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7408b3e5 KF |
1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * %sccs.include.redist.c% | |
6 | */ | |
7 | ||
8 | #ifndef lint | |
2be8cd09 | 9 | static char sccsid[] = "@(#)klogin.c 5.3 (Berkeley) %G%"; |
7408b3e5 KF |
10 | #endif /* not lint */ |
11 | ||
12 | #ifdef KERBEROS | |
13 | #include <sys/param.h> | |
14 | #include <sys/syslog.h> | |
15 | #include <kerberosIV/des.h> | |
16 | #include <kerberosIV/krb.h> | |
17 | #include <pwd.h> | |
18 | #include <netdb.h> | |
19 | ||
20 | #define PRINCIPAL_NAME pw->pw_name | |
21 | #define PRINCIPAL_INST "" | |
22 | #define INITIAL_TICKET "krbtgt" | |
23 | #define VERIFY_SERVICE "rcmd" | |
24 | ||
25 | extern int notickets; | |
26 | ||
27 | /* | |
52b9ec26 KF |
28 | * Attempt to log the user in using Kerberos authentication |
29 | * | |
30 | * return 0 on success (will be logged in) | |
31 | * 1 if Kerberos failed (try local password in login) | |
7408b3e5 KF |
32 | */ |
33 | ||
52b9ec26 | 34 | klogin(pw, localhost, password) |
7408b3e5 | 35 | struct passwd *pw; |
52b9ec26 | 36 | char *localhost, *password; |
7408b3e5 KF |
37 | { |
38 | int kerror; | |
39 | AUTH_DAT authdata; | |
40 | KTEXT_ST ticket; | |
41 | struct hostent *hp; | |
42 | unsigned long faddr; | |
52b9ec26 KF |
43 | char realm[REALM_SZ], savehost[MAXHOSTNAMELEN]; |
44 | char tkt_location[MAXPATHLEN]; | |
7408b3e5 KF |
45 | |
46 | /* | |
47 | * If we aren't Kerberos-authenticated, try the normal pw file | |
48 | * for a password. If that's ok, log the user in without issueing | |
49 | * any tickets. | |
50 | */ | |
51 | if (krb_get_lrealm(realm, 1) != KSUCCESS) | |
52 | return(1); | |
53 | ||
54 | /* | |
52b9ec26 KF |
55 | * get TGT for local realm |
56 | * tickets are stored in a file determined by calling tkt_string() | |
7408b3e5 | 57 | */ |
52b9ec26 KF |
58 | |
59 | (void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid); | |
60 | (void)krb_set_tkt_string(tkt_location); | |
61 | (void)dest_tkt(); | |
62 | ||
63 | kerror = krb_get_pw_in_tkt(PRINCIPAL_NAME, PRINCIPAL_INST, | |
64 | realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password); | |
7408b3e5 KF |
65 | /* |
66 | * If we got a TGT, get a local "rcmd" ticket and check it so as to | |
67 | * ensure that we are not talking to a bogus Kerberos server. | |
68 | * | |
69 | * There are 2 cases where we still allow a login: | |
70 | * 1: the VERIFY_SERVICE doesn't exist in the KDC | |
71 | * 2: local host has no srvtab, as (hopefully) indicated by a | |
72 | * return value of RD_AP_UNDEC from krb_rd_req(). | |
73 | */ | |
74 | if (kerror != INTK_OK) { | |
52b9ec26 | 75 | dest_tkt(); |
7408b3e5 KF |
76 | if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) |
77 | syslog(LOG_ERR, "Kerberos intkt error: %s", | |
78 | krb_err_txt[kerror]); | |
52b9ec26 | 79 | return(1); |
7408b3e5 KF |
80 | } |
81 | ||
52b9ec26 KF |
82 | if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0) |
83 | syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE); | |
7408b3e5 KF |
84 | |
85 | (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost)); | |
86 | savehost[sizeof(savehost)-1] = NULL; | |
7408b3e5 KF |
87 | |
88 | /* | |
89 | * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host, | |
90 | * still allow login with tickets, but log the error condition. | |
91 | */ | |
52b9ec26 KF |
92 | |
93 | kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33); | |
7408b3e5 KF |
94 | if (kerror == KDC_PR_UNKNOWN) { |
95 | syslog(LOG_NOTICE, "warning: TGT not verified (%s)", | |
96 | krb_err_txt[kerror]); | |
97 | notickets = 0; | |
98 | return(0); | |
99 | } | |
100 | ||
101 | if (kerror != KSUCCESS) { | |
102 | (void)printf("unable to use TGT: (%s)\n", krb_err_txt[kerror]); | |
103 | syslog(LOG_NOTICE, "unable to use TGT: (%s)", | |
104 | krb_err_txt[kerror]); | |
105 | dest_tkt(); | |
52b9ec26 | 106 | return(1); |
7408b3e5 KF |
107 | } |
108 | ||
109 | if (!(hp = gethostbyname(localhost))) { | |
110 | syslog(LOG_ERR, "couldn't get local host address"); | |
52b9ec26 KF |
111 | dest_tkt(); |
112 | return(1); | |
7408b3e5 | 113 | } |
52b9ec26 | 114 | |
7408b3e5 KF |
115 | bcopy((void *)hp->h_addr, (void *)&faddr, sizeof(faddr)); |
116 | ||
117 | kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr, | |
118 | &authdata, ""); | |
52b9ec26 | 119 | |
7408b3e5 KF |
120 | if (kerror == KSUCCESS) { |
121 | notickets = 0; | |
122 | return(0); | |
123 | } | |
52b9ec26 KF |
124 | |
125 | /* undecipherable: probably didn't have a srvtab on the local host */ | |
7408b3e5 KF |
126 | if (kerror = RD_AP_UNDEC) { |
127 | syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]); | |
52b9ec26 KF |
128 | dest_tkt(); |
129 | return(1); | |
7408b3e5 | 130 | } |
52b9ec26 | 131 | /* failed for some other reason */ |
7408b3e5 KF |
132 | (void)printf("unable to verify %s ticket: (%s)\n", VERIFY_SERVICE, |
133 | krb_err_txt[kerror]); | |
134 | syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE, | |
135 | krb_err_txt[kerror]); | |
52b9ec26 KF |
136 | dest_tkt(); |
137 | return(1); | |
7408b3e5 KF |
138 | } |
139 | #endif |