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