1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2013 The Chromium OS Authors.
4 */
5
6 #include <common.h>
7 #include <command.h>
8 #include <dm.h>
9 #include <env.h>
10 #include <malloc.h>
11 #include <asm/unaligned.h>
12 #include <linux/string.h>
13 #include <tpm-common.h>
14 #include "tpm-user-utils.h"
15
16 static struct udevice *tpm_dev;
17
18 /**
19 * Print a byte string in hexdecimal format, 16-bytes per line.
20 *
21 * @param data byte string to be printed
22 * @param count number of bytes to be printed
23 */
print_byte_string(u8 * data,size_t count)24 void print_byte_string(u8 *data, size_t count)
25 {
26 int i, print_newline = 0;
27
28 for (i = 0; i < count; i++) {
29 printf(" %02x", data[i]);
30 print_newline = (i % 16 == 15);
31 if (print_newline)
32 putc('\n');
33 }
34 /* Avoid duplicated newline at the end */
35 if (!print_newline)
36 putc('\n');
37 }
38
39 /**
40 * Convert a text string of hexdecimal values into a byte string.
41 *
42 * @param bytes text string of hexdecimal values with no space
43 * between them
44 * @param data output buffer for byte string. The caller has to make
45 * sure it is large enough for storing the output. If
46 * NULL is passed, a large enough buffer will be allocated,
47 * and the caller must free it.
48 * @param count_ptr output variable for the length of byte string
49 * @return pointer to output buffer
50 */
parse_byte_string(char * bytes,u8 * data,size_t * count_ptr)51 void *parse_byte_string(char *bytes, u8 *data, size_t *count_ptr)
52 {
53 char byte[3];
54 size_t count, length;
55 int i;
56
57 if (!bytes)
58 return NULL;
59 length = strlen(bytes);
60 count = length / 2;
61
62 if (!data)
63 data = malloc(count);
64 if (!data)
65 return NULL;
66
67 byte[2] = '\0';
68 for (i = 0; i < length; i += 2) {
69 byte[0] = bytes[i];
70 byte[1] = bytes[i + 1];
71 data[i / 2] = (u8)simple_strtoul(byte, NULL, 16);
72 }
73
74 if (count_ptr)
75 *count_ptr = count;
76
77 return data;
78 }
79
80 /**
81 * report_return_code() - Report any error and return failure or success
82 *
83 * @param return_code TPM command return code
84 * @return value of enum command_ret_t
85 */
report_return_code(int return_code)86 int report_return_code(int return_code)
87 {
88 if (return_code) {
89 printf("Error: %d\n", return_code);
90 return CMD_RET_FAILURE;
91 } else {
92 return CMD_RET_SUCCESS;
93 }
94 }
95
96 /**
97 * Return number of values defined by a type string.
98 *
99 * @param type_str type string
100 * @return number of values of type string
101 */
type_string_get_num_values(const char * type_str)102 int type_string_get_num_values(const char *type_str)
103 {
104 return strlen(type_str);
105 }
106
107 /**
108 * Return total size of values defined by a type string.
109 *
110 * @param type_str type string
111 * @return total size of values of type string, or 0 if type string
112 * contains illegal type character.
113 */
type_string_get_space_size(const char * type_str)114 size_t type_string_get_space_size(const char *type_str)
115 {
116 size_t size;
117
118 for (size = 0; *type_str; type_str++) {
119 switch (*type_str) {
120 case 'b':
121 size += 1;
122 break;
123 case 'w':
124 size += 2;
125 break;
126 case 'd':
127 size += 4;
128 break;
129 default:
130 return 0;
131 }
132 }
133
134 return size;
135 }
136
137 /**
138 * Allocate a buffer large enough to hold values defined by a type
139 * string. The caller has to free the buffer.
140 *
141 * @param type_str type string
142 * @param count pointer for storing size of buffer
143 * @return pointer to buffer or NULL on error
144 */
type_string_alloc(const char * type_str,u32 * count)145 void *type_string_alloc(const char *type_str, u32 *count)
146 {
147 void *data;
148 size_t size;
149
150 size = type_string_get_space_size(type_str);
151 if (!size)
152 return NULL;
153 data = malloc(size);
154 if (data)
155 *count = size;
156
157 return data;
158 }
159
160 /**
161 * Pack values defined by a type string into a buffer. The buffer must have
162 * large enough space.
163 *
164 * @param type_str type string
165 * @param values text strings of values to be packed
166 * @param data output buffer of values
167 * @return 0 on success, non-0 on error
168 */
type_string_pack(const char * type_str,char * const values[],u8 * data)169 int type_string_pack(const char *type_str, char * const values[],
170 u8 *data)
171 {
172 size_t offset;
173 u32 value;
174
175 for (offset = 0; *type_str; type_str++, values++) {
176 value = simple_strtoul(values[0], NULL, 0);
177 switch (*type_str) {
178 case 'b':
179 data[offset] = value;
180 offset += 1;
181 break;
182 case 'w':
183 put_unaligned_be16(value, data + offset);
184 offset += 2;
185 break;
186 case 'd':
187 put_unaligned_be32(value, data + offset);
188 offset += 4;
189 break;
190 default:
191 return -1;
192 }
193 }
194
195 return 0;
196 }
197
198 /**
199 * Read values defined by a type string from a buffer, and write these values
200 * to environment variables.
201 *
202 * @param type_str type string
203 * @param data input buffer of values
204 * @param vars names of environment variables
205 * @return 0 on success, non-0 on error
206 */
type_string_write_vars(const char * type_str,u8 * data,char * const vars[])207 int type_string_write_vars(const char *type_str, u8 *data,
208 char * const vars[])
209 {
210 size_t offset;
211 u32 value;
212
213 for (offset = 0; *type_str; type_str++, vars++) {
214 switch (*type_str) {
215 case 'b':
216 value = data[offset];
217 offset += 1;
218 break;
219 case 'w':
220 value = get_unaligned_be16(data + offset);
221 offset += 2;
222 break;
223 case 'd':
224 value = get_unaligned_be32(data + offset);
225 offset += 4;
226 break;
227 default:
228 return -1;
229 }
230 if (env_set_ulong(*vars, value))
231 return -1;
232 }
233
234 return 0;
235 }
236
tpm_show_device(void)237 static int tpm_show_device(void)
238 {
239 struct udevice *dev;
240 char buf[80];
241 int n = 0, rc;
242
243 for_each_tpm_device(dev) {
244 rc = tpm_get_desc(dev, buf, sizeof(buf));
245 if (rc < 0)
246 printf("device %d: can't get info\n", n);
247 else
248 printf("device %d: %s\n", n, buf);
249
250 n++;
251 };
252
253 return 0;
254 }
255
tpm_set_device(unsigned long num)256 static int tpm_set_device(unsigned long num)
257 {
258 struct udevice *dev;
259 unsigned long n = 0;
260 int rc = CMD_RET_FAILURE;
261
262 for_each_tpm_device(dev) {
263 if (n == num) {
264 rc = 0;
265 break;
266 }
267
268 n++;
269 }
270
271 if (!rc)
272 tpm_dev = dev;
273
274 return rc;
275 }
276
get_tpm(struct udevice ** devp)277 int get_tpm(struct udevice **devp)
278 {
279 int rc;
280
281 /*
282 * To keep a backward compatibility with previous code,
283 * if a tpm device is not explicitly set, we set the first one.
284 */
285 if (!tpm_dev) {
286 rc = tpm_set_device(0);
287 if (rc) {
288 printf("Couldn't set TPM 0 (rc = %d)\n", rc);
289 return CMD_RET_FAILURE;
290 }
291 }
292
293 if (devp)
294 *devp = tpm_dev;
295
296 return 0;
297 }
298
do_tpm_device(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])299 int do_tpm_device(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
300 {
301 unsigned long num;
302 int rc;
303
304 if (argc == 2) {
305 num = simple_strtoul(argv[1], NULL, 10);
306
307 rc = tpm_set_device(num);
308 if (rc)
309 printf("Couldn't set TPM %lu (rc = %d)\n", num, rc);
310 } else {
311 rc = tpm_show_device();
312 }
313
314 return rc;
315 }
316
do_tpm_info(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])317 int do_tpm_info(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
318 {
319 struct udevice *dev;
320 char buf[80];
321 int rc;
322
323 rc = get_tpm(&dev);
324 if (rc)
325 return rc;
326 rc = tpm_get_desc(dev, buf, sizeof(buf));
327 if (rc < 0) {
328 printf("Couldn't get TPM info (%d)\n", rc);
329 return CMD_RET_FAILURE;
330 }
331 printf("%s\n", buf);
332
333 return 0;
334 }
335
do_tpm_init(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])336 int do_tpm_init(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
337 {
338 struct udevice *dev;
339 int rc;
340
341 if (argc != 1)
342 return CMD_RET_USAGE;
343 rc = get_tpm(&dev);
344 if (rc)
345 return rc;
346
347 return report_return_code(tpm_init(dev));
348 }
349
do_tpm(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])350 int do_tpm(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
351 {
352 struct cmd_tbl *tpm_commands, *cmd;
353 struct tpm_chip_priv *priv;
354 struct udevice *dev;
355 unsigned int size;
356 int ret;
357
358 if (argc < 2)
359 return CMD_RET_USAGE;
360
361 ret = get_tpm(&dev);
362 if (ret)
363 return ret;
364
365 priv = dev_get_uclass_priv(dev);
366
367 /* Below getters return NULL if the desired stack is not built */
368 switch (priv->version) {
369 case TPM_V1:
370 tpm_commands = get_tpm1_commands(&size);
371 break;
372 case TPM_V2:
373 tpm_commands = get_tpm2_commands(&size);
374 break;
375 default:
376 tpm_commands = NULL;
377 }
378
379 if (!tpm_commands)
380 return CMD_RET_USAGE;
381
382 cmd = find_cmd_tbl(argv[1], tpm_commands, size);
383 if (!cmd)
384 return CMD_RET_USAGE;
385
386 return cmd->cmd(cmdtp, flag, argc - 1, argv + 1);
387 }
388