1 /* passwd.c --- verifying typed passwords with the OS.
2 * xscreensaver, Copyright (c) 1993-2003 Jamie Zawinski <jwz@jwz.org>
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation. No representations are made about the suitability of this
9 * software for any purpose. It is provided "as is" without express or
17 #ifndef NO_LOCKING /* whole file */
25 extern char *blurb(void);
26 extern void check_for_leaks (const char *where);
38 #define countof(x) (sizeof((x))/sizeof(*(x)))
42 Bool (*init) (int argc, char **argv, Bool verbose_p);
43 Bool (*priv_init) (int argc, char **argv, Bool verbose_p);
44 Bool (*valid_p) (const char *typed_passwd, Bool verbose_p);
51 extern Bool kerberos_lock_init (int argc, char **argv, Bool verbose_p);
52 extern Bool kerberos_passwd_valid_p (const char *typed_passwd, Bool verbose_p);
55 extern Bool pam_priv_init (int argc, char **argv, Bool verbose_p);
56 extern Bool pam_passwd_valid_p (const char *typed_passwd, Bool verbose_p);
58 #ifdef PASSWD_HELPER_PROGRAM
59 extern Bool ext_priv_init (int argc, char **argv, Bool verbose_p);
60 extern Bool ext_passwd_valid_p (const char *typed_passwd, Bool verbose_p);
62 extern Bool pwent_lock_init (int argc, char **argv, Bool verbose_p);
63 extern Bool pwent_priv_init (int argc, char **argv, Bool verbose_p);
64 extern Bool pwent_passwd_valid_p (const char *typed_passwd, Bool verbose_p);
67 /* The authorization methods to try, in order.
68 Note that the last one (the pwent version) is actually two auth methods,
69 since that code tries shadow passwords, and then non-shadow passwords.
70 (It's all in the same file since the APIs are randomly nearly-identical.)
72 struct auth_methods methods[] = {
74 { "Kerberos", kerberos_lock_init, 0, kerberos_passwd_valid_p,
78 { "PAM", 0, pam_priv_init, pam_passwd_valid_p,
81 # ifdef PASSWD_HELPER_PROGRAM
82 { "external", 0, ext_priv_init, ext_passwd_valid_p,
85 { "normal", pwent_lock_init, pwent_priv_init, pwent_passwd_valid_p,
91 lock_priv_init (int argc, char **argv, Bool verbose_p)
95 for (i = 0; i < countof(methods); i++)
97 if (!methods[i].priv_init)
98 methods[i].priv_initted_p = True;
100 methods[i].priv_initted_p = methods[i].priv_init (argc, argv,
103 if (methods[i].priv_initted_p)
106 fprintf (stderr, "%s: initialization of %s passwords failed.\n",
107 blurb(), methods[i].name);
114 lock_init (int argc, char **argv, Bool verbose_p)
118 for (i = 0; i < countof(methods); i++)
120 if (!methods[i].priv_initted_p) /* Bail if lock_priv_init failed. */
123 if (!methods[i].init)
124 methods[i].initted_p = True;
126 methods[i].initted_p = methods[i].init (argc, argv, verbose_p);
128 if (methods[i].initted_p)
131 fprintf (stderr, "%s: initialization of %s passwords failed.\n",
132 blurb(), methods[i].name);
139 passwd_valid_p (const char *typed_passwd, Bool verbose_p)
142 for (i = 0; i < countof(methods); i++)
144 int ok_p = (methods[i].initted_p &&
145 methods[i].valid_p (typed_passwd, verbose_p));
147 check_for_leaks (methods[i].name);
151 /* If we successfully authenticated by method N, but attempting
152 to authenticate by method N-1 failed, mention that (since if
153 an earlier authentication method fails and a later one succeeds,
154 something screwy is probably going on.)
156 if (verbose_p && i > 0)
158 for (j = 0; j < i; j++)
159 if (methods[j].initted_p)
161 "%s: authentication via %s passwords failed.\n",
162 blurb(), methods[j].name);
164 "%s: authentication via %s passwords succeeded.\n",
165 blurb(), methods[i].name);
168 return True; /* Successfully authenticated! */
172 return False; /* Authentication failure. */
175 #endif /* NO_LOCKING -- whole file */