source4/torture/unix/whoami.c

   1 /*
   2    Test the SMB_WHOAMI Unix extension.
   3
   4    Copyright (C) 2007 James Peach
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "libcli/libcli.h"
  22 #include "libcli/raw/raw_proto.h"
  23 #include "torture/torture.h"
  24 #include "torture/unix/proto.h"
  25 #include "lib/cmdline/cmdline.h"
  26 #include "auth/credentials/credentials.h"
  27 #include "param/param.h"
  28 #include "libcli/resolve/resolve.h"
  29 #include <ldb.h>
  30 #include "lib/util/util_ldb.h"
  31 #include "ldb_wrap.h"
  32 #include "dsdb/samdb/samdb.h"
  33 #include "../libcli/security/security.h"
  34
  35 #undef strcasecmp
  36
  37 /* Size (in bytes) of the required fields in the SMBwhoami response. */
  38 #define WHOAMI_REQUIRED_SIZE    40
  39
  40 /*
  41    SMBWhoami - Query the user mapping performed by the server for the
  42    connected tree. This is a subcommand of the TRANS2_QFSINFO.
  43
  44    Returns:
  45        4 bytes unsigned -      mapping flags (smb_whoami_flags)
  46        4 bytes unsigned -      flags mask
  47
  48        8 bytes unsigned -      primary UID
  49        8 bytes unsigned -      primary GID
  50        4 bytes unsigned -      number of supplementary GIDs
  51        4 bytes unsigned -      number of SIDs
  52        4 bytes unsigned -      SID list byte count
  53        4 bytes -               pad / reserved (must be zero)
  54
  55        8 bytes unsigned[] -    list of GIDs (may be empty)
  56        struct dom_sid[] -             list of SIDs (may be empty)
  57 */
  58
  59 struct smb_whoami
  60 {
  61         uint32_t        mapping_flags;
  62         uint32_t        mapping_mask;
  63         uint64_t        server_uid;
  64         uint64_t        server_gid;
  65         uint32_t        num_gids;
  66         uint32_t        num_sids;
  67         uint32_t        num_sid_bytes;
  68         uint32_t        reserved; /* Must be zero */
  69         uint64_t *      gid_list;
  70         struct dom_sid ** sid_list;
  71 };
  72
  73 static struct smbcli_state *connect_to_server(struct torture_context *tctx,
  74                 struct cli_credentials *creds)
  75 {
  76         NTSTATUS status;
  77         struct smbcli_state *cli;
  78
  79         const char *host = torture_setting_string(tctx, "host", NULL);
  80         const char *share = torture_setting_string(tctx, "share", NULL);
  81         struct smbcli_options options;
  82         struct smbcli_session_options session_options;
  83
  84         lpcfg_smbcli_options(tctx->lp_ctx, &options);
  85         lpcfg_smbcli_session_options(tctx->lp_ctx, &session_options);
  86
  87         status = smbcli_full_connection(tctx, &cli, host,
  88                                         lpcfg_smb_ports(tctx->lp_ctx),
  89                                         share, NULL, lpcfg_socket_options(tctx->lp_ctx),
  90                                         creds, lpcfg_resolve_context(tctx->lp_ctx),
  91                                         tctx->ev, &options, &session_options,
  92                                         lpcfg_gensec_settings(tctx, tctx->lp_ctx));
  93
  94         if (!NT_STATUS_IS_OK(status)) {
  95                 torture_comment(tctx,
  96                                 "FATAL: Failed to connect to //%s/%s "
  97                                 "with %s - %s\n",
  98                                 host,
  99                                 share,
 100                                 cli_credentials_get_username(creds),
 101                                 nt_errstr(status));
 102                 return NULL;
 103         }
 104
 105         return cli;
 106 }
 107
 108 static bool whoami_sid_parse(void *mem_ctx,
 109                 struct torture_context *torture,
 110                 DATA_BLOB *data, size_t *offset,
 111                 struct dom_sid **psid)
 112 {
 113         size_t remain = data->length - *offset;
 114         int i;
 115
 116         *psid = talloc_zero(mem_ctx, struct dom_sid);
 117         torture_assert(torture, *psid != NULL, "out of memory");
 118
 119         torture_assert(torture, remain >= 8,
 120                         "invalid SID format");
 121
 122         (*psid)->sid_rev_num = CVAL(data->data, *offset);
 123         (*psid)->num_auths = CVAL(data->data, *offset + 1);
 124         memcpy((*psid)->id_auth, data->data + *offset + 2, 6);
 125
 126         (*offset) += 8;
 127         remain = data->length - *offset;
 128
 129         torture_assert(torture, remain >= ((*psid)->num_auths * 4),
 130                         "invalid sub_auth byte count");
 131         torture_assert(torture, (*psid)->num_auths >= 0,
 132                         "invalid sub_auth value");
 133         torture_assert(torture, (*psid)->num_auths <= 15,
 134                         "invalid sub_auth value");
 135
 136         for (i = 0; i < (*psid)->num_auths; i++) {
 137                 (*psid)->sub_auths[i] = IVAL(data->data, *offset);
 138                 (*offset) += 4;
 139         }
 140
 141         return true;
 142 }
 143
 144 static bool smb_raw_query_posix_whoami(void *mem_ctx,
 145                                 struct torture_context *torture,
 146                                 struct smbcli_state *cli,
 147                                 struct smb_whoami *whoami,
 148                                 unsigned max_data)
 149 {
 150         struct smb_trans2 tp;
 151         NTSTATUS status;
 152         size_t offset;
 153         int i;
 154
 155         uint16_t setup = TRANSACT2_QFSINFO;
 156         uint16_t info_level;
 157
 158         ZERO_STRUCTP(whoami);
 159
 160         tp.in.max_setup = 0;
 161         tp.in.flags = 0;
 162         tp.in.timeout = 0;
 163         tp.in.setup_count = 1;
 164         tp.in.max_param = 10;
 165         tp.in.max_data = (uint16_t)max_data;
 166         tp.in.setup = &setup;
 167         tp.in.trans_name = NULL;
 168         SSVAL(&info_level, 0, SMB_QFS_POSIX_WHOAMI);
 169         tp.in.params = data_blob_talloc(mem_ctx, &info_level, 2);
 170         tp.in.data = data_blob_talloc(mem_ctx, NULL, 0);
 171
 172         status = smb_raw_trans2(cli->tree, mem_ctx, &tp);
 173         torture_assert_ntstatus_equal(torture, status, NT_STATUS_OK,
 174                         "doing SMB_QFS_POSIX_WHOAMI");
 175
 176         /* Make sure we got back all the required fields. */
 177         torture_assert(torture, tp.out.params.length == 0,
 178                         "trans2 params should be empty");
 179         torture_assert(torture, tp.out.data.length >= WHOAMI_REQUIRED_SIZE,
 180                         "checking for required response fields");
 181
 182         whoami->mapping_flags = IVAL(tp.out.data.data, 0);
 183         whoami->mapping_mask = IVAL(tp.out.data.data, 4);
 184         whoami->server_uid = BVAL(tp.out.data.data, 8);
 185         whoami->server_gid = BVAL(tp.out.data.data, 16);
 186         whoami->num_gids = IVAL(tp.out.data.data, 24);
 187         whoami->num_sids = IVAL(tp.out.data.data, 28);
 188         whoami->num_sid_bytes = IVAL(tp.out.data.data, 32);
 189         whoami->reserved = IVAL(tp.out.data.data, 36);
 190
 191         /* The GID list and SID list are optional, depending on the count
 192          * and length fields.
 193          */
 194         if (whoami->num_sids != 0) {
 195                 torture_assert(torture, whoami->num_sid_bytes != 0,
 196                                 "SID count does not match byte count");
 197         }
 198
 199         printf("\tmapping_flags=0x%08x mapping_mask=0x%08x\n",
 200                         whoami->mapping_flags, whoami->mapping_mask);
 201         printf("\tserver UID=%llu GID=%llu\n",
 202                (unsigned long long)whoami->server_uid, (unsigned long long)whoami->server_gid);
 203         printf("\t%u GIDs, %u SIDs, %u SID bytes\n",
 204                         whoami->num_gids, whoami->num_sids,
 205                         whoami->num_sid_bytes);
 206
 207         offset = WHOAMI_REQUIRED_SIZE;
 208
 209         torture_assert_int_equal(torture, whoami->reserved, 0,
 210                         "invalid reserved field");
 211
 212         if (tp.out.data.length == offset) {
 213                 /* No SIDs or GIDs returned */
 214                 torture_assert_int_equal(torture, whoami->num_gids, 0,
 215                                 "invalid GID count");
 216                 torture_assert_int_equal(torture, whoami->num_sids, 0,
 217                                 "invalid SID count");
 218                 torture_assert_int_equal(torture, whoami->num_sid_bytes, 0,
 219                                 "invalid SID byte count");
 220                 return true;
 221         }
 222
 223         if (whoami->num_gids != 0) {
 224                 int remain = tp.out.data.length - offset;
 225                 int gid_bytes = whoami->num_gids * 8;
 226
 227                 if (whoami->num_sids == 0) {
 228                         torture_assert_int_equal(torture, remain, gid_bytes,
 229                                         "GID count does not match data length");
 230                 } else {
 231                         torture_assert(torture, remain > gid_bytes,
 232                                                 "invalid GID count");
 233                 }
 234
 235                 whoami->gid_list = talloc_array(mem_ctx, uint64_t, whoami->num_gids);
 236                 torture_assert(torture, whoami->gid_list != NULL, "out of memory");
 237
 238                 torture_comment(torture, "\tGIDs:\n");
 239
 240                 for (i = 0; i < whoami->num_gids; ++i) {
 241                         whoami->gid_list[i] = BVAL(tp.out.data.data, offset);
 242                         offset += 8;
 243                         torture_comment(torture, "\t\t%u\n", (unsigned int)whoami->gid_list[i]);
 244                 }
 245         }
 246
 247         /* Check if there should be data left for the SID list. */
 248         if (tp.out.data.length == offset) {
 249                 torture_assert_int_equal(torture, whoami->num_sids, 0,
 250                                 "invalid SID count");
 251                 return true;
 252         }
 253
 254         /* All the remaining bytes must be the SID list. */
 255         torture_assert_int_equal(torture,
 256                 whoami->num_sid_bytes, (tp.out.data.length - offset),
 257                 "invalid SID byte count");
 258
 259         if (whoami->num_sids != 0) {
 260
 261                 whoami->sid_list = talloc_array(mem_ctx, struct dom_sid *,
 262                                 whoami->num_sids);
 263                 torture_assert(torture, whoami->sid_list != NULL,
 264                                 "out of memory");
 265
 266                 torture_comment(torture, "\tSIDs:\n");
 267
 268                 for (i = 0; i < whoami->num_sids; ++i) {
 269                         if (!whoami_sid_parse(mem_ctx, torture,
 270                                         &tp.out.data, &offset,
 271                                         &whoami->sid_list[i])) {
 272                                 return false;
 273                         }
 274
 275                         torture_comment(torture, "\t\t%s\n",
 276                                         dom_sid_string(torture, whoami->sid_list[i]));
 277                 }
 278         }
 279
 280         /* We should be at the end of the response now. */
 281         torture_assert_int_equal(torture, tp.out.data.length, offset,
 282                         "trailing garbage bytes");
 283
 284         return true;
 285 }
 286
 287 static bool test_against_ldap(struct torture_context *torture, struct ldb_context *ldb, bool is_dc,
 288                               struct smb_whoami *whoami)
 289 {
 290         struct ldb_message *msg;
 291         struct ldb_message_element *el;
 292
 293         const char *attrs[] = { "tokenGroups", NULL };
 294         int i;
 295
 296         torture_assert_int_equal(torture, dsdb_search_one(ldb, torture, &msg, NULL, LDB_SCOPE_BASE, attrs, 0, NULL), LDB_SUCCESS, "searching for tokenGroups");
 297         el = ldb_msg_find_element(msg, "tokenGroups");
 298         torture_assert(torture, el, "obtaining tokenGroups");
 299         torture_assert(torture, el->num_values > 0, "Number of SIDs from LDAP needs to be more than 0");
 300         torture_assert(torture, whoami->num_sids > 0, "Number of SIDs from LDAP needs to be more than 0");
 301
 302         if (is_dc) {
 303                 torture_assert_int_equal(torture, el->num_values, whoami->num_sids, "Number of SIDs from LDAP and number of SIDs from CIFS does not match!");
 304
 305                 for (i = 0; i < el->num_values; i++) {
 306                         struct dom_sid *sid = talloc(torture, struct dom_sid);
 307                         ssize_t ret;
 308                         torture_assert(torture, sid != NULL, "talloc failed");
 309
 310                         ret = sid_parse(el->values[i].data,
 311                                         el->values[i].length, sid);
 312                         torture_assert(torture,
 313                                        ret != -1,
 314                                        "sid parse failed");
 315                         torture_assert_str_equal(torture, dom_sid_string(sid, sid), dom_sid_string(sid, whoami->sid_list[i]), "SID from LDAP and SID from CIFS does not match!");
 316                         talloc_free(sid);
 317                 }
 318         } else {
 319                 unsigned int num_domain_sids_dc = 0, num_domain_sids_member = 0;
 320                 struct dom_sid *user_sid = talloc(torture, struct dom_sid);
 321                 struct dom_sid *dom_sid = talloc(torture, struct dom_sid);
 322                 struct dom_sid *dc_sids = talloc_array(torture, struct dom_sid, el->num_values);
 323                 struct dom_sid *member_sids = talloc_array(torture, struct dom_sid, whoami->num_sids);
 324                 ssize_t ret;
 325                 torture_assert(torture, user_sid != NULL, "talloc failed");
 326                 ret = sid_parse(el->values[0].data,
 327                                 el->values[0].length,
 328                                 user_sid);
 329                 torture_assert(torture,
 330                                ret != -1,
 331                                "sid parse failed");
 332                 torture_assert_ntstatus_equal(torture, dom_sid_split_rid(torture, user_sid, &dom_sid, NULL), NT_STATUS_OK, "failed to split domain SID from user SID");
 333                 for (i = 0; i < el->num_values; i++) {
 334                         struct dom_sid *sid = talloc(dc_sids, struct dom_sid);
 335                         torture_assert(torture, sid != NULL, "talloc failed");
 336
 337                         ret = sid_parse(el->values[i].data,
 338                                         el->values[i].length,
 339                                         sid);
 340                         torture_assert(torture,
 341                                        ret != -1,
 342                                        "sid parse failed");
 343                         if (dom_sid_in_domain(dom_sid, sid)) {
 344                                 dc_sids[num_domain_sids_dc] = *sid;
 345                                 num_domain_sids_dc++;
 346                         }
 347                         talloc_free(sid);
 348                 }
 349
 350                 for (i = 0; i < whoami->num_sids; i++) {
 351                         if (dom_sid_in_domain(dom_sid, whoami->sid_list[i])) {
 352                                 member_sids[num_domain_sids_member] = *whoami->sid_list[i];
 353                                 num_domain_sids_member++;
 354                         }
 355                 }
 356
 357                 torture_assert_int_equal(torture, num_domain_sids_dc, num_domain_sids_member, "Number of Domain SIDs from LDAP DC and number of SIDs from CIFS member does not match!");
 358                 for (i = 0; i < num_domain_sids_dc; i++) {
 359                         torture_assert_str_equal(torture, dom_sid_string(dc_sids, &dc_sids[i]), dom_sid_string(member_sids, &member_sids[i]), "Domain SID from LDAP DC and SID from CIFS member server does not match!");
 360                 }
 361                 talloc_free(dc_sids);
 362                 talloc_free(member_sids);
 363         }
 364         return true;
 365 }
 366
 367 bool torture_unix_whoami(struct torture_context *torture)
 368 {
 369         struct smbcli_state *cli;
 370         struct smb_whoami whoami;
 371         bool ret = false;
 372         struct ldb_context *ldb;
 373         const char *addc, *host;
 374
 375         cli = connect_to_server(torture, samba_cmdline_get_creds());
 376         torture_assert(torture, cli, "connecting to server with authenticated credentials");
 377
 378         /* Test basic authenticated mapping. */
 379         torture_assert_goto(torture, smb_raw_query_posix_whoami(torture, torture,
 380                                                        cli, &whoami, 0xFFFF), ret, fail,
 381                             "calling SMB_QFS_POSIX_WHOAMI on an authenticated connection");
 382
 383         /* Check that our anonymous login mapped us to guest on the server, but
 384          * only if the server supports this.
 385          */
 386         if (whoami.mapping_mask & SMB_WHOAMI_GUEST) {
 387                 bool guest = whoami.mapping_flags & SMB_WHOAMI_GUEST;
 388                 torture_comment(torture, "checking whether we were logged in as guest... %s\n",
 389                         guest ? "YES" : "NO");
 390                 torture_assert(torture,
 391                         cli_credentials_is_anonymous(
 392                                 samba_cmdline_get_creds()) == guest,
 393                                "login did not credentials map to guest");
 394         } else {
 395                 torture_comment(torture, "server does not support SMB_WHOAMI_GUEST flag\n");
 396         }
 397
 398         addc = torture_setting_string(torture, "addc", NULL);
 399         host = torture_setting_string(torture, "host", NULL);
 400
 401         if (addc) {
 402                 ldb = ldb_wrap_connect(torture, torture->ev, torture->lp_ctx, talloc_asprintf(torture, "ldap://%s", addc),
 403                                        NULL, samba_cmdline_get_creds(), 0);
 404                 torture_assert(torture, ldb, "ldb connect failed");
 405
 406                 /* We skip this testing if we could not contact the LDAP server */
 407                 if (!test_against_ldap(torture, ldb, strcasecmp(addc, host) == 0, &whoami)) {
 408                         goto fail;
 409                 }
 410         }
 411
 412         /* Test that the server drops the UID and GID list. */
 413         torture_assert_goto(torture, smb_raw_query_posix_whoami(torture, torture,
 414                                                   cli, &whoami, 0x40), ret, fail,
 415                        "calling SMB_QFS_POSIX_WHOAMI with a small buffer\n");
 416
 417         torture_assert_int_equal(torture, whoami.num_gids, 0,
 418                         "invalid GID count");
 419         torture_assert_int_equal(torture, whoami.num_sids, 0,
 420                         "invalid SID count");
 421         torture_assert_int_equal(torture, whoami.num_sid_bytes, 0,
 422                         "invalid SID bytes count");
 423
 424         smbcli_tdis(cli);
 425
 426         return true;
 427 fail:
 428
 429         smbcli_tdis(cli);
 430         return ret;
 431 }
 432
 433 /* vim: set sts=8 sw=8 : */