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/interfaces.h"
  23 #include "libcli/raw/raw_proto.h"
  24 #include "torture/torture.h"
  25 #include "torture/basic/proto.h"
  26 #include "lib/cmdline/popt_common.h"
  27 #include "auth/credentials/credentials.h"
  28 #include "param/param.h"
  29 #include "libcli/resolve/resolve.h"
  30
  31 /* Size (in bytes) of the required fields in the SMBwhoami response. */
  32 #define WHOAMI_REQUIRED_SIZE    40
  33
  34 enum smb_whoami_flags {
  35     SMB_WHOAMI_GUEST = 0x1 /* Logged in as (or squashed to) guest */
  36 };
  37
  38 /*
  39    SMBWhoami - Query the user mapping performed by the server for the
  40    connected tree. This is a subcommand of the TRANS2_QFSINFO.
  41
  42    Returns:
  43        4 bytes unsigned -      mapping flags (smb_whoami_flags)
  44        4 bytes unsigned -      flags mask
  45
  46        8 bytes unsigned -      primary UID
  47        8 bytes unsigned -      primary GID
  48        4 bytes unsigned -      number of supplementary GIDs
  49        4 bytes unsigned -      number of SIDs
  50        4 bytes unsigned -      SID list byte count
  51        4 bytes -               pad / reserved (must be zero)
  52
  53        8 bytes unsigned[] -    list of GIDs (may be empty)
  54        DOM_SID[] -             list of SIDs (may be empty)
  55 */
  56
  57 struct smb_whoami
  58 {
  59         uint32_t        mapping_flags;
  60         uint32_t        mapping_mask;
  61         uint64_t        server_uid;
  62         uint64_t        server_gid;
  63         uint32_t        num_gids;
  64         uint32_t        num_sids;
  65         uint32_t        num_sid_bytes;
  66         uint32_t        reserved; /* Must be zero */
  67         uint64_t *      gid_list;
  68         struct dom_sid ** sid_list;
  69 };
  70
  71 static struct smbcli_state *connect_to_server(struct torture_context *tctx,
  72                 struct cli_credentials *creds)
  73 {
  74         NTSTATUS status;
  75         struct smbcli_state *cli;
  76
  77         const char *host = torture_setting_string(tctx, "host", NULL);
  78         const char *share = torture_setting_string(tctx, "share", NULL);
  79         struct smbcli_options options;
  80         struct smbcli_session_options session_options;
  81
  82         lp_smbcli_options(tctx->lp_ctx, &options);
  83         lp_smbcli_session_options(tctx->lp_ctx, &session_options);
  84
  85         status = smbcli_full_connection(tctx, &cli, host,
  86                                         lp_smb_ports(tctx->lp_ctx),
  87                                         share, NULL, lp_socket_options(tctx->lp_ctx),
  88                                         creds, lp_resolve_context(tctx->lp_ctx),
  89                                         tctx->ev, &options, &session_options,
  90                                         lp_iconv_convenience(tctx->lp_ctx),
  91                                         lp_gensec_settings(tctx, tctx->lp_ctx));
  92
  93         if (!NT_STATUS_IS_OK(status)) {
  94                 printf("failed to connect to //%s/%s: %s\n",
  95                         host, share, nt_errstr(status));
  96                 return NULL;
  97         }
  98
  99         return cli;
 100 }
 101
 102 static bool sid_parse(void *mem_ctx,
 103                 struct torture_context *torture,
 104                 DATA_BLOB *data, size_t *offset,
 105                 struct dom_sid **psid)
 106 {
 107         size_t remain = data->length - *offset;
 108         int i;
 109
 110         *psid = talloc_zero(mem_ctx, struct dom_sid);
 111         torture_assert(torture, *psid != NULL, "out of memory");
 112
 113         torture_assert(torture, remain >= 8,
 114                         "invalid SID format");
 115
 116         (*psid)->sid_rev_num = CVAL(data->data, *offset);
 117         (*psid)->num_auths = CVAL(data->data, *offset + 1);
 118         memcpy((*psid)->id_auth, data->data + *offset + 2, 6);
 119
 120         (*offset) += 8;
 121         remain = data->length - *offset;
 122
 123         torture_assert(torture, remain >= ((*psid)->num_auths * 4),
 124                         "invalid sub_auth byte count");
 125         torture_assert(torture, (*psid)->num_auths >= 0,
 126                         "invalid sub_auth value");
 127         torture_assert(torture, (*psid)->num_auths <= 15,
 128                         "invalid sub_auth value");
 129
 130         (*psid)->sub_auths = talloc_array(mem_ctx, uint32_t,
 131                         (*psid)->num_auths);
 132         torture_assert(torture, (*psid)->sub_auths != NULL,
 133                         "out of memory");
 134
 135         for (i = 0; i < (*psid)->num_auths; i++) {
 136                 (*psid)->sub_auths[i] = IVAL(data->data, *offset);
 137                 (*offset) += 4;
 138         }
 139
 140         return true;
 141 }
 142
 143 static bool smb_raw_query_posix_whoami(void *mem_ctx,
 144                                 struct torture_context *torture,
 145                                 struct smbcli_state *cli,
 146                                 struct smb_whoami *whoami,
 147                                 unsigned max_data)
 148 {
 149         struct smb_trans2 tp;
 150         NTSTATUS status;
 151         size_t offset;
 152         int i;
 153
 154         uint16_t setup = TRANSACT2_QFSINFO;
 155         uint16_t info_level;
 156
 157         ZERO_STRUCTP(whoami);
 158
 159         tp.in.max_setup = 0;
 160         tp.in.flags = 0;
 161         tp.in.timeout = 0;
 162         tp.in.setup_count = 1;
 163         tp.in.max_param = 10;
 164         tp.in.max_data = (uint16_t)max_data;
 165         tp.in.setup = &setup;
 166         tp.in.trans_name = NULL;
 167         SSVAL(&info_level, 0, SMB_QFS_POSIX_WHOAMI);
 168         tp.in.params = data_blob_talloc(mem_ctx, &info_level, 2);
 169         tp.in.data = data_blob_talloc(mem_ctx, NULL, 0);
 170
 171         status = smb_raw_trans2(cli->tree, mem_ctx, &tp);
 172         torture_assert_ntstatus_equal(torture, status, NT_STATUS_OK,
 173                         "doing SMB_QFS_POSIX_WHOAMI");
 174
 175         /* Make sure we got back all the required fields. */
 176         torture_assert(torture, tp.out.params.length == 0,
 177                         "trans2 params should be empty");
 178         torture_assert(torture, tp.out.data.length >= WHOAMI_REQUIRED_SIZE,
 179                         "checking for required response fields");
 180
 181         whoami->mapping_flags = IVAL(tp.out.data.data, 0);
 182         whoami->mapping_mask = IVAL(tp.out.data.data, 4);
 183         whoami->server_uid = BVAL(tp.out.data.data, 8);
 184         whoami->server_gid = BVAL(tp.out.data.data, 16);
 185         whoami->num_gids = IVAL(tp.out.data.data, 24);
 186         whoami->num_sids = IVAL(tp.out.data.data, 28);
 187         whoami->num_sid_bytes = IVAL(tp.out.data.data, 32);
 188         whoami->reserved = IVAL(tp.out.data.data, 36);
 189
 190         /* The GID list and SID list are optional, depending on the count
 191          * and length fields.
 192          */
 193         if (whoami->num_sids != 0) {
 194                 torture_assert(torture, whoami->num_sid_bytes != 0,
 195                                 "SID count does not match byte count");
 196         }
 197
 198         printf("\tmapping_flags=0x%08x mapping_mask=0x%08x\n",
 199                         whoami->mapping_flags, whoami->mapping_mask);
 200         printf("\tserver UID=%llu GID=%llu\n",
 201                (unsigned long long)whoami->server_uid, (unsigned long long)whoami->server_gid);
 202         printf("\t%u GIDs, %u SIDs, %u SID bytes\n",
 203                         whoami->num_gids, whoami->num_sids,
 204                         whoami->num_sid_bytes);
 205
 206         offset = WHOAMI_REQUIRED_SIZE;
 207
 208         torture_assert_int_equal(torture, whoami->reserved, 0,
 209                         "invalid reserved field");
 210
 211         if (tp.out.data.length == offset) {
 212                 /* No SIDs or GIDs returned */
 213                 torture_assert_int_equal(torture, whoami->num_gids, 0,
 214                                 "invalid GID count");
 215                 torture_assert_int_equal(torture, whoami->num_sids, 0,
 216                                 "invalid SID count");
 217                 torture_assert_int_equal(torture, whoami->num_sid_bytes, 0,
 218                                 "invalid SID byte count");
 219                 return true;
 220         }
 221
 222         if (whoami->num_gids != 0) {
 223                 int remain = tp.out.data.length - offset;
 224                 int gid_bytes = whoami->num_gids * 8;
 225
 226                 if (whoami->num_sids == 0) {
 227                         torture_assert_int_equal(torture, remain, gid_bytes,
 228                                         "GID count does not match data length");
 229                 } else {
 230                         torture_assert(torture, remain > gid_bytes,
 231                                                 "invalid GID count");
 232                 }
 233
 234                 whoami->gid_list = talloc_array(mem_ctx, uint64_t, whoami->num_gids);
 235                 torture_assert(torture, whoami->gid_list != NULL, "out of memory");
 236
 237                 for (i = 0; i < whoami->num_gids; ++i) {
 238                         whoami->gid_list[i] = BVAL(tp.out.data.data, offset);
 239                         offset += 8;
 240                 }
 241         }
 242
 243         /* Check if there should be data left for the SID list. */
 244         if (tp.out.data.length == offset) {
 245                 torture_assert_int_equal(torture, whoami->num_sids, 0,
 246                                 "invalid SID count");
 247                 return true;
 248         }
 249
 250         /* All the remaining bytes must be the SID list. */
 251         torture_assert_int_equal(torture,
 252                 whoami->num_sid_bytes, (tp.out.data.length - offset),
 253                 "invalid SID byte count");
 254
 255         if (whoami->num_sids != 0) {
 256
 257                 whoami->sid_list = talloc_array(mem_ctx, struct dom_sid *,
 258                                 whoami->num_sids);
 259                 torture_assert(torture, whoami->sid_list != NULL,
 260                                 "out of memory");
 261
 262                 for (i = 0; i < whoami->num_sids; ++i) {
 263                         if (!sid_parse(mem_ctx, torture,
 264                                         &tp.out.data, &offset,
 265                                         &whoami->sid_list[i])) {
 266                                 return false;
 267                         }
 268
 269                 }
 270         }
 271
 272         /* We should be at the end of the response now. */
 273         torture_assert_int_equal(torture, tp.out.data.length, offset,
 274                         "trailing garbage bytes");
 275
 276         return true;
 277 }
 278
 279 bool torture_unix_whoami(struct torture_context *torture)
 280 {
 281         struct smbcli_state *cli;
 282         struct cli_credentials *anon_credentials;
 283         struct smb_whoami whoami;
 284
 285         if (!(cli = connect_to_server(torture, cmdline_credentials))) {
 286                 return false;
 287         }
 288
 289         /* Test basic authenticated mapping. */
 290         printf("calling SMB_QFS_POSIX_WHOAMI on an authenticated connection\n");
 291         if (!smb_raw_query_posix_whoami(torture, torture,
 292                                 cli, &whoami, 0xFFFF)) {
 293                 smbcli_tdis(cli);
 294                 return false;
 295         }
 296
 297         /* Test that the server drops the UID and GID list. */
 298         printf("calling SMB_QFS_POSIX_WHOAMI with a small buffer\n");
 299         if (!smb_raw_query_posix_whoami(torture, torture,
 300                                 cli, &whoami, 0x40)) {
 301                 smbcli_tdis(cli);
 302                 return false;
 303         }
 304
 305         torture_assert_int_equal(torture, whoami.num_gids, 0,
 306                         "invalid GID count");
 307         torture_assert_int_equal(torture, whoami.num_sids, 0,
 308                         "invalid SID count");
 309         torture_assert_int_equal(torture, whoami.num_sid_bytes, 0,
 310                         "invalid SID bytes count");
 311
 312         smbcli_tdis(cli);
 313
 314         printf("calling SMB_QFS_POSIX_WHOAMI on an anonymous connection\n");
 315         anon_credentials = cli_credentials_init_anon(torture);
 316
 317         if (!(cli = connect_to_server(torture, anon_credentials))) {
 318                 return false;
 319         }
 320
 321         if (!smb_raw_query_posix_whoami(torture, torture,
 322                                 cli, &whoami, 0xFFFF)) {
 323                 smbcli_tdis(cli);
 324                 return false;
 325         }
 326
 327         smbcli_tdis(cli);
 328
 329         /* Check that our anonymous login mapped us to guest on the server, but
 330          * only if the server supports this.
 331          */
 332         if (whoami.mapping_mask & SMB_WHOAMI_GUEST) {
 333                 printf("checking whether we were logged in as guest... %s\n",
 334                         whoami.mapping_flags & SMB_WHOAMI_GUEST ? "YES" : "NO");
 335                 torture_assert(torture, whoami.mapping_flags & SMB_WHOAMI_GUEST,
 336                                 "anonymous login did not map to guest");
 337         } else {
 338                 printf("server does not support SMB_WHOAMI_GUEST flag\n");
 339         }
 340
 341         return true;
 342 }
 343
 344 /* vim: set sts=8 sw=8 : */