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