source/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 "torture/torture.h"
  22 #include "torture/basic/proto.h"
  23 #include "libcli/libcli.h"
  24 #include "libcli/raw/interfaces.h"
  25 #include "lib/cmdline/popt_common.h"
  26 #include "auth/credentials/credentials.h"
  27 #include "param/param.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(void *mem_ctx,
  70                 struct cli_credentials *creds)
  71 {
  72         NTSTATUS status;
  73         struct smbcli_state *cli;
  74
  75         const char *host = lp_parm_string(NULL, "torture", "host");
  76         const char *share = lp_parm_string(NULL, "torture", "share");
  77
  78         status = smbcli_full_connection(mem_ctx, &cli,
  79                                         host, share, NULL,
  80                                         creds, NULL);
  81
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 printf("failed to connect to //%s/%s: %s\n",
  84                         host, share, nt_errstr(status));
  85                 return NULL;
  86         }
  87
  88         return cli;
  89 }
  90
  91 static BOOL sid_parse(void *mem_ctx,
  92                 struct torture_context *torture,
  93                 DATA_BLOB *data, size_t *offset,
  94                 struct dom_sid **psid)
  95 {
  96         size_t remain = data->length - *offset;
  97         int i;
  98
  99         *psid = talloc_zero(mem_ctx, struct dom_sid);
 100         torture_assert(torture, *psid != NULL, "out of memory");
 101
 102         torture_assert(torture, remain >= 8,
 103                         "invalid SID format");
 104
 105         (*psid)->sid_rev_num = CVAL(data->data, *offset);
 106         (*psid)->num_auths = CVAL(data->data, *offset + 1);
 107         memcpy((*psid)->id_auth, data->data + *offset + 2, 6);
 108
 109         (*offset) += 8;
 110         remain = data->length - *offset;
 111
 112         torture_assert(torture, remain >= ((*psid)->num_auths * 4),
 113                         "invalid sub_auth byte count");
 114         torture_assert(torture, (*psid)->num_auths >= 0,
 115                         "invalid sub_auth value");
 116         torture_assert(torture, (*psid)->num_auths <= 15,
 117                         "invalid sub_auth value");
 118
 119         (*psid)->sub_auths = talloc_array(mem_ctx, uint32_t,
 120                         (*psid)->num_auths);
 121         torture_assert(torture, (*psid)->sub_auths != NULL,
 122                         "out of memory");
 123
 124         for (i = 0; i < (*psid)->num_auths; i++) {
 125                 (*psid)->sub_auths[i] = IVAL(data->data, *offset);
 126                 (*offset) += 4;
 127         }
 128
 129         return True;
 130 }
 131
 132 static BOOL smb_raw_query_posix_whoami(void *mem_ctx,
 133                                 struct torture_context *torture,
 134                                 struct smbcli_state *cli,
 135                                 struct smb_whoami *whoami,
 136                                 unsigned max_data)
 137 {
 138         struct smb_trans2 tp;
 139         NTSTATUS status;
 140         size_t offset;
 141         int i;
 142
 143         uint16_t setup = TRANSACT2_QFSINFO;
 144         uint16_t info_level;
 145
 146         ZERO_STRUCTP(whoami);
 147
 148         tp.in.max_setup = 0;
 149         tp.in.flags = 0;
 150         tp.in.timeout = 0;
 151         tp.in.setup_count = 1;
 152         tp.in.max_param = 10;
 153         tp.in.max_data = (uint16_t)max_data;
 154         tp.in.setup = &setup;
 155         tp.in.trans_name = NULL;
 156         SSVAL(&info_level, 0, SMB_QFS_POSIX_WHOAMI);
 157         tp.in.params = data_blob_talloc(mem_ctx, &info_level, 2);
 158         tp.in.data = data_blob_talloc(mem_ctx, NULL, 0);
 159
 160         status = smb_raw_trans2(cli->tree, mem_ctx, &tp);
 161         torture_assert_ntstatus_equal(torture, status, NT_STATUS_OK,
 162                         "doing SMB_QFS_POSIX_WHOAMI");
 163
 164         /* Make sure we got back all the required fields. */
 165         torture_assert(torture, tp.out.params.length == 0,
 166                         "trans2 params should be empty");
 167         torture_assert(torture, tp.out.data.length >= WHOAMI_REQUIRED_SIZE,
 168                         "checking for required response fields");
 169
 170         whoami->mapping_flags = IVAL(tp.out.data.data, 0);
 171         whoami->mapping_mask = IVAL(tp.out.data.data, 4);
 172         whoami->server_uid = BVAL(tp.out.data.data, 8);
 173         whoami->server_gid = BVAL(tp.out.data.data, 16);
 174         whoami->num_gids = IVAL(tp.out.data.data, 24);
 175         whoami->num_sids = IVAL(tp.out.data.data, 28);
 176         whoami->num_sid_bytes = IVAL(tp.out.data.data, 32);
 177         whoami->reserved = IVAL(tp.out.data.data, 36);
 178
 179         /* The GID list and SID list are optional, depending on the count
 180          * and length fields.
 181          */
 182         if (whoami->num_sids != 0) {
 183                 torture_assert(torture, whoami->num_sid_bytes != 0,
 184                                 "SID count does not match byte count");
 185         }
 186
 187         printf("\tmapping_flags=0x%08x mapping_mask=0x%08x\n",
 188                         whoami->mapping_flags, whoami->mapping_mask);
 189         printf("\tserver UID=%llu GID=%llu\n",
 190                (unsigned long long)whoami->server_uid, (unsigned long long)whoami->server_gid);
 191         printf("\t%u GIDs, %u SIDs, %u SID bytes\n",
 192                         whoami->num_gids, whoami->num_sids,
 193                         whoami->num_sid_bytes);
 194
 195         offset = WHOAMI_REQUIRED_SIZE;
 196
 197         torture_assert_int_equal(torture, whoami->reserved, 0,
 198                         "invalid reserved field");
 199
 200         if (tp.out.data.length == offset) {
 201                 /* No SIDs or GIDs returned */
 202                 torture_assert_int_equal(torture, whoami->num_gids, 0,
 203                                 "invalid GID count");
 204                 torture_assert_int_equal(torture, whoami->num_sids, 0,
 205                                 "invalid SID count");
 206                 torture_assert_int_equal(torture, whoami->num_sid_bytes, 0,
 207                                 "invalid SID byte count");
 208                 return True;
 209         }
 210
 211         if (whoami->num_gids != 0) {
 212                 int remain = tp.out.data.length - offset;
 213                 int gid_bytes = whoami->num_gids * 8;
 214
 215                 if (whoami->num_sids == 0) {
 216                         torture_assert_int_equal(torture, remain, gid_bytes,
 217                                         "GID count does not match data length");
 218                 } else {
 219                         torture_assert(torture, remain > gid_bytes,
 220                                                 "invalid GID count");
 221                 }
 222
 223                 whoami->gid_list = talloc_array(mem_ctx, uint64_t, whoami->num_gids);
 224                 torture_assert(torture, whoami->gid_list != NULL, "out of memory");
 225
 226                 for (i = 0; i < whoami->num_gids; ++i) {
 227                         whoami->gid_list[i] = BVAL(tp.out.data.data, offset);
 228                         offset += 8;
 229                 }
 230         }
 231
 232         /* Check if there should be data left for the SID list. */
 233         if (tp.out.data.length == offset) {
 234                 torture_assert_int_equal(torture, whoami->num_sids, 0,
 235                                 "invalid SID count");
 236                 return True;
 237         }
 238
 239         /* All the remaining bytes must be the SID list. */
 240         torture_assert_int_equal(torture,
 241                 whoami->num_sid_bytes, (tp.out.data.length - offset),
 242                 "invalid SID byte count");
 243
 244         if (whoami->num_sids != 0) {
 245
 246                 whoami->sid_list = talloc_array(mem_ctx, struct dom_sid *,
 247                                 whoami->num_sids);
 248                 torture_assert(torture, whoami->sid_list != NULL,
 249                                 "out of memory");
 250
 251                 for (i = 0; i < whoami->num_sids; ++i) {
 252                         if (!sid_parse(mem_ctx, torture,
 253                                         &tp.out.data, &offset,
 254                                         &whoami->sid_list[i])) {
 255                                 return False;
 256                         }
 257
 258                 }
 259         }
 260
 261         /* We should be at the end of the response now. */
 262         torture_assert_int_equal(torture, tp.out.data.length, offset,
 263                         "trailing garbage bytes");
 264
 265         return True;
 266 }
 267
 268 BOOL torture_unix_whoami(struct torture_context *torture)
 269 {
 270         struct smbcli_state *cli;
 271         struct cli_credentials *anon_credentials;
 272         struct smb_whoami whoami;
 273         void *mem_ctx;
 274
 275         mem_ctx = talloc_init("smb_query_posix_whoami");
 276         torture_assert(torture, mem_ctx != NULL, "malloc failed");
 277
 278         if (!(cli = connect_to_server(mem_ctx, cmdline_credentials))) {
 279                 goto fail;
 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(mem_ctx, torture,
 285                                 cli, &whoami, 0xFFFF)) {
 286                 smbcli_tdis(cli);
 287                 goto fail;
 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(mem_ctx, torture,
 293                                 cli, &whoami, 0x40)) {
 294                 smbcli_tdis(cli);
 295                 goto fail;
 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(mem_ctx);
 309
 310         if (!(cli = connect_to_server(mem_ctx, anon_credentials))) {
 311                 goto fail;
 312         }
 313
 314         if (!smb_raw_query_posix_whoami(mem_ctx, torture,
 315                                 cli, &whoami, 0xFFFF)) {
 316                 smbcli_tdis(cli);
 317                 goto fail;
 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         talloc_free(mem_ctx);
 335         return True;
 336
 337 fail:
 338         talloc_free(mem_ctx);
 339         return False;
 340
 341 }
 342
 343 /* vim: set sts=8 sw=8 : */