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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 | |
fa57fc2a | 9 | static char sccsid[] = "@(#)klogin.c 5.9 (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 | ||
7408b3e5 KF |
20 | #define INITIAL_TICKET "krbtgt" |
21 | #define VERIFY_SERVICE "rcmd" | |
22 | ||
23 | extern int notickets; | |
fa57fc2a | 24 | extern char *krbtkfile_env; |
7408b3e5 KF |
25 | |
26 | /* | |
52b9ec26 KF |
27 | * Attempt to log the user in using Kerberos authentication |
28 | * | |
29 | * return 0 on success (will be logged in) | |
30 | * 1 if Kerberos failed (try local password in login) | |
7408b3e5 KF |
31 | */ |
32 | ||
4e1d2cf3 | 33 | klogin(pw, instance, localhost, password) |
7408b3e5 | 34 | struct passwd *pw; |
4e1d2cf3 | 35 | char *instance, *localhost, *password; |
7408b3e5 KF |
36 | { |
37 | int kerror; | |
38 | AUTH_DAT authdata; | |
39 | KTEXT_ST ticket; | |
40 | struct hostent *hp; | |
41 | unsigned long faddr; | |
52b9ec26 KF |
42 | char realm[REALM_SZ], savehost[MAXHOSTNAMELEN]; |
43 | char tkt_location[MAXPATHLEN]; | |
7408b3e5 KF |
44 | |
45 | /* | |
4e1d2cf3 MK |
46 | * Root logins don't use Kerberos. |
47 | * If we have a realm, try getting a ticket-granting ticket | |
48 | * and using it to authenticate. Otherwise, return | |
49 | * failure so that we can try the normal passwd file | |
50 | * for a password. If that's ok, log the user in | |
51 | * without issuing any tickets. | |
7408b3e5 | 52 | */ |
4e1d2cf3 MK |
53 | if (strcmp(pw->pw_name, "root") == 0 || |
54 | krb_get_lrealm(realm, 0) != KSUCCESS) | |
55 | return (1); | |
7408b3e5 KF |
56 | |
57 | /* | |
52b9ec26 | 58 | * get TGT for local realm |
4e1d2cf3 | 59 | * tickets are stored in a file named TKT_ROOT plus uid |
fa57fc2a | 60 | * except for user.root tickets. |
7408b3e5 | 61 | */ |
52b9ec26 | 62 | |
fa57fc2a MK |
63 | if (strcmp(instance, "root") != 0) |
64 | (void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid); | |
65 | else { | |
66 | (void)sprintf(tkt_location, "%s_root_%d", TKT_ROOT, pw->pw_uid); | |
67 | krbtkfile_env = tkt_location; | |
68 | } | |
52b9ec26 | 69 | (void)krb_set_tkt_string(tkt_location); |
52b9ec26 | 70 | |
fa57fc2a MK |
71 | /* |
72 | * Set real as well as effective ID to 0 for the moment, | |
73 | * to make the kerberos library do the right thing. | |
74 | */ | |
75 | if (setuid(0) < 0) { | |
76 | perror("login: setuid"); | |
77 | return (1); | |
78 | } | |
4e1d2cf3 | 79 | kerror = krb_get_pw_in_tkt(pw->pw_name, instance, |
52b9ec26 | 80 | realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password); |
7408b3e5 KF |
81 | /* |
82 | * If we got a TGT, get a local "rcmd" ticket and check it so as to | |
83 | * ensure that we are not talking to a bogus Kerberos server. | |
84 | * | |
85 | * There are 2 cases where we still allow a login: | |
86 | * 1: the VERIFY_SERVICE doesn't exist in the KDC | |
87 | * 2: local host has no srvtab, as (hopefully) indicated by a | |
88 | * return value of RD_AP_UNDEC from krb_rd_req(). | |
89 | */ | |
90 | if (kerror != INTK_OK) { | |
4e1d2cf3 | 91 | if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) { |
7408b3e5 KF |
92 | syslog(LOG_ERR, "Kerberos intkt error: %s", |
93 | krb_err_txt[kerror]); | |
b4cc72c2 KF |
94 | dest_tkt(); |
95 | } | |
4e1d2cf3 | 96 | return (1); |
7408b3e5 KF |
97 | } |
98 | ||
52b9ec26 KF |
99 | if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0) |
100 | syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE); | |
7408b3e5 KF |
101 | |
102 | (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost)); | |
103 | savehost[sizeof(savehost)-1] = NULL; | |
7408b3e5 KF |
104 | |
105 | /* | |
106 | * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host, | |
107 | * still allow login with tickets, but log the error condition. | |
108 | */ | |
52b9ec26 KF |
109 | |
110 | kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33); | |
7408b3e5 | 111 | if (kerror == KDC_PR_UNKNOWN) { |
4e1d2cf3 MK |
112 | syslog(LOG_NOTICE, |
113 | "warning: TGT not verified (%s); %s.%s not registered, or srvtab is wrong?", | |
114 | krb_err_txt[kerror], VERIFY_SERVICE, savehost); | |
7408b3e5 KF |
115 | notickets = 0; |
116 | return(0); | |
117 | } | |
118 | ||
119 | if (kerror != KSUCCESS) { | |
120 | (void)printf("unable to use TGT: (%s)\n", krb_err_txt[kerror]); | |
121 | syslog(LOG_NOTICE, "unable to use TGT: (%s)", | |
122 | krb_err_txt[kerror]); | |
123 | dest_tkt(); | |
52b9ec26 | 124 | return(1); |
7408b3e5 KF |
125 | } |
126 | ||
127 | if (!(hp = gethostbyname(localhost))) { | |
128 | syslog(LOG_ERR, "couldn't get local host address"); | |
52b9ec26 KF |
129 | dest_tkt(); |
130 | return(1); | |
7408b3e5 | 131 | } |
52b9ec26 | 132 | |
7408b3e5 KF |
133 | bcopy((void *)hp->h_addr, (void *)&faddr, sizeof(faddr)); |
134 | ||
135 | kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr, | |
136 | &authdata, ""); | |
52b9ec26 | 137 | |
7408b3e5 KF |
138 | if (kerror == KSUCCESS) { |
139 | notickets = 0; | |
140 | return(0); | |
141 | } | |
52b9ec26 KF |
142 | |
143 | /* undecipherable: probably didn't have a srvtab on the local host */ | |
7408b3e5 KF |
144 | if (kerror = RD_AP_UNDEC) { |
145 | syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]); | |
52b9ec26 KF |
146 | dest_tkt(); |
147 | return(1); | |
7408b3e5 | 148 | } |
52b9ec26 | 149 | /* failed for some other reason */ |
7408b3e5 KF |
150 | (void)printf("unable to verify %s ticket: (%s)\n", VERIFY_SERVICE, |
151 | krb_err_txt[kerror]); | |
152 | syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE, | |
153 | krb_err_txt[kerror]); | |
52b9ec26 KF |
154 | dest_tkt(); |
155 | return(1); | |
7408b3e5 KF |
156 | } |
157 | #endif |