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_namespace, name_domain, user;
  39         uid_t caller_uid;
  40         gid_t caller_gid;
  41         int res;
  42         bool ok;
  43
  44         req = tevent_req_create(mem_ctx, &state,
  45                                 struct winbindd_pam_logoff_state);
  46         if (req == NULL) {
  47                 return NULL;
  48         }
  49         state->request = request;
  50
  51         /* Ensure null termination */
  52         /* Ensure null termination */
  53         request->data.logoff.user[sizeof(request->data.logoff.user)-1]='\0';
  54         request->data.logoff.krb5ccname[
  55                 sizeof(request->data.logoff.krb5ccname)-1]='\0';
  56
  57         DEBUG(3, ("[%5lu]: pam auth %s\n", (unsigned long)cli->pid,
  58                   request->data.auth.user));
  59
  60         if (request->data.logoff.uid == (uid_t)-1) {
  61                 goto failed;
  62         }
  63
  64         ok = canonicalize_username(request->data.logoff.user,
  65                                    name_namespace,
  66                                    name_domain,
  67                                    user);
  68         if (!ok) {
  69                 goto failed;
  70         }
  71
  72         domain = find_auth_domain(request->flags, name_namespace);
  73         if (domain == NULL) {
  74                 goto failed;
  75         }
  76
  77         caller_uid = (uid_t)-1;
  78
  79         res = getpeereid(cli->sock, &caller_uid, &caller_gid);
  80         if (res != 0) {
  81                 DEBUG(1,("winbindd_pam_logoff: failed to check peerid: %s\n",
  82                         strerror(errno)));
  83                 goto failed;
  84         }
  85
  86         switch (caller_uid) {
  87         case -1:
  88                 goto failed;
  89         case 0:
  90                 /* root must be able to logoff any user - gd */
  91                 break;
  92         default:
  93                 if (caller_uid != request->data.logoff.uid) {
  94                         DEBUG(1,("winbindd_pam_logoff: caller requested "
  95                                  "invalid uid\n"));
  96                         goto failed;
  97                 }
  98                 break;
  99         }
 100
 101         subreq = wb_domain_request_send(state, global_event_context(), domain,
 102                                         request);
 103         if (tevent_req_nomem(subreq, req)) {
 104                 return tevent_req_post(req, ev);
 105         }
 106         tevent_req_set_callback(subreq, winbindd_pam_logoff_done, req);
 107         return req;
 108
 109 failed:
 110         tevent_req_nterror(req, NT_STATUS_NO_SUCH_USER);
 111         return tevent_req_post(req, ev);
 112 }
 113
 114 static void winbindd_pam_logoff_done(struct tevent_req *subreq)
 115 {
 116         struct tevent_req *req = tevent_req_callback_data(
 117                 subreq, struct tevent_req);
 118         struct winbindd_pam_logoff_state *state = tevent_req_data(
 119                 req, struct winbindd_pam_logoff_state);
 120         int res, err;
 121
 122         res = wb_domain_request_recv(subreq, state, &state->response, &err);
 123         TALLOC_FREE(subreq);
 124         if (res == -1) {
 125                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 126                 return;
 127         }
 128         tevent_req_done(req);
 129 }
 130
 131 NTSTATUS winbindd_pam_logoff_recv(struct tevent_req *req,
 132                                   struct winbindd_response *response)
 133 {
 134         struct winbindd_pam_logoff_state *state = tevent_req_data(
 135                 req, struct winbindd_pam_logoff_state);
 136         NTSTATUS status;
 137
 138         if (tevent_req_is_nterror(req, &status)) {
 139                 set_auth_errors(response, status);
 140                 return status;
 141         }
 142         *response = *state->response;
 143         response->result = WINBINDD_PENDING;
 144         state->response = talloc_move(response, &state->response);
 145
 146         status = NT_STATUS(response->data.auth.nt_status);
 147         if (!NT_STATUS_IS_OK(status)) {
 148                 return status;
 149         }
 150         winbindd_delete_memory_creds(state->request->data.logoff.user);
 151         return status;
 152 }