auth-sia.c

   1 /*
   2  * Copyright (c) 2002 Chris Adams.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #include "includes.h"
  26
  27 #ifdef HAVE_OSF_SIA
  28 #include <sia.h>
  29 #include <siad.h>
  30 #include <pwd.h>
  31 #include <signal.h>
  32 #include <setjmp.h>
  33 #include <sys/resource.h>
  34 #include <unistd.h>
  35 #include <stdarg.h>
  36 #include <string.h>
  37 #include <sys/types.h>
  38 #include <sys/security.h>
  39 #include <prot.h>
  40 #include <time.h>
  41
  42 #include "ssh.h"
  43 #include "key.h"
  44 #include "hostfile.h"
  45 #include "auth.h"
  46 #include "auth-sia.h"
  47 #include "log.h"
  48 #include "servconf.h"
  49 #include "canohost.h"
  50 #include "uidswap.h"
  51
  52 extern ServerOptions options;
  53 extern int saved_argc;
  54 extern char **saved_argv;
  55
  56 static int
  57 sia_password_change_required(const char *user)
  58 {
  59         struct es_passwd *acct;
  60         time_t pw_life;
  61         time_t pw_date;
  62
  63         set_auth_parameters(saved_argc, saved_argv);
  64
  65         if ((acct = getespwnam(user)) == NULL) {
  66                 error("Couldn't access protected database entry for %s", user);
  67                 endprpwent();
  68                 return (0);
  69         }
  70
  71         /* If forced password change flag is set, honor it */
  72         if (acct->uflg->fg_psw_chg_reqd && acct->ufld->fd_psw_chg_reqd) {
  73                 endprpwent();
  74                 return (1);
  75         }
  76
  77         /* Obtain password lifetime; if none, it can't have expired */
  78         if (acct->uflg->fg_expire)
  79                 pw_life = acct->ufld->fd_expire;
  80         else if (acct->sflg->fg_expire)
  81                 pw_life = acct->sfld->fd_expire;
  82         else {
  83                 endprpwent();
  84                 return (0);
  85         }
  86
  87         /* Offset from last change; if none, it must be expired */
  88         if (acct->uflg->fg_schange)
  89                 pw_date = acct->ufld->fd_schange + pw_life;
  90         else {
  91                 endprpwent();
  92                 return (1);
  93         }
  94
  95         endprpwent();
  96
  97         /* If expiration date is prior to now, change password */
  98
  99         return (pw_date <= time((time_t *) NULL));
 100 }
 101
 102 int
 103 sys_auth_passwd(Authctxt *authctxt, const char *pass)
 104 {
 105         int ret;
 106         SIAENTITY *ent = NULL;
 107         const char *host;
 108
 109         host = get_canonical_hostname(options.use_dns);
 110
 111         if (!authctxt->user || pass == NULL || pass[0] == '\0')
 112                 return (0);
 113
 114         if (sia_ses_init(&ent, saved_argc, saved_argv, host, authctxt->user,
 115             NULL, 0, NULL) != SIASUCCESS)
 116                 return (0);
 117
 118         if ((ret = sia_ses_authent(NULL, pass, ent)) != SIASUCCESS) {
 119                 error("Couldn't authenticate %s from %s",
 120                     authctxt->user, host);
 121                 if (ret & SIASTOP)
 122                         sia_ses_release(&ent);
 123
 124                 return (0);
 125         }
 126
 127         sia_ses_release(&ent);
 128
 129         authctxt->force_pwchange = sia_password_change_required(
 130                 authctxt->user);
 131
 132         return (1);
 133 }
 134
 135 void
 136 session_setup_sia(struct passwd *pw, char *tty)
 137 {
 138         SIAENTITY *ent = NULL;
 139         const char *host;
 140
 141         host = get_canonical_hostname(options.use_dns);
 142
 143         if (sia_ses_init(&ent, saved_argc, saved_argv, host, pw->pw_name,
 144             tty, 0, NULL) != SIASUCCESS)
 145                 fatal("sia_ses_init failed");
 146
 147         if (sia_make_entity_pwd(pw, ent) != SIASUCCESS) {
 148                 sia_ses_release(&ent);
 149                 fatal("sia_make_entity_pwd failed");
 150         }
 151
 152         ent->authtype = SIA_A_NONE;
 153         if (sia_ses_estab(sia_collect_trm, ent) != SIASUCCESS)
 154                 fatal("Couldn't establish session for %s from %s",
 155                     pw->pw_name, host);
 156
 157         if (sia_ses_launch(sia_collect_trm, ent) != SIASUCCESS)
 158                 fatal("Couldn't launch session for %s from %s",
 159                     pw->pw_name, host);
 160
 161         sia_ses_release(&ent);
 162
 163         setuid(0);
 164         permanently_set_uid(pw);
 165 }
 166
 167 #endif /* HAVE_OSF_SIA */