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/* One way encryption based on SHA256 sum.
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Copyright (C) 2007-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2007.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/param.h>
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#include "sha256.h"
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#include "crypt-private.h"
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#ifdef USE_NSS
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typedef int PRBool;
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# include <hasht.h>
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# include <nsslowhash.h>
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# define sha256_init_ctx(ctxp, nss_ctxp) \
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do \
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{ \
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if (((nss_ctxp = NSSLOWHASH_NewContext (nss_ictx, HASH_AlgSHA256)) \
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== NULL)) \
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{ \
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if (nss_ctx != NULL) \
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NSSLOWHASH_Destroy (nss_ctx); \
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if (nss_alt_ctx != NULL) \
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NSSLOWHASH_Destroy (nss_alt_ctx); \
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return NULL; \
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} \
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NSSLOWHASH_Begin (nss_ctxp); \
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} \
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while (0)
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# define sha256_process_bytes(buf, len, ctxp, nss_ctxp) \
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NSSLOWHASH_Update (nss_ctxp, (const unsigned char *) buf, len)
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# define sha256_finish_ctx(ctxp, nss_ctxp, result) \
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do \
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{ \
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unsigned int ret; \
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NSSLOWHASH_End (nss_ctxp, result, &ret, sizeof (result)); \
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assert (ret == sizeof (result)); \
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NSSLOWHASH_Destroy (nss_ctxp); \
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nss_ctxp = NULL; \
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} \
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while (0)
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#else
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# define sha256_init_ctx(ctxp, nss_ctxp) \
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__sha256_init_ctx (ctxp)
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# define sha256_process_bytes(buf, len, ctxp, nss_ctxp) \
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__sha256_process_bytes(buf, len, ctxp)
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# define sha256_finish_ctx(ctxp, nss_ctxp, result) \
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__sha256_finish_ctx (ctxp, result)
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#endif
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/* Define our magic string to mark salt for SHA256 "encryption"
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replacement. */
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static const char sha256_salt_prefix[] = "$5$";
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/* Prefix for optional rounds specification. */
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static const char sha256_rounds_prefix[] = "rounds=";
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/* Maximum salt string length. */
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#define SALT_LEN_MAX 16
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/* Default number of rounds if not explicitly specified. */
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#define ROUNDS_DEFAULT 5000
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/* Minimum number of rounds. */
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#define ROUNDS_MIN 1000
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/* Maximum number of rounds. */
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#define ROUNDS_MAX 999999999
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/* Prototypes for local functions. */
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extern char *__sha256_crypt_r (const char *key, const char *salt,
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char *buffer, int buflen);
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extern char *__sha256_crypt (const char *key, const char *salt);
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char *
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__sha256_crypt_r (const char *key, const char *salt, char *buffer, int buflen)
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{
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unsigned char alt_result[32]
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__attribute__ ((__aligned__ (__alignof__ (uint32_t))));
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unsigned char temp_result[32]
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__attribute__ ((__aligned__ (__alignof__ (uint32_t))));
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size_t salt_len;
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size_t key_len;
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size_t cnt;
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char *cp;
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char *copied_key = NULL;
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char *copied_salt = NULL;
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char *p_bytes;
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char *s_bytes;
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/* Default number of rounds. */
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size_t rounds = ROUNDS_DEFAULT;
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bool rounds_custom = false;
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size_t alloca_used = 0;
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char *free_key = NULL;
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char *free_pbytes = NULL;
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/* Find beginning of salt string. The prefix should normally always
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be present. Just in case it is not. */
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if (strncmp (sha256_salt_prefix, salt, sizeof (sha256_salt_prefix) - 1) == 0)
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/* Skip salt prefix. */
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salt += sizeof (sha256_salt_prefix) - 1;
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if (strncmp (salt, sha256_rounds_prefix, sizeof (sha256_rounds_prefix) - 1)
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== 0)
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{
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const char *num = salt + sizeof (sha256_rounds_prefix) - 1;
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char *endp;
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unsigned long int srounds = strtoul (num, &endp, 10);
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if (*endp == '$')
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{
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salt = endp + 1;
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rounds = MAX (ROUNDS_MIN, MIN (srounds, ROUNDS_MAX));
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rounds_custom = true;
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}
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}
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salt_len = MIN (strcspn (salt, "$"), SALT_LEN_MAX);
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key_len = strlen (key);
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if ((key - (char *) 0) % __alignof__ (uint32_t) != 0)
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{
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char *tmp;
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if (__libc_use_alloca (alloca_used + key_len + __alignof__ (uint32_t)))
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tmp = alloca_account (key_len + __alignof__ (uint32_t), alloca_used);
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else
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{
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free_key = tmp = (char *) malloc (key_len + __alignof__ (uint32_t));
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if (tmp == NULL)
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return NULL;
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}
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key = copied_key =
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memcpy (tmp + __alignof__ (uint32_t)
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- (tmp - (char *) 0) % __alignof__ (uint32_t),
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key, key_len);
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assert ((key - (char *) 0) % __alignof__ (uint32_t) == 0);
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}
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if ((salt - (char *) 0) % __alignof__ (uint32_t) != 0)
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{
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char *tmp = (char *) alloca (salt_len + __alignof__ (uint32_t));
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alloca_used += salt_len + __alignof__ (uint32_t);
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salt = copied_salt =
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memcpy (tmp + __alignof__ (uint32_t)
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- (tmp - (char *) 0) % __alignof__ (uint32_t),
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salt, salt_len);
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assert ((salt - (char *) 0) % __alignof__ (uint32_t) == 0);
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}
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#ifdef USE_NSS
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/* Initialize libfreebl3. */
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NSSLOWInitContext *nss_ictx = NSSLOW_Init ();
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if (nss_ictx == NULL)
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{
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free (free_key);
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return NULL;
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}
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NSSLOWHASHContext *nss_ctx = NULL;
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NSSLOWHASHContext *nss_alt_ctx = NULL;
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#else
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struct sha256_ctx ctx;
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struct sha256_ctx alt_ctx;
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#endif
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/* Prepare for the real work. */
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sha256_init_ctx (&ctx, nss_ctx);
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/* Add the key string. */
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sha256_process_bytes (key, key_len, &ctx, nss_ctx);
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/* The last part is the salt string. This must be at most 16
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characters and it ends at the first `$' character. */
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sha256_process_bytes (salt, salt_len, &ctx, nss_ctx);
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/* Compute alternate SHA256 sum with input KEY, SALT, and KEY. The
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final result will be added to the first context. */
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sha256_init_ctx (&alt_ctx, nss_alt_ctx);
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/* Add key. */
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sha256_process_bytes (key, key_len, &alt_ctx, nss_alt_ctx);
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/* Add salt. */
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sha256_process_bytes (salt, salt_len, &alt_ctx, nss_alt_ctx);
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/* Add key again. */
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sha256_process_bytes (key, key_len, &alt_ctx, nss_alt_ctx);
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/* Now get result of this (32 bytes) and add it to the other
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context. */
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sha256_finish_ctx (&alt_ctx, nss_alt_ctx, alt_result);
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/* Add for any character in the key one byte of the alternate sum. */
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for (cnt = key_len; cnt > 32; cnt -= 32)
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sha256_process_bytes (alt_result, 32, &ctx, nss_ctx);
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sha256_process_bytes (alt_result, cnt, &ctx, nss_ctx);
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/* Take the binary representation of the length of the key and for every
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1 add the alternate sum, for every 0 the key. */
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for (cnt = key_len; cnt > 0; cnt >>= 1)
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if ((cnt & 1) != 0)
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sha256_process_bytes (alt_result, 32, &ctx, nss_ctx);
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else
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sha256_process_bytes (key, key_len, &ctx, nss_ctx);
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/* Create intermediate result. */
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sha256_finish_ctx (&ctx, nss_ctx, alt_result);
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/* Start computation of P byte sequence. */
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sha256_init_ctx (&alt_ctx, nss_alt_ctx);
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/* For every character in the password add the entire password. */
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for (cnt = 0; cnt < key_len; ++cnt)
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sha256_process_bytes (key, key_len, &alt_ctx, nss_alt_ctx);
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/* Finish the digest. */
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sha256_finish_ctx (&alt_ctx, nss_alt_ctx, temp_result);
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/* Create byte sequence P. */
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if (__libc_use_alloca (alloca_used + key_len))
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cp = p_bytes = (char *) alloca (key_len);
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else
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{
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free_pbytes = cp = p_bytes = (char *)malloc (key_len);
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if (free_pbytes == NULL)
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{
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free (free_key);
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return NULL;
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}
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}
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for (cnt = key_len; cnt >= 32; cnt -= 32)
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cp = mempcpy (cp, temp_result, 32);
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memcpy (cp, temp_result, cnt);
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/* Start computation of S byte sequence. */
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sha256_init_ctx (&alt_ctx, nss_alt_ctx);
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/* For every character in the password add the entire password. */
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for (cnt = 0; cnt < 16 + alt_result[0]; ++cnt)
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sha256_process_bytes (salt, salt_len, &alt_ctx, nss_alt_ctx);
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/* Finish the digest. */
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sha256_finish_ctx (&alt_ctx, nss_alt_ctx, temp_result);
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/* Create byte sequence S. */
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cp = s_bytes = alloca (salt_len);
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for (cnt = salt_len; cnt >= 32; cnt -= 32)
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cp = mempcpy (cp, temp_result, 32);
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memcpy (cp, temp_result, cnt);
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/* Repeatedly run the collected hash value through SHA256 to burn
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CPU cycles. */
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for (cnt = 0; cnt < rounds; ++cnt)
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{
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/* New context. */
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6c4009 |
sha256_init_ctx (&ctx, nss_ctx);
|
|
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6c4009 |
|
|
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6c4009 |
/* Add key or last result. */
|
|
Packit |
6c4009 |
if ((cnt & 1) != 0)
|
|
Packit |
6c4009 |
sha256_process_bytes (p_bytes, key_len, &ctx, nss_ctx);
|
|
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6c4009 |
else
|
|
Packit |
6c4009 |
sha256_process_bytes (alt_result, 32, &ctx, nss_ctx);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Add salt for numbers not divisible by 3. */
|
|
Packit |
6c4009 |
if (cnt % 3 != 0)
|
|
Packit |
6c4009 |
sha256_process_bytes (s_bytes, salt_len, &ctx, nss_ctx);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Add key for numbers not divisible by 7. */
|
|
Packit |
6c4009 |
if (cnt % 7 != 0)
|
|
Packit |
6c4009 |
sha256_process_bytes (p_bytes, key_len, &ctx, nss_ctx);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Add key or last result. */
|
|
Packit |
6c4009 |
if ((cnt & 1) != 0)
|
|
Packit |
6c4009 |
sha256_process_bytes (alt_result, 32, &ctx, nss_ctx);
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
sha256_process_bytes (p_bytes, key_len, &ctx, nss_ctx);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Create intermediate result. */
|
|
Packit |
6c4009 |
sha256_finish_ctx (&ctx, nss_ctx, alt_result);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifdef USE_NSS
|
|
Packit |
6c4009 |
/* Free libfreebl3 resources. */
|
|
Packit |
6c4009 |
NSSLOW_Shutdown (nss_ictx);
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Now we can construct the result string. It consists of three
|
|
Packit |
6c4009 |
parts. */
|
|
Packit |
6c4009 |
cp = __stpncpy (buffer, sha256_salt_prefix, MAX (0, buflen));
|
|
Packit |
6c4009 |
buflen -= sizeof (sha256_salt_prefix) - 1;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (rounds_custom)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
int n = __snprintf (cp, MAX (0, buflen), "%s%zu$",
|
|
Packit |
6c4009 |
sha256_rounds_prefix, rounds);
|
|
Packit |
6c4009 |
cp += n;
|
|
Packit |
6c4009 |
buflen -= n;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
cp = __stpncpy (cp, salt, MIN ((size_t) MAX (0, buflen), salt_len));
|
|
Packit |
6c4009 |
buflen -= MIN ((size_t) MAX (0, buflen), salt_len);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (buflen > 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*cp++ = '$';
|
|
Packit |
6c4009 |
--buflen;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[0], alt_result[10], alt_result[20], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[21], alt_result[1], alt_result[11], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[12], alt_result[22], alt_result[2], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[3], alt_result[13], alt_result[23], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[24], alt_result[4], alt_result[14], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[15], alt_result[25], alt_result[5], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[6], alt_result[16], alt_result[26], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[27], alt_result[7], alt_result[17], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[18], alt_result[28], alt_result[8], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
alt_result[9], alt_result[19], alt_result[29], 4);
|
|
Packit |
6c4009 |
__b64_from_24bit (&cp, &buflen,
|
|
Packit |
6c4009 |
0, alt_result[31], alt_result[30], 3);
|
|
Packit |
6c4009 |
if (buflen <= 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
__set_errno (ERANGE);
|
|
Packit |
6c4009 |
buffer = NULL;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
*cp = '\0'; /* Terminate the string. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Clear the buffer for the intermediate result so that people
|
|
Packit |
6c4009 |
attaching to processes or reading core dumps cannot get any
|
|
Packit |
6c4009 |
information. We do it in this way to clear correct_words[]
|
|
Packit |
6c4009 |
inside the SHA256 implementation as well. */
|
|
Packit |
6c4009 |
#ifndef USE_NSS
|
|
Packit |
6c4009 |
__sha256_init_ctx (&ctx;;
|
|
Packit |
6c4009 |
__sha256_finish_ctx (&ctx, alt_result);
|
|
Packit |
6c4009 |
explicit_bzero (&ctx, sizeof (ctx));
|
|
Packit |
6c4009 |
explicit_bzero (&alt_ctx, sizeof (alt_ctx));
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
explicit_bzero (temp_result, sizeof (temp_result));
|
|
Packit |
6c4009 |
explicit_bzero (p_bytes, key_len);
|
|
Packit |
6c4009 |
explicit_bzero (s_bytes, salt_len);
|
|
Packit |
6c4009 |
if (copied_key != NULL)
|
|
Packit |
6c4009 |
explicit_bzero (copied_key, key_len);
|
|
Packit |
6c4009 |
if (copied_salt != NULL)
|
|
Packit |
6c4009 |
explicit_bzero (copied_salt, salt_len);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
free (free_key);
|
|
Packit |
6c4009 |
free (free_pbytes);
|
|
Packit |
6c4009 |
return buffer;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifndef _LIBC
|
|
Packit |
6c4009 |
# define libc_freeres_ptr(decl) decl
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
libc_freeres_ptr (static char *buffer);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* This entry point is equivalent to the `crypt' function in Unix
|
|
Packit |
6c4009 |
libcs. */
|
|
Packit |
6c4009 |
char *
|
|
Packit |
6c4009 |
__sha256_crypt (const char *key, const char *salt)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* We don't want to have an arbitrary limit in the size of the
|
|
Packit |
6c4009 |
password. We can compute an upper bound for the size of the
|
|
Packit |
6c4009 |
result in advance and so we can prepare the buffer we pass to
|
|
Packit |
6c4009 |
`sha256_crypt_r'. */
|
|
Packit |
6c4009 |
static int buflen;
|
|
Packit |
6c4009 |
int needed = (sizeof (sha256_salt_prefix) - 1
|
|
Packit |
6c4009 |
+ sizeof (sha256_rounds_prefix) + 9 + 1
|
|
Packit |
6c4009 |
+ strlen (salt) + 1 + 43 + 1);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (buflen < needed)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
char *new_buffer = (char *) realloc (buffer, needed);
|
|
Packit |
6c4009 |
if (new_buffer == NULL)
|
|
Packit |
6c4009 |
return NULL;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
buffer = new_buffer;
|
|
Packit |
6c4009 |
buflen = needed;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return __sha256_crypt_r (key, salt, buffer, buflen);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifndef _LIBC
|
|
Packit |
6c4009 |
static void
|
|
Packit |
6c4009 |
__attribute__ ((__destructor__))
|
|
Packit |
6c4009 |
free_mem (void)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
free (buffer);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
#endif
|