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 "auth/gensec/gensec.h"
  33 #include "auth/gensec/gensec_internal.h" /* TODO: remove this */
  34 #include "../libcli/auth/spnego.h"
  35
  36 #ifdef HAVE_KRB5
  37
  38 #include "auth/kerberos/pac_utils.h"
  39
  40 struct smb_krb5_context;
  41
  42 /****************************************************************
  43 Callback to get the PAC_LOGON_INFO from the blob
  44 ****************************************************************/
  45 static NTSTATUS kerberos_fetch_pac(struct auth4_context *auth_ctx,
  46                                    TALLOC_CTX *mem_ctx,
  47                                    struct smb_krb5_context *smb_krb5_context,
  48                                    DATA_BLOB *pac_blob,
  49                                    const char *princ_name,
  50                                    const struct tsocket_address *remote_address,
  51                                    uint32_t session_info_flags,
  52                                    struct auth_session_info **session_info)
  53 {
  54         TALLOC_CTX *tmp_ctx;
  55         struct PAC_LOGON_INFO *logon_info = NULL;
  56         NTSTATUS status = NT_STATUS_INTERNAL_ERROR;
  57
  58         tmp_ctx = talloc_new(mem_ctx);
  59         if (!tmp_ctx) {
  60                 return NT_STATUS_NO_MEMORY;
  61         }
  62
  63         if (pac_blob) {
  64                 status = kerberos_pac_logon_info(tmp_ctx, *pac_blob, NULL, NULL,
  65                                                  NULL, NULL, 0, &logon_info);
  66                 if (!NT_STATUS_IS_OK(status)) {
  67                         goto done;
  68                 }
  69         }
  70
  71         talloc_set_name_const(logon_info, "struct PAC_LOGON_INFO");
  72
  73         auth_ctx->private_data = talloc_steal(auth_ctx, logon_info);
  74         *session_info = talloc_zero(mem_ctx, struct auth_session_info);
  75         if (!*session_info) {
  76                 status = NT_STATUS_NO_MEMORY;
  77                 goto done;
  78         }
  79         status = NT_STATUS_OK;
  80
  81 done:
  82         TALLOC_FREE(tmp_ctx);
  83
  84         return status;
  85 }
  86
  87 /*
  88  * Given the username/password, do a kinit, store the ticket in
  89  * cache_name if specified, and return the PAC_LOGON_INFO (the
  90  * structure containing the important user information such as
  91  * groups).
  92  */
  93 NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
  94                              const char *name,
  95                              const char *pass,
  96                              time_t time_offset,
  97                              time_t *expire_time,
  98                              time_t *renew_till_time,
  99                              const char *cache_name,
 100                              bool request_pac,
 101                              bool add_netbios_addr,
 102                              time_t renewable_time,
 103                              const char *impersonate_princ_s,
 104                              struct PAC_LOGON_INFO **_logon_info)
 105 {
 106         krb5_error_code ret;
 107         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 108         DATA_BLOB tkt, tkt_wrapped, ap_rep, sesskey1;
 109         const char *auth_princ = NULL;
 110         const char *local_service = NULL;
 111         const char *cc = "MEMORY:kerberos_return_pac";
 112         struct auth_session_info *session_info;
 113         struct gensec_security *gensec_server_context;
 114         const struct gensec_security_ops **backends;
 115         struct gensec_settings *gensec_settings;
 116         size_t idx = 0;
 117         struct auth4_context *auth_context;
 118         struct loadparm_context *lp_ctx;
 119         struct PAC_LOGON_INFO *logon_info = NULL;
 120
 121         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 122         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 123
 124         ZERO_STRUCT(tkt);
 125         ZERO_STRUCT(ap_rep);
 126         ZERO_STRUCT(sesskey1);
 127
 128         if (!name || !pass) {
 129                 return NT_STATUS_INVALID_PARAMETER;
 130         }
 131
 132         if (cache_name) {
 133                 cc = cache_name;
 134         }
 135
 136         if (!strchr_m(name, '@')) {
 137                 auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
 138                         lp_realm());
 139         } else {
 140                 auth_princ = name;
 141         }
 142         NT_STATUS_HAVE_NO_MEMORY(auth_princ);
 143
 144         local_service = talloc_asprintf(mem_ctx, "%s$@%s",
 145                                         lp_netbios_name(), lp_realm());
 146         NT_STATUS_HAVE_NO_MEMORY(local_service);
 147
 148         ret = kerberos_kinit_password_ext(auth_princ,
 149                                           pass,
 150                                           time_offset,
 151                                           expire_time,
 152                                           renew_till_time,
 153                                           cc,
 154                                           request_pac,
 155                                           add_netbios_addr,
 156                                           renewable_time,
 157                                           &status);
 158         if (ret) {
 159                 DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
 160                         auth_princ, error_message(ret), ret));
 161                 /* status already set */
 162                 goto out;
 163         }
 164
 165         DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
 166         if (expire_time) {
 167                 DEBUGADD(10,("\tvalid until: %s (%d)\n",
 168                         http_timestring(talloc_tos(), *expire_time),
 169                         (int)*expire_time));
 170         }
 171         if (renew_till_time) {
 172                 DEBUGADD(10,("\trenewable till: %s (%d)\n",
 173                         http_timestring(talloc_tos(), *renew_till_time),
 174                         (int)*renew_till_time));
 175         }
 176
 177         /* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
 178          * in that case fallback to NTLM - gd */
 179
 180         if (expire_time && renew_till_time &&
 181             (*expire_time == 0) && (*renew_till_time == 0)) {
 182                 return NT_STATUS_INVALID_LOGON_TYPE;
 183         }
 184
 185         ret = cli_krb5_get_ticket(mem_ctx,
 186                                   local_service,
 187                                   time_offset,
 188                                   &tkt,
 189                                   &sesskey1,
 190                                   0,
 191                                   cc,
 192                                   NULL,
 193                                   impersonate_princ_s);
 194         if (ret) {
 195                 DEBUG(1,("failed to get ticket for %s: %s\n",
 196                         local_service, error_message(ret)));
 197                 if (impersonate_princ_s) {
 198                         DEBUGADD(1,("tried S4U2SELF impersonation as: %s\n",
 199                                 impersonate_princ_s));
 200                 }
 201                 status = krb5_to_nt_status(ret);
 202                 goto out;
 203         }
 204
 205         /* wrap that up in a nice GSS-API wrapping */
 206         tkt_wrapped = spnego_gen_krb5_wrap(tmp_ctx, tkt, TOK_ID_KRB_AP_REQ);
 207         if (tkt_wrapped.data == NULL) {
 208                 status = NT_STATUS_NO_MEMORY;
 209                 goto out;
 210         }
 211
 212         auth_context = talloc_zero(tmp_ctx, struct auth4_context);
 213         if (auth_context == NULL) {
 214                 status = NT_STATUS_NO_MEMORY;
 215                 goto out;
 216         }
 217         auth_context->generate_session_info_pac = kerberos_fetch_pac;
 218
 219         lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
 220         if (lp_ctx == NULL) {
 221                 status = NT_STATUS_INVALID_SERVER_STATE;
 222                 DEBUG(10, ("loadparm_init_s3 failed\n"));
 223                 goto out;
 224         }
 225
 226         gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
 227         if (lp_ctx == NULL) {
 228                 status = NT_STATUS_NO_MEMORY;
 229                 DEBUG(10, ("lpcfg_gensec_settings failed\n"));
 230                 goto out;
 231         }
 232
 233         backends = talloc_zero_array(gensec_settings,
 234                                      const struct gensec_security_ops *, 2);
 235         if (backends == NULL) {
 236                 status = NT_STATUS_NO_MEMORY;
 237                 goto out;
 238         }
 239         gensec_settings->backends = backends;
 240
 241         gensec_init();
 242
 243         backends[idx++] = &gensec_gse_krb5_security_ops;
 244
 245         status = gensec_server_start(tmp_ctx, gensec_settings,
 246                                         auth_context, &gensec_server_context);
 247
 248         if (!NT_STATUS_IS_OK(status)) {
 249                 DEBUG(1, (__location__ "Failed to start server-side GENSEC to validate a Kerberos ticket: %s\n", nt_errstr(status)));
 250                 goto out;
 251         }
 252
 253         talloc_unlink(tmp_ctx, lp_ctx);
 254         talloc_unlink(tmp_ctx, gensec_settings);
 255         talloc_unlink(tmp_ctx, auth_context);
 256
 257         status = gensec_start_mech_by_oid(gensec_server_context, GENSEC_OID_KERBEROS5);
 258         if (!NT_STATUS_IS_OK(status)) {
 259                 DEBUG(1, (__location__ "Failed to start server-side GENSEC krb5 to validate a Kerberos ticket: %s\n", nt_errstr(status)));
 260                 goto out;
 261         }
 262
 263         /* Do a client-server update dance */
 264         status = gensec_update(gensec_server_context, tmp_ctx, NULL, tkt_wrapped, &ap_rep);
 265         if (!NT_STATUS_IS_OK(status)) {
 266                 DEBUG(1, ("gensec_update() failed: %s\n", nt_errstr(status)));
 267                 goto out;
 268         }
 269
 270         /* Now return the PAC information to the callers.  We ingore
 271          * the session_info and instead pick out the PAC via the
 272          * private_data on the auth_context */
 273         status = gensec_session_info(gensec_server_context, tmp_ctx, &session_info);
 274         if (!NT_STATUS_IS_OK(status)) {
 275                 DEBUG(1, ("Unable to obtain PAC via gensec_session_info\n"));
 276                 goto out;
 277         }
 278
 279         logon_info = talloc_get_type_abort(gensec_server_context->auth_context->private_data,
 280                                            struct PAC_LOGON_INFO);
 281         if (logon_info == NULL) {
 282                 DEBUG(1,("no PAC\n"));
 283                 status = NT_STATUS_INVALID_PARAMETER;
 284                 goto out;
 285         }
 286
 287         *_logon_info = talloc_move(mem_ctx, &logon_info);
 288
 289 out:
 290         talloc_free(tmp_ctx);
 291         if (cc != cache_name) {
 292                 ads_kdestroy(cc);
 293         }
 294
 295         data_blob_free(&tkt);
 296         data_blob_free(&ap_rep);
 297         data_blob_free(&sesskey1);
 298
 299         return status;
 300 }
 301
 302 #endif