2 * Copyright (c) 2016 Netflix, Inc.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 #include <sys/cdefs.h>
28 #include <sys/efiio.h>
29 #include <sys/param.h>
38 static int efi_fd = -2;
40 #define Z { 0, 0, 0, 0, 0, { 0 } }
42 const efi_guid_t efi_guid_empty = Z;
44 static struct uuid_table guid_tbl [] =
46 { "00000000-0000-0000-0000-000000000000", "zero", Z },
47 { "093e0fae-a6c4-4f50-9f1b-d41e2b89c19a", "sha512", Z },
48 { "0abba7dc-e516-4167-bbf5-4d9d1c739416", "redhat", Z },
49 { "0b6e5233-a65c-44c9-9407-d9ab83bfc8bd", "sha224", Z },
50 { "126a762d-5758-4fca-8531-201a7f57f850", "lenovo_boot_menu", Z },
51 { "3bd2a492-96c0-4079-b420-fcf98ef103ed", "x509_sha256", Z },
52 { "3c5766e8-269c-4e34-aa14-ed776e85b3b6", "rsa2048", Z },
53 { "3CC24E96-22C7-41D8-8863-8E39DCDCC2CF", "lenovo", Z },
54 { "3f7e615b-0d45-4f80-88dc-26b234958560", "lenovo_diag", Z },
55 { "446dbf63-2502-4cda-bcfa-2465d2b0fe9d", "x509_sha512", Z },
56 { "4aafd29d-68df-49ee-8aa9-347d375665a7", "pkcs7_cert", Z },
57 { "605dab50-e046-4300-abb6-3dd810dd8b23", "shim", Z },
58 { "665d3f60-ad3e-4cad-8e26-db46eee9f1b5", "lenovo_rescue", Z },
59 { "67f8444f-8743-48f1-a328-1eaab8736080", "rsa2048_sha1", Z },
60 { "7076876e-80c2-4ee6-aad2-28b349a6865b", "x509_sha384", Z },
61 { "721c8b66-426c-4e86-8e99-3457c46ab0b9", "lenovo_setup", Z },
62 { "77fa9abd-0359-4d32-bd60-28f4e78f784b", "microsoft", Z },
63 { "7FACC7B6-127F-4E9C-9C5D-080F98994345", "lenovo_2", Z },
64 { "826ca512-cf10-4ac9-b187-be01496631bd", "sha1", Z },
65 { "82988420-7467-4490-9059-feb448dd1963", "lenovo_me_config", Z },
66 { "8be4df61-93ca-11d2-aa0d-00e098032b8c", "global", Z },
67 { "a5c059a1-94e4-4aa7-87b5-ab155c2bf072", "x509_cert", Z },
68 { "a7717414-c616-4977-9420-844712a735bf", "rsa2048_sha256_cert", Z },
69 { "a7d8d9a6-6ab0-4aeb-ad9d-163e59a7a380", "lenovo_diag_splash", Z },
70 { "ade9e48f-9cb8-98e6-31af-b4e6009e2fe3", "redhat_2", Z },
71 { "bc7838d2-0f82-4d60-8316-c068ee79d25b", "lenovo_msg", Z },
72 { "c1c41626-504c-4092-aca9-41f936934328", "sha256", Z },
73 { "c57ad6b7-0515-40a8-9d21-551652854e37", "shell", Z },
74 { "d719b2cb-3d3a-4596-a3bc-dad00e67656f", "security", Z },
75 { "e2b36190-879b-4a3d-ad8d-f2e7bba32784", "rsa2048_sha256", Z },
76 { "ff3e5307-9fd0-48c9-85f1-8ad56c701e01", "sha384", Z },
77 { "f46ee6f4-4785-43a3-923d-7f786c3c8479", "lenovo_startup_interrupt", Z },
78 { "ffffffff-ffff-ffff-ffff-ffffffffffff", "zzignore-this-guid", Z },
83 efi_guid_tbl_compile(void)
91 for (i = 0; i < nitems(guid_tbl); i++) {
92 uuid_from_string(guid_tbl[i].uuid_str, &guid_tbl[i].guid,
94 /* all f's is a bad version, so ignore that error */
95 if (status != uuid_s_ok && status != uuid_s_bad_version)
96 fprintf(stderr, "Can't convert %s to a uuid for %s: %d\n",
97 guid_tbl[i].uuid_str, guid_tbl[i].name, (int)status);
103 efi_known_guid(struct uuid_table **tbl)
107 return (nitems(guid_tbl));
115 efi_fd = open("/dev/efi", O_RDWR);
119 efi_guid_tbl_compile();
124 efi_var_reset(struct efi_var_ioc *var)
128 memset(&var->vendor, 0, sizeof(var->vendor));
135 rv_to_linux_rv(int rv)
145 efi_append_variable(efi_guid_t guid, const char *name,
146 uint8_t *data, size_t data_size, uint32_t attributes)
149 return efi_set_variable(guid, name, data, data_size,
150 attributes | EFI_VARIABLE_APPEND_WRITE);
154 efi_del_variable(efi_guid_t guid, const char *name)
157 /* data_size of 0 deletes the variable */
158 return efi_set_variable(guid, name, NULL, 0, 0);
162 efi_get_variable(efi_guid_t guid, const char *name,
163 uint8_t **data, size_t *data_size, uint32_t *attributes)
165 struct efi_var_ioc var;
167 static uint8_t buf[1024*32];
169 if (efi_open_dev() == -1)
173 rv = utf8_to_ucs2(name, &var.name, &var.namesize);
178 var.datasize = sizeof(buf);
179 rv = ioctl(efi_fd, EFIIOC_VAR_GET, &var);
180 if (data_size != NULL)
181 *data_size = var.datasize;
184 if (attributes != NULL)
185 *attributes = var.attrib;
189 return rv_to_linux_rv(rv);
193 efi_get_variable_attributes(efi_guid_t guid, const char *name,
194 uint32_t *attributes)
196 /* Make sure this construct works -- I think it will fail */
198 return efi_get_variable(guid, name, NULL, NULL, attributes);
202 efi_get_variable_size(efi_guid_t guid, const char *name,
206 /* XXX check to make sure this matches the linux value */
209 return efi_get_variable(guid, name, NULL, size, NULL);
213 efi_get_next_variable_name(efi_guid_t **guid, char **name)
215 struct efi_var_ioc var;
217 static efi_char *buf;
218 static size_t buflen = 256 * sizeof(efi_char);
219 static efi_guid_t retguid;
222 if (efi_open_dev() == -1)
226 * Always allocate enough for an extra NUL on the end, but don't tell
227 * the IOCTL about it so we can NUL terminate the name before converting
231 buf = malloc(buflen + sizeof(efi_char));
236 var.namesize = buflen;
239 /* GUID zeroed in var_reset */
241 rv = utf8_to_ucs2(*name, &var.name, &size);
246 rv = ioctl(efi_fd, EFIIOC_VAR_NEXT, &var);
247 if (rv == 0 && var.name == NULL) {
249 * Variable name not long enough, so allocate more space for the
250 * name and try again. As above, mind the NUL we add.
252 void *new = realloc(buf, var.namesize + sizeof(efi_char));
258 buflen = var.namesize;
264 free(*name); /* Free last name, to avoid leaking */
265 *name = NULL; /* Force ucs2_to_utf8 to malloc new space */
266 var.name[var.namesize / sizeof(efi_char)] = 0; /* EFI doesn't NUL terminate */
267 rv = ucs2_to_utf8(var.name, name);
270 retguid = var.vendor;
275 /* XXX The linux interface expects name to be a static buffer -- fix or leak memory? */
276 /* XXX for the moment, we free just before we'd leak, but still leak last one */
278 if (rv != 0 && errno == ENOENT) {
280 free(*name); /* Free last name, to avoid leaking */
284 return (rv_to_linux_rv(rv));
288 efi_guid_cmp(const efi_guid_t *guid1, const efi_guid_t *guid2)
292 return uuid_compare(guid1, guid2, &status);
296 efi_guid_is_zero(const efi_guid_t *guid)
300 return uuid_is_nil(guid, &status);
304 efi_guid_to_name(efi_guid_t *guid, char **name)
309 efi_guid_tbl_compile();
310 for (i = 0; i < nitems(guid_tbl); i++) {
311 if (uuid_equal(guid, &guid_tbl[i].guid, &status)) {
312 *name = strdup(guid_tbl[i].name);
316 return (efi_guid_to_str(guid, name));
320 efi_guid_to_symbol(efi_guid_t *guid __unused, char **symbol __unused)
324 * Unsure what this is used for, efibootmgr doesn't use it.
325 * Leave unimplemented for now.
331 efi_guid_to_str(const efi_guid_t *guid, char **sp)
335 /* knows efi_guid_t is a typedef of uuid_t */
336 uuid_to_string(guid, sp, &status);
338 return (status == uuid_s_ok ? 0 : -1);
342 efi_name_to_guid(const char *name, efi_guid_t *guid)
346 efi_guid_tbl_compile();
347 for (i = 0; i < nitems(guid_tbl); i++) {
348 if (strcmp(name, guid_tbl[i].name) == 0) {
349 *guid = guid_tbl[i].guid;
353 return (efi_str_to_guid(name, guid));
357 efi_set_variable(efi_guid_t guid, const char *name,
358 uint8_t *data, size_t data_size, uint32_t attributes)
360 struct efi_var_ioc var;
363 if (efi_open_dev() == -1)
367 rv = utf8_to_ucs2(name, &var.name, &var.namesize);
372 var.datasize = data_size;
373 var.attrib = attributes;
374 rv = ioctl(efi_fd, EFIIOC_VAR_SET, &var);
382 efi_str_to_guid(const char *s, efi_guid_t *guid)
386 /* knows efi_guid_t is a typedef of uuid_t */
387 uuid_from_string(s, guid, &status);
389 return (status == uuid_s_ok ? 0 : -1);
393 efi_variables_supported(void)
396 return efi_open_dev() != -1;