1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2005, 2012 IBM Corporation |
4 | * |
5 | * Authors: |
6 | * Kent Yoder <key@linux.vnet.ibm.com> |
7 | * Seiji Munetoh <munetoh@jp.ibm.com> |
8 | * Stefan Berger <stefanb@us.ibm.com> |
9 | * Reiner Sailer <sailer@watson.ibm.com> |
10 | * Kylene Hall <kjhall@us.ibm.com> |
11 | * Nayna Jain <nayna@linux.vnet.ibm.com> |
12 | * |
13 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
14 | * |
15 | * Access to the event log created by a system's firmware / BIOS |
16 | */ |
17 | |
18 | #include <linux/seq_file.h> |
19 | #include <linux/efi.h> |
20 | #include <linux/fs.h> |
21 | #include <linux/security.h> |
22 | #include <linux/module.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/tpm_eventlog.h> |
25 | |
26 | #include "../tpm.h" |
27 | #include "common.h" |
28 | |
29 | |
30 | static const char* tcpa_event_type_strings[] = { |
31 | "PREBOOT" , |
32 | "POST CODE" , |
33 | "" , |
34 | "NO ACTION" , |
35 | "SEPARATOR" , |
36 | "ACTION" , |
37 | "EVENT TAG" , |
38 | "S-CRTM Contents" , |
39 | "S-CRTM Version" , |
40 | "CPU Microcode" , |
41 | "Platform Config Flags" , |
42 | "Table of Devices" , |
43 | "Compact Hash" , |
44 | "IPL" , |
45 | "IPL Partition Data" , |
46 | "Non-Host Code" , |
47 | "Non-Host Config" , |
48 | "Non-Host Info" |
49 | }; |
50 | |
51 | static const char* tcpa_pc_event_id_strings[] = { |
52 | "" , |
53 | "SMBIOS" , |
54 | "BIS Certificate" , |
55 | "POST BIOS " , |
56 | "ESCD " , |
57 | "CMOS" , |
58 | "NVRAM" , |
59 | "Option ROM" , |
60 | "Option ROM config" , |
61 | "" , |
62 | "Option ROM microcode " , |
63 | "S-CRTM Version" , |
64 | "S-CRTM Contents " , |
65 | "POST Contents " , |
66 | "Table of Devices" , |
67 | }; |
68 | |
69 | /* returns pointer to start of pos. entry of tcg log */ |
70 | static void *tpm1_bios_measurements_start(struct seq_file *m, loff_t *pos) |
71 | { |
72 | loff_t i = 0; |
73 | struct tpm_chip *chip = m->private; |
74 | struct tpm_bios_log *log = &chip->log; |
75 | void *addr = log->bios_event_log; |
76 | void *limit = log->bios_event_log_end; |
77 | struct tcpa_event *event; |
78 | u32 converted_event_size; |
79 | u32 converted_event_type; |
80 | |
81 | /* read over *pos measurements */ |
82 | do { |
83 | event = addr; |
84 | |
85 | /* check if current entry is valid */ |
86 | if (addr + sizeof(struct tcpa_event) > limit) |
87 | return NULL; |
88 | |
89 | converted_event_size = |
90 | do_endian_conversion(event->event_size); |
91 | converted_event_type = |
92 | do_endian_conversion(event->event_type); |
93 | |
94 | if (((converted_event_type == 0) && (converted_event_size == 0)) |
95 | || ((addr + sizeof(struct tcpa_event) + converted_event_size) |
96 | > limit)) |
97 | return NULL; |
98 | |
99 | if (i++ == *pos) |
100 | break; |
101 | |
102 | addr += (sizeof(struct tcpa_event) + converted_event_size); |
103 | } while (1); |
104 | |
105 | return addr; |
106 | } |
107 | |
108 | static void *tpm1_bios_measurements_next(struct seq_file *m, void *v, |
109 | loff_t *pos) |
110 | { |
111 | struct tcpa_event *event = v; |
112 | struct tpm_chip *chip = m->private; |
113 | struct tpm_bios_log *log = &chip->log; |
114 | void *limit = log->bios_event_log_end; |
115 | u32 converted_event_size; |
116 | u32 converted_event_type; |
117 | |
118 | (*pos)++; |
119 | converted_event_size = do_endian_conversion(event->event_size); |
120 | |
121 | v += sizeof(struct tcpa_event) + converted_event_size; |
122 | |
123 | /* now check if current entry is valid */ |
124 | if ((v + sizeof(struct tcpa_event)) > limit) |
125 | return NULL; |
126 | |
127 | event = v; |
128 | |
129 | converted_event_size = do_endian_conversion(event->event_size); |
130 | converted_event_type = do_endian_conversion(event->event_type); |
131 | |
132 | if (((converted_event_type == 0) && (converted_event_size == 0)) || |
133 | ((v + sizeof(struct tcpa_event) + converted_event_size) > limit)) |
134 | return NULL; |
135 | |
136 | return v; |
137 | } |
138 | |
139 | static void tpm1_bios_measurements_stop(struct seq_file *m, void *v) |
140 | { |
141 | } |
142 | |
143 | static int get_event_name(char *dest, struct tcpa_event *event, |
144 | unsigned char * event_entry) |
145 | { |
146 | const char *name = "" ; |
147 | /* 41 so there is room for 40 data and 1 nul */ |
148 | char data[41] = "" ; |
149 | int i, n_len = 0, d_len = 0; |
150 | struct tcpa_pc_event *pc_event; |
151 | |
152 | switch (do_endian_conversion(event->event_type)) { |
153 | case PREBOOT: |
154 | case POST_CODE: |
155 | case UNUSED: |
156 | case NO_ACTION: |
157 | case SCRTM_CONTENTS: |
158 | case SCRTM_VERSION: |
159 | case CPU_MICROCODE: |
160 | case PLATFORM_CONFIG_FLAGS: |
161 | case TABLE_OF_DEVICES: |
162 | case COMPACT_HASH: |
163 | case IPL: |
164 | case IPL_PARTITION_DATA: |
165 | case NONHOST_CODE: |
166 | case NONHOST_CONFIG: |
167 | case NONHOST_INFO: |
168 | name = tcpa_event_type_strings[do_endian_conversion |
169 | (event->event_type)]; |
170 | n_len = strlen(name); |
171 | break; |
172 | case SEPARATOR: |
173 | case ACTION: |
174 | if (MAX_TEXT_EVENT > |
175 | do_endian_conversion(event->event_size)) { |
176 | name = event_entry; |
177 | n_len = do_endian_conversion(event->event_size); |
178 | } |
179 | break; |
180 | case EVENT_TAG: |
181 | pc_event = (struct tcpa_pc_event *)event_entry; |
182 | |
183 | /* ToDo Row data -> Base64 */ |
184 | |
185 | switch (do_endian_conversion(pc_event->event_id)) { |
186 | case SMBIOS: |
187 | case BIS_CERT: |
188 | case CMOS: |
189 | case NVRAM: |
190 | case OPTION_ROM_EXEC: |
191 | case OPTION_ROM_CONFIG: |
192 | case S_CRTM_VERSION: |
193 | name = tcpa_pc_event_id_strings[do_endian_conversion |
194 | (pc_event->event_id)]; |
195 | n_len = strlen(name); |
196 | break; |
197 | /* hash data */ |
198 | case POST_BIOS_ROM: |
199 | case ESCD: |
200 | case OPTION_ROM_MICROCODE: |
201 | case S_CRTM_CONTENTS: |
202 | case POST_CONTENTS: |
203 | name = tcpa_pc_event_id_strings[do_endian_conversion |
204 | (pc_event->event_id)]; |
205 | n_len = strlen(name); |
206 | for (i = 0; i < 20; i++) |
207 | d_len += sprintf(buf: &data[2*i], fmt: "%02x" , |
208 | pc_event->event_data[i]); |
209 | break; |
210 | default: |
211 | break; |
212 | } |
213 | break; |
214 | default: |
215 | break; |
216 | } |
217 | |
218 | return snprintf(buf: dest, MAX_TEXT_EVENT, fmt: "[%.*s%.*s]" , |
219 | n_len, name, d_len, data); |
220 | |
221 | } |
222 | |
223 | static int tpm1_binary_bios_measurements_show(struct seq_file *m, void *v) |
224 | { |
225 | struct tcpa_event *event = v; |
226 | struct tcpa_event temp_event; |
227 | char *temp_ptr; |
228 | int i; |
229 | |
230 | memcpy(&temp_event, event, sizeof(struct tcpa_event)); |
231 | |
232 | /* convert raw integers for endianness */ |
233 | temp_event.pcr_index = do_endian_conversion(event->pcr_index); |
234 | temp_event.event_type = do_endian_conversion(event->event_type); |
235 | temp_event.event_size = do_endian_conversion(event->event_size); |
236 | |
237 | temp_ptr = (char *) &temp_event; |
238 | |
239 | for (i = 0; i < (sizeof(struct tcpa_event) - 1) ; i++) |
240 | seq_putc(m, c: temp_ptr[i]); |
241 | |
242 | temp_ptr = (char *) v; |
243 | |
244 | for (i = (sizeof(struct tcpa_event) - 1); |
245 | i < (sizeof(struct tcpa_event) + temp_event.event_size); i++) |
246 | seq_putc(m, c: temp_ptr[i]); |
247 | |
248 | return 0; |
249 | |
250 | } |
251 | |
252 | static int tpm1_ascii_bios_measurements_show(struct seq_file *m, void *v) |
253 | { |
254 | char *eventname; |
255 | struct tcpa_event *event = v; |
256 | unsigned char *event_entry = |
257 | (unsigned char *)(v + sizeof(struct tcpa_event)); |
258 | |
259 | eventname = kmalloc(MAX_TEXT_EVENT, GFP_KERNEL); |
260 | if (!eventname) { |
261 | printk(KERN_ERR "%s: ERROR - No Memory for event name\n " , |
262 | __func__); |
263 | return -EFAULT; |
264 | } |
265 | |
266 | /* 1st: PCR */ |
267 | seq_printf(m, fmt: "%2d " , do_endian_conversion(event->pcr_index)); |
268 | |
269 | /* 2nd: SHA1 */ |
270 | seq_printf(m, fmt: "%20phN" , event->pcr_value); |
271 | |
272 | /* 3rd: event type identifier */ |
273 | seq_printf(m, fmt: " %02x" , do_endian_conversion(event->event_type)); |
274 | |
275 | get_event_name(dest: eventname, event, event_entry); |
276 | |
277 | /* 4th: eventname <= max + \'0' delimiter */ |
278 | seq_printf(m, fmt: " %s\n" , eventname); |
279 | |
280 | kfree(objp: eventname); |
281 | return 0; |
282 | } |
283 | |
284 | const struct seq_operations tpm1_ascii_b_measurements_seqops = { |
285 | .start = tpm1_bios_measurements_start, |
286 | .next = tpm1_bios_measurements_next, |
287 | .stop = tpm1_bios_measurements_stop, |
288 | .show = tpm1_ascii_bios_measurements_show, |
289 | }; |
290 | |
291 | const struct seq_operations tpm1_binary_b_measurements_seqops = { |
292 | .start = tpm1_bios_measurements_start, |
293 | .next = tpm1_bios_measurements_next, |
294 | .stop = tpm1_bios_measurements_stop, |
295 | .show = tpm1_binary_bios_measurements_show, |
296 | }; |
297 | |