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  * Given the username/password, do a kinit, store the ticket in
  44  * cache_name if specified, and return the PAC_LOGON_INFO (the
  45  * structure containing the important user information such as
  46  * groups).
  47  */
  48 NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
  49                              const char *name,
  50                              const char *pass,
  51                              time_t time_offset,
  52                              time_t *expire_time,
  53                              time_t *renew_till_time,
  54                              const char *cache_name,
  55                              bool request_pac,
  56                              bool add_netbios_addr,
  57                              time_t renewable_time,
  58                              const char *impersonate_princ_s,
  59                              const char *local_service,
  60                              char **_canon_principal,
  61                              char **_canon_realm,
  62                              struct PAC_DATA_CTR **_pac_data_ctr)
  63 {
  64         krb5_error_code ret;
  65         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
  66         DATA_BLOB tkt = data_blob_null;
  67         DATA_BLOB tkt_wrapped = data_blob_null;
  68         DATA_BLOB ap_rep = data_blob_null;
  69         DATA_BLOB sesskey1 = data_blob_null;
  70         const char *auth_princ = NULL;
  71         const char *cc = "MEMORY:kerberos_return_pac";
  72         struct auth_session_info *session_info;
  73         struct gensec_security *gensec_server_context;
  74         const struct gensec_security_ops **backends;
  75         struct gensec_settings *gensec_settings;
  76         size_t idx = 0;
  77         struct auth4_context *auth_context;
  78         struct loadparm_context *lp_ctx;
  79         struct PAC_DATA_CTR *pac_data_ctr = NULL;
  80         char *canon_principal = NULL;
  81         char *canon_realm = NULL;
  82
  83         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
  84         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
  85
  86         ZERO_STRUCT(tkt);
  87         ZERO_STRUCT(ap_rep);
  88         ZERO_STRUCT(sesskey1);
  89
  90         if (!name || !pass) {
  91                 status = NT_STATUS_INVALID_PARAMETER;
  92                 goto out;
  93         }
  94
  95         if (_canon_principal != NULL) {
  96                 *_canon_principal = NULL;
  97         }
  98
  99         if (_canon_realm != NULL) {
 100                 *_canon_realm = NULL;
 101         }
 102
 103         if (cache_name) {
 104                 cc = cache_name;
 105         }
 106
 107         if (!strchr_m(name, '@')) {
 108                 auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
 109                         lp_realm());
 110         } else {
 111                 auth_princ = name;
 112         }
 113         NT_STATUS_HAVE_NO_MEMORY(auth_princ);
 114
 115         ret = kerberos_kinit_password_ext(auth_princ,
 116                                           pass,
 117                                           time_offset,
 118                                           expire_time,
 119                                           renew_till_time,
 120                                           cc,
 121                                           request_pac,
 122                                           add_netbios_addr,
 123                                           renewable_time,
 124                                           tmp_ctx,
 125                                           &canon_principal,
 126                                           &canon_realm,
 127                                           &status);
 128         if (ret) {
 129                 DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
 130                         auth_princ, error_message(ret), ret));
 131                 /* status already set */
 132                 goto out;
 133         }
 134
 135         DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
 136         if (expire_time) {
 137                 DEBUGADD(10,("\tvalid until: %s (%d)\n",
 138                         http_timestring(talloc_tos(), *expire_time),
 139                         (int)*expire_time));
 140         }
 141         if (renew_till_time) {
 142                 DEBUGADD(10,("\trenewable till: %s (%d)\n",
 143                         http_timestring(talloc_tos(), *renew_till_time),
 144                         (int)*renew_till_time));
 145         }
 146
 147         /* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
 148          * in that case fallback to NTLM - gd */
 149
 150         if (expire_time && renew_till_time &&
 151             (*expire_time == 0) && (*renew_till_time == 0)) {
 152                 status = NT_STATUS_INVALID_LOGON_TYPE;
 153                 goto out;
 154         }
 155
 156         ret = ads_krb5_cli_get_ticket(mem_ctx,
 157                                       local_service,
 158                                       time_offset,
 159                                       &tkt,
 160                                       &sesskey1,
 161                                       0,
 162                                       cc,
 163                                       NULL,
 164                                       impersonate_princ_s);
 165         if (ret) {
 166                 DEBUG(1,("failed to get ticket for %s: %s\n",
 167                         local_service, error_message(ret)));
 168                 if (impersonate_princ_s) {
 169                         DEBUGADD(1,("tried S4U2SELF impersonation as: %s\n",
 170                                 impersonate_princ_s));
 171                 }
 172                 status = krb5_to_nt_status(ret);
 173                 goto out;
 174         }
 175
 176         /* wrap that up in a nice GSS-API wrapping */
 177         tkt_wrapped = spnego_gen_krb5_wrap(tmp_ctx, tkt, TOK_ID_KRB_AP_REQ);
 178         if (tkt_wrapped.data == NULL) {
 179                 status = NT_STATUS_NO_MEMORY;
 180                 goto out;
 181         }
 182
 183         auth_context = auth4_context_for_PAC_DATA_CTR(tmp_ctx);
 184         if (auth_context == NULL) {
 185                 status = NT_STATUS_NO_MEMORY;
 186                 goto out;
 187         }
 188
 189         lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
 190         if (lp_ctx == NULL) {
 191                 status = NT_STATUS_INVALID_SERVER_STATE;
 192                 DEBUG(10, ("loadparm_init_s3 failed\n"));
 193                 goto out;
 194         }
 195
 196         gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
 197         if (gensec_settings == NULL) {
 198                 status = NT_STATUS_NO_MEMORY;
 199                 DEBUG(10, ("lpcfg_gensec_settings failed\n"));
 200                 goto out;
 201         }
 202
 203         backends = talloc_zero_array(gensec_settings,
 204                                      const struct gensec_security_ops *, 2);
 205         if (backends == NULL) {
 206                 status = NT_STATUS_NO_MEMORY;
 207                 goto out;
 208         }
 209         gensec_settings->backends = backends;
 210
 211         gensec_init();
 212
 213         backends[idx++] = &gensec_gse_krb5_security_ops;
 214
 215         status = gensec_server_start(tmp_ctx, gensec_settings,
 216                                         auth_context, &gensec_server_context);
 217
 218         if (!NT_STATUS_IS_OK(status)) {
 219                 DEBUG(1, (__location__ "Failed to start server-side GENSEC to validate a Kerberos ticket: %s\n", nt_errstr(status)));
 220                 goto out;
 221         }
 222
 223         talloc_unlink(tmp_ctx, lp_ctx);
 224         talloc_unlink(tmp_ctx, gensec_settings);
 225         talloc_unlink(tmp_ctx, auth_context);
 226
 227         /* Session info is not complete, do not pass to auth log */
 228         gensec_want_feature(gensec_server_context, GENSEC_FEATURE_NO_AUTHZ_LOG);
 229
 230         status = gensec_start_mech_by_oid(gensec_server_context, GENSEC_OID_KERBEROS5);
 231         if (!NT_STATUS_IS_OK(status)) {
 232                 DEBUG(1, (__location__ "Failed to start server-side GENSEC krb5 to validate a Kerberos ticket: %s\n", nt_errstr(status)));
 233                 goto out;
 234         }
 235
 236         /* Do a client-server update dance */
 237         status = gensec_update(gensec_server_context, tmp_ctx, tkt_wrapped, &ap_rep);
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 DEBUG(1, ("gensec_update() failed: %s\n", nt_errstr(status)));
 240                 goto out;
 241         }
 242
 243         /* Now return the PAC information to the callers.  We ingore
 244          * the session_info and instead pick out the PAC via the
 245          * private_data on the auth_context */
 246         status = gensec_session_info(gensec_server_context, tmp_ctx, &session_info);
 247         if (!NT_STATUS_IS_OK(status)) {
 248                 DEBUG(1, ("Unable to obtain PAC via gensec_session_info\n"));
 249                 goto out;
 250         }
 251
 252         pac_data_ctr = auth4_context_get_PAC_DATA_CTR(auth_context, mem_ctx);
 253         if (pac_data_ctr == NULL) {
 254                 DEBUG(1,("no PAC\n"));
 255                 status = NT_STATUS_INVALID_PARAMETER;
 256                 goto out;
 257         }
 258
 259         *_pac_data_ctr = talloc_move(mem_ctx, &pac_data_ctr);
 260         if (_canon_principal != NULL) {
 261                 *_canon_principal = talloc_move(mem_ctx, &canon_principal);
 262         }
 263         if (_canon_realm != NULL) {
 264                 *_canon_realm = talloc_move(mem_ctx, &canon_realm);
 265         }
 266
 267 out:
 268         talloc_free(tmp_ctx);
 269         if (cc != cache_name) {
 270                 ads_kdestroy(cc);
 271         }
 272
 273         data_blob_free(&tkt);
 274         data_blob_free(&ap_rep);
 275         data_blob_free(&sesskey1);
 276
 277         return status;
 278 }
 279
 280 #endif