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winbindd_pam.c

/* 
   Unix SMB/CIFS implementation.

   Winbind daemon - pam auth funcions

   Copyright (C) Andrew Tridgell 2000
   Copyright (C) Tim Potter 2001
   Copyright (C) Andrew Bartlett 2001-2002
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "winbindd.h"

/* Return a password structure from a username.  */

enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state) 
{
      NTSTATUS result;
      fstring name_domain, name_user;
      int passlen;
      unsigned char trust_passwd[16];
      time_t last_change_time;
        uint32 smb_uid_low;
        NET_USER_INFO_3 info3;
        struct cli_state *cli = NULL;
      uchar chal[8];
      TALLOC_CTX *mem_ctx = NULL;
      DATA_BLOB lm_resp;
      DATA_BLOB nt_resp;

      extern pstring global_myname;

      DEBUG(3, ("[%5d]: pam auth %s\n", state->pid,
              state->request.data.auth.user));

      if (!(mem_ctx = talloc_init_named("winbind pam auth for %s", state->request.data.auth.user))) {
            DEBUG(0, ("winbindd_pam_auth: could not talloc_init()!\n"));
            result = NT_STATUS_NO_MEMORY;
            goto done;
      }

      /* Parse domain and username */
      
      if (!parse_domain_user(state->request.data.auth.user, name_domain, 
                         name_user)) {
            DEBUG(5,("no domain separator (%s) in username (%s) - failing auth\n", lp_winbind_separator(), state->request.data.auth.user));
            result = NT_STATUS_INVALID_PARAMETER;
            goto done;
      }

      passlen = strlen(state->request.data.auth.pass);
            
      {
            unsigned char local_lm_response[24];
            unsigned char local_nt_response[24];
            
            generate_random_buffer(chal, 8, False);
            SMBencrypt(state->request.data.auth.pass, chal, local_lm_response);
            
            SMBNTencrypt(state->request.data.auth.pass, chal, local_nt_response);

            lm_resp = data_blob_talloc(mem_ctx, local_lm_response, sizeof(local_lm_response));
            nt_resp = data_blob_talloc(mem_ctx, local_nt_response, sizeof(local_nt_response));
      }
      
      /*
       * Get the machine account password for our primary domain
       */

      if (!secrets_fetch_trust_account_password(
                lp_workgroup(), trust_passwd, &last_change_time)) {
            DEBUG(0, ("winbindd_pam_auth: could not fetch trust account password for domain %s\n", lp_workgroup()));
            result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
            goto done;
      }

      /* We really don't care what LUID we give the user. */

      generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);

      ZERO_STRUCT(info3);
      
      /* Don't shut this down - it belongs to the connection cache code */
        result = cm_get_netlogon_cli(lp_workgroup(), trust_passwd, &cli);

        if (!NT_STATUS_IS_OK(result)) {
                DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
                goto done;
        }

      result = cli_netlogon_sam_network_logon(cli, mem_ctx,
                                    name_user, name_domain, 
                                    global_myname, chal, 
                                    lm_resp, nt_resp, 
                                    &info3);
        
done:

      state->response.data.auth.nt_status = NT_STATUS_V(result);
      fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
      fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
      state->response.data.auth.pam_error = nt_status_to_pam(result);

      DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n", 
            state->request.data.auth.user, 
            state->response.data.auth.nt_status_string,
            state->response.data.auth.pam_error));          

      if (mem_ctx) 
            talloc_destroy(mem_ctx);
      
      return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
}
      
#ifdef WITH_WINBIND_AUTH_CRAP
/* Challenge Response Authentication Protocol */

enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state) 
{
      NTSTATUS result;
      unsigned char trust_passwd[16];
      time_t last_change_time;
        NET_USER_INFO_3 info3;
        struct cli_state *cli = NULL;
      TALLOC_CTX *mem_ctx = NULL;
      const char *domain = NULL;

      DATA_BLOB lm_resp, nt_resp;

      extern pstring global_myname;

      DEBUG(3, ("[%5d]: pam auth crap domain: %s user: %s\n", state->pid,
              state->request.data.auth_crap.domain, state->request.data.auth_crap.user));

      if (!(mem_ctx = talloc_init_named("winbind pam auth crap for %s", state->request.data.auth_crap.user))) {
            DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
            result = NT_STATUS_NO_MEMORY;
            goto done;
      }

      if (*state->request.data.auth_crap.domain) {
            domain = talloc_strdup(mem_ctx, state->request.data.auth_crap.domain);
      } else if (lp_winbind_use_default_domain()) {
            domain = talloc_strdup(mem_ctx, lp_workgroup());
      } else {
            DEBUG(5,("no domain specified with username (%s) - failing auth\n", state->request.data.auth_crap.user));
            result = NT_STATUS_INVALID_PARAMETER;
            goto done;
      }

      if (!domain) {
            DEBUG(0,("winbindd_pam_auth_crap: talloc_strdup failed!\n"));
            result = NT_STATUS_NO_MEMORY;
            goto done;
      }

      lm_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
      nt_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
      
      /*
       * Get the machine account password for our primary domain
       */

      if (!secrets_fetch_trust_account_password(
                lp_workgroup(), trust_passwd, &last_change_time)) {
            DEBUG(0, ("winbindd_pam_auth: could not fetch trust account password for domain %s\n", lp_workgroup()));
            result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
            goto done;
      }

      ZERO_STRUCT(info3);

      /* Don't shut this down - it belongs to the connection cache code */
        result = cm_get_netlogon_cli(lp_workgroup(), trust_passwd, &cli);

        if (!NT_STATUS_IS_OK(result)) {
                DEBUG(3, ("could not open handle to NETLOGON pipe (%s)\n", nt_errstr(result)));
                goto done;
        }

      result = cli_netlogon_sam_network_logon(cli, mem_ctx,
                                    state->request.data.auth_crap.user, domain,
                                    global_myname, state->request.data.auth_crap.chal, 
                                    lm_resp, nt_resp, 
                                    &info3);
        
done:

      state->response.data.auth.nt_status = NT_STATUS_V(result);
      fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
      fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
      state->response.data.auth.pam_error = nt_status_to_pam(result);

      DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n", 
            state->request.data.auth_crap.domain, 
            state->request.data.auth_crap.user, 
            state->response.data.auth.nt_status_string,
            state->response.data.auth.pam_error));          

      if (mem_ctx) 
            talloc_destroy(mem_ctx);
      
      return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
}

#endif      /* WITH_WINBIND_AUTH_CRAP */

/* Change a user password */

enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
{
      NTSTATUS result;
      char *oldpass, *newpass;
      fstring domain, user;
      CLI_POLICY_HND *hnd;

      DEBUG(3, ("[%5d]: pam chauthtok %s\n", state->pid,
            state->request.data.chauthtok.user));

      /* Setup crap */

      if (state == NULL)
            return WINBINDD_ERROR;

      if (!parse_domain_user(state->request.data.chauthtok.user, domain, 
                         user)) {
            result = NT_STATUS_INVALID_PARAMETER;
            goto done;
      }

      /* Change password */

      oldpass = state->request.data.chauthtok.oldpass;
      newpass = state->request.data.chauthtok.newpass;

      /* Get sam handle */

      if (!NT_STATUS_IS_OK(result = cm_get_sam_handle(domain, &hnd))) {
            DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
            goto done;
      }

      if (!cli_oem_change_password(hnd->cli, user, newpass, oldpass)) {
            DEBUG(1, ("password change failed for user %s/%s\n", domain, 
                    user));
            result = NT_STATUS_WRONG_PASSWORD;
      } else
            result = NT_STATUS_OK;

done:    
      state->response.data.auth.nt_status = NT_STATUS_V(result);
      fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
      fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
      state->response.data.auth.pam_error = nt_status_to_pam(result);

      return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
}

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