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|
/*
SSSD - digest functions - OpenSSL version
The calls defined here should be usable outside of SSSD as well, e.g. in
libsss_certmap.
Copyright (C) Sumit Bose <sbose@redhat.com> 2022
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <stdbool.h>
#include <talloc.h>
#include <openssl/opensslv.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include "lib/certmap/sss_certmap_int.h"
#if OPENSSL_VERSION_NUMBER < 0x30000000L
#define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
#define EVP_MD_free(ctx)
#define EVP_MD_fetch(ctx, algorithm, properties) discard_const(EVP_get_digestbyname(algorithm))
#endif
#define DATA_STEP_SIZE 30
struct get_digest_data {
const char **list;
size_t size;
size_t idx;
int error;
};
static void get_digest_helper(const OBJ_NAME *name, void *arg)
{
struct get_digest_data *data = (struct get_digest_data *) arg;
EVP_MD *md = NULL;
if (data->error != 0) {
return;
}
/* All digest names are expected to start with a lower case letter. For
* compatibility(?) with older version the digest list might contain some
* RSA based signature algorithms, e.g. RSA-SHA1, which should be ignored
* here. */
if (name == NULL || name->name == NULL || islower(*name->name) == 0
|| strstr(name->name, "RSA") != NULL
|| strstr(name->name, "rsa") != NULL) {
return;
}
/* check if digest can be fetched. */
md = EVP_MD_fetch(NULL, name->name, NULL);
if (md == NULL) {
return;
}
EVP_MD_free(md);
data->list[data->idx] = talloc_strdup(data->list, name->name);
if (data->list[data->idx] == NULL) {
data->error = ENOMEM;
return;
}
data->idx++;
if (data->idx == data->size - 1) {
data->size += DATA_STEP_SIZE;
data->list = talloc_realloc(data->list, data->list,
const char *, data->size);
if (data->list == NULL) {
data->error = ENOMEM;
return;
}
}
data->list[data->idx] = NULL;
}
int get_digest_list(TALLOC_CTX *mem_ctx, const char ***digest_list)
{
struct get_digest_data data = { 0 };
data.size = DATA_STEP_SIZE;
data.list = talloc_array(mem_ctx, const char *, data.size);
if (data.list == NULL) {
return ENOMEM;
}
OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS \
| OPENSSL_INIT_ADD_ALL_DIGESTS \
| OPENSSL_INIT_LOAD_CONFIG, NULL);
OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH, get_digest_helper, &data);
if (data.error != 0) {
talloc_free(data.list);
return data.error;
}
*digest_list = data.list;
return 0;
}
int get_hash(TALLOC_CTX *mem_ctx, const uint8_t *blob, size_t blob_size,
const char *digest, bool upper, bool colon, bool reverse,
char **out)
{
int ret;
EVP_MD *md = NULL;
unsigned char md_value[EVP_MAX_MD_SIZE];
unsigned int md_len;
char *tmp_str = NULL;
md = EVP_MD_fetch(NULL, digest, NULL);
if (md == NULL) {
return EINVAL;
}
ret = EVP_Digest(blob, blob_size, md_value, &md_len, md, NULL);
if (ret != 1) {
ret = EIO;
goto done;
}
ret = bin_to_hex(mem_ctx, upper, colon, reverse, md_value, md_len,
&tmp_str);
if (ret != 0) {
goto done;
}
*out = tmp_str;
ret = 0;
done:
if (ret != 0) {
talloc_free(tmp_str);
}
EVP_MD_free(md);
return ret;
}
|
