1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)klogin.c 5.4 (Berkeley) 09/05/90"; 10 #endif /* not lint */ 11 12 #ifdef KERBEROS 13 #include <sys/param.h> 14 #include <sys/syslog.h> 15 #include <kerberosIV/des.h> 16 #include <kerberosIV/krb.h> 17 #include <pwd.h> 18 #include <netdb.h> 19 20 #define PRINCIPAL_NAME pw->pw_name 21 #define PRINCIPAL_INST "" 22 #define INITIAL_TICKET "krbtgt" 23 #define VERIFY_SERVICE "rcmd" 24 25 extern int notickets; 26 27 /* 28 * Attempt to log the user in using Kerberos authentication 29 * 30 * return 0 on success (will be logged in) 31 * 1 if Kerberos failed (try local password in login) 32 */ 33 34 klogin(pw, localhost, password) 35 struct passwd *pw; 36 char *localhost, *password; 37 { 38 int kerror; 39 AUTH_DAT authdata; 40 KTEXT_ST ticket; 41 struct hostent *hp; 42 unsigned long faddr; 43 char realm[REALM_SZ], savehost[MAXHOSTNAMELEN]; 44 char tkt_location[MAXPATHLEN]; 45 46 /* 47 * If we aren't Kerberos-authenticated, try the normal pw file 48 * for a password. If that's ok, log the user in without issueing 49 * any tickets. 50 */ 51 if (krb_get_lrealm(realm, 0) != KSUCCESS) { 52 syslog(LOG_ERR, "couldn't get local Kerberos realm"); 53 return(1); 54 } 55 56 /* 57 * get TGT for local realm 58 * tickets are stored in a file determined by calling tkt_string() 59 */ 60 61 (void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid); 62 (void)krb_set_tkt_string(tkt_location); 63 (void)dest_tkt(); 64 65 kerror = krb_get_pw_in_tkt(PRINCIPAL_NAME, PRINCIPAL_INST, 66 realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password); 67 /* 68 * If we got a TGT, get a local "rcmd" ticket and check it so as to 69 * ensure that we are not talking to a bogus Kerberos server. 70 * 71 * There are 2 cases where we still allow a login: 72 * 1: the VERIFY_SERVICE doesn't exist in the KDC 73 * 2: local host has no srvtab, as (hopefully) indicated by a 74 * return value of RD_AP_UNDEC from krb_rd_req(). 75 */ 76 if (kerror != INTK_OK) { 77 dest_tkt(); 78 if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) 79 syslog(LOG_ERR, "Kerberos intkt error: %s", 80 krb_err_txt[kerror]); 81 return(1); 82 } 83 84 if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0) 85 syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE); 86 87 (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost)); 88 savehost[sizeof(savehost)-1] = NULL; 89 90 /* 91 * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host, 92 * still allow login with tickets, but log the error condition. 93 */ 94 95 kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33); 96 if (kerror == KDC_PR_UNKNOWN) { 97 syslog(LOG_NOTICE, "warning: TGT not verified (%s)", 98 krb_err_txt[kerror]); 99 notickets = 0; 100 return(0); 101 } 102 103 if (kerror != KSUCCESS) { 104 (void)printf("unable to use TGT: (%s)\n", krb_err_txt[kerror]); 105 syslog(LOG_NOTICE, "unable to use TGT: (%s)", 106 krb_err_txt[kerror]); 107 dest_tkt(); 108 return(1); 109 } 110 111 if (!(hp = gethostbyname(localhost))) { 112 syslog(LOG_ERR, "couldn't get local host address"); 113 dest_tkt(); 114 return(1); 115 } 116 117 bcopy((void *)hp->h_addr, (void *)&faddr, sizeof(faddr)); 118 119 kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr, 120 &authdata, ""); 121 122 if (kerror == KSUCCESS) { 123 notickets = 0; 124 return(0); 125 } 126 127 /* undecipherable: probably didn't have a srvtab on the local host */ 128 if (kerror = RD_AP_UNDEC) { 129 syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]); 130 dest_tkt(); 131 return(1); 132 } 133 /* failed for some other reason */ 134 (void)printf("unable to verify %s ticket: (%s)\n", VERIFY_SERVICE, 135 krb_err_txt[kerror]); 136 syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE, 137 krb_err_txt[kerror]); 138 dest_tkt(); 139 return(1); 140 } 141 #endif 142