source3/libads/authdata.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    kerberos authorization data (PAC) utility library
   4    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   6    Copyright (C) Andrew Tridgell 2001
   7    Copyright (C) Luke Howard 2002-2003
   8    Copyright (C) Stefan Metzmacher 2004-2005
   9    Copyright (C) Guenther Deschner 2005,2007,2008
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "librpc/gen_ndr/ndr_krb5pac.h"
  27 #include "smb_krb5.h"
  28 #include "libads/kerberos_proto.h"
  29 #include "auth/common_auth.h"
  30 #include "lib/param/param.h"
  31 #include "librpc/crypto/gse.h"
  32 #include "librpc/crypto/gse_krb5.h"
  33 #include "auth/credentials/credentials.h"
  34 #include "../source4/auth/kerberos/krb5_init_context.h"
  35 #include "auth/gensec/gensec.h"
  36 #include "auth/gensec/gensec_internal.h" /* TODO: remove this */
  37 #include "../libcli/auth/spnego.h"
  38
  39 #ifdef HAVE_KRB5
  40
  41 #include "auth/kerberos/pac_utils.h"
  42
  43 struct smb_krb5_context;
  44
  45 /*
  46  * Given the username/password, do a kinit, store the ticket in
  47  * cache_name if specified, and return the PAC_LOGON_INFO (the
  48  * structure containing the important user information such as
  49  * groups).
  50  */
  51 NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
  52                              const char *name,
  53                              const char *pass,
  54                              time_t time_offset,
  55                              time_t *expire_time,
  56                              time_t *renew_till_time,
  57                              const char *cache_name,
  58                              bool request_pac,
  59                              bool add_netbios_addr,
  60                              time_t renewable_time,
  61                              const char *impersonate_princ_s,
  62                              const char *local_service,
  63                              struct PAC_DATA_CTR **_pac_data_ctr)
  64 {
  65         krb5_error_code ret;
  66         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
  67         DATA_BLOB tkt, tkt_wrapped, ap_rep, sesskey1;
  68         const char *auth_princ = NULL;
  69         const char *cc = "MEMORY:kerberos_return_pac";
  70         struct auth_session_info *session_info;
  71         struct gensec_security *gensec_server_context;
  72         const struct gensec_security_ops **backends;
  73         struct gensec_settings *gensec_settings;
  74         size_t idx = 0;
  75         struct auth4_context *auth_context;
  76         struct loadparm_context *lp_ctx;
  77         struct cli_credentials *server_credentials = NULL;
  78         struct PAC_DATA_CTR *pac_data_ctr = NULL;
  79
  80         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
  81         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
  82
  83         ZERO_STRUCT(tkt);
  84         ZERO_STRUCT(ap_rep);
  85         ZERO_STRUCT(sesskey1);
  86
  87         if (!name || !pass) {
  88                 return NT_STATUS_INVALID_PARAMETER;
  89         }
  90
  91         if (cache_name) {
  92                 cc = cache_name;
  93         }
  94
  95         if (!strchr_m(name, '@')) {
  96                 auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
  97                         lp_realm());
  98         } else {
  99                 auth_princ = name;
 100         }
 101         NT_STATUS_HAVE_NO_MEMORY(auth_princ);
 102
 103         ret = kerberos_kinit_password_ext(auth_princ,
 104                                           pass,
 105                                           time_offset,
 106                                           expire_time,
 107                                           renew_till_time,
 108                                           cc,
 109                                           request_pac,
 110                                           add_netbios_addr,
 111                                           renewable_time,
 112                                           NULL, NULL, NULL,
 113                                           &status);
 114         if (ret) {
 115                 DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
 116                         auth_princ, error_message(ret), ret));
 117                 /* status already set */
 118                 goto out;
 119         }
 120
 121         DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
 122         if (expire_time) {
 123                 DEBUGADD(10,("\tvalid until: %s (%d)\n",
 124                         http_timestring(talloc_tos(), *expire_time),
 125                         (int)*expire_time));
 126         }
 127         if (renew_till_time) {
 128                 DEBUGADD(10,("\trenewable till: %s (%d)\n",
 129                         http_timestring(talloc_tos(), *renew_till_time),
 130                         (int)*renew_till_time));
 131         }
 132
 133         /* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
 134          * in that case fallback to NTLM - gd */
 135
 136         if (expire_time && renew_till_time &&
 137             (*expire_time == 0) && (*renew_till_time == 0)) {
 138                 return NT_STATUS_INVALID_LOGON_TYPE;
 139         }
 140
 141         ret = ads_krb5_cli_get_ticket(mem_ctx,
 142                                       local_service,
 143                                       time_offset,
 144                                       &tkt,
 145                                       &sesskey1,
 146                                       0,
 147                                       cc,
 148                                       NULL,
 149                                       impersonate_princ_s);
 150         if (ret) {
 151                 DEBUG(1,("failed to get ticket for %s: %s\n",
 152                         local_service, error_message(ret)));
 153                 if (impersonate_princ_s) {
 154                         DEBUGADD(1,("tried S4U2SELF impersonation as: %s\n",
 155                                 impersonate_princ_s));
 156                 }
 157                 status = krb5_to_nt_status(ret);
 158                 goto out;
 159         }
 160
 161         /* wrap that up in a nice GSS-API wrapping */
 162         tkt_wrapped = spnego_gen_krb5_wrap(tmp_ctx, tkt, TOK_ID_KRB_AP_REQ);
 163         if (tkt_wrapped.data == NULL) {
 164                 status = NT_STATUS_NO_MEMORY;
 165                 goto out;
 166         }
 167
 168         auth_context = auth4_context_for_PAC_DATA_CTR(tmp_ctx);
 169         if (auth_context == NULL) {
 170                 status = NT_STATUS_NO_MEMORY;
 171                 goto out;
 172         }
 173
 174         lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
 175         if (lp_ctx == NULL) {
 176                 status = NT_STATUS_INVALID_SERVER_STATE;
 177                 DEBUG(10, ("loadparm_init_s3 failed\n"));
 178                 goto out;
 179         }
 180
 181         gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
 182         if (gensec_settings == NULL) {
 183                 status = NT_STATUS_NO_MEMORY;
 184                 DEBUG(10, ("lpcfg_gensec_settings failed\n"));
 185                 goto out;
 186         }
 187
 188         backends = talloc_zero_array(gensec_settings,
 189                                      const struct gensec_security_ops *, 2);
 190         if (backends == NULL) {
 191                 status = NT_STATUS_NO_MEMORY;
 192                 goto out;
 193         }
 194         gensec_settings->backends = backends;
 195
 196         gensec_init();
 197
 198         //backends[idx++] = &gensec_gse_krb5_security_ops;
 199         backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_KERBEROS5);
 200
 201         /*
 202          * This is anonymous for now, because we just use it
 203          * to set the kerberos state at the moment
 204          */
 205         server_credentials = cli_credentials_init_anon(tmp_ctx);
 206         if (!server_credentials) {
 207                 DEBUG(0, ("auth_generic_prepare: Failed to init server credentials\n"));
 208                 status = NT_STATUS_NO_MEMORY;
 209                 goto out;
 210         }
 211
 212         cli_credentials_set_conf(server_credentials, lp_ctx);
 213
 214         {
 215                 struct smb_krb5_context *smb_k5ctx = NULL;
 216                 char *keytab_name = NULL;
 217                 krb5_error_code k5ret;
 218                 krb5_keytab k5keytab = NULL;
 219
 220                 keytab_name = talloc_asprintf(server_credentials,
 221                                 "MEMORY:kerberos_return_pac_%u_%p",
 222                                 (unsigned int)getpid(),
 223                                 server_credentials);
 224                 if (keytab_name == NULL) {
 225                         status = NT_STATUS_NO_MEMORY;
 226                         goto out;
 227                 }
 228
 229                 k5ret = cli_credentials_get_krb5_context(server_credentials,
 230                                                          lp_ctx,
 231                                                          &smb_k5ctx);
 232                 status = krb5_to_nt_status(k5ret);
 233                 if (!NT_STATUS_IS_OK(status)) {
 234                         goto out;
 235                 }
 236
 237                 k5ret = gse_krb5_create_server_keytab(smb_k5ctx->krb5_context,
 238                                                       keytab_name,
 239                                                       &k5keytab);
 240                 status = krb5_to_nt_status(k5ret);
 241                 if (!NT_STATUS_IS_OK(status)) {
 242                         goto out;
 243                 }
 244
 245                 k5ret = cli_credentials_set_keytab_name(server_credentials,
 246                                                         lp_ctx,
 247                                                         keytab_name,
 248                                                         CRED_SPECIFIED);
 249                 krb5_kt_close(smb_k5ctx->krb5_context, k5keytab);
 250                 status = krb5_to_nt_status(k5ret);
 251                 if (!NT_STATUS_IS_OK(status)) {
 252                         goto out;
 253                 }
 254
 255                 cli_credentials_set_kerberos_state(server_credentials, CRED_MUST_USE_KERBEROS);
 256         }
 257
 258         status = gensec_server_start(tmp_ctx, gensec_settings,
 259                                         auth_context, &gensec_server_context);
 260
 261         if (!NT_STATUS_IS_OK(status)) {
 262                 DEBUG(1, (__location__ "Failed to start server-side GENSEC to validate a Kerberos ticket: %s\n", nt_errstr(status)));
 263                 goto out;
 264         }
 265
 266         gensec_set_credentials(gensec_server_context, server_credentials);
 267
 268         talloc_unlink(tmp_ctx, lp_ctx);
 269         talloc_unlink(tmp_ctx, server_credentials);
 270         talloc_unlink(tmp_ctx, gensec_settings);
 271         talloc_unlink(tmp_ctx, auth_context);
 272
 273         /* Session info is not complete, do not pass to auth log */
 274         gensec_want_feature(gensec_server_context, GENSEC_FEATURE_NO_AUTHZ_LOG);
 275
 276         status = gensec_start_mech_by_oid(gensec_server_context, GENSEC_OID_KERBEROS5);
 277         if (!NT_STATUS_IS_OK(status)) {
 278                 DEBUG(1, (__location__ "Failed to start server-side GENSEC krb5 to validate a Kerberos ticket: %s\n", nt_errstr(status)));
 279                 goto out;
 280         }
 281
 282         /* Do a client-server update dance */
 283         status = gensec_update(gensec_server_context, tmp_ctx, tkt_wrapped, &ap_rep);
 284         if (!NT_STATUS_IS_OK(status)) {
 285                 DEBUG(1, ("gensec_update() failed: %s\n", nt_errstr(status)));
 286                 goto out;
 287         }
 288
 289         /* Now return the PAC information to the callers.  We ingore
 290          * the session_info and instead pick out the PAC via the
 291          * private_data on the auth_context */
 292         status = gensec_session_info(gensec_server_context, tmp_ctx, &session_info);
 293         if (!NT_STATUS_IS_OK(status)) {
 294                 DEBUG(1, ("Unable to obtain PAC via gensec_session_info\n"));
 295                 goto out;
 296         }
 297
 298         pac_data_ctr = auth4_context_get_PAC_DATA_CTR(auth_context, mem_ctx);
 299         if (pac_data_ctr == NULL) {
 300                 DEBUG(1,("no PAC\n"));
 301                 status = NT_STATUS_INVALID_PARAMETER;
 302                 goto out;
 303         }
 304
 305         *_pac_data_ctr = talloc_move(mem_ctx, &pac_data_ctr);
 306
 307 out:
 308         talloc_free(tmp_ctx);
 309         if (cc != cache_name) {
 310                 ads_kdestroy(cc);
 311         }
 312
 313         data_blob_free(&tkt);
 314         data_blob_free(&ap_rep);
 315         data_blob_free(&sesskey1);
 316
 317         return status;
 318 }
 319
 320 #endif