Annotation of src/usr.bin/login/klogin.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: klogin.c,v 1.6 1995/03/08 19:41:36 brezak Exp $ */
! 2:
! 3: /*-
! 4: * Copyright (c) 1990, 1993, 1994
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by the University of
! 18: * California, Berkeley and its contributors.
! 19: * 4. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: */
! 35:
! 36: #ifndef lint
! 37: #if 0
! 38: static char sccsid[] = "@(#)klogin.c 8.3 (Berkeley) 4/2/94";
! 39: #endif
! 40: static char rcsid[] = "$NetBSD: klogin.c,v 1.6 1995/03/08 19:41:36 brezak Exp $";
! 41: #endif /* not lint */
! 42:
! 43: #ifdef KERBEROS
! 44: #include <sys/param.h>
! 45: #include <sys/syslog.h>
! 46: #include <kerberosIV/des.h>
! 47: #include <kerberosIV/krb.h>
! 48:
! 49: #include <err.h>
! 50: #include <netdb.h>
! 51: #include <pwd.h>
! 52: #include <stdio.h>
! 53: #include <stdlib.h>
! 54: #include <string.h>
! 55: #include <unistd.h>
! 56:
! 57: #include <sys/types.h>
! 58: #include <sys/stat.h>
! 59: #include <fcntl.h>
! 60:
! 61: #define INITIAL_TICKET "krbtgt"
! 62: #define VERIFY_SERVICE "rcmd"
! 63:
! 64: extern int notickets;
! 65: extern char *krbtkfile_env;
! 66: extern char *tty;
! 67:
! 68: static char tkt_location[MAXPATHLEN]; /* a pointer to this is returned... */
! 69:
! 70: /*
! 71: * Attempt to log the user in using Kerberos authentication
! 72: *
! 73: * return 0 on success (will be logged in)
! 74: * 1 if Kerberos failed (try local password in login)
! 75: */
! 76: int
! 77: klogin(pw, instance, localhost, password)
! 78: struct passwd *pw;
! 79: char *instance, *localhost, *password;
! 80: {
! 81: int kerror;
! 82: AUTH_DAT authdata;
! 83: KTEXT_ST ticket;
! 84: struct hostent *hp;
! 85: unsigned long faddr;
! 86: char realm[REALM_SZ], savehost[MAXHOSTNAMELEN];
! 87: char *krb_get_phost();
! 88:
! 89: #ifdef SKEY
! 90: /*
! 91: * We don't do s/key challenge and Kerberos at the same time
! 92: */
! 93: if (strcasecmp(password, "s/key") == 0) {
! 94: return (1);
! 95: }
! 96: #endif
! 97:
! 98: /*
! 99: * Root logins don't use Kerberos.
! 100: * If we have a realm, try getting a ticket-granting ticket
! 101: * and using it to authenticate. Otherwise, return
! 102: * failure so that we can try the normal passwd file
! 103: * for a password. If that's ok, log the user in
! 104: * without issuing any tickets.
! 105: */
! 106: if (strcmp(pw->pw_name, "root") == 0 ||
! 107: krb_get_lrealm(realm, 0) != KSUCCESS)
! 108: return (1);
! 109:
! 110: /*
! 111: * get TGT for local realm
! 112: * tickets are stored in a file named TKT_ROOT plus uid plus tty
! 113: * except for user.root tickets.
! 114: */
! 115:
! 116: if (strcmp(instance, "root") != 0)
! 117: (void)sprintf(tkt_location, "%s%d.%s",
! 118: TKT_ROOT, pw->pw_uid, tty);
! 119: else
! 120: (void)sprintf(tkt_location, "%s_root_%d.%s",
! 121: TKT_ROOT, pw->pw_uid, tty);
! 122: krbtkfile_env = tkt_location;
! 123: (void)krb_set_tkt_string(tkt_location);
! 124:
! 125: /*
! 126: * Set real as well as effective ID to 0 for the moment,
! 127: * to make the kerberos library do the right thing.
! 128: */
! 129: if (setuid(0) < 0) {
! 130: warnx("setuid");
! 131: return (1);
! 132: }
! 133: kerror = krb_get_pw_in_tkt(pw->pw_name, instance,
! 134: realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password);
! 135: /*
! 136: * If we got a TGT, get a local "rcmd" ticket and check it so as to
! 137: * ensure that we are not talking to a bogus Kerberos server.
! 138: *
! 139: * There are 2 cases where we still allow a login:
! 140: * 1: the VERIFY_SERVICE doesn't exist in the KDC
! 141: * 2: local host has no srvtab, as (hopefully) indicated by a
! 142: * return value of RD_AP_UNDEC from krb_rd_req().
! 143: */
! 144: if (kerror != INTK_OK) {
! 145: if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) {
! 146: syslog(LOG_ERR, "Kerberos intkt error: %s",
! 147: krb_err_txt[kerror]);
! 148: dest_tkt();
! 149: }
! 150: return (1);
! 151: }
! 152:
! 153: if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0)
! 154: syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE);
! 155:
! 156: (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost));
! 157: savehost[sizeof(savehost)-1] = NULL;
! 158:
! 159: /*
! 160: * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host,
! 161: * still allow login with tickets, but log the error condition.
! 162: */
! 163:
! 164: kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33);
! 165: if (kerror == KDC_PR_UNKNOWN) {
! 166: syslog(LOG_NOTICE,
! 167: "warning: TGT not verified (%s); %s.%s not registered, or srvtab is wrong?",
! 168: krb_err_txt[kerror], VERIFY_SERVICE, savehost);
! 169: notickets = 0;
! 170: /*
! 171: * but for security, don't allow root instances in under
! 172: * this condition!
! 173: */
! 174: if (strcmp(instance, "root") == 0) {
! 175: syslog(LOG_ERR, "Kerberos %s root instance login refused\n",
! 176: pw->pw_name);
! 177: dest_tkt();
! 178: return (1);
! 179: }
! 180: return (0);
! 181: }
! 182:
! 183: if (kerror != KSUCCESS) {
! 184: warnx("unable to use TGT: (%s)", krb_err_txt[kerror]);
! 185: syslog(LOG_NOTICE, "unable to use TGT: (%s)",
! 186: krb_err_txt[kerror]);
! 187: dest_tkt();
! 188: return (1);
! 189: }
! 190:
! 191: if (!(hp = gethostbyname(localhost))) {
! 192: syslog(LOG_ERR, "couldn't get local host address");
! 193: dest_tkt();
! 194: return (1);
! 195: }
! 196:
! 197: memmove((void *)&faddr, (void *)hp->h_addr, sizeof(faddr));
! 198:
! 199: kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr,
! 200: &authdata, "");
! 201:
! 202: if (kerror == KSUCCESS) {
! 203: notickets = 0;
! 204: return (0);
! 205: }
! 206:
! 207: /* undecipherable: probably didn't have a srvtab on the local host */
! 208: if (kerror = RD_AP_UNDEC) {
! 209: syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]);
! 210: dest_tkt();
! 211: return (1);
! 212: }
! 213: /* failed for some other reason */
! 214: warnx("unable to verify %s ticket: (%s)", VERIFY_SERVICE,
! 215: krb_err_txt[kerror]);
! 216: syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE,
! 217: krb_err_txt[kerror]);
! 218: dest_tkt();
! 219: return (1);
! 220: }
! 221:
! 222: void
! 223: kdestroy()
! 224: {
! 225: char *file = krbtkfile_env;
! 226: int i, fd;
! 227: extern int errno;
! 228: struct stat statb;
! 229: char buf[BUFSIZ];
! 230: #ifdef TKT_SHMEM
! 231: char shmidname[MAXPATHLEN];
! 232: #endif /* TKT_SHMEM */
! 233:
! 234: if (krbtkfile_env == NULL)
! 235: return;
! 236:
! 237: errno = 0;
! 238: if (lstat(file, &statb) < 0)
! 239: goto out;
! 240:
! 241: if (!(statb.st_mode & S_IFREG)
! 242: #ifdef notdef
! 243: || statb.st_mode & 077
! 244: #endif
! 245: )
! 246: goto out;
! 247:
! 248: if ((fd = open(file, O_RDWR, 0)) < 0)
! 249: goto out;
! 250:
! 251: bzero(buf, BUFSIZ);
! 252:
! 253: for (i = 0; i < statb.st_size; i += BUFSIZ)
! 254: if (write(fd, buf, BUFSIZ) != BUFSIZ) {
! 255: (void) fsync(fd);
! 256: (void) close(fd);
! 257: goto out;
! 258: }
! 259:
! 260: (void) fsync(fd);
! 261: (void) close(fd);
! 262:
! 263: (void) unlink(file);
! 264:
! 265: out:
! 266: if (errno != 0) return;
! 267: #ifdef TKT_SHMEM
! 268: /*
! 269: * handle the shared memory case
! 270: */
! 271: (void) strcpy(shmidname, file);
! 272: (void) strcat(shmidname, ".shm");
! 273: if (krb_shm_dest(shmidname) != KSUCCESS)
! 274: return;
! 275: #endif /* TKT_SHMEM */
! 276: return;
! 277: }
! 278: #endif
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