source3/auth/auth_generic.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle GENSEC authentication, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2003,2011
   8    Copyright (C) Simo Sorce 2010.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "auth.h"
  26 #include "../lib/tsocket/tsocket.h"
  27 #include "auth/gensec/gensec.h"
  28 #include "lib/param/param.h"
  29 #ifdef HAVE_KRB5
  30 #include "libcli/auth/krb5_wrap.h"
  31 #endif
  32
  33 static NTSTATUS auth3_generate_session_info_pac(struct auth4_context *auth_ctx,
  34                                                 TALLOC_CTX *mem_ctx,
  35                                                 struct smb_krb5_context *smb_krb5_context,
  36                                                 DATA_BLOB *pac_blob,
  37                                                 const char *princ_name,
  38                                                 const struct tsocket_address *remote_address,
  39                                                 uint32_t session_info_flags,
  40                                                 struct auth_session_info **session_info)
  41 {
  42         TALLOC_CTX *tmp_ctx;
  43         struct PAC_DATA *pac_data = NULL;
  44         struct PAC_LOGON_INFO *logon_info = NULL;
  45         unsigned int i;
  46         bool is_mapped;
  47         bool is_guest;
  48         char *ntuser;
  49         char *ntdomain;
  50         char *username;
  51         char *rhost;
  52         struct passwd *pw;
  53         NTSTATUS status;
  54         int rc;
  55
  56         tmp_ctx = talloc_new(mem_ctx);
  57         if (!tmp_ctx) {
  58                 return NT_STATUS_NO_MEMORY;
  59         }
  60
  61         if (pac_blob) {
  62 #ifdef HAVE_KRB5
  63                 status = kerberos_decode_pac(tmp_ctx,
  64                                      *pac_blob,
  65                                      NULL, NULL, NULL, NULL, 0, &pac_data);
  66 #else
  67                 status = NT_STATUS_ACCESS_DENIED;
  68 #endif
  69                 if (!NT_STATUS_IS_OK(status)) {
  70                         goto done;
  71                 }
  72
  73                 /* get logon name and logon info */
  74                 for (i = 0; i < pac_data->num_buffers; i++) {
  75                         struct PAC_BUFFER *data_buf = &pac_data->buffers[i];
  76
  77                         switch (data_buf->type) {
  78                         case PAC_TYPE_LOGON_INFO:
  79                                 if (!data_buf->info) {
  80                                         break;
  81                                 }
  82                                 logon_info = data_buf->info->logon_info.info;
  83                                 break;
  84                         default:
  85                                 break;
  86                         }
  87                 }
  88                 if (!logon_info) {
  89                         DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
  90                         status = NT_STATUS_NOT_FOUND;
  91                         goto done;
  92                 }
  93         }
  94
  95         rc = get_remote_hostname(remote_address,
  96                                  &rhost,
  97                                  tmp_ctx);
  98         if (rc < 0) {
  99                 status = NT_STATUS_NO_MEMORY;
 100                 goto done;
 101         }
 102         if (strequal(rhost, "UNKNOWN")) {
 103                 rhost = tsocket_address_inet_addr_string(remote_address,
 104                                                          tmp_ctx);
 105                 if (rhost == NULL) {
 106                         status = NT_STATUS_NO_MEMORY;
 107                         goto done;
 108                 }
 109         }
 110
 111         status = get_user_from_kerberos_info(tmp_ctx, rhost,
 112                                              princ_name, logon_info,
 113                                              &is_mapped, &is_guest,
 114                                              &ntuser, &ntdomain,
 115                                              &username, &pw);
 116         if (!NT_STATUS_IS_OK(status)) {
 117                 DEBUG(1, ("Failed to map kerberos principal to system user "
 118                           "(%s)\n", nt_errstr(status)));
 119                 status = NT_STATUS_ACCESS_DENIED;
 120                 goto done;
 121         }
 122
 123         /* TODO: save PAC data in netsamlogon cache ? */
 124
 125         status = make_session_info_krb5(mem_ctx,
 126                                         ntuser, ntdomain, username, pw,
 127                                         logon_info, is_guest, is_mapped, NULL /* No session key for now, caller will sort it out */,
 128                                         session_info);
 129         if (!NT_STATUS_IS_OK(status)) {
 130                 DEBUG(1, ("Failed to map kerberos pac to server info (%s)\n",
 131                           nt_errstr(status)));
 132                 status = NT_STATUS_ACCESS_DENIED;
 133                 goto done;
 134         }
 135
 136         DEBUG(5, (__location__ "OK: user: %s domain: %s client: %s\n",
 137                   ntuser, ntdomain, rhost));
 138
 139         status = NT_STATUS_OK;
 140
 141 done:
 142         TALLOC_FREE(tmp_ctx);
 143         return status;
 144 }
 145
 146 NTSTATUS auth_generic_prepare(TALLOC_CTX *mem_ctx,
 147                               const struct tsocket_address *remote_address,
 148                               struct gensec_security **gensec_security_out)
 149 {
 150         struct gensec_security *gensec_security;
 151         struct auth_context *auth_context;
 152         NTSTATUS nt_status;
 153
 154         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 155         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 156
 157         nt_status = make_auth_context_subsystem(tmp_ctx, &auth_context);
 158         if (!NT_STATUS_IS_OK(nt_status)) {
 159                 TALLOC_FREE(tmp_ctx);
 160                 return nt_status;
 161         }
 162
 163         if (auth_context->prepare_gensec) {
 164                 nt_status = auth_context->prepare_gensec(tmp_ctx,
 165                                                          &gensec_security);
 166                 if (!NT_STATUS_IS_OK(nt_status)) {
 167                         TALLOC_FREE(tmp_ctx);
 168                         return nt_status;
 169                 }
 170         } else {
 171                 struct gensec_settings *gensec_settings;
 172                 struct loadparm_context *lp_ctx;
 173
 174                 struct auth4_context *auth4_context = talloc_zero(tmp_ctx, struct auth4_context);
 175                 if (auth4_context == NULL) {
 176                         DEBUG(10, ("failed to allocate auth4_context failed\n"));
 177                         TALLOC_FREE(tmp_ctx);
 178                         return NT_STATUS_NO_MEMORY;
 179                 }
 180                 auth4_context->generate_session_info_pac = auth3_generate_session_info_pac;
 181
 182                 lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_context());
 183                 if (lp_ctx == NULL) {
 184                         DEBUG(10, ("loadparm_init_s3 failed\n"));
 185                         TALLOC_FREE(tmp_ctx);
 186                         return NT_STATUS_INVALID_SERVER_STATE;
 187                 }
 188
 189                 gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
 190                 if (lp_ctx == NULL) {
 191                         DEBUG(10, ("lpcfg_gensec_settings failed\n"));
 192                         TALLOC_FREE(tmp_ctx);
 193                         return NT_STATUS_NO_MEMORY;
 194                 }
 195
 196                 gensec_settings->backends = talloc_zero_array(gensec_settings, struct gensec_security_ops *, 2);
 197                 if (gensec_settings->backends == NULL) {
 198                         TALLOC_FREE(tmp_ctx);
 199                         return NT_STATUS_NO_MEMORY;
 200                 }
 201
 202                 gensec_settings->backends[0] = &gensec_ntlmssp3_server_ops;
 203
 204                 nt_status = gensec_server_start(tmp_ctx, gensec_settings,
 205                                                 auth4_context, &gensec_security);
 206
 207                 if (!NT_STATUS_IS_OK(nt_status)) {
 208                         TALLOC_FREE(tmp_ctx);
 209                         return nt_status;
 210                 }
 211                 talloc_unlink(tmp_ctx, lp_ctx);
 212                 talloc_unlink(tmp_ctx, gensec_settings);
 213                 talloc_unlink(tmp_ctx, auth4_context);
 214         }
 215
 216         nt_status = gensec_set_remote_address(gensec_security,
 217                                               remote_address);
 218         if (!NT_STATUS_IS_OK(nt_status)) {
 219                 TALLOC_FREE(tmp_ctx);
 220                 return nt_status;
 221         }
 222
 223         *gensec_security_out = talloc_steal(mem_ctx, gensec_security);
 224         TALLOC_FREE(tmp_ctx);
 225         return NT_STATUS_OK;
 226 }