update from main archive 961214cvs/libc-961215

Sun Dec 15 01:53:20 1996  Ulrich Drepper  <drepper@cygnus.com>

	* Makefile (subdirs): Change crypt to md5-crypt.
	* crypt/Makefile, crypt/md5-crypt.c, crypt/md5.c, crypt/md5.h,
	crypt/md5c-test.c, crypt/md5test.c: Move to new directory
	md5-crypt.
	* sysdeps/unix/sysv/linux/configure.in: Refer to linuxthreads and
	crypt instead of LinuxThreads and des-crypt.

	* Makefile (subdirs): Add nss back.
	* sysdeps/unix/inet/Subdirs: Move nis to end of file to fulfill
	dependencies.

	* libio/iofclose.c: Implement fclose(NULL) as closing all streams.
	* stdio-common/Makefile (routines): Add fcloseall.
	* stdio-common/fcloseall.c: New file.
	* sysdeps/generic/abort.c: Make implementation POSIX.1 compatible.

	* sysdeps/mach/libc-lock.h: Add definition of __libc_lock_trylock.
	* sysdeps/stub/libc-lock.h: Define __libc_lock_trylock to always
	return 0.

	* stdio-common/printf.h: Define MIN and MAX only if not already
	defined.

	* stdio-common/vfprintf.c: Set errno to EBADF if stream does not
	allow writing.  Required by POSIX.1.

	* libio/libioP.h (CHECK_FILE): Use MAYBE_SET_EINVAL instead of
	assignment.

	* interp.c: Update copyright.
	* libio/clearerr.c: Likewise.
	* libio/ioseekoff.c: Likewise.
	* libio/ioseekpos.c: Likewise.
	* stdio/fclose.c: Likewise.
	* stdio/fflus.c: Likewise.

	* libio/libio.h [!_IO_MTSAFE_IO]: Define _IO_cleanup_region_start
	and _IO_cleanup_region_end as empty.
	* libio/fgetc.c: Use _IO_cleanup_region_start and
	_IO_cleanup_region_end instead of __libc_cleanup_region_start and
	__libc_cleanup_region_end.
	* libio/fputc.c: Likewise.
	* libio/freopen.c: Likewise.
	* libio/fseek.c: Likewise.
	* libio/getc.c: Likewise.
	* libio/getchar.c: Likewise.
	* libio/iofclose.c: Likewise.
	* libio/iofflush.c: Likewise.
	* libio/iofgetpos.c: Likewise.
	* libio/iofgets.c: Likewise.
	* libio/iofputs.c: Likewise.
	* libio/iofread.c: Likewise.
	* libio/iofsetpos.c: Likewise.
	* libio/ioftell.c: Likewise.
	* libio/iofwrite.c: Likewise.
	* libio/iogetdelim.c: Likewise.
	* libio/iogets.c: Likewise.
	* libio/ioputs.c: Likewise.
	* libio/iosetbuffer.c: Likewise.
	* libio/iosetvbuf.c: Likewise.
	* libio/ioungetc.c: Likewise.

	* libio/iovspintf.c: Use cleanup handler to make sure no dangling
	locks can stay over.
	* libio/iovsscanf.c: Likewise.

	* libio/genops.c: Use _IO_lock_init_recursive and _IO_lock_fini
	instead of __libc_lock_init_recursive and __libc_lock_fini.

	* libio/filedoalloc.c: Only use __isatty when compiling GNU libc.
	Otherwise use isatty.
	* libio/fileops.c: Likewise for __open and open.

	* login/utmp_file.c (getutent_r_file): Use fcntl instead of
	flock.

	* nis/ypclnt.h: Add more casts to prevent warnings.

	* nss/Makefile (services): Remove dns.
	(libnss_dns, libnss_dns-inhibit-o): Remove definition.
	($(objpfx)libnss_dns.so): Removed.
	* nss/nss_dns/dns-host.c, nss/nss_dns/dns-network.c: Moved to...
	* resolv/nss_dns: ...here.
	* resolv/Makefile (extra-libs): Add libnss_dns.
	(libnss_dns-routines, libnss_dns-inhibit-o): Define as in
	nss/Makefile.

	* nss/XXX-lookup.c: Call __nss_database_lookup with new argument
	specifying alternate name for entry in /etc/nsswitch.conf
	* nss/nsswitch.c: If no entry with primary name is found in
	/etc/nsswitch.conf try alternate name if given.
	* nss/nsswitch.h: Add new parameter in prototype for
	__nss_database_lookup.
	* nss/spwd-lookup.c: Provide alternative entry name to look for.
	This makes our NSS compatible with Solaris' nsswitch.conf files.

	* string/tst-strlen.c: Change all counting variables to type size_t
	to prevent warnings.

	* sysdeps/posix/fpathconf.c: Update copyright.
	* sysdeps/posix/pathconf.c: Don't call fpathconf to do the work.
	Opening the file at this path may fail if it is a FIFO or pipe.

	These changes make the time implementation POSIX.1 compliant.
	* time/localtime.c (__localtime_r): Always call __tzset not only
	if __tzset_run is zero.
	* time/strftime.c: Add definition of memset_space to help to
	reduce for systems which have memset.
	(strftime): Don't use tm_zone member of argument for zone name.
	Instead always use tzname[].
	Call tzset() as required by POSIX.1 before any action.
	* time/tzset.c (tzset): Set tzname[] as required by POSIX.1.
	Remove global variable __tzset_run.  __tzset is now called always
	when a dependent function is used.
	(__tzset): Caching happens based on the contents of the
	environment variable TZ.

Fri Dec 13 01:06:52 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/paths.h: Add _PATH_KLOG.

Thu Dec 12 09:16:35 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* rellns-sh: Correctly handle a relative source file name.

Wed Dec 11 19:18:40 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* login/utmp_file.c (setutent_file): Seek back to beginning of the
	file if resetting.

Thu Dec 12 16:39:12 1996  Thomas Bushnell, n/BSG  <thomas@gnu.ai.mit.edu>

	* hurd/hurdinit.c (map0): Delete function.  Don't do this on
	_hurd_preinit_hook.
	* hurd/hurdstartup.c (_hurd_startup): Map page zero redzone here.

1 files changed, 226 insertions, 0 deletions

diff --git a/md5-crypt/md5-crypt.c b/md5-crypt/md5-crypt.c
new file mode 100644
index 0000000..308366c
--- /dev/null
+++ b/md5-crypt/md5-crypt.c
@@ -0,0 +1,226 @@
+/* md5-crypt - One way encryption based on MD5 sum.
+Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/param.h>
+
+#include "md5.h"
+
+
+/* Define our magic string to mark salt for MD5 "encryption"
+   replacement.  This is meant to be the same as for other MD5 based
+   encryption implementations.  */
+static const char md5_salt_prefix[] = "$1$";
+
+/* Table with characters for base64 transformation.  */
+static const char b64t[64] =
+"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+
+/* Prototypes for local functions.  */
+extern char *md5_crypt_r __P ((const char *key, const char *salt, char *buffer,
+			       int buflen));
+extern char *md5_crypt __P ((const char *key, const char *salt));
+
+
+
+/* This entry point is equivalent to the `crypt' function in Unix
+   libcs.  */
+char *
+md5_crypt_r (key, salt, buffer, buflen)
+     const char *key;
+     const char *salt;
+     char *buffer;
+     int buflen;
+{
+  unsigned char alt_result[16];
+  struct md5_ctx ctx;
+  struct md5_ctx alt_ctx;
+  size_t salt_len;
+  size_t key_len;
+  size_t cnt;
+  char *cp;
+
+  /* Find beginning of salt string.  The prefix should normally always
+     be present.  Just in case it is not.  */
+  if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0)
+    /* Skip salt prefix.  */
+    salt += sizeof (md5_salt_prefix) - 1;
+
+  salt_len = MIN (strcspn (salt, "$"), 8);
+  key_len = strlen (key);
+
+  /* Prepare for the real work.  */
+  md5_init_ctx (&ctx);
+
+  /* Add the key string.  */
+  md5_process_bytes (key, key_len, &ctx);
+
+  /* Because the SALT argument need not always have the salt prefix we
+     add it separately.  */
+  md5_process_bytes (md5_salt_prefix, sizeof (md5_salt_prefix) - 1, &ctx);
+
+  /* The last part is the salt string.  This must be at most 8
+     characters and it ends at the first `$' character (for
+     compatibility which existing solutions).  */
+  md5_process_bytes (salt, salt_len, &ctx);
+
+
+  /* Compute alternate MD5 sum with input KEY, SALT, and KEY.  The
+     final result will be added to the first context.  */
+  md5_init_ctx (&alt_ctx);
+
+  /* Add key.  */
+  md5_process_bytes (key, key_len, &alt_ctx);
+
+  /* Add salt.  */
+  md5_process_bytes (salt, salt_len, &alt_ctx);
+
+  /* Add key again.  */
+  md5_process_bytes (key, key_len, &alt_ctx);
+
+  /* Now get result of this (16 bytes) and add it to the other
+     context.  */
+  md5_finish_ctx (&alt_ctx, alt_result);
+
+  /* Add for any character in the key one byte of the alternate sum.  */
+  for (cnt = key_len; cnt > 16; cnt -= 16)
+    md5_process_bytes (alt_result, 16, &ctx);
+  md5_process_bytes (alt_result, cnt, &ctx);
+
+  /* For the following code we need a NUL byte.  */
+  *alt_result = '\0';
+
+  /* The original implementation now does something weird: for every 1
+     bit in the key the first 0 is added to the buffer, for every 0
+     bit the first character of the key.  This does not seem to be
+     what was intended but we have to follow this to be compatible.  */
+  for (cnt = key_len; cnt > 0; cnt >>= 1)
+    md5_process_bytes ((cnt & 1) != 0 ? (const char *) alt_result : key, 1,
+		       &ctx);
+
+  /* Create intermediate result.  */
+  md5_finish_ctx (&ctx, alt_result);
+
+  /* Now comes another weirdness.  In fear of password crackers here
+     comes a quite long loop which just processes the output of the
+     previous round again.  We cannot ignore this here.  */
+  for (cnt = 0; cnt < 1000; ++cnt)
+    {
+      /* New context.  */
+      md5_init_ctx (&ctx);
+
+      /* Add key or last result.  */
+      if ((cnt & 1) != 0)
+	md5_process_bytes (key, key_len, &ctx);
+      else
+	md5_process_bytes (alt_result, 16, &ctx);
+
+      /* Add salt for numbers not divisible by 3.  */
+      if (cnt % 3 != 0)
+	md5_process_bytes (salt, salt_len, &ctx);
+
+      /* Add key for numbers not divisible by 7.  */
+      if (cnt % 7 != 0)
+	md5_process_bytes (key, key_len, &ctx);
+
+      /* Add key or last result.  */
+      if ((cnt & 1) != 0)
+	md5_process_bytes (alt_result, 16, &ctx);
+      else
+	md5_process_bytes (key, key_len, &ctx);
+
+      /* Create intermediate result.  */
+      md5_finish_ctx (&ctx, alt_result);
+    }
+
+  /* Now we can construct the result string.  It consists of three
+     parts.  */
+  cp = stpncpy (buffer, md5_salt_prefix, MAX (0, buflen));
+  buflen -= sizeof (md5_salt_prefix);
+
+  cp = stpncpy (cp, salt, MIN ((size_t) buflen, salt_len));
+  buflen -= MIN ((size_t) buflen, salt_len);
+
+  if (buflen > 0)
+    {
+      *cp++ = '$';
+      --buflen;
+    }
+
+#define b64_from_24bit(B2, B1, B0, N)					      \
+  do {									      \
+    unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);			      \
+    int n = (N);							      \
+    while (n-- > 0 && buflen > 0)					      \
+      {									      \
+	*cp++ = b64t[w & 0x3f];						      \
+	--buflen;							      \
+	w >>= 6;							      \
+      }									      \
+  } while (0)
+
+
+  b64_from_24bit (alt_result[0], alt_result[6], alt_result[12], 4);
+  b64_from_24bit (alt_result[1], alt_result[7], alt_result[13], 4);
+  b64_from_24bit (alt_result[2], alt_result[8], alt_result[14], 4);
+  b64_from_24bit (alt_result[3], alt_result[9], alt_result[15], 4);
+  b64_from_24bit (alt_result[4], alt_result[10], alt_result[5], 4);
+  b64_from_24bit (0, 0, alt_result[11], 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.  */
+  memset (alt_result, '\0', sizeof (alt_result));
+
+  return buffer;
+}
+
+
+char *
+md5_crypt (key, salt)
+     const char *key;
+     const char *salt;
+{
+  /* We don't want to have an arbitrary limit in the size of the
+     password.  We can compute the size of the result in advance and
+     so we can prepare the buffer we pass to `md5_crypt_r'.  */
+  static char *buffer = NULL;
+  static int buflen = 0;
+  int needed = 3 + strlen (salt) + 1 + 26 + 1;
+
+  if (buflen < needed)
+    {
+      buflen = needed;
+      if ((buffer = realloc (buffer, buflen)) == NULL)
+	return NULL;
+    }
+
+  return md5_crypt_r (key, salt, buffer, buflen);
+}