Annotation of src/usr.bin/login/klogin.c, Revision 1.6
1.6 ! art 1: /* $OpenBSD: klogin.c,v 1.5 1997/06/29 11:10:33 provos Exp $ */
1.2 deraadt 2: /* $NetBSD: klogin.c,v 1.7 1996/05/21 22:07:04 mrg Exp $ */
1.1 deraadt 3:
4: /*-
5: * Copyright (c) 1990, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
39: static char sccsid[] = "@(#)klogin.c 8.3 (Berkeley) 4/2/94";
40: #endif
1.6 ! art 41: static char rcsid[] = "$OpenBSD: klogin.c,v 1.5 1997/06/29 11:10:33 provos Exp $";
1.1 deraadt 42: #endif /* not lint */
43:
44: #ifdef KERBEROS
45: #include <sys/param.h>
46: #include <sys/syslog.h>
1.5 provos 47: #include <des.h>
1.1 deraadt 48: #include <kerberosIV/krb.h>
1.6 ! art 49: #include <kerberosIV/kafs.h>
1.1 deraadt 50:
51: #include <err.h>
52: #include <netdb.h>
53: #include <pwd.h>
54: #include <stdio.h>
55: #include <stdlib.h>
56: #include <string.h>
57: #include <unistd.h>
58:
59: #include <sys/types.h>
60: #include <sys/stat.h>
61: #include <fcntl.h>
62:
63: #define INITIAL_TICKET "krbtgt"
64: #define VERIFY_SERVICE "rcmd"
65:
66: extern int notickets;
67: extern char *krbtkfile_env;
68: extern char *tty;
69:
70: static char tkt_location[MAXPATHLEN]; /* a pointer to this is returned... */
71:
72: /*
73: * Attempt to log the user in using Kerberos authentication
74: *
75: * return 0 on success (will be logged in)
76: * 1 if Kerberos failed (try local password in login)
77: */
78: int
79: klogin(pw, instance, localhost, password)
80: struct passwd *pw;
81: char *instance, *localhost, *password;
82: {
83: int kerror;
84: AUTH_DAT authdata;
85: KTEXT_ST ticket;
86: struct hostent *hp;
87: unsigned long faddr;
88: char realm[REALM_SZ], savehost[MAXHOSTNAMELEN];
89: char *krb_get_phost();
90:
91: #ifdef SKEY
92: /*
93: * We don't do s/key challenge and Kerberos at the same time
94: */
95: if (strcasecmp(password, "s/key") == 0) {
96: return (1);
97: }
98: #endif
99:
100: /*
1.4 dm 101: * Root logins don't use Kerberos (or at least shouldn't be
102: * sending kerberos passwords around in cleartext), so don't
103: * allow any root logins here (keeping in mind that we only
104: * get here with a password).
105: *
1.1 deraadt 106: * If we have a realm, try getting a ticket-granting ticket
107: * and using it to authenticate. Otherwise, return
108: * failure so that we can try the normal passwd file
109: * for a password. If that's ok, log the user in
110: * without issuing any tickets.
111: */
1.4 dm 112: if (pw->pw_uid == 0 || krb_get_lrealm(realm, 0) != KSUCCESS)
1.1 deraadt 113: return (1);
114:
115: /*
116: * get TGT for local realm
117: * tickets are stored in a file named TKT_ROOT plus uid plus tty
118: * except for user.root tickets.
119: */
120:
121: if (strcmp(instance, "root") != 0)
122: (void)sprintf(tkt_location, "%s%d.%s",
123: TKT_ROOT, pw->pw_uid, tty);
124: else
125: (void)sprintf(tkt_location, "%s_root_%d.%s",
126: TKT_ROOT, pw->pw_uid, tty);
127: krbtkfile_env = tkt_location;
128: (void)krb_set_tkt_string(tkt_location);
129:
130: /*
131: * Set real as well as effective ID to 0 for the moment,
132: * to make the kerberos library do the right thing.
133: */
134: if (setuid(0) < 0) {
135: warnx("setuid");
136: return (1);
137: }
138: kerror = krb_get_pw_in_tkt(pw->pw_name, instance,
139: realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password);
140: /*
141: * If we got a TGT, get a local "rcmd" ticket and check it so as to
142: * ensure that we are not talking to a bogus Kerberos server.
143: *
144: * There are 2 cases where we still allow a login:
145: * 1: the VERIFY_SERVICE doesn't exist in the KDC
146: * 2: local host has no srvtab, as (hopefully) indicated by a
147: * return value of RD_AP_UNDEC from krb_rd_req().
148: */
149: if (kerror != INTK_OK) {
150: if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) {
151: syslog(LOG_ERR, "Kerberos intkt error: %s",
152: krb_err_txt[kerror]);
153: dest_tkt();
154: }
155: return (1);
156: }
157:
158: if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0)
159: syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE);
160:
161: (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost));
162: savehost[sizeof(savehost)-1] = NULL;
163:
164: /*
165: * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host,
166: * still allow login with tickets, but log the error condition.
167: */
168:
169: kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33);
170: if (kerror == KDC_PR_UNKNOWN) {
171: syslog(LOG_NOTICE,
172: "warning: TGT not verified (%s); %s.%s not registered, or srvtab is wrong?",
173: krb_err_txt[kerror], VERIFY_SERVICE, savehost);
174: notickets = 0;
175: /*
176: * but for security, don't allow root instances in under
177: * this condition!
178: */
179: if (strcmp(instance, "root") == 0) {
180: syslog(LOG_ERR, "Kerberos %s root instance login refused\n",
181: pw->pw_name);
182: dest_tkt();
183: return (1);
184: }
1.4 dm 185: /* Otherwise, leave ticket around, but make sure
186: * password matches the Unix password. */
187: return (1);
1.1 deraadt 188: }
189:
190: if (kerror != KSUCCESS) {
191: warnx("unable to use TGT: (%s)", krb_err_txt[kerror]);
192: syslog(LOG_NOTICE, "unable to use TGT: (%s)",
193: krb_err_txt[kerror]);
194: dest_tkt();
195: return (1);
196: }
197:
198: if (!(hp = gethostbyname(localhost))) {
199: syslog(LOG_ERR, "couldn't get local host address");
200: dest_tkt();
201: return (1);
202: }
203:
204: memmove((void *)&faddr, (void *)hp->h_addr, sizeof(faddr));
205:
206: kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr,
207: &authdata, "");
208:
209: if (kerror == KSUCCESS) {
210: notickets = 0;
211: return (0);
212: }
213:
214: /* undecipherable: probably didn't have a srvtab on the local host */
1.2 deraadt 215: if (kerror == RD_AP_UNDEC) {
1.1 deraadt 216: syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]);
217: dest_tkt();
218: return (1);
219: }
220: /* failed for some other reason */
221: warnx("unable to verify %s ticket: (%s)", VERIFY_SERVICE,
222: krb_err_txt[kerror]);
223: syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE,
224: krb_err_txt[kerror]);
225: dest_tkt();
226: return (1);
227: }
228:
229: void
1.6 ! art 230: kgettokens(homedir)
! 231: char *homedir;
! 232: {
! 233: /* buy AFS-tokens for homedir */
! 234: if (k_hasafs()) {
! 235: char cell[128];
! 236: k_setpag();
! 237: if (k_afs_cell_of_file(homedir,
! 238: cell, sizeof(cell)) == 0)
! 239: krb_afslog(cell, 0);
! 240: krb_afslog(0, 0);
! 241: }
! 242: }
! 243:
! 244: void
1.1 deraadt 245: kdestroy()
246: {
247: char *file = krbtkfile_env;
248: int i, fd;
249: extern int errno;
250: struct stat statb;
251: char buf[BUFSIZ];
252: #ifdef TKT_SHMEM
253: char shmidname[MAXPATHLEN];
254: #endif /* TKT_SHMEM */
1.6 ! art 255:
! 256: if (k_hasafs())
! 257: k_unlog();
1.1 deraadt 258:
259: if (krbtkfile_env == NULL)
260: return;
261:
262: errno = 0;
263: if (lstat(file, &statb) < 0)
264: goto out;
265:
266: if (!(statb.st_mode & S_IFREG)
267: #ifdef notdef
268: || statb.st_mode & 077
269: #endif
270: )
271: goto out;
272:
273: if ((fd = open(file, O_RDWR, 0)) < 0)
274: goto out;
275:
276: bzero(buf, BUFSIZ);
277:
278: for (i = 0; i < statb.st_size; i += BUFSIZ)
279: if (write(fd, buf, BUFSIZ) != BUFSIZ) {
280: (void) fsync(fd);
281: (void) close(fd);
282: goto out;
283: }
284:
285: (void) fsync(fd);
286: (void) close(fd);
287:
288: (void) unlink(file);
289:
290: out:
291: if (errno != 0) return;
292: #ifdef TKT_SHMEM
293: /*
294: * handle the shared memory case
295: */
296: (void) strcpy(shmidname, file);
297: (void) strcat(shmidname, ".shm");
298: if (krb_shm_dest(shmidname) != KSUCCESS)
299: return;
300: #endif /* TKT_SHMEM */
301: return;
302: }
303: #endif
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