diff options
Diffstat (limited to 'crypto/kerberosIV/appl/bsd/klogin.c')
| -rw-r--r-- | crypto/kerberosIV/appl/bsd/klogin.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/crypto/kerberosIV/appl/bsd/klogin.c b/crypto/kerberosIV/appl/bsd/klogin.c new file mode 100644 index 0000000..321da64 --- /dev/null +++ b/crypto/kerberosIV/appl/bsd/klogin.c @@ -0,0 +1,184 @@ +/*- + * 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 1.20 1997/05/02 14:27:42 assar Exp $"); + +#ifdef KERBEROS + +#define VERIFY_SERVICE "rcmd" + +extern int notickets; +extern char *krbtkfile_env; + +static char tkt_location[MaxPathLen]; + +/* + * 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, 0) != 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); + + kerror = krb_get_pw_in_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); + + strncpy(savehost, krb_get_phost(localhost), sizeof(savehost)); + savehost[sizeof(savehost)-1] = '\0'; + +#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 |
