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                              const char *local_service,
 105                              struct PAC_LOGON_INFO **_logon_info)
 106 {
 107         krb5_error_code ret;
 108         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 109         DATA_BLOB tkt, tkt_wrapped, ap_rep, sesskey1;
 110         const char *auth_princ = 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         ret = kerberos_kinit_password_ext(auth_princ,
 145                                           pass,
 146                                           time_offset,
 147                                           expire_time,
 148                                           renew_till_time,
 149                                           cc,
 150                                           request_pac,
 151                                           add_netbios_addr,
 152                                           renewable_time,
 153                                           &status);
 154         if (ret) {
 155                 DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
 156                         auth_princ, error_message(ret), ret));
 157                 /* status already set */
 158                 goto out;
 159         }
 160
 161         DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
 162         if (expire_time) {
 163                 DEBUGADD(10,("\tvalid until: %s (%d)\n",
 164                         http_timestring(talloc_tos(), *expire_time),
 165                         (int)*expire_time));
 166         }
 167         if (renew_till_time) {
 168                 DEBUGADD(10,("\trenewable till: %s (%d)\n",
 169                         http_timestring(talloc_tos(), *renew_till_time),
 170                         (int)*renew_till_time));
 171         }
 172
 173         /* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
 174          * in that case fallback to NTLM - gd */
 175
 176         if (expire_time && renew_till_time &&
 177             (*expire_time == 0) && (*renew_till_time == 0)) {
 178                 return NT_STATUS_INVALID_LOGON_TYPE;
 179         }
 180
 181         ret = cli_krb5_get_ticket(mem_ctx,
 182                                   local_service,
 183                                   time_offset,
 184                                   &tkt,
 185                                   &sesskey1,
 186                                   0,
 187                                   cc,
 188                                   NULL,
 189                                   impersonate_princ_s);
 190         if (ret) {
 191                 DEBUG(1,("failed to get ticket for %s: %s\n",
 192                         local_service, error_message(ret)));
 193                 if (impersonate_princ_s) {
 194                         DEBUGADD(1,("tried S4U2SELF impersonation as: %s\n",
 195                                 impersonate_princ_s));
 196                 }
 197                 status = krb5_to_nt_status(ret);
 198                 goto out;
 199         }
 200
 201         /* wrap that up in a nice GSS-API wrapping */
 202         tkt_wrapped = spnego_gen_krb5_wrap(tmp_ctx, tkt, TOK_ID_KRB_AP_REQ);
 203         if (tkt_wrapped.data == NULL) {
 204                 status = NT_STATUS_NO_MEMORY;
 205                 goto out;
 206         }
 207
 208         auth_context = talloc_zero(tmp_ctx, struct auth4_context);
 209         if (auth_context == NULL) {
 210                 status = NT_STATUS_NO_MEMORY;
 211                 goto out;
 212         }
 213         auth_context->generate_session_info_pac = kerberos_fetch_pac;
 214
 215         lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
 216         if (lp_ctx == NULL) {
 217                 status = NT_STATUS_INVALID_SERVER_STATE;
 218                 DEBUG(10, ("loadparm_init_s3 failed\n"));
 219                 goto out;
 220         }
 221
 222         gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
 223         if (lp_ctx == NULL) {
 224                 status = NT_STATUS_NO_MEMORY;
 225                 DEBUG(10, ("lpcfg_gensec_settings failed\n"));
 226                 goto out;
 227         }
 228
 229         backends = talloc_zero_array(gensec_settings,
 230                                      const struct gensec_security_ops *, 2);
 231         if (backends == NULL) {
 232                 status = NT_STATUS_NO_MEMORY;
 233                 goto out;
 234         }
 235         gensec_settings->backends = backends;
 236
 237         gensec_init();
 238
 239         backends[idx++] = &gensec_gse_krb5_security_ops;
 240
 241         status = gensec_server_start(tmp_ctx, gensec_settings,
 242                                         auth_context, &gensec_server_context);
 243
 244         if (!NT_STATUS_IS_OK(status)) {
 245                 DEBUG(1, (__location__ "Failed to start server-side GENSEC to validate a Kerberos ticket: %s\n", nt_errstr(status)));
 246                 goto out;
 247         }
 248
 249         talloc_unlink(tmp_ctx, lp_ctx);
 250         talloc_unlink(tmp_ctx, gensec_settings);
 251         talloc_unlink(tmp_ctx, auth_context);
 252
 253         status = gensec_start_mech_by_oid(gensec_server_context, GENSEC_OID_KERBEROS5);
 254         if (!NT_STATUS_IS_OK(status)) {
 255                 DEBUG(1, (__location__ "Failed to start server-side GENSEC krb5 to validate a Kerberos ticket: %s\n", nt_errstr(status)));
 256                 goto out;
 257         }
 258
 259         /* Do a client-server update dance */
 260         status = gensec_update(gensec_server_context, tmp_ctx, NULL, tkt_wrapped, &ap_rep);
 261         if (!NT_STATUS_IS_OK(status)) {
 262                 DEBUG(1, ("gensec_update() failed: %s\n", nt_errstr(status)));
 263                 goto out;
 264         }
 265
 266         /* Now return the PAC information to the callers.  We ingore
 267          * the session_info and instead pick out the PAC via the
 268          * private_data on the auth_context */
 269         status = gensec_session_info(gensec_server_context, tmp_ctx, &session_info);
 270         if (!NT_STATUS_IS_OK(status)) {
 271                 DEBUG(1, ("Unable to obtain PAC via gensec_session_info\n"));
 272                 goto out;
 273         }
 274
 275         logon_info = talloc_get_type_abort(gensec_server_context->auth_context->private_data,
 276                                            struct PAC_LOGON_INFO);
 277         if (logon_info == NULL) {
 278                 DEBUG(1,("no PAC\n"));
 279                 status = NT_STATUS_INVALID_PARAMETER;
 280                 goto out;
 281         }
 282
 283         *_logon_info = talloc_move(mem_ctx, &logon_info);
 284
 285 out:
 286         talloc_free(tmp_ctx);
 287         if (cc != cache_name) {
 288                 ads_kdestroy(cc);
 289         }
 290
 291         data_blob_free(&tkt);
 292         data_blob_free(&ap_rep);
 293         data_blob_free(&sesskey1);
 294
 295         return status;
 296 }
 297
 298 #endif