/*- * Copyright (c) 1990, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "bsd_locl.h" RCSID("$Id: klogin.c,v 1.27 1999/10/04 16:11:48 bg Exp $"); #ifdef KERBEROS #define VERIFY_SERVICE "rcmd" extern int notickets; extern char *krbtkfile_env; static char tkt_location[MaxPathLen]; static int multiple_get_tkt(char *name, char *instance, char *realm, char *service, char *sinstance, int life, char *password) { int ret; int n; char rlm[256]; /* First try to verify against the supplied realm. */ ret = krb_get_pw_in_tkt(name, instance, realm, service, realm, life, password); if(ret == KSUCCESS) return KSUCCESS; /* Verify all local realms, except the supplied realm. */ for (n = 1; krb_get_lrealm(rlm, n) == KSUCCESS; n++) if (strcmp(rlm, realm) != 0) { ret = krb_get_pw_in_tkt(name, instance, rlm,service, rlm,life, password); if (ret == KSUCCESS) return KSUCCESS; } return ret; } /* * Attempt to log the user in using Kerberos authentication * * return 0 on success (will be logged in) * 1 if Kerberos failed (try local password in login) */ int klogin(struct passwd *pw, char *instance, char *localhost, char *password) { int kerror; AUTH_DAT authdata; KTEXT_ST ticket; struct hostent *hp; u_int32_t faddr; char realm[REALM_SZ], savehost[MaxHostNameLen]; extern int noticketsdontcomplain; #ifdef KLOGIN_PARANOID noticketsdontcomplain = 0; /* enable warning message */ #endif /* * Root logins don't use Kerberos. * If we have a realm, try getting a ticket-granting ticket * and using it to authenticate. Otherwise, return * failure so that we can try the normal passwd file * for a password. If that's ok, log the user in * without issuing any tickets. */ if (strcmp(pw->pw_name, "root") == 0 || krb_get_lrealm(realm, 1) != KSUCCESS) return (1); noticketsdontcomplain = 0; /* enable warning message */ /* * get TGT for local realm * tickets are stored in a file named TKT_ROOT plus uid * except for user.root tickets. */ if (strcmp(instance, "root") != 0) snprintf(tkt_location, sizeof(tkt_location), "%s%u_%u", TKT_ROOT, (unsigned)pw->pw_uid, (unsigned)getpid()); else { snprintf(tkt_location, sizeof(tkt_location), "%s_root_%d", TKT_ROOT, (unsigned)pw->pw_uid); } krbtkfile_env = tkt_location; krb_set_tkt_string(tkt_location); /* * Set real as well as effective ID to 0 for the moment, * to make the kerberos library do the right thing. */ if (setuid(0) < 0) { warnx("setuid"); return (1); } /* * Get ticket */ kerror = multiple_get_tkt(pw->pw_name, instance, realm, KRB_TICKET_GRANTING_TICKET, realm, DEFAULT_TKT_LIFE, password); /* * If we got a TGT, get a local "rcmd" ticket and check it so as to * ensure that we are not talking to a bogus Kerberos server. * * There are 2 cases where we still allow a login: * 1: the VERIFY_SERVICE doesn't exist in the KDC * 2: local host has no srvtab, as (hopefully) indicated by a * return value of RD_AP_UNDEC from krb_rd_req(). */ if (kerror != INTK_OK) { if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) { syslog(LOG_ERR, "Kerberos intkt error: %s", krb_get_err_text(kerror)); dest_tkt(); } return (1); } if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0) syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE); strlcpy(savehost, krb_get_phost(localhost), sizeof(savehost)); #ifdef KLOGIN_PARANOID /* * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host, * don't allow kerberos login, also log the error condition. */ kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33); if (kerror == KDC_PR_UNKNOWN) { syslog(LOG_NOTICE, "warning: TGT not verified (%s); %s.%s not registered, or srvtab is wrong?", krb_get_err_text(kerror), VERIFY_SERVICE, savehost); notickets = 0; return (1); } if (kerror != KSUCCESS) { warnx("unable to use TGT: (%s)", krb_get_err_text(kerror)); syslog(LOG_NOTICE, "unable to use TGT: (%s)", krb_get_err_text(kerror)); dest_tkt(); return (1); } if (!(hp = gethostbyname(localhost))) { syslog(LOG_ERR, "couldn't get local host address"); dest_tkt(); return (1); } memcpy(&faddr, hp->h_addr, sizeof(faddr)); kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr, &authdata, ""); if (kerror == KSUCCESS) { notickets = 0; return (0); } /* undecipherable: probably didn't have a srvtab on the local host */ if (kerror == RD_AP_UNDEC) { syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_get_err_text(kerror)); dest_tkt(); return (1); } /* failed for some other reason */ warnx("unable to verify %s ticket: (%s)", VERIFY_SERVICE, krb_get_err_text(kerror)); syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE, krb_get_err_text(kerror)); dest_tkt(); return (1); #else notickets = 0; return (0); #endif } #endif