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1.1 root 1: /*-
2: * Copyright (c) 1990 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted provided
6: * that: (1) source distributions retain this entire copyright notice and
7: * comment, and (2) distributions including binaries display the following
8: * acknowledgement: ``This product includes software developed by the
9: * University of California, Berkeley and its contributors'' in the
10: * documentation or other materials provided with the distribution and in
11: * all advertising materials mentioning features or use of this software.
12: * Neither the name of the University nor the names of its contributors may
13: * be used to endorse or promote products derived from this software without
14: * specific prior written permission.
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
16: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
17: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18: */
19:
20: #ifndef lint
21: static char sccsid[] = "@(#)klogin.c 5.3 (Berkeley) 6/21/90";
22: #endif /* not lint */
23:
24: #ifdef KERBEROS
25: #include <sys/param.h>
26: #include <sys/syslog.h>
27: #include <kerberosIV/des.h>
28: #include <kerberosIV/krb.h>
29: #include <pwd.h>
30: #include <netdb.h>
31:
32: #define PRINCIPAL_NAME pw->pw_name
33: #define PRINCIPAL_INST ""
34: #define INITIAL_TICKET "krbtgt"
35: #define VERIFY_SERVICE "rcmd"
36:
37: extern int notickets;
38:
39: /*
40: * Attempt to log the user in using Kerberos authentication
41: *
42: * return 0 on success (will be logged in)
43: * 1 if Kerberos failed (try local password in login)
44: */
45:
46: klogin(pw, localhost, password)
47: struct passwd *pw;
48: char *localhost, *password;
49: {
50: int kerror;
51: AUTH_DAT authdata;
52: KTEXT_ST ticket;
53: struct hostent *hp;
54: unsigned long faddr;
55: char realm[REALM_SZ], savehost[MAXHOSTNAMELEN];
56: char tkt_location[MAXPATHLEN];
57:
58: /*
59: * If we aren't Kerberos-authenticated, try the normal pw file
60: * for a password. If that's ok, log the user in without issueing
61: * any tickets.
62: */
63: if (krb_get_lrealm(realm, 1) != KSUCCESS)
64: return(1);
65:
66: /*
67: * get TGT for local realm
68: * tickets are stored in a file determined by calling tkt_string()
69: */
70:
71: (void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid);
72: (void)krb_set_tkt_string(tkt_location);
73: (void)dest_tkt();
74:
75: kerror = krb_get_pw_in_tkt(PRINCIPAL_NAME, PRINCIPAL_INST,
76: realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password);
77: /*
78: * If we got a TGT, get a local "rcmd" ticket and check it so as to
79: * ensure that we are not talking to a bogus Kerberos server.
80: *
81: * There are 2 cases where we still allow a login:
82: * 1: the VERIFY_SERVICE doesn't exist in the KDC
83: * 2: local host has no srvtab, as (hopefully) indicated by a
84: * return value of RD_AP_UNDEC from krb_rd_req().
85: */
86: if (kerror != INTK_OK) {
87: dest_tkt();
88: if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN)
89: syslog(LOG_ERR, "Kerberos intkt error: %s",
90: krb_err_txt[kerror]);
91: return(1);
92: }
93:
94: if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0)
95: syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE);
96:
97: (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost));
98: savehost[sizeof(savehost)-1] = NULL;
99:
100: /*
101: * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host,
102: * still allow login with tickets, but log the error condition.
103: */
104:
105: kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33);
106: if (kerror == KDC_PR_UNKNOWN) {
107: syslog(LOG_NOTICE, "warning: TGT not verified (%s)",
108: krb_err_txt[kerror]);
109: notickets = 0;
110: return(0);
111: }
112:
113: if (kerror != KSUCCESS) {
114: (void)printf("unable to use TGT: (%s)\n", krb_err_txt[kerror]);
115: syslog(LOG_NOTICE, "unable to use TGT: (%s)",
116: krb_err_txt[kerror]);
117: dest_tkt();
118: return(1);
119: }
120:
121: if (!(hp = gethostbyname(localhost))) {
122: syslog(LOG_ERR, "couldn't get local host address");
123: dest_tkt();
124: return(1);
125: }
126:
127: bcopy((void *)hp->h_addr, (void *)&faddr, sizeof(faddr));
128:
129: kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr,
130: &authdata, "");
131:
132: if (kerror == KSUCCESS) {
133: notickets = 0;
134: return(0);
135: }
136:
137: /* undecipherable: probably didn't have a srvtab on the local host */
138: if (kerror = RD_AP_UNDEC) {
139: syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]);
140: dest_tkt();
141: return(1);
142: }
143: /* failed for some other reason */
144: (void)printf("unable to verify %s ticket: (%s)\n", VERIFY_SERVICE,
145: krb_err_txt[kerror]);
146: syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE,
147: krb_err_txt[kerror]);
148: dest_tkt();
149: return(1);
150: }
151: #endif
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