crypt: Remove libcrypt support

All the crypt related functions, cryptographic algorithms, and
make requirements are removed,  with only the exception of md5
implementation which is moved to locale folder since it is
required by localedef for integrity protection (libc's
locale-reading code does not check these, but localedef does
generate them).

Besides thec code itself, both internal documentation and the
manual is also adjusted.  This allows to remove both --enable-crypt
and --enable-nss-crypt configure options.

Checked with a build for all affected ABIs.

Co-authored-by: Zack Weinberg <zack@owlfolio.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 0 insertions, 445 deletions

diff --git a/crypt/sha512-crypt.c b/crypt/sha512-crypt.c
deleted file mode 100644
index d9c0de14d2..0000000000
--- a/crypt/sha512-crypt.c
+++ /dev/null
@@ -1,445 +0,0 @@
-/* One way encryption based on SHA512 sum.
-   Copyright (C) 2007-2023 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <assert.h>
-#include <errno.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdint.h>
-#include <sys/param.h>
-
-#include "sha512.h"
-#include "crypt-private.h"
-
-
-#ifdef USE_NSS
-typedef int PRBool;
-# include <hasht.h>
-# include <nsslowhash.h>
-
-# define sha512_init_ctx(ctxp, nss_ctxp) \
-  do									      \
-    {									      \
-      if (((nss_ctxp = NSSLOWHASH_NewContext (nss_ictx, HASH_AlgSHA512))      \
-	   == NULL))							      \
-	{								      \
-	  if (nss_ctx != NULL)						      \
-	    NSSLOWHASH_Destroy (nss_ctx);				      \
-	  if (nss_alt_ctx != NULL)					      \
-	    NSSLOWHASH_Destroy (nss_alt_ctx);				      \
-	  return NULL;							      \
-	}								      \
-      NSSLOWHASH_Begin (nss_ctxp);					      \
-    }									      \
-  while (0)
-
-# define sha512_process_bytes(buf, len, ctxp, nss_ctxp) \
-  NSSLOWHASH_Update (nss_ctxp, (const unsigned char *) buf, len)
-
-# define sha512_finish_ctx(ctxp, nss_ctxp, result) \
-  do									      \
-    {									      \
-      unsigned int ret;							      \
-      NSSLOWHASH_End (nss_ctxp, result, &ret, sizeof (result));		      \
-      assert (ret == sizeof (result));					      \
-      NSSLOWHASH_Destroy (nss_ctxp);					      \
-      nss_ctxp = NULL;							      \
-    }									      \
-  while (0)
-#else
-# define sha512_init_ctx(ctxp, nss_ctxp) \
-  __sha512_init_ctx (ctxp)
-
-# define sha512_process_bytes(buf, len, ctxp, nss_ctxp) \
-  __sha512_process_bytes(buf, len, ctxp)
-
-# define sha512_finish_ctx(ctxp, nss_ctxp, result) \
-  __sha512_finish_ctx (ctxp, result)
-#endif
-
-
-/* Define our magic string to mark salt for SHA512 "encryption"
-   replacement.  */
-static const char sha512_salt_prefix[] = "$6$";
-
-/* Prefix for optional rounds specification.  */
-static const char sha512_rounds_prefix[] = "rounds=";
-
-/* Maximum salt string length.  */
-#define SALT_LEN_MAX 16
-/* Default number of rounds if not explicitly specified.  */
-#define ROUNDS_DEFAULT 5000
-/* Minimum number of rounds.  */
-#define ROUNDS_MIN 1000
-/* Maximum number of rounds.  */
-#define ROUNDS_MAX 999999999
-
-
-/* Prototypes for local functions.  */
-extern char *__sha512_crypt_r (const char *key, const char *salt,
-			       char *buffer, int buflen);
-extern char *__sha512_crypt (const char *key, const char *salt);
-
-
-char *
-__sha512_crypt_r (const char *key, const char *salt, char *buffer, int buflen)
-{
-  unsigned char alt_result[64]
-    __attribute__ ((__aligned__ (__alignof__ (uint64_t))));
-  unsigned char temp_result[64]
-    __attribute__ ((__aligned__ (__alignof__ (uint64_t))));
-  size_t salt_len;
-  size_t key_len;
-  size_t cnt;
-  char *cp;
-  char *copied_key = NULL;
-  char *copied_salt = NULL;
-  char *p_bytes;
-  char *s_bytes;
-  /* Default number of rounds.  */
-  size_t rounds = ROUNDS_DEFAULT;
-  bool rounds_custom = false;
-  size_t alloca_used = 0;
-  char *free_key = NULL;
-  char *free_pbytes = NULL;
-
-  /* Find beginning of salt string.  The prefix should normally always
-     be present.  Just in case it is not.  */
-  if (strncmp (sha512_salt_prefix, salt, sizeof (sha512_salt_prefix) - 1) == 0)
-    /* Skip salt prefix.  */
-    salt += sizeof (sha512_salt_prefix) - 1;
-
-  if (strncmp (salt, sha512_rounds_prefix, sizeof (sha512_rounds_prefix) - 1)
-      == 0)
-    {
-      const char *num = salt + sizeof (sha512_rounds_prefix) - 1;
-      char *endp;
-      unsigned long int srounds = strtoul (num, &endp, 10);
-      if (*endp == '$')
-	{
-	  salt = endp + 1;
-	  rounds = MAX (ROUNDS_MIN, MIN (srounds, ROUNDS_MAX));
-	  rounds_custom = true;
-	}
-    }
-
-  salt_len = MIN (strcspn (salt, "$"), SALT_LEN_MAX);
-  key_len = strlen (key);
-
-  if (((uintptr_t) key) % __alignof__ (uint64_t) != 0)
-    {
-      char *tmp;
-
-      if (__libc_use_alloca (alloca_used + key_len + __alignof__ (uint64_t)))
-	tmp = alloca_account (key_len + __alignof__ (uint64_t), alloca_used);
-      else
-	{
-	  free_key = tmp = (char *) malloc (key_len + __alignof__ (uint64_t));
-	  if (tmp == NULL)
-	    return NULL;
-	}
-
-      key = copied_key =
-	memcpy (tmp + __alignof__ (uint64_t)
-		- ((uintptr_t) tmp) % __alignof__ (uint64_t),
-		key, key_len);
-      assert (((uintptr_t) key) % __alignof__ (uint64_t) == 0);
-    }
-
-  if (((uintptr_t) salt) % __alignof__ (uint64_t) != 0)
-    {
-      char *tmp = (char *) alloca (salt_len + __alignof__ (uint64_t));
-      salt = copied_salt =
-	memcpy (tmp + __alignof__ (uint64_t)
-		- ((uintptr_t) tmp) % __alignof__ (uint64_t),
-		salt, salt_len);
-      assert (((uintptr_t) salt) % __alignof__ (uint64_t) == 0);
-    }
-
-#ifdef USE_NSS
-  /* Initialize libfreebl3.  */
-  NSSLOWInitContext *nss_ictx = NSSLOW_Init ();
-  if (nss_ictx == NULL)
-    {
-      free (free_key);
-      return NULL;
-    }
-  NSSLOWHASHContext *nss_ctx = NULL;
-  NSSLOWHASHContext *nss_alt_ctx = NULL;
-#else
-  struct sha512_ctx ctx;
-  struct sha512_ctx alt_ctx;
-#endif
-
-  /* Prepare for the real work.  */
-  sha512_init_ctx (&ctx, nss_ctx);
-
-  /* Add the key string.  */
-  sha512_process_bytes (key, key_len, &ctx, nss_ctx);
-
-  /* The last part is the salt string.  This must be at most 16
-     characters and it ends at the first `$' character.  */
-  sha512_process_bytes (salt, salt_len, &ctx, nss_ctx);
-
-
-  /* Compute alternate SHA512 sum with input KEY, SALT, and KEY.  The
-     final result will be added to the first context.  */
-  sha512_init_ctx (&alt_ctx, nss_alt_ctx);
-
-  /* Add key.  */
-  sha512_process_bytes (key, key_len, &alt_ctx, nss_alt_ctx);
-
-  /* Add salt.  */
-  sha512_process_bytes (salt, salt_len, &alt_ctx, nss_alt_ctx);
-
-  /* Add key again.  */
-  sha512_process_bytes (key, key_len, &alt_ctx, nss_alt_ctx);
-
-  /* Now get result of this (64 bytes) and add it to the other
-     context.  */
-  sha512_finish_ctx (&alt_ctx, nss_alt_ctx, alt_result);
-
-  /* Add for any character in the key one byte of the alternate sum.  */
-  for (cnt = key_len; cnt > 64; cnt -= 64)
-    sha512_process_bytes (alt_result, 64, &ctx, nss_ctx);
-  sha512_process_bytes (alt_result, cnt, &ctx, nss_ctx);
-
-  /* Take the binary representation of the length of the key and for every
-     1 add the alternate sum, for every 0 the key.  */
-  for (cnt = key_len; cnt > 0; cnt >>= 1)
-    if ((cnt & 1) != 0)
-      sha512_process_bytes (alt_result, 64, &ctx, nss_ctx);
-    else
-      sha512_process_bytes (key, key_len, &ctx, nss_ctx);
-
-  /* Create intermediate result.  */
-  sha512_finish_ctx (&ctx, nss_ctx, alt_result);
-
-  /* Start computation of P byte sequence.  */
-  sha512_init_ctx (&alt_ctx, nss_alt_ctx);
-
-  /* For every character in the password add the entire password.  */
-  for (cnt = 0; cnt < key_len; ++cnt)
-    sha512_process_bytes (key, key_len, &alt_ctx, nss_alt_ctx);
-
-  /* Finish the digest.  */
-  sha512_finish_ctx (&alt_ctx, nss_alt_ctx, temp_result);
-
-  /* Create byte sequence P.  */
-  if (__libc_use_alloca (alloca_used + key_len))
-    cp = p_bytes = (char *) alloca (key_len);
-  else
-    {
-      free_pbytes = cp = p_bytes = (char *)malloc (key_len);
-      if (free_pbytes == NULL)
-	{
-	  free (free_key);
-	  return NULL;
-	}
-    }
-
-  for (cnt = key_len; cnt >= 64; cnt -= 64)
-    cp = mempcpy (cp, temp_result, 64);
-  memcpy (cp, temp_result, cnt);
-
-  /* Start computation of S byte sequence.  */
-  sha512_init_ctx (&alt_ctx, nss_alt_ctx);
-
-  /* For every character in the password add the entire password.  */
-  for (cnt = 0; cnt < 16 + alt_result[0]; ++cnt)
-    sha512_process_bytes (salt, salt_len, &alt_ctx, nss_alt_ctx);
-
-  /* Finish the digest.  */
-  sha512_finish_ctx (&alt_ctx, nss_alt_ctx, temp_result);
-
-  /* Create byte sequence S.  */
-  cp = s_bytes = alloca (salt_len);
-  for (cnt = salt_len; cnt >= 64; cnt -= 64)
-    cp = mempcpy (cp, temp_result, 64);
-  memcpy (cp, temp_result, cnt);
-
-  /* Repeatedly run the collected hash value through SHA512 to burn
-     CPU cycles.  */
-  for (cnt = 0; cnt < rounds; ++cnt)
-    {
-      /* New context.  */
-      sha512_init_ctx (&ctx, nss_ctx);
-
-      /* Add key or last result.  */
-      if ((cnt & 1) != 0)
-	sha512_process_bytes (p_bytes, key_len, &ctx, nss_ctx);
-      else
-	sha512_process_bytes (alt_result, 64, &ctx, nss_ctx);
-
-      /* Add salt for numbers not divisible by 3.  */
-      if (cnt % 3 != 0)
-	sha512_process_bytes (s_bytes, salt_len, &ctx, nss_ctx);
-
-      /* Add key for numbers not divisible by 7.  */
-      if (cnt % 7 != 0)
-	sha512_process_bytes (p_bytes, key_len, &ctx, nss_ctx);
-
-      /* Add key or last result.  */
-      if ((cnt & 1) != 0)
-	sha512_process_bytes (alt_result, 64, &ctx, nss_ctx);
-      else
-	sha512_process_bytes (p_bytes, key_len, &ctx, nss_ctx);
-
-      /* Create intermediate result.  */
-      sha512_finish_ctx (&ctx, nss_ctx, alt_result);
-    }
-
-#ifdef USE_NSS
-  /* Free libfreebl3 resources. */
-  NSSLOW_Shutdown (nss_ictx);
-#endif
-
-  /* Now we can construct the result string.  It consists of three
-     parts.  */
-  cp = __stpncpy (buffer, sha512_salt_prefix, MAX (0, buflen));
-  buflen -= sizeof (sha512_salt_prefix) - 1;
-
-  if (rounds_custom)
-    {
-      int n = __snprintf (cp, MAX (0, buflen), "%s%zu$",
-			  sha512_rounds_prefix, rounds);
-      cp += n;
-      buflen -= n;
-    }
-
-  cp = __stpncpy (cp, salt, MIN ((size_t) MAX (0, buflen), salt_len));
-  buflen -= MIN ((size_t) MAX (0, buflen), salt_len);
-
-  if (buflen > 0)
-    {
-      *cp++ = '$';
-      --buflen;
-    }
-
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[0], alt_result[21], alt_result[42], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[22], alt_result[43], alt_result[1], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[44], alt_result[2], alt_result[23], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[3], alt_result[24], alt_result[45], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[25], alt_result[46], alt_result[4], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[47], alt_result[5], alt_result[26], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[6], alt_result[27], alt_result[48], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[28], alt_result[49], alt_result[7], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[50], alt_result[8], alt_result[29], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[9], alt_result[30], alt_result[51], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[31], alt_result[52], alt_result[10], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[53], alt_result[11], alt_result[32], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[12], alt_result[33], alt_result[54], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[34], alt_result[55], alt_result[13], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[56], alt_result[14], alt_result[35], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[15], alt_result[36], alt_result[57], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[37], alt_result[58], alt_result[16], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[59], alt_result[17], alt_result[38], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[18], alt_result[39], alt_result[60], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[40], alt_result[61], alt_result[19], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    alt_result[62], alt_result[20], alt_result[41], 4);
-  __b64_from_24bit (&cp, &buflen,
-		    0, 0, alt_result[63], 2);
-
-  if (buflen <= 0)
-    {
-      __set_errno (ERANGE);
-      buffer = NULL;
-    }
-  else
-    *cp = '\0';		/* Terminate the string.  */
-
-  /* Clear the buffer for the intermediate result so that people
-     attaching to processes or reading core dumps cannot get any
-     information.  We do it in this way to clear correct_words[]
-     inside the SHA512 implementation as well.  */
-#ifndef USE_NSS
-  __sha512_init_ctx (&ctx);
-  __sha512_finish_ctx (&ctx, alt_result);
-  explicit_bzero (&ctx, sizeof (ctx));
-  explicit_bzero (&alt_ctx, sizeof (alt_ctx));
-#endif
-  explicit_bzero (temp_result, sizeof (temp_result));
-  explicit_bzero (p_bytes, key_len);
-  explicit_bzero (s_bytes, salt_len);
-  if (copied_key != NULL)
-    explicit_bzero (copied_key, key_len);
-  if (copied_salt != NULL)
-    explicit_bzero (copied_salt, salt_len);
-
-  free (free_key);
-  free (free_pbytes);
-  return buffer;
-}
-
-static char *buffer;
-
-/* This entry point is equivalent to the `crypt' function in Unix
-   libcs.  */
-char *
-__sha512_crypt (const char *key, const char *salt)
-{
-  /* We don't want to have an arbitrary limit in the size of the
-     password.  We can compute an upper bound for the size of the
-     result in advance and so we can prepare the buffer we pass to
-     `sha512_crypt_r'.  */
-  static int buflen;
-  int needed = (sizeof (sha512_salt_prefix) - 1
-		+ sizeof (sha512_rounds_prefix) + 9 + 1
-		+ strlen (salt) + 1 + 86 + 1);
-
-  if (buflen < needed)
-    {
-      char *new_buffer = (char *) realloc (buffer, needed);
-      if (new_buffer == NULL)
-	return NULL;
-
-      buffer = new_buffer;
-      buflen = needed;
-    }
-
-  return __sha512_crypt_r (key, salt, buffer, buflen);
-}
-
-static void
-__attribute__ ((__destructor__))
-free_mem (void)
-{
-  free (buffer);
-}