/src/samba/auth/ntlmssp/ntlmssp_client.c

Source
/*
   Unix SMB/Netbios implementation.
   Version 3.0
   handle NLTMSSP, client server side parsing

   Copyright (C) Andrew Tridgell      2001
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   Copyright (C) Stefan Metzmacher 2005

   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/>.
*/

struct auth_session_info;

#include "includes.h"
#include "auth/ntlmssp/ntlmssp.h"
#include "../libcli/auth/libcli_auth.h"
#include "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_internal.h"
#include "param/param.h"
#include "auth/ntlmssp/ntlmssp_private.h"
#include "../librpc/gen_ndr/ndr_ntlmssp.h"
#include "../auth/ntlmssp/ntlmssp_ndr.h"
#include "../nsswitch/libwbclient/wbclient.h"

#include "lib/crypto/gnutls_helpers.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH

/*********************************************************************
 Client side NTLMSSP
*********************************************************************/

/**
 * Next state function for the Initial packet
 *
 * @param ntlmssp_state NTLMSSP State
 * @param out_mem_ctx The DATA_BLOB *out will be allocated on this context
 * @param in A NULL data blob (input ignored)
 * @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx
 * @return Errors or NT_STATUS_OK.
 */

NTSTATUS ntlmssp_client_initial(struct gensec_security *gensec_security,
        TALLOC_CTX *out_mem_ctx,
        DATA_BLOB in, DATA_BLOB *out)
{
  struct gensec_ntlmssp_context *gensec_ntlmssp =
    talloc_get_type_abort(gensec_security->private_data,
              struct gensec_ntlmssp_context);
  struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  NTSTATUS status;
  const DATA_BLOB version_blob = ntlmssp_version_blob();

  /* generate the ntlmssp negotiate packet */
  status = msrpc_gen(out_mem_ctx,
      out, "CddAAb",
      "NTLMSSP",
      NTLMSSP_NEGOTIATE,
      ntlmssp_state->neg_flags,
      "", /* domain */
      "", /* workstation */
      version_blob.data, version_blob.length);
  if (!NT_STATUS_IS_OK(status)) {
    DEBUG(0, ("ntlmssp_client_initial: failed to generate "
        "ntlmssp negotiate packet\n"));
    return status;
  }

  if (DEBUGLEVEL >= 10) {
    struct NEGOTIATE_MESSAGE *negotiate = talloc(
      ntlmssp_state, struct NEGOTIATE_MESSAGE);
    if (negotiate != NULL) {
      status = ntlmssp_pull_NEGOTIATE_MESSAGE(
        out, negotiate, negotiate);
      if (NT_STATUS_IS_OK(status)) {
        NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
            negotiate);
      }
      TALLOC_FREE(negotiate);
    }
  }

  ntlmssp_state->negotiate_blob = data_blob_dup_talloc(ntlmssp_state,
                   *out);
  if (ntlmssp_state->negotiate_blob.length != out->length) {
    return NT_STATUS_NO_MEMORY;
  }

  ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;

  return NT_STATUS_MORE_PROCESSING_REQUIRED;
}

NTSTATUS gensec_ntlmssp_resume_ccache(struct gensec_security *gensec_security,
        TALLOC_CTX *out_mem_ctx,
        DATA_BLOB in, DATA_BLOB *out)
{
  struct gensec_ntlmssp_context *gensec_ntlmssp =
    talloc_get_type_abort(gensec_security->private_data,
              struct gensec_ntlmssp_context);
  struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  uint32_t neg_flags = 0;
  uint32_t ntlmssp_command;
  NTSTATUS status;
  bool ok;

  *out = data_blob_null;

  if (in.length == 0) {
    /*
     * This is compat code for older callers
     * which were missing the "initial_blob"/"negotiate_blob".
     *
     * That means we can't calculate the NTLMSSP_MIC
     * field correctly and need to force the
     * old_spnego behaviour.
     */
    DEBUG(10, ("%s: in.length==%u force_old_spnego!\n",
         __func__, (unsigned int)in.length));
    ntlmssp_state->force_old_spnego = true;
    ntlmssp_state->neg_flags |= ntlmssp_state->required_flags;
    ntlmssp_state->required_flags = 0;
    ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
    return NT_STATUS_MORE_PROCESSING_REQUIRED;
  }

  /* parse the NTLMSSP packet */

  ok = msrpc_parse(ntlmssp_state, &in, "Cdd",
       "NTLMSSP",
       &ntlmssp_command,
       &neg_flags);
  if (!ok) {
    DEBUG(1, ("%s: failed to parse NTLMSSP Negotiate of length %u\n",
      __func__, (unsigned int)in.length));
    dump_data(2, in.data, in.length);
    return NT_STATUS_INVALID_PARAMETER;
  }

  if (ntlmssp_command != NTLMSSP_NEGOTIATE) {
    DEBUG(1, ("%s: no NTLMSSP Negotiate message (length %u)\n",
      __func__, (unsigned int)in.length));
    dump_data(2, in.data, in.length);
    return NT_STATUS_INVALID_PARAMETER;
  }

  ntlmssp_state->neg_flags = neg_flags;
  DEBUG(3, ("Imported Negotiate flags:\n"));
  debug_ntlmssp_flags(neg_flags);

  if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
    ntlmssp_state->unicode = true;
  } else {
    ntlmssp_state->unicode = false;
  }

  if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
    gensec_security->want_features |= GENSEC_FEATURE_SIGN;
  }

  if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
    gensec_security->want_features |= GENSEC_FEATURE_SEAL;
  }

  ntlmssp_state->conf_flags = ntlmssp_state->neg_flags;
  ntlmssp_state->required_flags = 0;

  if (DEBUGLEVEL >= 10) {
    struct NEGOTIATE_MESSAGE *negotiate = talloc(
      ntlmssp_state, struct NEGOTIATE_MESSAGE);
    if (negotiate != NULL) {
      status = ntlmssp_pull_NEGOTIATE_MESSAGE(
        &in, negotiate, negotiate);
      if (NT_STATUS_IS_OK(status)) {
        NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
            negotiate);
      }
      TALLOC_FREE(negotiate);
    }
  }

  ntlmssp_state->negotiate_blob = data_blob_dup_talloc(ntlmssp_state,
                   in);
  if (ntlmssp_state->negotiate_blob.length != in.length) {
    return NT_STATUS_NO_MEMORY;
  }

  ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;

  return NT_STATUS_MORE_PROCESSING_REQUIRED;
}

/**
 * Next state function for the Challenge Packet.  Generate an auth packet.
 *
 * @param gensec_security GENSEC state
 * @param out_mem_ctx Memory context for *out
 * @param in The server challnege, as a DATA_BLOB.  reply.data must be NULL
 * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
 * @return Errors or NT_STATUS_OK.
 */

NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
          TALLOC_CTX *out_mem_ctx,
          const DATA_BLOB in, DATA_BLOB *out)
{
  struct gensec_ntlmssp_context *gensec_ntlmssp =
    talloc_get_type_abort(gensec_security->private_data,
              struct gensec_ntlmssp_context);
  struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  uint32_t chal_flags, ntlmssp_command, unkn1 = 0, unkn2 = 0;
  DATA_BLOB server_domain_blob;
  DATA_BLOB challenge_blob;
  DATA_BLOB target_info = {};
  char *server_domain;
  const char *chal_parse_string;
  const char *chal_parse_string_short = NULL;
  const char *auth_gen_string;
  DATA_BLOB lm_response = {};
  DATA_BLOB nt_response = {};
  DATA_BLOB session_key = {};
  DATA_BLOB lm_session_key = {};
  DATA_BLOB encrypted_session_key = {};
  NTSTATUS nt_status;
  int flags = 0;
  const char *user = NULL, *domain = NULL, *workstation = NULL;
  bool is_anonymous = false;
  const DATA_BLOB version_blob = ntlmssp_version_blob();
  const NTTIME *server_timestamp = NULL;
  uint8_t mic_buffer[NTLMSSP_MIC_SIZE] = { 0, };
  DATA_BLOB mic_blob = data_blob_const(mic_buffer, sizeof(mic_buffer));
  gnutls_hmac_hd_t hmac_hnd = NULL;
  int rc;

  TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
  if (!mem_ctx) {
    return NT_STATUS_NO_MEMORY;
  }

  if (!msrpc_parse(mem_ctx,
       &in, "CdBd",
       "NTLMSSP",
       &ntlmssp_command,
       &server_domain_blob,
       &chal_flags)) {
    DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
    dump_data(2, in.data, in.length);
    talloc_free(mem_ctx);

    return NT_STATUS_INVALID_PARAMETER;
  }

  data_blob_free(&server_domain_blob);

  DEBUG(3, ("Got challenge flags:\n"));
  debug_ntlmssp_flags(chal_flags);

  nt_status = ntlmssp_handle_neg_flags(ntlmssp_state,
               chal_flags, "challenge");
  if (!NT_STATUS_IS_OK(nt_status)) {
    return nt_status;
  }

  if (ntlmssp_state->unicode) {
    if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
      chal_parse_string = "CdUdbddB";
    } else {
      chal_parse_string = "CdUdbdd";
      chal_parse_string_short = "CdUdb";
    }
    auth_gen_string = "CdBBUUUBdbb";
  } else {
    if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
      chal_parse_string = "CdAdbddB";
    } else {
      chal_parse_string = "CdAdbdd";
      chal_parse_string_short = "CdAdb";
    }

    auth_gen_string = "CdBBAAABdbb";
  }

  if (!msrpc_parse(mem_ctx,
       &in, chal_parse_string,
       "NTLMSSP",
       &ntlmssp_command,
       &server_domain,
       &chal_flags,
       &challenge_blob, 8,
       &unkn1, &unkn2,
       &target_info)) {

    bool ok = false;

    DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));

    if (chal_parse_string_short != NULL) {
      /*
       * In the case where NTLMSSP_NEGOTIATE_TARGET_INFO
       * is not used, some NTLMSSP servers don't return
       * the unused unkn1 and unkn2 fields.
       * See bug:
       * https://bugzilla.samba.org/show_bug.cgi?id=10016
       * for packet traces.
       * Try and parse again without them.
       */
      ok = msrpc_parse(mem_ctx,
        &in, chal_parse_string_short,
        "NTLMSSP",
        &ntlmssp_command,
        &server_domain,
        &chal_flags,
        &challenge_blob, 8);
      if (!ok) {
        DEBUG(1, ("Failed to short parse "
          "the NTLMSSP Challenge: (#2)\n"));
      }
    }

    if (!ok) {
      dump_data(2, in.data, in.length);
      talloc_free(mem_ctx);
      return NT_STATUS_INVALID_PARAMETER;
    }
  }

  if (DEBUGLEVEL >= 10) {
    struct CHALLENGE_MESSAGE *challenge =
      talloc(ntlmssp_state, struct CHALLENGE_MESSAGE);
    if (challenge != NULL) {
      NTSTATUS status;
      challenge->NegotiateFlags = chal_flags;
      status = ntlmssp_pull_CHALLENGE_MESSAGE(
          &in, challenge, challenge);
      if (NT_STATUS_IS_OK(status)) {
        NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
            challenge);
      }
      TALLOC_FREE(challenge);
    }
  }

  if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
    ntlmssp_state->server.is_standalone = true;
  } else {
    ntlmssp_state->server.is_standalone = false;
  }
  /* TODO: parse struct_blob and fill in the rest */
  ntlmssp_state->server.netbios_name = "";
  ntlmssp_state->server.netbios_domain = talloc_move(ntlmssp_state, &server_domain);
  ntlmssp_state->server.dns_name = "";
  ntlmssp_state->server.dns_domain = "";

  if (challenge_blob.length != 8) {
    talloc_free(mem_ctx);
    return NT_STATUS_INVALID_PARAMETER;
  }

  is_anonymous = cli_credentials_is_anonymous(gensec_security->credentials);
  cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
             &user, &domain);

  workstation = cli_credentials_get_workstation(gensec_security->credentials);

  if (user == NULL) {
    DEBUG(10, ("User is NULL, returning INVALID_PARAMETER\n"));
    return NT_STATUS_INVALID_PARAMETER;
  }

  if (domain == NULL) {
    DEBUG(10, ("Domain is NULL, returning INVALID_PARAMETER\n"));
    return NT_STATUS_INVALID_PARAMETER;
  }

  if (workstation == NULL) {
    DEBUG(10, ("Workstation is NULL, returning INVALID_PARAMETER\n"));
    return NT_STATUS_INVALID_PARAMETER;
  }

  if (is_anonymous) {
    ntlmssp_state->neg_flags |= NTLMSSP_ANONYMOUS;
    /*
     * don't use the ccache for anonymous auth
     */
    ntlmssp_state->use_ccache = false;
  }
  if (ntlmssp_state->use_ccache) {
    struct samr_Password *nt_hash = NULL;

    /*
     * If we have a password given we don't
     * use the ccache
     */
    nt_hash = cli_credentials_get_nt_hash(gensec_security->credentials,
                  mem_ctx);
    if (nt_hash != NULL) {
      TALLOC_FREE(nt_hash);
      ntlmssp_state->use_ccache = false;
    }
  }

  if (ntlmssp_state->use_ccache) {
    struct wbcCredentialCacheParams params;
    struct wbcCredentialCacheInfo *info = NULL;
    struct wbcAuthErrorInfo *error = NULL;
    struct wbcNamedBlob auth_blobs[2];
    const struct wbcBlob *wbc_auth_blob = NULL;
    const struct wbcBlob *wbc_session_key = NULL;
    wbcErr wbc_status;
    size_t i;
    bool new_spnego = false;

    params.account_name = user;
    params.domain_name = domain;
    params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;

    auth_blobs[0].name = "challenge_blob";
    auth_blobs[0].flags = 0;
    auth_blobs[0].blob.data = in.data;
    auth_blobs[0].blob.length = in.length;
    auth_blobs[1].name = "negotiate_blob";
    auth_blobs[1].flags = 0;
    auth_blobs[1].blob.data = ntlmssp_state->negotiate_blob.data;
    auth_blobs[1].blob.length = ntlmssp_state->negotiate_blob.length;
    params.num_blobs = ARRAY_SIZE(auth_blobs);
    params.blobs = auth_blobs;

    wbc_status = wbcCredentialCache(&params, &info, &error);
    wbcFreeMemory(error);
    if (!WBC_ERROR_IS_OK(wbc_status)) {
      return NT_STATUS_WRONG_CREDENTIAL_HANDLE;
    }

    for (i=0; i<info->num_blobs; i++) {
      if (strequal(info->blobs[i].name, "auth_blob")) {
        wbc_auth_blob = &info->blobs[i].blob;
      }
      if (strequal(info->blobs[i].name, "session_key")) {
        wbc_session_key = &info->blobs[i].blob;
      }
      if (strequal(info->blobs[i].name, "new_spnego")) {
        new_spnego = true;
      }
    }
    if ((wbc_auth_blob == NULL) || (wbc_session_key == NULL)) {
      wbcFreeMemory(info);
      return NT_STATUS_WRONG_CREDENTIAL_HANDLE;
    }

    session_key = data_blob_talloc_s(mem_ctx,
             wbc_session_key->data,
             wbc_session_key->length);
    if (session_key.length != wbc_session_key->length) {
      wbcFreeMemory(info);
      return NT_STATUS_NO_MEMORY;
    }
    *out = data_blob_talloc_s(mem_ctx,
            wbc_auth_blob->data,
            wbc_auth_blob->length);
    if (out->length != wbc_auth_blob->length) {
      wbcFreeMemory(info);
      return NT_STATUS_NO_MEMORY;
    }
    ntlmssp_state->new_spnego = new_spnego;

    wbcFreeMemory(info);
    goto done;
  }

  if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
    flags |= CLI_CRED_NTLM2;
  }
  if (ntlmssp_state->use_ntlmv2) {
    flags |= CLI_CRED_NTLMv2_AUTH;
  }
  if (ntlmssp_state->use_nt_response) {
    flags |= CLI_CRED_NTLM_AUTH;
  }
  if (ntlmssp_state->allow_lm_response) {
    flags |= CLI_CRED_LANMAN_AUTH;
  }

  if (target_info.length != 0 && !is_anonymous) {
    struct AV_PAIR *pairs = NULL;
    uint32_t count = 0;
    enum ndr_err_code err;
    struct AV_PAIR *timestamp = NULL;
    struct AV_PAIR *eol = NULL;
    uint32_t i = 0;
    const char *service = NULL;
    const char *hostname = NULL;

    err = ndr_pull_struct_blob(&target_info,
          ntlmssp_state,
          &ntlmssp_state->server.av_pair_list,
          (ndr_pull_flags_fn_t)ndr_pull_AV_PAIR_LIST);
    if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
      return ndr_map_error2ntstatus(err);
    }

    count = ntlmssp_state->server.av_pair_list.count;
    /*
     * We need room for Flags, SingleHost,
     * ChannelBindings and Target
     */
    pairs = talloc_zero_array(ntlmssp_state, struct AV_PAIR,
            count + 4);
    if (pairs == NULL) {
      return NT_STATUS_NO_MEMORY;
    }

    for (i = 0; i < count; i++) {
      pairs[i] = ntlmssp_state->server.av_pair_list.pair[i];
    }

    ntlmssp_state->client.av_pair_list.count = count;
    ntlmssp_state->client.av_pair_list.pair = pairs;

    eol = ndr_ntlmssp_find_av(&ntlmssp_state->client.av_pair_list,
            MsvAvEOL);
    if (eol == NULL) {
      return NT_STATUS_INVALID_PARAMETER;
    }

    timestamp = ndr_ntlmssp_find_av(&ntlmssp_state->client.av_pair_list,
            MsvAvTimestamp);
    if (timestamp != NULL) {
      uint32_t sign_features =
          GENSEC_FEATURE_SESSION_KEY |
          GENSEC_FEATURE_SIGN |
          GENSEC_FEATURE_SEAL;

      server_timestamp = &timestamp->Value.AvTimestamp;

      if (ntlmssp_state->force_old_spnego) {
        sign_features = 0;
      }

      if (gensec_security->want_features & sign_features) {
        struct AV_PAIR *av_flags = NULL;

        av_flags = ndr_ntlmssp_find_av(&ntlmssp_state->client.av_pair_list,
                     MsvAvFlags);
        if (av_flags == NULL) {
          av_flags = eol;
          eol++;
          count++;
          *eol = *av_flags;
          av_flags->AvId = MsvAvFlags;
          av_flags->Value.AvFlags = 0;
        }

        av_flags->Value.AvFlags |= NTLMSSP_AVFLAG_MIC_IN_AUTHENTICATE_MESSAGE;
        ntlmssp_state->new_spnego = true;
      }
    }

    {
      struct AV_PAIR *SingleHost = NULL;

      SingleHost = eol;
      eol++;
      count++;
      *eol = *SingleHost;

      /*
       * This is not really used, but we want to
       * add some more random bytes and match
       * Windows.
       */
      SingleHost->AvId = MsvAvSingleHost;
      SingleHost->Value.AvSingleHost.token_info.Flags = 0;
      SingleHost->Value.AvSingleHost.token_info.TokenIL = 0;
      generate_random_buffer(SingleHost->Value.AvSingleHost.token_info.MachineId,
          sizeof(SingleHost->Value.AvSingleHost.token_info.MachineId));
      SingleHost->Value.AvSingleHost.remaining = data_blob_null;
    }

    if (!(gensec_security->want_features & GENSEC_FEATURE_CB_OPTIONAL)
        || gensec_security->channel_bindings != NULL)
    {
      struct AV_PAIR *ChannelBindings = NULL;

      ChannelBindings = eol;
      eol++;
      count++;
      *eol = *ChannelBindings;

      ChannelBindings->AvId = MsvChannelBindings;
      nt_status = ntlmssp_hash_channel_bindings(gensec_security,
          ChannelBindings->Value.ChannelBindings);
      if (!NT_STATUS_IS_OK(nt_status)) {
        return nt_status;
      }
    }

    service = gensec_get_target_service(gensec_security);
    hostname = gensec_get_target_hostname(gensec_security);
    if (service != NULL && hostname != NULL) {
      struct AV_PAIR *target = NULL;

      target = eol;
      eol++;
      count++;
      *eol = *target;

      target->AvId = MsvAvTargetName;
      target->Value.AvTargetName = talloc_asprintf(pairs, "%s/%s",
                     service,
                     hostname);
      if (target->Value.AvTargetName == NULL) {
        return NT_STATUS_NO_MEMORY;
      }
    }

    ntlmssp_state->client.av_pair_list.count = count;
    ntlmssp_state->client.av_pair_list.pair = pairs;

    err = ndr_push_struct_blob(&target_info,
          ntlmssp_state,
          &ntlmssp_state->client.av_pair_list,
          (ndr_push_flags_fn_t)ndr_push_AV_PAIR_LIST);
    if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
      return NT_STATUS_NO_MEMORY;
    }
  }

  nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
                  &flags, challenge_blob,
                  server_timestamp, target_info,
                  &lm_response, &nt_response,
                  &lm_session_key, &session_key);
  if (!NT_STATUS_IS_OK(nt_status)) {
    return nt_status;
  }

  if (!(flags & CLI_CRED_LANMAN_AUTH)) {
    /* LM Key is still possible, just silly, so we do not
     * allow it. Fortunately all LM crypto is off by
     * default and we require command line options to end
     * up here */
    ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
  }

  if (!(flags & CLI_CRED_NTLM2)) {
    /* NTLM2 is incompatible... */
    ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
  }

  if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
      && ntlmssp_state->allow_lm_key && lm_session_key.length == 16) {
    DATA_BLOB new_session_key = data_blob_talloc_s(mem_ctx,
                     NULL,
                     16);
    if (new_session_key.data == NULL) {
      return NT_STATUS_NO_MEMORY;
    }
    if (lm_response.length == 24) {
      nt_status = SMBsesskeygen_lm_sess_key(lm_session_key.data,
                    lm_response.data,
                    new_session_key.data);
      if (!NT_STATUS_IS_OK(nt_status)) {
        return nt_status;
      }
    } else {
      static const uint8_t zeros[24];
      nt_status = SMBsesskeygen_lm_sess_key(lm_session_key.data,
                                                              zeros,
                                                              new_session_key.data);
      if (!NT_STATUS_IS_OK(nt_status)) {
        return nt_status;
      }
    }
    session_key = new_session_key;
    dump_data_pw("LM session key\n", session_key.data, session_key.length);
  }


  /* Key exchange encryptes a new client-generated session key with
     the password-derived key */
  if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
    /* Make up a new session key */
    uint8_t client_session_key[16];
    gnutls_cipher_hd_t cipher_hnd;
    gnutls_datum_t enc_session_key = {
      .data = session_key.data,
      .size = session_key.length,
    };

    generate_random_buffer(client_session_key, sizeof(client_session_key));

    /* Encrypt the new session key with the old one */
    encrypted_session_key = data_blob_talloc_s(ntlmssp_state,
               client_session_key, sizeof(client_session_key));
    if (encrypted_session_key.data == NULL) {
      nt_status = NT_STATUS_NO_MEMORY;
      ZERO_ARRAY(client_session_key);
      goto done;
    }
    dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);

    rc = gnutls_cipher_init(&cipher_hnd,
          GNUTLS_CIPHER_ARCFOUR_128,
          &enc_session_key,
          NULL);
    if (rc < 0) {
      nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
      ZERO_ARRAY(client_session_key);
      goto done;
    }
    rc = gnutls_cipher_encrypt(cipher_hnd,
             encrypted_session_key.data,
             encrypted_session_key.length);
    gnutls_cipher_deinit(cipher_hnd);
    if (rc < 0) {
      nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
      ZERO_ARRAY(client_session_key);
      goto done;
    }

    dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);

    /* Mark the new session key as the 'real' session key */
    session_key = data_blob_talloc_s(mem_ctx,
             client_session_key,
             sizeof(client_session_key));
    ZERO_ARRAY(client_session_key);
    if (session_key.data == NULL) {
      nt_status = NT_STATUS_NO_MEMORY;
      goto done;
    }
  }

  /* this generates the actual auth packet */
  nt_status = msrpc_gen(mem_ctx,
           out, auth_gen_string,
           "NTLMSSP",
           NTLMSSP_AUTH,
           lm_response.data, lm_response.length,
           nt_response.data, nt_response.length,
           domain,
           user,
           workstation,
           encrypted_session_key.data, encrypted_session_key.length,
           ntlmssp_state->neg_flags,
           version_blob.data, version_blob.length,
           mic_blob.data, mic_blob.length);
  if (!NT_STATUS_IS_OK(nt_status)) {
    talloc_free(mem_ctx);
    return nt_status;
  }

  if (DEBUGLEVEL >= 10) {
    struct AUTHENTICATE_MESSAGE *authenticate =
      talloc(ntlmssp_state, struct AUTHENTICATE_MESSAGE);
    if (authenticate != NULL) {
      NTSTATUS status;
      authenticate->NegotiateFlags = ntlmssp_state->neg_flags;
      status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
        out, authenticate, authenticate);
      if (NT_STATUS_IS_OK(status)) {
        NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
            authenticate);
      }
      TALLOC_FREE(authenticate);
    }
  }

  /*
   * We always include the MIC, even without:
   * av_flags->Value.AvFlags |= NTLMSSP_AVFLAG_MIC_IN_AUTHENTICATE_MESSAGE;
   * ntlmssp_state->new_spnego = true;
   *
   * This matches a Windows client.
   */
  rc = gnutls_hmac_init(&hmac_hnd,
            GNUTLS_MAC_MD5,
       session_key.data,
       MIN(session_key.length, 64));
  if (rc < 0) {
    nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
    goto done;
  }

  rc = gnutls_hmac(hmac_hnd,
       ntlmssp_state->negotiate_blob.data,
       ntlmssp_state->negotiate_blob.length);
  if (rc < 0) {
    gnutls_hmac_deinit(hmac_hnd, NULL);
    nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
    goto done;
  }
  rc = gnutls_hmac(hmac_hnd, in.data, in.length);
  if (rc < 0) {
    gnutls_hmac_deinit(hmac_hnd, NULL);
    nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
    goto done;
  }
  rc = gnutls_hmac(hmac_hnd, out->data, out->length);
  if (rc < 0) {
    gnutls_hmac_deinit(hmac_hnd, NULL);
    nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
    goto done;
  }

  gnutls_hmac_deinit(hmac_hnd, mic_buffer);

  memcpy(out->data + NTLMSSP_MIC_OFFSET, mic_buffer, NTLMSSP_MIC_SIZE);
  ZERO_ARRAY(mic_buffer);

  nt_status = NT_STATUS_OK;
done:
  ZERO_ARRAY_LEN(ntlmssp_state->negotiate_blob.data,
           ntlmssp_state->negotiate_blob.length);
  data_blob_free(&ntlmssp_state->negotiate_blob);

  ntlmssp_state->session_key = session_key;
  talloc_steal(ntlmssp_state, session_key.data);

  DEBUG(3, ("NTLMSSP: Set final flags:\n"));
  debug_ntlmssp_flags(ntlmssp_state->neg_flags);

  talloc_steal(out_mem_ctx, out->data);

  ntlmssp_state->expected_state = NTLMSSP_DONE;

  if (gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
    nt_status = ntlmssp_sign_init(ntlmssp_state);
    if (!NT_STATUS_IS_OK(nt_status)) {
      DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
          nt_errstr(nt_status)));
      talloc_free(mem_ctx);
      return nt_status;
    }
  }

  talloc_free(mem_ctx);
  return nt_status;
}

NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
{
  struct gensec_ntlmssp_context *gensec_ntlmssp;
  struct ntlmssp_state *ntlmssp_state;
  NTSTATUS nt_status;

  nt_status = gensec_ntlmssp_start(gensec_security);
  NT_STATUS_NOT_OK_RETURN(nt_status);

  gensec_ntlmssp =
    talloc_get_type_abort(gensec_security->private_data,
              struct gensec_ntlmssp_context);

  ntlmssp_state = talloc_zero(gensec_ntlmssp,
            struct ntlmssp_state);
  if (!ntlmssp_state) {
    return NT_STATUS_NO_MEMORY;
  }

  gensec_ntlmssp->ntlmssp_state = ntlmssp_state;

  ntlmssp_state = gensec_ntlmssp->ntlmssp_state;

  ntlmssp_state->role = NTLMSSP_CLIENT;

  ntlmssp_state->client.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
  ntlmssp_state->client.netbios_name = cli_credentials_get_workstation(gensec_security->credentials);

  ntlmssp_state->unicode = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "unicode", true);

  ntlmssp_state->use_nt_response = \
    gensec_setting_bool(gensec_security->settings,
            "ntlmssp_client",
            "send_nt_response",
            true);

  ntlmssp_state->allow_lm_response = lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx);

  ntlmssp_state->allow_lm_key = (ntlmssp_state->allow_lm_response
                && (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "allow_lm_key", false)
              || gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)));

  ntlmssp_state->use_ntlmv2 = lpcfg_client_ntlmv2_auth(gensec_security->settings->lp_ctx);

  ntlmssp_state->force_old_spnego = gensec_setting_bool(gensec_security->settings,
            "ntlmssp_client", "force_old_spnego", false);

  ntlmssp_state->expected_state = NTLMSSP_INITIAL;

  ntlmssp_state->neg_flags =
    NTLMSSP_NEGOTIATE_NTLM |
    NTLMSSP_NEGOTIATE_VERSION |
    NTLMSSP_REQUEST_TARGET;

  if (ntlmssp_state->unicode) {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
  } else {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "128bit", true)) {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "56bit", false)) {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)) {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "keyexchange", true)) {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "alwayssign", true)) {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "ntlm2", true)) {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
  } else {
    /* apparently we can't do ntlmv2 if we don't do ntlm2 */
    ntlmssp_state->use_ntlmv2 = false;
  }

  if (ntlmssp_state->use_ntlmv2) {
    ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_NTLM2;
    ntlmssp_state->allow_lm_response = false;
    ntlmssp_state->allow_lm_key = false;
  }

  if (ntlmssp_state->allow_lm_key) {
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
  }

  if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
    /*
     * We need to set this to allow a later SetPassword
     * via the SAMR pipe to succeed. Strange.... We could
     * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
     *
     * Without this, Windows will not create the master key
     * that it thinks is only used for NTLMSSP signing and
     * sealing.  (It is actually pulled out and used directly)
     *
     * We don't require this here as some servers (e.g. NetAPP)
     * doesn't support this.
     */
    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
  }
  if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
    ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_SIGN;

    if (gensec_security->want_features & GENSEC_FEATURE_LDAP_STYLE) {
      /*
       * We need to handle NTLMSSP_NEGOTIATE_SIGN as
       * NTLMSSP_NEGOTIATE_SEAL if GENSEC_FEATURE_LDAP_STYLE
       * is requested.
       */
      ntlmssp_state->force_wrap_seal = true;
    }
  }
  if (ntlmssp_state->force_wrap_seal) {
    bool ret;

    /*
     * We want also work against old Samba servers
     * which didn't had GENSEC_FEATURE_LDAP_STYLE
     * we negotiate SEAL too. We may remove this
     * in a few years. As all servers should have
     * GENSEC_FEATURE_LDAP_STYLE by then.
     */
    ret = gensec_setting_bool(gensec_security->settings,
            "ntlmssp_client",
            "ldap_style_send_seal",
            true);
    if (ret) {
      ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_SEAL;
    }
  }
  if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
    ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_SIGN;
    ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_SEAL;
  }
  if (gensec_security->want_features & GENSEC_FEATURE_NTLM_CCACHE) {
    ntlmssp_state->use_ccache = true;
  }

  ntlmssp_state->neg_flags |= ntlmssp_state->required_flags;
  ntlmssp_state->conf_flags = ntlmssp_state->neg_flags;

  return NT_STATUS_OK;
}

NTSTATUS gensec_ntlmssp_resume_ccache_start(struct gensec_security *gensec_security)
{
  struct gensec_ntlmssp_context *gensec_ntlmssp = NULL;
  NTSTATUS status;

  status = gensec_ntlmssp_client_start(gensec_security);
  if (!NT_STATUS_IS_OK(status)) {
    return status;
  }

  gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
                 struct gensec_ntlmssp_context);
  gensec_ntlmssp->ntlmssp_state->use_ccache = false;
  gensec_ntlmssp->ntlmssp_state->resume_ccache = true;
  gensec_ntlmssp->ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;

  return NT_STATUS_OK;
}

Coverage Report

Created: 2026-07-25 07:00