1/*
2 * Copyright (c) 1999-2005, 2010
3 *	Todd C. Miller <Todd.Miller@courtesan.com>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 * Sponsored in part by the Defense Advanced Research Projects
18 * Agency (DARPA) and Air Force Research Laboratory, Air Force
19 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
20 */
21
22#include <config.h>
23
24#include <sys/types.h>
25#include <sys/param.h>
26#include <stdio.h>
27#ifdef STDC_HEADERS
28# include <stdlib.h>
29# include <stddef.h>
30#else
31# ifdef HAVE_STDLIB_H
32#  include <stdlib.h>
33# endif
34#endif /* STDC_HEADERS */
35#ifdef HAVE_STRING_H
36# include <string.h>
37#endif /* HAVE_STRING_H */
38#ifdef HAVE_STRINGS_H
39# include <strings.h>
40#endif /* HAVE_STRINGS_H */
41#ifdef HAVE_UNISTD_H
42# include <unistd.h>
43#endif /* HAVE_UNISTD_H */
44#include <pwd.h>
45
46#include "sudo.h"
47#include "sudo_auth.h"
48
49#define DESLEN			13
50#define HAS_AGEINFO(p, l)	(l == 18 && p[DESLEN] == ',')
51
52int
53passwd_init(pw, auth)
54    struct passwd *pw;
55    sudo_auth *auth;
56{
57#ifdef HAVE_SKEYACCESS
58    if (skeyaccess(pw, user_tty, NULL, NULL) == 0)
59	return AUTH_FAILURE;
60#endif
61    sudo_setspent();
62    auth->data = sudo_getepw(pw);
63    sudo_endspent();
64    return AUTH_SUCCESS;
65}
66
67int
68passwd_verify(pw, pass, auth)
69    struct passwd *pw;
70    char *pass;
71    sudo_auth *auth;
72{
73    char sav, *epass;
74    char *pw_epasswd = auth->data;
75    size_t pw_len;
76    int error;
77
78    pw_len = strlen(pw_epasswd);
79
80#ifdef HAVE_GETAUTHUID
81    /* Ultrix shadow passwords may use crypt16() */
82    error = strcmp(pw_epasswd, (char *) crypt16(pass, pw_epasswd));
83    if (!error)
84	return AUTH_SUCCESS;
85#endif /* HAVE_GETAUTHUID */
86
87    /*
88     * Truncate to 8 chars if standard DES since not all crypt()'s do this.
89     * If this turns out not to be safe we will have to use OS #ifdef's (sigh).
90     */
91    sav = pass[8];
92    if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len))
93	pass[8] = '\0';
94
95    /*
96     * Normal UN*X password check.
97     * HP-UX may add aging info (separated by a ',') at the end so
98     * only compare the first DESLEN characters in that case.
99     */
100    epass = (char *) crypt(pass, pw_epasswd);
101    pass[8] = sav;
102    if (HAS_AGEINFO(pw_epasswd, pw_len) && strlen(epass) == DESLEN)
103	error = strncmp(pw_epasswd, epass, DESLEN);
104    else
105	error = strcmp(pw_epasswd, epass);
106
107    return error ? AUTH_FAILURE : AUTH_SUCCESS;
108}
109
110int
111passwd_cleanup(pw, auth)
112    struct passwd *pw;
113    sudo_auth *auth;
114{
115    char *pw_epasswd = auth->data;
116
117    if (pw_epasswd != NULL) {
118	zero_bytes(pw_epasswd, strlen(pw_epasswd));
119	efree(pw_epasswd);
120    }
121    return AUTH_SUCCESS;
122}
123