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