2 * Copyright (c) 2016 Netflix, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 #include <sys/efiio.h>
32 #include <sys/param.h>
41 static int efi_fd = -2;
43 #define Z { 0, 0, 0, 0, 0, { 0 } }
45 const efi_guid_t efi_guid_empty = Z;
47 static struct uuid_table guid_tbl [] =
49 { "00000000-0000-0000-0000-000000000000", "zero", Z },
50 { "093e0fae-a6c4-4f50-9f1b-d41e2b89c19a", "sha512", Z },
51 { "0abba7dc-e516-4167-bbf5-4d9d1c739416", "redhat", Z },
52 { "0b6e5233-a65c-44c9-9407-d9ab83bfc8bd", "sha224", Z },
53 { "126a762d-5758-4fca-8531-201a7f57f850", "lenovo_boot_menu", Z },
54 { "3bd2a492-96c0-4079-b420-fcf98ef103ed", "x509_sha256", Z },
55 { "3c5766e8-269c-4e34-aa14-ed776e85b3b6", "rsa2048", Z },
56 { "3CC24E96-22C7-41D8-8863-8E39DCDCC2CF", "lenovo", Z },
57 { "3f7e615b-0d45-4f80-88dc-26b234958560", "lenovo_diag", Z },
58 { "446dbf63-2502-4cda-bcfa-2465d2b0fe9d", "x509_sha512", Z },
59 { "4aafd29d-68df-49ee-8aa9-347d375665a7", "pkcs7_cert", Z },
60 { "605dab50-e046-4300-abb6-3dd810dd8b23", "shim", Z },
61 { "665d3f60-ad3e-4cad-8e26-db46eee9f1b5", "lenovo_rescue", Z },
62 { "67f8444f-8743-48f1-a328-1eaab8736080", "rsa2048_sha1", Z },
63 { "7076876e-80c2-4ee6-aad2-28b349a6865b", "x509_sha384", Z },
64 { "721c8b66-426c-4e86-8e99-3457c46ab0b9", "lenovo_setup", Z },
65 { "77fa9abd-0359-4d32-bd60-28f4e78f784b", "microsoft", Z },
66 { "7FACC7B6-127F-4E9C-9C5D-080F98994345", "lenovo_2", Z },
67 { "826ca512-cf10-4ac9-b187-be01496631bd", "sha1", Z },
68 { "82988420-7467-4490-9059-feb448dd1963", "lenovo_me_config", Z },
69 { "8be4df61-93ca-11d2-aa0d-00e098032b8c", "global", Z },
70 { "a5c059a1-94e4-4aa7-87b5-ab155c2bf072", "x509_cert", Z },
71 { "a7717414-c616-4977-9420-844712a735bf", "rsa2048_sha256_cert", Z },
72 { "a7d8d9a6-6ab0-4aeb-ad9d-163e59a7a380", "lenovo_diag_splash", Z },
73 { "ade9e48f-9cb8-98e6-31af-b4e6009e2fe3", "redhat_2", Z },
74 { "bc7838d2-0f82-4d60-8316-c068ee79d25b", "lenovo_msg", Z },
75 { "c1c41626-504c-4092-aca9-41f936934328", "sha256", Z },
76 { "c57ad6b7-0515-40a8-9d21-551652854e37", "shell", Z },
77 { "d719b2cb-3d3a-4596-a3bc-dad00e67656f", "security", Z },
78 { "e2b36190-879b-4a3d-ad8d-f2e7bba32784", "rsa2048_sha256", Z },
79 { "ff3e5307-9fd0-48c9-85f1-8ad56c701e01", "sha384", Z },
80 { "f46ee6f4-4785-43a3-923d-7f786c3c8479", "lenovo_startup_interrupt", Z },
81 { "ffffffff-ffff-ffff-ffff-ffffffffffff", "zzignore-this-guid", Z },
86 efi_guid_tbl_compile(void)
94 for (i = 0; i < nitems(guid_tbl); i++) {
95 uuid_from_string(guid_tbl[i].uuid_str, &guid_tbl[i].guid,
97 /* all f's is a bad version, so ignore that error */
98 if (status != uuid_s_ok && status != uuid_s_bad_version)
99 fprintf(stderr, "Can't convert %s to a uuid for %s: %d\n",
100 guid_tbl[i].uuid_str, guid_tbl[i].name, (int)status);
106 efi_known_guid(struct uuid_table **tbl)
110 return (nitems(guid_tbl));
118 efi_fd = open("/dev/efi", O_RDWR);
122 efi_guid_tbl_compile();
127 efi_var_reset(struct efi_var_ioc *var)
131 memset(&var->vendor, 0, sizeof(var->vendor));
138 rv_to_linux_rv(int rv)
148 efi_append_variable(efi_guid_t guid, const char *name,
149 uint8_t *data, size_t data_size, uint32_t attributes)
152 return efi_set_variable(guid, name, data, data_size,
153 attributes | EFI_VARIABLE_APPEND_WRITE);
157 efi_del_variable(efi_guid_t guid, const char *name)
160 /* data_size of 0 deletes the variable */
161 return efi_set_variable(guid, name, NULL, 0, 0);
165 efi_get_variable(efi_guid_t guid, const char *name,
166 uint8_t **data, size_t *data_size, uint32_t *attributes)
168 struct efi_var_ioc var;
170 static uint8_t buf[1024*32];
172 if (efi_open_dev() == -1)
176 rv = utf8_to_ucs2(name, &var.name, &var.namesize);
181 var.datasize = sizeof(buf);
182 rv = ioctl(efi_fd, EFIIOC_VAR_GET, &var);
183 if (data_size != NULL)
184 *data_size = var.datasize;
187 if (attributes != NULL)
188 *attributes = var.attrib;
192 return rv_to_linux_rv(rv);
196 efi_get_variable_attributes(efi_guid_t guid, const char *name,
197 uint32_t *attributes)
199 /* Make sure this construct works -- I think it will fail */
201 return efi_get_variable(guid, name, NULL, NULL, attributes);
205 efi_get_variable_size(efi_guid_t guid, const char *name,
209 /* XXX check to make sure this matches the linux value */
212 return efi_get_variable(guid, name, NULL, size, NULL);
216 efi_get_next_variable_name(efi_guid_t **guid, char **name)
218 struct efi_var_ioc var;
220 static efi_char *buf;
221 static size_t buflen = 256 * sizeof(efi_char);
222 static efi_guid_t retguid;
225 if (efi_open_dev() == -1)
229 * Always allocate enough for an extra NUL on the end, but don't tell
230 * the IOCTL about it so we can NUL terminate the name before converting
234 buf = malloc(buflen + sizeof(efi_char));
239 var.namesize = buflen;
242 /* GUID zeroed in var_reset */
244 rv = utf8_to_ucs2(*name, &var.name, &size);
249 rv = ioctl(efi_fd, EFIIOC_VAR_NEXT, &var);
250 if (rv == 0 && var.name == NULL) {
252 * Variable name not long enough, so allocate more space for the
253 * name and try again. As above, mind the NUL we add.
255 void *new = realloc(buf, var.namesize + sizeof(efi_char));
261 buflen = var.namesize;
267 free(*name); /* Free last name, to avoid leaking */
268 *name = NULL; /* Force ucs2_to_utf8 to malloc new space */
269 var.name[var.namesize / sizeof(efi_char)] = 0; /* EFI doesn't NUL terminate */
270 rv = ucs2_to_utf8(var.name, name);
273 retguid = var.vendor;
278 /* XXX The linux interface expects name to be a static buffer -- fix or leak memory? */
279 /* XXX for the moment, we free just before we'd leak, but still leak last one */
281 if (rv != 0 && errno == ENOENT) {
283 free(*name); /* Free last name, to avoid leaking */
287 return (rv_to_linux_rv(rv));
291 efi_guid_cmp(const efi_guid_t *guid1, const efi_guid_t *guid2)
295 return uuid_compare(guid1, guid2, &status);
299 efi_guid_is_zero(const efi_guid_t *guid)
303 return uuid_is_nil(guid, &status);
307 efi_guid_to_name(efi_guid_t *guid, char **name)
312 efi_guid_tbl_compile();
313 for (i = 0; i < nitems(guid_tbl); i++) {
314 if (uuid_equal(guid, &guid_tbl[i].guid, &status)) {
315 *name = strdup(guid_tbl[i].name);
319 return (efi_guid_to_str(guid, name));
323 efi_guid_to_symbol(efi_guid_t *guid __unused, char **symbol __unused)
327 * Unsure what this is used for, efibootmgr doesn't use it.
328 * Leave unimplemented for now.
334 efi_guid_to_str(const efi_guid_t *guid, char **sp)
338 /* knows efi_guid_t is a typedef of uuid_t */
339 uuid_to_string(guid, sp, &status);
341 return (status == uuid_s_ok ? 0 : -1);
345 efi_name_to_guid(const char *name, efi_guid_t *guid)
349 efi_guid_tbl_compile();
350 for (i = 0; i < nitems(guid_tbl); i++) {
351 if (strcmp(name, guid_tbl[i].name) == 0) {
352 *guid = guid_tbl[i].guid;
356 return (efi_str_to_guid(name, guid));
360 efi_set_variable(efi_guid_t guid, const char *name,
361 uint8_t *data, size_t data_size, uint32_t attributes)
363 struct efi_var_ioc var;
366 if (efi_open_dev() == -1)
370 rv = utf8_to_ucs2(name, &var.name, &var.namesize);
375 var.datasize = data_size;
376 var.attrib = attributes;
377 rv = ioctl(efi_fd, EFIIOC_VAR_SET, &var);
385 efi_str_to_guid(const char *s, efi_guid_t *guid)
389 /* knows efi_guid_t is a typedef of uuid_t */
390 uuid_from_string(s, guid, &status);
392 return (status == uuid_s_ok ? 0 : -1);
396 efi_variables_supported(void)
399 return efi_open_dev() != -1;