source3/winbindd/winbindd_pam_logoff.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async implementation of WINBINDD_PAM_LOGOFF
   4    Copyright (C) Volker Lendecke 2010
   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 "winbindd.h"
  22
  23 struct winbindd_pam_logoff_state {
  24         struct winbindd_request *request;
  25         struct winbindd_response *response;
  26 };
  27
  28 static void winbindd_pam_logoff_done(struct tevent_req *subreq);
  29
  30 struct tevent_req *winbindd_pam_logoff_send(TALLOC_CTX *mem_ctx,
  31                                             struct tevent_context *ev,
  32                                             struct winbindd_cli_state *cli,
  33                                             struct winbindd_request *request)
  34 {
  35         struct tevent_req *req, *subreq;
  36         struct winbindd_pam_logoff_state *state;
  37         struct winbindd_domain *domain;
  38         fstring name_domain, user;
  39         uid_t caller_uid;
  40         gid_t caller_gid;
  41         int res;
  42
  43         req = tevent_req_create(mem_ctx, &state,
  44                                 struct winbindd_pam_logoff_state);
  45         if (req == NULL) {
  46                 return NULL;
  47         }
  48         state->request = request;
  49
  50         /* Ensure null termination */
  51         /* Ensure null termination */
  52         request->data.logoff.user[sizeof(request->data.logoff.user)-1]='\0';
  53         request->data.logoff.krb5ccname[
  54                 sizeof(request->data.logoff.krb5ccname)-1]='\0';
  55
  56         DEBUG(3, ("[%5lu]: pam auth %s\n", (unsigned long)cli->pid,
  57                   request->data.auth.user));
  58
  59         if (request->data.logoff.uid == (uid_t)-1) {
  60                 goto failed;
  61         }
  62
  63         if (!canonicalize_username(request->data.logoff.user, name_domain,
  64                                    user)) {
  65                 goto failed;
  66         }
  67
  68         domain = find_auth_domain(request->flags, name_domain);
  69         if (domain == NULL) {
  70                 goto failed;
  71         }
  72
  73         caller_uid = (uid_t)-1;
  74
  75         res = getpeereid(cli->sock, &caller_uid, &caller_gid);
  76         if (res != 0) {
  77                 DEBUG(1,("winbindd_pam_logoff: failed to check peerid: %s\n",
  78                         strerror(errno)));
  79                 goto failed;
  80         }
  81
  82         switch (caller_uid) {
  83         case -1:
  84                 goto failed;
  85         case 0:
  86                 /* root must be able to logoff any user - gd */
  87                 break;
  88         default:
  89                 if (caller_uid != request->data.logoff.uid) {
  90                         DEBUG(1,("winbindd_pam_logoff: caller requested "
  91                                  "invalid uid\n"));
  92                         goto failed;
  93                 }
  94                 break;
  95         }
  96
  97         subreq = wb_domain_request_send(state, winbind_event_context(), domain,
  98                                         request);
  99         if (tevent_req_nomem(subreq, req)) {
 100                 return tevent_req_post(req, ev);
 101         }
 102         tevent_req_set_callback(subreq, winbindd_pam_logoff_done, req);
 103         return req;
 104
 105 failed:
 106         tevent_req_nterror(req, NT_STATUS_NO_SUCH_USER);
 107         return tevent_req_post(req, ev);
 108 }
 109
 110 static void winbindd_pam_logoff_done(struct tevent_req *subreq)
 111 {
 112         struct tevent_req *req = tevent_req_callback_data(
 113                 subreq, struct tevent_req);
 114         struct winbindd_pam_logoff_state *state = tevent_req_data(
 115                 req, struct winbindd_pam_logoff_state);
 116         int res, err;
 117
 118         res = wb_domain_request_recv(subreq, state, &state->response, &err);
 119         TALLOC_FREE(subreq);
 120         if (res == -1) {
 121                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 122                 return;
 123         }
 124         tevent_req_done(req);
 125 }
 126
 127 NTSTATUS winbindd_pam_logoff_recv(struct tevent_req *req,
 128                                   struct winbindd_response *response)
 129 {
 130         struct winbindd_pam_logoff_state *state = tevent_req_data(
 131                 req, struct winbindd_pam_logoff_state);
 132         NTSTATUS status;
 133
 134         if (tevent_req_is_nterror(req, &status)) {
 135                 set_auth_errors(response, status);
 136                 return status;
 137         }
 138         *response = *state->response;
 139         response->result = WINBINDD_PENDING;
 140         state->response = talloc_move(response, &state->response);
 141
 142         status = NT_STATUS(response->data.auth.nt_status);
 143         if (!NT_STATUS_IS_OK(status)) {
 144                 return status;
 145         }
 146         winbindd_delete_memory_creds(state->request->data.logoff.user);
 147         return status;
 148 }