| 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 5.3 (Berkeley) %G%"; |
| 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, 1) != KSUCCESS) |
| 52 | return(1); |
| 53 | |
| 54 | /* |
| 55 | * get TGT for local realm |
| 56 | * tickets are stored in a file determined by calling tkt_string() |
| 57 | */ |
| 58 | |
| 59 | (void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid); |
| 60 | (void)krb_set_tkt_string(tkt_location); |
| 61 | (void)dest_tkt(); |
| 62 | |
| 63 | kerror = krb_get_pw_in_tkt(PRINCIPAL_NAME, PRINCIPAL_INST, |
| 64 | realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password); |
| 65 | /* |
| 66 | * If we got a TGT, get a local "rcmd" ticket and check it so as to |
| 67 | * ensure that we are not talking to a bogus Kerberos server. |
| 68 | * |
| 69 | * There are 2 cases where we still allow a login: |
| 70 | * 1: the VERIFY_SERVICE doesn't exist in the KDC |
| 71 | * 2: local host has no srvtab, as (hopefully) indicated by a |
| 72 | * return value of RD_AP_UNDEC from krb_rd_req(). |
| 73 | */ |
| 74 | if (kerror != INTK_OK) { |
| 75 | dest_tkt(); |
| 76 | if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) |
| 77 | syslog(LOG_ERR, "Kerberos intkt error: %s", |
| 78 | krb_err_txt[kerror]); |
| 79 | return(1); |
| 80 | } |
| 81 | |
| 82 | if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0) |
| 83 | syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE); |
| 84 | |
| 85 | (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost)); |
| 86 | savehost[sizeof(savehost)-1] = NULL; |
| 87 | |
| 88 | /* |
| 89 | * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host, |
| 90 | * still allow login with tickets, but log the error condition. |
| 91 | */ |
| 92 | |
| 93 | kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33); |
| 94 | if (kerror == KDC_PR_UNKNOWN) { |
| 95 | syslog(LOG_NOTICE, "warning: TGT not verified (%s)", |
| 96 | krb_err_txt[kerror]); |
| 97 | notickets = 0; |
| 98 | return(0); |
| 99 | } |
| 100 | |
| 101 | if (kerror != KSUCCESS) { |
| 102 | (void)printf("unable to use TGT: (%s)\n", krb_err_txt[kerror]); |
| 103 | syslog(LOG_NOTICE, "unable to use TGT: (%s)", |
| 104 | krb_err_txt[kerror]); |
| 105 | dest_tkt(); |
| 106 | return(1); |
| 107 | } |
| 108 | |
| 109 | if (!(hp = gethostbyname(localhost))) { |
| 110 | syslog(LOG_ERR, "couldn't get local host address"); |
| 111 | dest_tkt(); |
| 112 | return(1); |
| 113 | } |
| 114 | |
| 115 | bcopy((void *)hp->h_addr, (void *)&faddr, sizeof(faddr)); |
| 116 | |
| 117 | kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr, |
| 118 | &authdata, ""); |
| 119 | |
| 120 | if (kerror == KSUCCESS) { |
| 121 | notickets = 0; |
| 122 | return(0); |
| 123 | } |
| 124 | |
| 125 | /* undecipherable: probably didn't have a srvtab on the local host */ |
| 126 | if (kerror = RD_AP_UNDEC) { |
| 127 | syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]); |
| 128 | dest_tkt(); |
| 129 | return(1); |
| 130 | } |
| 131 | /* failed for some other reason */ |
| 132 | (void)printf("unable to verify %s ticket: (%s)\n", VERIFY_SERVICE, |
| 133 | krb_err_txt[kerror]); |
| 134 | syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE, |
| 135 | krb_err_txt[kerror]); |
| 136 | dest_tkt(); |
| 137 | return(1); |
| 138 | } |
| 139 | #endif |