Initial Commit

6 files changed, 1178 insertions, 0 deletions

diff --git a/ntlm/Makefile.am b/ntlm/Makefile.am
new file mode 100644
index 0000000..a636e50
--- /dev/null
+++ b/ntlm/Makefile.am
@@ -0,0 +1,11 @@
+## Process this file with automake to produce Makefile.in
+
+libdir = @plugindir@
+
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+
+lib_LTLIBRARIES = sasl-ntlm.la
+
+sasl_ntlm_la_SOURCES = client-ntlm.c ntlmdes.c ntlmstruct.c ntlm.h
+sasl_ntlm_la_LDFLAGS = -module -avoid-version @NTLM_LIBS@
diff --git a/ntlm/Makefile.in b/ntlm/Makefile.in
new file mode 100644
index 0000000..c7f5e6a
--- /dev/null
+++ b/ntlm/Makefile.in
@@ -0,0 +1,478 @@
+# Makefile.in generated by automake 1.9.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005  Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+SOURCES = $(sasl_ntlm_la_SOURCES)
+
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+POST_INSTALL = :
+NORMAL_UNINSTALL = :
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+POST_UNINSTALL = :
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+clean-libLTLIBRARIES:
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+	@list='$(lib_LTLIBRARIES)'; for p in $$list; do \
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+	  test "$$dir" != "$$p" || dir=.; \
+	  echo "rm -f \"$${dir}/so_locations\""; \
+	  rm -f "$${dir}/so_locations"; \
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+	$(LINK) -rpath $(libdir) $(sasl_ntlm_la_LDFLAGS) $(sasl_ntlm_la_OBJECTS) $(sasl_ntlm_la_LIBADD) $(LIBS)
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+		$(TAGS_FILES) $(LISP)
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+	here=`pwd`; \
+	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
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+	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+	  done | \
+	  $(AWK) '    { files[$$0] = 1; } \
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+	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	  `test -z '$(STRIP)' || \
+	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
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+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
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+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
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+	install install-am install-data install-data-am install-exec \
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/ntlm/client-ntlm.c b/ntlm/client-ntlm.c
new file mode 100644
index 0000000..3067f85
--- /dev/null
+++ b/ntlm/client-ntlm.c
@@ -0,0 +1,149 @@
+/*
+ *  Authentication module for the Micr$oft NTLM mechanism.
+ *
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This 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.
+ *
+ *  This 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 this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#define _XOPEN_SOURCE	500
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include "ntlm.h"
+#include "auth-client.h"
+#include "auth-plugin.h"
+
+#if 0
+/* This is handy for changing te value of the flags in the debugger. */
+unsigned int t1flags = TYPE1_FLAGS;
+#undef TYPE1_FLAGS
+#define TYPE1_FLAGS t1flags
+#endif
+
+#define NELT(x)		(sizeof x / sizeof x[0])
+
+static int ntlm_init (void *pctx);
+static void ntlm_destroy (void *ctx);
+static const char *ntlm_response (void *ctx,
+				  const char *challenge, int *len,
+				  auth_interact_t interact, void *arg);
+
+const struct auth_client_plugin sasl_client =
+  {
+  /* Plugin information */
+    "NTLM",
+    "NTLM Authentication Mechanism (Microsoft)",
+  /* Plugin instance */
+    ntlm_init,
+    ntlm_destroy,
+  /* Authentication */
+    ntlm_response,
+    0,
+  /* Security Layer */
+    0,
+    NULL,
+    NULL,
+  };
+
+static const struct auth_client_request client_request[] =
+  {
+    { "domain",		AUTH_CLEARTEXT | AUTH_REALM,	"Domain",	0, },
+    { "user",		AUTH_CLEARTEXT | AUTH_USER,	"User Name",	0, },
+    { "passphrase",	AUTH_PASS,			"Pass Phrase",	0, },
+  };
+
+struct ntlm_context
+  {
+    int state;
+    char *result[NELT (client_request)];
+    char host[64];
+    char buf[256];
+  };
+ 
+static int 
+ntlm_init (void *pctx)
+{
+  struct ntlm_context *context;
+
+  context = malloc (sizeof (struct ntlm_context));
+  memset (context, 0, sizeof (struct ntlm_context));
+
+  *(void **) pctx = context;
+  return 1;
+}
+
+static void
+ntlm_destroy (void *ctx)
+{
+  struct ntlm_context *context = ctx;
+
+  memset (context, 0, sizeof (struct ntlm_context));
+  free (context);
+}
+
+static const char *
+ntlm_response (void *ctx, const char *challenge, int *len,
+	       auth_interact_t interact, void *arg)
+{
+  struct ntlm_context *context = ctx;
+  unsigned char nonce[8];
+  unsigned char lm_resp[24], nt_resp[24];
+  unsigned int flags;
+  char *domain = NULL;
+  char *p;
+
+  switch (context->state)
+    {
+    case 0:	/* build the authentication request */
+      context->state = 1;
+      if (!(*interact) (client_request, context->result, NELT (client_request),
+                        arg))
+        break;
+      gethostname (context->host, sizeof context->host);
+      if ((p = strchr (context->host, '.')) != NULL)
+        *p = '\0';
+      *len = ntlm_build_type_1 (context->buf, sizeof context->buf, TYPE1_FLAGS,
+      				context->result[0], context->host);
+      return context->buf;
+
+    case 1:	/* compute a response based om the challenge */
+      context->state = 2;
+      if (!ntlm_parse_type_2 (challenge, *len, &flags, nonce, &domain))
+        break;
+      ntlm_responses (lm_resp, nt_resp, nonce, context->result[2]);
+      *len = ntlm_build_type_3 (context->buf, sizeof context->buf,
+				flags, lm_resp, nt_resp,
+				context->result[0], context->result[1],
+				context->host);
+      if (domain != NULL)
+        free (domain);
+      return context->buf;
+    }
+  *len = 0;
+  return NULL;
+}
+
diff --git a/ntlm/ntlm.h b/ntlm/ntlm.h
new file mode 100644
index 0000000..50a49d6
--- /dev/null
+++ b/ntlm/ntlm.h
@@ -0,0 +1,52 @@
+#ifndef _ntlm_h
+#define _ntlm_h
+/*
+ *  Authentication module for the Micr$oft NTLM mechanism.
+ *
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This 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.
+ *
+ *  This 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 this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+char *lm_uccpy (char *dst, size_t dstlen, const char *src);
+unsigned char *nt_unicode (const char *string, size_t len);
+
+void lm_hash_password (unsigned char *hash, const char *pass);
+void nt_hash_password (unsigned char *hash, const char *pass);
+
+void ntlm_responses (unsigned char *lm_resp, unsigned char *nt_resp,
+		     const unsigned char *challenge, const char *secret);
+
+size_t ntlm_build_type_1 (char *buf, size_t buflen, unsigned int flags,
+			  const char *domain, const char *workstation);
+size_t ntlm_build_type_2 (char *buf, size_t buflen, unsigned int flags,
+			  const unsigned char *nonce, const char *domain);
+size_t ntlm_build_type_3 (char *buf, size_t buflen,
+			  unsigned int flags,
+			  const unsigned char *lm_resp,
+			  const unsigned char *nt_resp,
+			  const char *domain, const char *user,
+			  const char *workstation);
+
+size_t ntlm_parse_type_2 (const char *buf, size_t buflen, unsigned int *flags,
+		          unsigned char *nonce, char **domain);
+
+#define TYPE1_FLAGS	0x8202u
+
+#endif
diff --git a/ntlm/ntlmdes.c b/ntlm/ntlmdes.c
new file mode 100644
index 0000000..57a39d1
--- /dev/null
+++ b/ntlm/ntlmdes.c
@@ -0,0 +1,157 @@
+/*
+ *  Authentication module for the Micr$oft NTLM mechanism.
+ *
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This 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.
+ *
+ *  This 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 this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <openssl/des.h>
+#include <openssl/md4.h>
+
+#include "ntlm.h"
+
+static void
+lm_deshash (void *result, const_des_cblock *iv, const void *secret)
+{
+  des_cblock key;
+  des_key_schedule ks;
+  unsigned char key_56[8];
+  size_t len;
+
+  /* copy and pad the secret */
+  len = strlen (secret);
+  if (len > sizeof key_56)
+    len = sizeof key_56;
+  memcpy (key_56, secret, len);
+  if (sizeof key_56 - len > 0)
+    memset (key_56 + len, 0, sizeof key_56 - len);
+
+  /* convert 56 bit key to the 64 bit */
+  key[0] = key_56[0];
+  key[1] = (key_56[0] << 7) | (key_56[1] >> 1);
+  key[2] = (key_56[1] << 6) | (key_56[2] >> 2);
+  key[3] = (key_56[2] << 5) | (key_56[3] >> 3);
+  key[4] = (key_56[3] << 4) | (key_56[4] >> 4);
+  key[5] = (key_56[4] << 3) | (key_56[5] >> 5);
+  key[6] = (key_56[5] << 2) | (key_56[6] >> 6);
+  key[7] = (key_56[6] << 1);
+
+  des_set_odd_parity (&key);
+  des_set_key (&key, ks);
+  des_ecb_encrypt (iv, result, ks, DES_ENCRYPT);
+
+  /* paranoia */
+  memset (key, 0, sizeof key);
+  memset (&ks, 0, sizeof ks);
+}
+
+/* Copy and convert to upper case.  If supplied string is shorter than the
+   destination, zero pad the remainder. */
+char *
+lm_uccpy (char *dst, size_t dstlen, const char *src)
+{
+  char *p;
+  size_t len;
+
+  if ((len = strlen (src)) > dstlen)
+    len = dstlen;
+  for (p = dst; len > 0; p++, src++, len--)
+    *p = toupper (*src);
+  if (p < dst + dstlen)
+    memset (p, 0, dst + dstlen - p);
+  return dst;
+}
+
+/* create LanManager hashed password */
+void
+lm_hash_password (unsigned char *hash, const char *pass)
+{
+  static const_des_cblock iv = { 0x4B, 0x47, 0x53, 0x21,
+                                 0x40, 0x23, 0x24, 0x25 };
+  char lmpass[14];
+
+  lm_uccpy (lmpass, sizeof lmpass, pass);
+  lm_deshash (hash, &iv, lmpass);
+  lm_deshash (hash + 8, &iv, lmpass + 7);
+  memset (lmpass, 0, sizeof lmpass);
+}
+
+/* convert to unicode */
+unsigned char *
+nt_unicode (const char *string, size_t len)
+{
+  unsigned char *uni, *pp;
+
+  uni = malloc (len * 2);
+  if ((pp = uni) != NULL)
+    while (len-- > 0)
+      {
+	*pp++ = (unsigned char) *string++;
+	*pp++ = 0;
+      }
+  return uni;
+}
+
+void
+nt_hash_password (unsigned char *hash, const char *pass)
+{
+  int len;
+  unsigned char *nt_pw;
+  MD4_CTX context;
+
+  len = strlen (pass);
+  if ((nt_pw = nt_unicode (pass, len)) == NULL)
+    return;
+
+  MD4_Init (&context);
+  MD4_Update (&context, nt_pw, 2 * len);
+  MD4_Final (hash, &context);
+  memset (&context, 0, sizeof context);
+  memset (nt_pw, 0, 2 * len);
+  free (nt_pw);
+}
+
+/* Use the server's 8 octet nonce and the secret to create the 24 octet
+   LanManager and NT responses. */
+void
+ntlm_responses (unsigned char *lm_resp, unsigned char *nt_resp,
+		const unsigned char *challenge, const char *secret)
+{
+  unsigned char hash[21];
+  des_cblock nonce;
+
+  memcpy (&nonce, challenge, sizeof nonce);
+
+  lm_hash_password (hash, secret);
+  memset (hash + 16, 0, 5);
+  lm_deshash (lm_resp, &nonce, hash);
+  lm_deshash (lm_resp + 8, &nonce, hash + 7);
+  lm_deshash (lm_resp + 16, &nonce, hash + 14);
+
+  nt_hash_password (hash, secret);
+  memset (hash + 16, 0, 5);
+  lm_deshash (nt_resp, &nonce, hash);
+  lm_deshash (nt_resp + 8, &nonce, hash + 7);
+  lm_deshash (nt_resp + 16, &nonce, hash + 14);
+  memset (hash, 0, sizeof hash);
+}
+
diff --git a/ntlm/ntlmstruct.c b/ntlm/ntlmstruct.c
new file mode 100644
index 0000000..dfb80de
--- /dev/null
+++ b/ntlm/ntlmstruct.c
@@ -0,0 +1,331 @@
+/*
+ *  Authentication module for the Micr$oft NTLM mechanism.
+ *
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This 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.
+ *
+ *  This 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 this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "ntlm.h"
+
+/* Must have at least 32 bits in an int (at least pending a more thorough
+   code review - this module is still experimental) */
+#if SIZEOF_UNSIGNED_INT < 32 / 8
+# error "unsigned int is less than 32 bits wide"
+#endif
+
+#if SIZEOF_UNSIGNED_SHORT == 16 / 8
+typedef unsigned short unsigned16_t;
+#else
+#include <sys/types.h>
+typedef	uint16 unsigned16_t;
+#endif
+
+#if SIZEOF_UNSIGNED_INT == 32 / 8
+typedef	unsigned int unsigned32_t;
+#elif SIZEOF_UNSIGNED_LONG == 32 / 8
+typedef	unsigned long unsigned32_t;
+#else
+#include <sys/types.h>
+typedef	uint32 unsigned32_t;
+#endif
+
+#ifdef WORDS_BIGENDIAN
+/* Everything in NTLM is little endian binary, therefore byte swapping
+   is needed on big endian platforms.  For simplicity, always provide
+   byte swapping functions rather than trying to detect the local
+   platform's support.  These functions make no effort to be efficient
+   since this code doesn't require efficient byte swapping. */
+
+#define SWAP(a,b)	do { unsigned char s = u.swap[(a)];	\
+			     u.swap[(a)] = u.swap[(b)];		\
+			     u.swap[(b)] = s; } while (0)
+
+static unsigned16_t
+bswap_16 (unsigned16_t value)
+{
+  union { unsigned16_t val; unsigned char swap[2]; } u;
+
+  u.val = value;
+  SWAP(0,1);
+  return u.val;
+}
+
+static unsigned32_t
+bswap_32 (unsigned32_t value)
+{
+  union u32 { unsigned32_t val; unsigned char swap[4]; } u;
+
+  u.val = value;
+  SWAP(0,3);
+  SWAP(1,2);
+  return u.val;
+}
+
+#undef SWAP
+#endif
+
+static void
+write_uint16 (char *buf, size_t offset, unsigned int value)
+{
+  unsigned16_t i16 = value;
+
+  assert (sizeof i16 == 2);
+#ifdef WORDS_BIGENDIAN
+  i16 = bswap_16 (i16);
+#endif
+  memcpy (buf + offset, &i16, sizeof i16);
+}
+
+static inline void
+write_uint32 (char *buf, size_t offset, unsigned int value)
+{
+  unsigned32_t i32 = value;
+
+  assert (sizeof i32 == 4);
+#ifdef WORDS_BIGENDIAN
+  i32 = bswap_32 (i32);
+#endif
+  memcpy (buf + offset, &i32, sizeof i32);
+}
+
+static inline unsigned int
+read_uint16 (const char *buf, size_t offset)
+{
+  unsigned16_t i16;
+
+  assert (sizeof i16 == 2);
+  memcpy (&i16, buf + offset, sizeof i16);
+#ifdef WORDS_BIGENDIAN
+  i16 = bswap_16 (i16);
+#endif
+  return i16;
+}
+
+static inline unsigned int
+read_uint32 (const char *buf, size_t offset)
+{
+  unsigned32_t i32;
+
+  assert (sizeof i32 == 4);
+  memcpy (&i32, buf + offset, sizeof i32);
+#ifdef WORDS_BIGENDIAN
+  i32 = bswap_32 (i32);
+#endif
+  return i32;
+}
+
+static inline void
+write_string (char *buf, size_t offset, size_t *str_offset,
+              const void *data, size_t len)
+{
+  if (data == NULL)
+    len = 0;
+  write_uint16 (buf, offset, len);
+  write_uint16 (buf, offset + 2, len);
+  write_uint32 (buf, offset + 4, *str_offset);
+  if (len > 0)
+    memcpy (buf + *str_offset, data, len);
+  *str_offset += len;
+}
+
+/* Offsets into on-the-wire NTLM structures */
+#define PROTOCOL			0	/* "NTLMSSP" */
+#define MSGTYPE				8	/* 1..3 */
+/* Type 1 fields */
+#define T1FLAGS				12	/* 0xb203 */
+#define T1DOMAIN			16	/* domain to authenticate in */
+#define T1WKSTN				24	/* client workstation name */
+#define T1SIZE				32
+/* Type 2 fields */
+#define T2AUTHTARGET			12	/* domain/server */
+#define T2FLAGS				20	/* 0x8201 */
+#define T2NONCE				24	/* server challenge */
+#define T2RESERVED			32
+#define T2SIZE				40
+/* Type 3 fields */
+#define T3LMRESPONSE			12	/* lanmanager hash */
+#define T3NTRESPONSE			20	/* nt hash */
+#define T3DOMAIN			28	/* domain to authenticate against */
+#define T3USER				36	/* user name */
+#define T3WKSTN				44	/* client workstation name */
+#define T3SESSIONKEY			52	/* client workstation name */
+#define T3FLAGS				60	/* 0xb203 */
+#define T3SIZE				64
+
+static const char NTLMSSP[] = "NTLMSSP";
+
+/* Build a NTLM type 1 structure in the buffer.
+        domain - the NT domain the workstation belongs to
+   workstation - the NT (netbios) name of the workstation */
+size_t
+ntlm_build_type_1 (char *buf, size_t buflen, unsigned int flags,
+                   const char *domain, const char *workstation)
+{
+  size_t offset = T1SIZE;
+  size_t len;
+  unsigned char *up;
+  char string[256];
+
+  if (buflen < offset)
+    return 0;
+  memcpy (buf, NTLMSSP, 8);
+  write_uint32 (buf, MSGTYPE, 1);
+  write_uint32 (buf, T1FLAGS, flags);
+  up = NULL;
+  len = 0;
+  if (domain != NULL)
+    {
+      len = strlen (domain);
+      if (offset + len > buflen)
+	return 0;
+      lm_uccpy (string, len, domain);
+    }
+  write_string (buf, T1DOMAIN, &offset, string, len);
+  up = NULL;
+  len = 0;
+  if (workstation != NULL)
+    {
+      len = strlen (workstation);
+      if (offset + len > buflen)
+	return 0;
+      lm_uccpy (string, len, workstation);
+    }
+  write_string (buf, T1WKSTN, &offset, string, len);
+  return offset;
+}
+
+/* Build a NTLM type 2 structure in the buffer */
+size_t
+ntlm_build_type_2 (char *buf, size_t buflen, unsigned int flags,
+                   const unsigned char *nonce, const char *domain)
+{
+  size_t offset = T2SIZE;
+  size_t len;
+  char string[256];
+  unsigned char *up;
+
+  if (buflen < offset)
+    return 0;
+  memcpy (buf, NTLMSSP, 8);
+  write_uint32 (buf, MSGTYPE, 2);
+  up = NULL;
+  len = 0;
+  if (domain != NULL)
+    {
+      len = strlen (domain);
+      if (offset + 2 * len > buflen)
+	return 0;
+      up = nt_unicode (lm_uccpy (string, len, domain), 2 * len);
+    }
+  write_string (buf, T2AUTHTARGET, &offset, up, len);
+  if (up != NULL)
+    free (up);
+  write_uint32 (buf, T2FLAGS, flags);
+  memcpy (buf + T2NONCE, nonce, 8);
+  memset (buf + T2RESERVED, 0, 8);
+  return offset;
+}
+
+/* Build a NTLM type 3 structure in the buffer */
+size_t
+ntlm_build_type_3 (char *buf, size_t buflen, unsigned int flags,
+                   const unsigned char *lm_resp, const unsigned char *nt_resp,
+                   const char *domain, const char *user, const char *workstation)
+{
+  size_t offset = T3SIZE;
+  size_t len;
+  char string[256];
+  unsigned char *up;
+
+  if (buflen + 24 + 24 < offset)
+    return 0;
+  memcpy (buf, NTLMSSP, 8);
+  write_uint32 (buf, MSGTYPE, 3);
+  write_string (buf, T3LMRESPONSE, &offset, lm_resp, 24);
+  write_string (buf, T3NTRESPONSE, &offset, nt_resp, 24);
+  up = NULL;
+  len = 0;
+  if (domain != NULL)
+    {
+      len = strlen (domain);
+      if (offset + 2 * len > buflen)
+	return 0;
+      up = nt_unicode (lm_uccpy (string, len, domain), 2 * len);
+    }
+  write_string (buf, T3DOMAIN, &offset, up, 2 * len);
+  if (up != NULL)
+    free (up);
+  up = NULL;
+  len = 0;
+  if (user != NULL)
+    {
+      len = strlen (user);
+      if (offset + 2 * len > buflen)
+	return 0;
+      up = nt_unicode (lm_uccpy (string, len, user), 2 * len);
+    }
+  write_string (buf, T3USER, &offset, up, 2 * len);
+  if (up != NULL)
+    free (up);
+  up = NULL;
+  len = 0;
+  if (workstation != NULL)
+    {
+      len = strlen (workstation);
+      if (offset + 2 * len > buflen)
+	return 0;
+      up = nt_unicode (lm_uccpy (string, len, workstation), 2 * len);
+    }
+  write_string (buf, T3WKSTN, &offset, up, 2 * len);
+  if (up != NULL)
+    free (up);
+  write_string (buf, T3SESSIONKEY, &offset, NULL, 0);
+  write_uint32 (buf, T3FLAGS, flags);
+  return offset;
+}
+
+/****/
+
+/* Parse a NTLM type 2 structure in the buffer (partial implementation).
+   Verify that the packet is a type 2 structure and copy the nonce to the
+   supplied buffer (which must be eight bytes long) */
+size_t
+ntlm_parse_type_2 (const char *buf, size_t buflen, unsigned int *flags,
+                   unsigned char *nonce, char **domain)
+{
+  if (buflen < T2SIZE)
+    return 0;
+  if (memcmp (buf, NTLMSSP, 8) != 0)
+    return 0;
+  if (read_uint32 (buf, MSGTYPE) != 2)
+    return 0;
+  *flags = read_uint32 (buf, T2FLAGS);
+  *domain = NULL;
+  memcpy (nonce, buf + T2NONCE, 8);
+  return 1;
+}
+