source4/winbind/wb_cmd_getgroups.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Backend for getgroups
   5
   6    Copyright (C) Matthieu Patou 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libcli/composite/composite.h"
  24 #include "winbind/wb_server.h"
  25 #include "smbd/service_task.h"
  26 #include "libcli/security/security.h"
  27
  28 struct cmd_getgroups_state {
  29         struct composite_context *ctx;
  30         struct wbsrv_service *service;
  31         char* username;
  32         uint32_t num_groups;
  33         uint32_t current_group;
  34         struct dom_sid **sids;
  35
  36         gid_t *gids;
  37 };
  38
  39 /* The idea is to get the groups for a user
  40    We receive one user from this we search for his uid
  41    From the uid we search for his SID
  42    From the SID we search for the list of groups
  43    And with the list of groups we search for each group its gid
  44 */
  45 static void cmd_getgroups_recv_pwnam(struct composite_context *ctx);
  46 static void wb_getgroups_uid2sid_recv(struct composite_context *ctx);
  47 static void wb_getgroups_userdomsgroups_recv(struct composite_context *ctx);
  48 static void cmd_getgroups_recv_gid(struct composite_context *ctx);
  49
  50 /*
  51   Ask for the uid from the username
  52 */
  53 struct composite_context *wb_cmd_getgroups_send(TALLOC_CTX *mem_ctx,
  54                                                 struct wbsrv_service *service,
  55                                                 const char* username)
  56 {
  57         struct composite_context *ctx, *result;
  58         struct cmd_getgroups_state *state;
  59
  60         DEBUG(5, ("wb_cmd_getgroups_send called\n"));
  61
  62         result = composite_create(mem_ctx, service->task->event_ctx);
  63         if (!result) return NULL;
  64
  65         state = talloc(mem_ctx, struct cmd_getgroups_state);
  66         if (composite_nomem(state, result)) return result;
  67
  68         state->ctx = result;
  69         result->private_data = state;
  70         state->service = service;
  71         state->num_groups = 0;
  72
  73         state->username = talloc_strdup(state,username);
  74         if (composite_nomem(state->username, result)) return result;
  75
  76         ctx = wb_cmd_getpwnam_send(state, service, username);
  77         if (composite_nomem(ctx, result)) return result;
  78
  79         composite_continue(result, ctx, cmd_getgroups_recv_pwnam, state);
  80         return result;
  81 }
  82
  83 /*
  84   Receive the uid and send request for SID
  85 */
  86 static void cmd_getgroups_recv_pwnam(struct composite_context *ctx)
  87 {
  88         struct composite_context *res;
  89         struct cmd_getgroups_state *state =
  90                 talloc_get_type(ctx->async.private_data,
  91                                 struct cmd_getgroups_state);
  92         struct winbindd_pw *pw;
  93         struct wbsrv_service *service = state->service;
  94
  95         DEBUG(5, ("cmd_getgroups_recv_pwnam called\n"));
  96
  97         state->ctx->status = wb_cmd_getpwnam_recv(ctx, state, &pw);
  98         if (composite_is_ok(state->ctx)) {
  99                 res = wb_uid2sid_send(state, service, pw->pw_uid);
 100                 if (res == NULL) {
 101                         composite_error(state->ctx, NT_STATUS_NO_MEMORY);
 102                         return;
 103                 }
 104                 DEBUG(6, ("cmd_getgroups_recv_pwnam uid %d\n",pw->pw_uid));
 105
 106                 composite_continue(ctx, res, wb_getgroups_uid2sid_recv, state);
 107         }
 108 }
 109
 110 /*
 111   Receive the SID and request groups through the userdomgroups helper
 112 */
 113 static void wb_getgroups_uid2sid_recv(struct composite_context *ctx)
 114 {
 115         struct composite_context *res;
 116         struct cmd_getgroups_state *state =
 117                 talloc_get_type(ctx->async.private_data,
 118                                 struct cmd_getgroups_state);
 119         NTSTATUS status;
 120         struct dom_sid *sid;
 121         char *sid_str;
 122
 123         DEBUG(5, ("wb_getgroups_uid2sid_recv called\n"));
 124
 125         status = wb_uid2sid_recv(ctx, state, &sid);
 126         if(NT_STATUS_IS_OK(status)) {
 127                 sid_str = dom_sid_string(state, sid);
 128
 129                 /* If the conversion failed, bail out with a failure. */
 130                 if (sid_str != NULL) {
 131                         DEBUG(7, ("wb_getgroups_uid2sid_recv SID = %s\n",sid_str));
 132                         /* Ok got the SID now get the groups */
 133                         res = wb_cmd_userdomgroups_send(state, state->service, sid);
 134                         if (res == NULL) {
 135                                 composite_error(state->ctx,
 136                                                 NT_STATUS_NO_MEMORY);
 137                                 return;
 138                         }
 139
 140                         composite_continue(ctx, res, wb_getgroups_userdomsgroups_recv, state);
 141                 } else {
 142                         composite_error(state->ctx, NT_STATUS_UNSUCCESSFUL);
 143                 }
 144         }
 145 }
 146
 147 /*
 148   Receive groups and search for uid for the first group
 149 */
 150 static void wb_getgroups_userdomsgroups_recv(struct composite_context *ctx) {
 151         struct cmd_getgroups_state *state =
 152                 talloc_get_type(ctx->async.private_data,
 153                                 struct cmd_getgroups_state);
 154         uint32_t num_sids;
 155         struct dom_sid **sids;
 156
 157         DEBUG(5, ("wb_getgroups_userdomsgroups_recv called\n"));
 158         state->ctx->status = wb_cmd_userdomgroups_recv(ctx,state,&num_sids,&sids);
 159         if (!composite_is_ok(state->ctx)) return;
 160
 161         DEBUG(5, ("wb_getgroups_userdomsgroups_recv %d groups\n",num_sids));
 162
 163         state->sids=sids;
 164         state->num_groups=num_sids;
 165         state->current_group=0;
 166
 167         if(num_sids > 0) {
 168                 state->gids = talloc_array(state, gid_t, state->num_groups);
 169                 ctx = wb_sid2gid_send(state, state->service, state->sids[state->current_group]);
 170                 composite_continue(state->ctx, ctx, cmd_getgroups_recv_gid, state);
 171         } else {
 172                 composite_done(state->ctx);
 173         }
 174 }
 175
 176 /*
 177   Receive and uid the previous searched group and request the uid for the next one
 178 */
 179 static void cmd_getgroups_recv_gid(struct composite_context *ctx)
 180 {
 181         struct cmd_getgroups_state *state =
 182                 talloc_get_type(ctx->async.private_data,
 183                                 struct cmd_getgroups_state);
 184         gid_t gid;
 185
 186         DEBUG(5, ("cmd_getgroups_recv_gid called\n"));
 187
 188         state->ctx->status = wb_sid2gid_recv(ctx, &gid);
 189         if(!composite_is_ok(state->ctx)) return;
 190
 191         state->gids[state->current_group] = gid;
 192         DEBUG(5, ("cmd_getgroups_recv_gid group %d \n",state->current_group));
 193
 194         state->current_group++;
 195         if(state->current_group < state->num_groups ) {
 196                 ctx = wb_sid2gid_send(state, state->service, state->sids[state->current_group]);
 197                 composite_continue(state->ctx, ctx, cmd_getgroups_recv_gid, state);
 198         } else {
 199                 composite_done(state->ctx);
 200         }
 201 }
 202
 203 /*
 204   Return list of uids when finished
 205 */
 206 NTSTATUS wb_cmd_getgroups_recv(struct composite_context *ctx,
 207                                TALLOC_CTX *mem_ctx, gid_t **groups,
 208                                uint32_t *num_groups)
 209 {
 210         NTSTATUS status = composite_wait(ctx);
 211
 212         DEBUG(5, ("wb_cmd_getgroups_recv called\n"));
 213
 214         if (NT_STATUS_IS_OK(status)) {
 215                 struct cmd_getgroups_state *state =
 216                         talloc_get_type(ctx->private_data,
 217                                         struct cmd_getgroups_state);
 218                 *groups = talloc_steal(mem_ctx, state->gids);
 219                 *num_groups = state->num_groups;
 220         }
 221         talloc_free(ctx);
 222         return status;
 223 }