Annotation of src/usr.bin/login/k5login.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: k5login.c,v 1.2 1994/12/23 06:52:58 jtc Exp $ */
2:
3: /*-
4: * Copyright (c) 1990 The Regents of the University of California.
5: * 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 5.11 (Berkeley) 7/12/92";
39: #endif
40: static char rcsid[] = "$NetBSD: k5login.c,v 1.2 1994/12/23 06:52:58 jtc Exp $";
41: #endif /* not lint */
42:
43: #ifdef KERBEROS5
44: #include <sys/param.h>
45: #include <sys/syslog.h>
46: #include <com_err.h>
47: #include <krb5/krb5.h>
48: #include <krb5/ext-proto.h>
49: #include <krb5/los-proto.h>
50: #include <pwd.h>
51: #include <netdb.h>
52: #include <stdio.h>
53: #include <string.h>
54: #include <unistd.h>
55:
56: #define KRB5_DEFAULT_OPTIONS 0
57: #define KRB5_DEFAULT_LIFE 60*60*10 /* 10 hours */
58:
59: krb5_data tgtname = {
60: KRB5_TGS_NAME_SIZE,
61: KRB5_TGS_NAME
62: };
63:
64: /*
65: * Try no preauthentication first; then try the encrypted timestamp
66: */
67: int preauth_search_list[] = {
68: 0,
69: KRB5_PADATA_ENC_TIMESTAMP,
70: -1
71: };
72:
73: extern int notickets;
74: extern char *krbtkfile_env;
75: extern char *tty;
76:
77: static char tkt_location[MAXPATHLEN];
78:
79: /*
80: * Attempt to log the user in using Kerberos authentication
81: *
82: * return 0 on success (will be logged in)
83: * 1 if Kerberos failed (try local password in login)
84: */
85: int
86: klogin(pw, instance, localhost, password)
87: struct passwd *pw;
88: char *instance, *localhost, *password;
89: {
90: krb5_error_code kerror;
91: krb5_address **my_addresses;
92: krb5_principal me, server;
93: krb5_creds my_creds;
94: krb5_timestamp now;
95: krb5_ccache ccache = NULL;
96: int preauth_type = -1;
97: long lifetime = KRB5_DEFAULT_LIFE;
98: int options = KRB5_DEFAULT_OPTIONS;
99: int i;
100: char *realm, *client_name;
101: char *principal;
102:
103: #ifdef SKEY
104: /*
105: * We don't do s/key challenge and Kerberos at the same time
106: */
107: if (strcasecmp(password, "s/key") == 0) {
108: return (1);
109: }
110: #endif
111:
112: krb5_init_ets();
113:
114: /*
115: * Root logins don't use Kerberos.
116: * If we have a realm, try getting a ticket-granting ticket
117: * and using it to authenticate. Otherwise, return
118: * failure so that we can try the normal passwd file
119: * for a password. If that's ok, log the user in
120: * without issuing any tickets.
121: */
122: if (strcmp(pw->pw_name, "root") == 0 ||
123: krb5_get_default_realm(&realm))
124: return (1);
125:
126: /*
127: * get TGT for local realm
128: * tickets are stored in a file named TKT_ROOT plus uid
129: * except for user.root tickets.
130: */
131:
132: if (strcmp(instance, "root") != 0)
133: (void)sprintf(tkt_location, "FILE:/tmp/krb5cc_%d.%s",
134: pw->pw_uid, tty);
135: else
136: (void)sprintf(tkt_location, "FILE:/tmp/krb5cc_root_%d.%s",
137: pw->pw_uid, tty);
138: krbtkfile_env = tkt_location;
139:
140: principal = malloc(strlen(pw->pw_name)+strlen(instance)+2);
141: strcpy(principal, pw->pw_name);
142: if (strlen(instance)) {
143: strcat(principal, "/");
144: strcat(principal, instance);
145: }
146:
147: if (kerror = krb5_cc_resolve(tkt_location, &ccache)) {
148: syslog(LOG_NOTICE, "warning: %s while getting default ccache",
149: error_message(kerror));
150: return(1);
151: }
152:
153: if (kerror = krb5_parse_name(principal, &me)) {
154: syslog(LOG_NOTICE, "warning: %s when parsing name %s",
155: error_message(kerror), principal);
156: return(1);
157: }
158:
159: if (kerror = krb5_unparse_name(me, &client_name)) {
160: syslog(LOG_NOTICE, "warning: %s when unparsing name %s",
161: error_message(kerror), principal);
162: return(1);
163: }
164:
165: kerror = krb5_cc_initialize (ccache, me);
166: if (kerror != 0) {
167: syslog(LOG_NOTICE, "%s when initializing cache %s",
168: error_message(kerror), tkt_location);
169: return(1);
170: }
171:
172: memset((char *)&my_creds, 0, sizeof(my_creds));
173:
174: my_creds.client = me;
175:
176: if (kerror = krb5_build_principal_ext(&server,
177: krb5_princ_realm(me)->length,
178: krb5_princ_realm(me)->data,
179: tgtname.length, tgtname.data,
180: krb5_princ_realm(me)->length,
181: krb5_princ_realm(me)->data,
182: 0)) {
183: syslog(LOG_NOTICE, "%s while building server name",
184: error_message(kerror));
185: return(1);
186: }
187:
188: my_creds.server = server;
189:
190: kerror = krb5_os_localaddr(&my_addresses);
191: if (kerror != 0) {
192: syslog(LOG_NOTICE, "%s when getting my address",
193: error_message(kerror));
194: return(1);
195: }
196:
197: if (kerror = krb5_timeofday(&now)) {
198: syslog(LOG_NOTICE, "%s while getting time of day",
199: error_message(kerror));
200: return(1);
201: }
202: my_creds.times.starttime = 0; /* start timer when request
203: gets to KDC */
204: my_creds.times.endtime = now + lifetime;
205: my_creds.times.renew_till = 0;
206:
207: for (i=0; preauth_search_list[i] >= 0; i++) {
208: kerror = krb5_get_in_tkt_with_password(options, my_addresses,
209: preauth_search_list[i],
210: ETYPE_DES_CBC_CRC,
211: KEYTYPE_DES,
212: password,
213: ccache,
214: &my_creds, 0);
215: if (kerror != KRB5KDC_PREAUTH_FAILED &&
216: kerror != KRB5KRB_ERR_GENERIC)
217: break;
218: }
219:
220: krb5_free_principal(server);
221: krb5_free_addresses(my_addresses);
222:
223: if (chown(&tkt_location[5], pw->pw_uid, pw->pw_gid) < 0)
224: syslog(LOG_ERR, "chown tkfile (%s): %m", &tkt_location[5]);
225:
226: if (kerror) {
227: if (kerror == KRB5KRB_AP_ERR_BAD_INTEGRITY)
228: printf("%s: Kerberos Password incorrect\n", principal);
229: else
230: printf("%s while getting initial credentials\n", error_message(kerror));
231:
232: return(1);
233: }
234:
235: /* Success */
236: notickets = 0;
237: return(0);
238: }
239:
240: /*
241: * Remove any credentials
242: */
243: void
244: kdestroy()
245: {
246: krb5_error_code code;
247: krb5_ccache ccache = NULL;
248:
249: if (krbtkfile_env == NULL)
250: return;
251:
252: code = krb5_cc_resolve(krbtkfile_env, &ccache);
253: if (!code) {
254: code = krb5_cc_destroy(ccache);
255: if (!code) {
256: krb5_cc_close(ccache);
257: }
258: }
259: }
260: #endif
![[BACK]](/icons/back.gif){kind=icon}
Return to k5login.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / login