1*43310Skfall /*- 2*43310Skfall * Copyright (c) 1990 The Regents of the University of California. 3*43310Skfall * All rights reserved. 4*43310Skfall * 5*43310Skfall * %sccs.include.redist.c% 6*43310Skfall */ 7*43310Skfall 8*43310Skfall #ifndef lint 9*43310Skfall static char sccsid[] = "@(#)klogin.c 5.1 (Berkeley) 06/19/90"; 10*43310Skfall #endif /* not lint */ 11*43310Skfall 12*43310Skfall #ifdef KERBEROS 13*43310Skfall #include <sys/param.h> 14*43310Skfall #include <sys/syslog.h> 15*43310Skfall #include <kerberosIV/des.h> 16*43310Skfall #include <kerberosIV/krb.h> 17*43310Skfall #include <pwd.h> 18*43310Skfall #include <netdb.h> 19*43310Skfall 20*43310Skfall #define PRINCIPAL_NAME pw->pw_name 21*43310Skfall #define PRINCIPAL_INST "" 22*43310Skfall #define INITIAL_TICKET "krbtgt" 23*43310Skfall #define VERIFY_SERVICE "rcmd" 24*43310Skfall 25*43310Skfall extern int notickets; 26*43310Skfall 27*43310Skfall /* 28*43310Skfall * return 0 on success 29*43310Skfall * 1 if Kerberos not around (try local) 30*43310Skfall * 2 on failure 31*43310Skfall */ 32*43310Skfall 33*43310Skfall klogin(pw, localhost, name, tty) 34*43310Skfall struct passwd *pw; 35*43310Skfall char *localhost, *name, *tty; 36*43310Skfall { 37*43310Skfall int kerror; 38*43310Skfall AUTH_DAT authdata; 39*43310Skfall KTEXT_ST ticket; 40*43310Skfall struct hostent *hp; 41*43310Skfall unsigned long faddr; 42*43310Skfall char tkfile[MAXPATHLEN], realm[REALM_SZ], savehost[MAXHOSTNAMELEN]; 43*43310Skfall 44*43310Skfall /* 45*43310Skfall * If we aren't Kerberos-authenticated, try the normal pw file 46*43310Skfall * for a password. If that's ok, log the user in without issueing 47*43310Skfall * any tickets. 48*43310Skfall */ 49*43310Skfall if (krb_get_lrealm(realm, 1) != KSUCCESS) 50*43310Skfall return(1); 51*43310Skfall 52*43310Skfall /* 53*43310Skfall * get TGT for local realm; by convention, store tickets in file 54*43310Skfall * associated with tty name, which should be available. 55*43310Skfall */ 56*43310Skfall (void)sprintf(tkfile, "%s_%s", TKT_ROOT, tty); 57*43310Skfall 58*43310Skfall if (setenv("KRBTKFILE", tkfile, 1) < 0) { 59*43310Skfall kerror = INTK_ERR; 60*43310Skfall syslog(LOG_ERR, "couldn't set tkfile environ"); 61*43310Skfall } else { 62*43310Skfall (void)unlink(tkfile); 63*43310Skfall kerror = krb_get_pw_in_tkt(PRINCIPAL_NAME, PRINCIPAL_INST, 64*43310Skfall realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, name); 65*43310Skfall } 66*43310Skfall 67*43310Skfall /* 68*43310Skfall * If we got a TGT, get a local "rcmd" ticket and check it so as to 69*43310Skfall * ensure that we are not talking to a bogus Kerberos server. 70*43310Skfall * 71*43310Skfall * There are 2 cases where we still allow a login: 72*43310Skfall * 1: the VERIFY_SERVICE doesn't exist in the KDC 73*43310Skfall * 2: local host has no srvtab, as (hopefully) indicated by a 74*43310Skfall * return value of RD_AP_UNDEC from krb_rd_req(). 75*43310Skfall */ 76*43310Skfall if (kerror != INTK_OK) { 77*43310Skfall (void)unlink(tkfile); 78*43310Skfall if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) 79*43310Skfall syslog(LOG_ERR, "Kerberos intkt error: %s", 80*43310Skfall krb_err_txt[kerror]); 81*43310Skfall return(2); 82*43310Skfall } 83*43310Skfall 84*43310Skfall if (chown(tkfile, pw->pw_uid, pw->pw_gid) < 0) 85*43310Skfall syslog(LOG_ERR, "chown tkfile: %m"); 86*43310Skfall 87*43310Skfall (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost)); 88*43310Skfall savehost[sizeof(savehost)-1] = NULL; 89*43310Skfall kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33); 90*43310Skfall 91*43310Skfall /* 92*43310Skfall * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host, 93*43310Skfall * still allow login with tickets, but log the error condition. 94*43310Skfall */ 95*43310Skfall if (kerror == KDC_PR_UNKNOWN) { 96*43310Skfall syslog(LOG_NOTICE, "warning: TGT not verified (%s)", 97*43310Skfall krb_err_txt[kerror]); 98*43310Skfall notickets = 0; 99*43310Skfall return(0); 100*43310Skfall } 101*43310Skfall 102*43310Skfall if (kerror != KSUCCESS) { 103*43310Skfall (void)printf("unable to use TGT: (%s)\n", krb_err_txt[kerror]); 104*43310Skfall syslog(LOG_NOTICE, "unable to use TGT: (%s)", 105*43310Skfall krb_err_txt[kerror]); 106*43310Skfall dest_tkt(); 107*43310Skfall return(2); 108*43310Skfall } 109*43310Skfall 110*43310Skfall if (!(hp = gethostbyname(localhost))) { 111*43310Skfall syslog(LOG_ERR, "couldn't get local host address"); 112*43310Skfall return(2); 113*43310Skfall } 114*43310Skfall bcopy((void *)hp->h_addr, (void *)&faddr, sizeof(faddr)); 115*43310Skfall 116*43310Skfall kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr, 117*43310Skfall &authdata, ""); 118*43310Skfall if (kerror == KSUCCESS) { 119*43310Skfall notickets = 0; 120*43310Skfall return(0); 121*43310Skfall } 122*43310Skfall if (kerror = RD_AP_UNDEC) { 123*43310Skfall syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]); 124*43310Skfall notickets = 0; 125*43310Skfall return(0); 126*43310Skfall } 127*43310Skfall (void)printf("unable to verify %s ticket: (%s)\n", VERIFY_SERVICE, 128*43310Skfall krb_err_txt[kerror]); 129*43310Skfall syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE, 130*43310Skfall krb_err_txt[kerror]); 131*43310Skfall return(2); 132*43310Skfall } 133*43310Skfall #endif 134