adjusted;
151 	unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
152 	bool duration_adjusted;
153 
154 	struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
155 
156 	const struct attribute_group *groups[3 + TPM_MAX_HASHES];
157 	unsigned int groups_cnt;
158 
159 	u32 nr_allocated_banks;
160 	struct tpm_bank_info *allocated_banks;
161 #ifdef CONFIG_ACPI
162 	acpi_handle acpi_dev_handle;
163 	char ppi_version[TPM_PPI_VERSION_LEN + 1];
164 #endif /* CONFIG_ACPI */
165 
166 	struct tpm_space work_space;
167 	u32 last_cc;
168 	u32 nr_commands;
169 	u32 *cc_attrs_tbl;
170 
171 	/* active locality */
172 	int locality;
173 };
174 
175 #define TPM_HEADER_SIZE		10
176 
177 enum tpm2_const {
178 	TPM2_PLATFORM_PCR       =     24,
179 	TPM2_PCR_SELECT_MIN     = ((TPM2_PLATFORM_PCR + 7) / 8),
180 };
181 
182 enum tpm2_timeouts {
183 	TPM2_TIMEOUT_A          =    750,
184 	TPM2_TIMEOUT_B          =   2000,
185 	TPM2_TIMEOUT_C          =    200,
186 	TPM2_TIMEOUT_D          =     30,
187 	TPM2_DURATION_SHORT     =     20,
188 	TPM2_DURATION_MEDIUM    =    750,
189 	TPM2_DURATION_LONG      =   2000,
190 	TPM2_DURATION_LONG_LONG = 300000,
191 	TPM2_DURATION_DEFAULT   = 120000,
192 };
193 
194 enum tpm2_structures {
195 	TPM2_ST_NO_SESSIONS	= 0x8001,
196 	TPM2_ST_SESSIONS	= 0x8002,
197 };
198 
199 /* Indicates from what layer of the software stack the error comes from */
200 #define TSS2_RC_LAYER_SHIFT	 16
201 #define TSS2_RESMGR_TPM_RC_LAYER (11 << TSS2_RC_LAYER_SHIFT)
202 
203 enum tpm2_return_codes {
204 	TPM2_RC_SUCCESS		= 0x0000,
205 	TPM2_RC_HASH		= 0x0083, /* RC_FMT1 */
206 	TPM2_RC_HANDLE		= 0x008B,
207 	TPM2_RC_INITIALIZE	= 0x0100, /* RC_VER1 */
208 	TPM2_RC_FAILURE		= 0x0101,
209 	TPM2_RC_DISABLED	= 0x0120,
210 	TPM2_RC_COMMAND_CODE    = 0x0143,
211 	TPM2_RC_TESTING		= 0x090A, /* RC_WARN */
212 	TPM2_RC_REFERENCE_H0	= 0x0910,
213 	TPM2_RC_RETRY		= 0x0922,
214 };
215 
216 enum tpm2_command_codes {
217 	TPM2_CC_FIRST		        = 0x011F,
218 	TPM2_CC_HIERARCHY_CONTROL       = 0x0121,
219 	TPM2_CC_HIERARCHY_CHANGE_AUTH   = 0x0129,
220 	TPM2_CC_CREATE_PRIMARY          = 0x0131,
221 	TPM2_CC_SEQUENCE_COMPLETE       = 0x013E,
222 	TPM2_CC_SELF_TEST	        = 0x0143,
223 	TPM2_CC_STARTUP		        = 0x0144,
224 	TPM2_CC_SHUTDOWN	        = 0x0145,
225 	TPM2_CC_NV_READ                 = 0x014E,
226 	TPM2_CC_CREATE		        = 0x0153,
227 	TPM2_CC_LOAD		        = 0x0157,
228 	TPM2_CC_SEQUENCE_UPDATE         = 0x015C,
229 	TPM2_CC_UNSEAL		        = 0x015E,
230 	TPM2_CC_CONTEXT_LOAD	        = 0x0161,
231 	TPM2_CC_CONTEXT_SAVE	        = 0x0162,
232 	TPM2_CC_FLUSH_CONTEXT	        = 0x0165,
233 	TPM2_CC_VERIFY_SIGNATURE        = 0x0177,
234 	TPM2_CC_GET_CAPABILITY	        = 0x017A,
235 	TPM2_CC_GET_RANDOM	        = 0x017B,
236 	TPM2_CC_PCR_READ	        = 0x017E,
237 	TPM2_CC_PCR_EXTEND	        = 0x0182,
238 	TPM2_CC_EVENT_SEQUENCE_COMPLETE = 0x0185,
239 	TPM2_CC_HASH_SEQUENCE_START     = 0x0186,
240 	TPM2_CC_CREATE_LOADED           = 0x0191,
241 	TPM2_CC_LAST		        = 0x0193, /* Spec 1.36 */
242 };
243 
244 enum tpm2_permanent_handles {
245 	TPM2_RS_PW		= 0x40000009,
246 };
247 
248 enum tpm2_capabilities {
249 	TPM2_CAP_HANDLES	= 1,
250 	TPM2_CAP_COMMANDS	= 2,
251 	TPM2_CAP_PCRS		= 5,
252 	TPM2_CAP_TPM_PROPERTIES = 6,
253 };
254 
255 enum tpm2_properties {
256 	TPM_PT_TOTAL_COMMANDS	= 0x0129,
257 };
258 
259 enum tpm2_startup_types {
260 	TPM2_SU_CLEAR	= 0x0000,
261 	TPM2_SU_STATE	= 0x0001,
262 };
263 
264 enum tpm2_cc_attrs {
265 	TPM2_CC_ATTR_CHANDLES	= 25,
266 	TPM2_CC_ATTR_RHANDLE	= 28,
267 };
268 
269 #define TPM_VID_INTEL    0x8086
270 #define TPM_VID_WINBOND  0x1050
271 #define TPM_VID_STM      0x104A
272 
273 enum tpm_chip_flags {
274 	TPM_CHIP_FLAG_TPM2		= BIT(1),
275 	TPM_CHIP_FLAG_IRQ		= BIT(2),
276 	TPM_CHIP_FLAG_VIRTUAL		= BIT(3),
277 	TPM_CHIP_FLAG_HAVE_TIMEOUTS	= BIT(4),
278 	TPM_CHIP_FLAG_ALWAYS_POWERED	= BIT(5),
279 	TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED	= BIT(6),
280 };
281 
282 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
283 
284 struct tpm_header {
285 	__be16 tag;
286 	__be32 length;
287 	union {
288 		__be32 ordinal;
289 		__be32 return_code;
290 	};
291 } __packed;
292 
293 /* A string buffer type for constructing TPM commands. This is based on the
294  * ideas of string buffer code in security/keys/trusted.h but is heap based
295  * in order to keep the stack usage minimal.
296  */
297 
298 enum tpm_buf_flags {
299 	TPM_BUF_OVERFLOW	= BIT(0),
300 };
301 
302 struct tpm_buf {
303 	unsigned int flags;
304 	u8 *data;
305 };
306 
307 enum tpm2_object_attributes {
308 	TPM2_OA_FIXED_TPM		= BIT(1),
309 	TPM2_OA_FIXED_PARENT		= BIT(4),
310 	TPM2_OA_USER_WITH_AUTH		= BIT(6),
311 };
312 
313 enum tpm2_session_attributes {
314 	TPM2_SA_CONTINUE_SESSION	= BIT(0),
315 };
316 
317 struct tpm2_hash {
318 	unsigned int crypto_id;
319 	unsigned int tpm_id;
320 };
321 
tpm_buf_reset(struct tpm_buf * buf,u16 tag,u32 ordinal)322 static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
323 {
324 	struct tpm_header *head = (struct tpm_header *)buf->data;
325 
326 	head->tag = cpu_to_be16(tag);
327 	head->length = cpu_to_be32(sizeof(*head));
328 	head->ordinal = cpu_to_be32(ordinal);
329 }
330 
tpm_buf_init(struct tpm_buf * buf,u16 tag,u32 ordinal)331 static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
332 {
333 	buf->data = (u8 *)__get_free_page(GFP_KERNEL);
334 	if (!buf->data)
335 		return -ENOMEM;
336 
337 	buf->flags = 0;
338 	tpm_buf_reset(buf, tag, ordinal);
339 	return 0;
340 }
341 
tpm_buf_destroy(struct tpm_buf * buf)342 static inline void tpm_buf_destroy(struct tpm_buf *buf)
343 {
344 	free_page((unsigned long)buf->data);
345 }
346 
tpm_buf_length(struct tpm_buf * buf)347 static inline u32 tpm_buf_length(struct tpm_buf *buf)
348 {
349 	struct tpm_header *head = (struct tpm_header *)buf->data;
350 
351 	return be32_to_cpu(head->length);
352 }
353 
tpm_buf_tag(struct tpm_buf * buf)354 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
355 {
356 	struct tpm_header *head = (struct tpm_header *)buf->data;
357 
358 	return be16_to_cpu(head->tag);
359 }
360 
tpm_buf_append(struct tpm_buf * buf,const unsigned char * new_data,unsigned int new_len)361 static inline void tpm_buf_append(struct tpm_buf *buf,
362 				  const unsigned char *new_data,
363 				  unsigned int new_len)
364 {
365 	struct tpm_header *head = (struct tpm_header *)buf->data;
366 	u32 len = tpm_buf_length(buf);
367 
368 	/* Return silently if overflow has already happened. */
369 	if (buf->flags & TPM_BUF_OVERFLOW)
370 		return;
371 
372 	if ((len + new_len) > PAGE_SIZE) {
373 		WARN(1, "tpm_buf: overflow\n");
374 		buf->flags |= TPM_BUF_OVERFLOW;
375 		return;
376 	}
377 
378 	memcpy(&buf->data[len], new_data, new_len);
379 	head->length = cpu_to_be32(len + new_len);
380 }
381 
tpm_buf_append_u8(struct tpm_buf * buf,const u8 value)382 static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
383 {
384 	tpm_buf_append(buf, &value, 1);
385 }
386 
tpm_buf_append_u16(struct tpm_buf * buf,const u16 value)387 static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
388 {
389 	__be16 value2 = cpu_to_be16(value);
390 
391 	tpm_buf_append(buf, (u8 *) &value2, 2);
392 }
393 
tpm_buf_append_u32(struct tpm_buf * buf,const u32 value)394 static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
395 {
396 	__be32 value2 = cpu_to_be32(value);
397 
398 	tpm_buf_append(buf, (u8 *) &value2, 4);
399 }
400 
tpm2_rc_value(u32 rc)401 static inline u32 tpm2_rc_value(u32 rc)
402 {
403 	return (rc & BIT(7)) ? rc & 0xff : rc;
404 }
405 
406 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
407 
408 extern int tpm_is_tpm2(struct tpm_chip *chip);
409 extern __must_check int tpm_try_get_ops(struct tpm_chip *chip);
410 extern void tpm_put_ops(struct tpm_chip *chip);
411 extern ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
412 				size_t min_rsp_body_length, const char *desc);
413 extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
414 			struct tpm_digest *digest);
415 extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
416 			  struct tpm_digest *digests);
417 extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
418 extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
419 extern struct tpm_chip *tpm_default_chip(void);
420 void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
421 #else
tpm_is_tpm2(struct tpm_chip * chip)422 static inline int tpm_is_tpm2(struct tpm_chip *chip)
423 {
424 	return -ENODEV;
425 }
tpm_pcr_read(struct tpm_chip * chip,int pcr_idx,struct tpm_digest * digest)426 static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx,
427 			       struct tpm_digest *digest)
428 {
429 	return -ENODEV;
430 }
431 
tpm_pcr_extend(struct tpm_chip * chip,u32 pcr_idx,struct tpm_digest * digests)432 static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
433 				 struct tpm_digest *digests)
434 {
435 	return -ENODEV;
436 }
437 
tpm_send(struct tpm_chip * chip,void * cmd,size_t buflen)438 static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
439 {
440 	return -ENODEV;
441 }
tpm_get_random(struct tpm_chip * chip,u8 * data,size_t max)442 static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
443 {
444 	return -ENODEV;
445 }
446 
tpm_default_chip(void)447 static inline struct tpm_chip *tpm_default_chip(void)
448 {
449 	return NULL;
450 }
451 #endif
452 #endif
453