1/*
2 * Copyright (c) 1994-1996, 1998-2005, 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#if defined(HAVE_SKEY)
47# include <skey.h>
48# define RFC1938				skey
49#  ifdef HAVE_RFC1938_SKEYCHALLENGE
50#   define rfc1938challenge(a,b,c,d)	skeychallenge((a),(b),(c),(d))
51#  else
52#   define rfc1938challenge(a,b,c,d)	skeychallenge((a),(b),(c))
53#  endif
54# define rfc1938verify(a,b)		skeyverify((a),(b))
55#elif defined(HAVE_OPIE)
56# include <opie.h>
57# define RFC1938			opie
58# define rfc1938challenge(a,b,c,d)	opiechallenge((a),(b),(c))
59# define rfc1938verify(a,b)		opieverify((a),(b))
60#endif
61
62#include "sudo.h"
63#include "sudo_auth.h"
64
65int
66rfc1938_setup(pw, promptp, auth)
67    struct passwd *pw;
68    char **promptp;
69    sudo_auth *auth;
70{
71    char challenge[256];
72    static char *orig_prompt = NULL, *new_prompt = NULL;
73    static int op_len, np_size;
74    static struct RFC1938 rfc1938;
75
76    /* Stash a pointer to the rfc1938 struct if we have not initialized */
77    if (!auth->data)
78	auth->data = &rfc1938;
79
80    /* Save the original prompt */
81    if (orig_prompt == NULL) {
82	orig_prompt = *promptp;
83	op_len = strlen(orig_prompt);
84
85	/* Ignore trailing colon (we will add our own) */
86	if (orig_prompt[op_len - 1] == ':')
87	    op_len--;
88	else if (op_len >= 2 && orig_prompt[op_len - 1] == ' '
89	    && orig_prompt[op_len - 2] == ':')
90	    op_len -= 2;
91    }
92
93#ifdef HAVE_SKEY
94    /* Close old stream */
95    if (rfc1938.keyfile)
96	(void) fclose(rfc1938.keyfile);
97#endif
98
99    /*
100     * Look up the user and get the rfc1938 challenge.
101     * If the user is not in the OTP db, only post a fatal error if
102     * we are running alone (since they may just use a normal passwd).
103     */
104    if (rfc1938challenge(&rfc1938, pw->pw_name, challenge, sizeof(challenge))) {
105	if (IS_ONEANDONLY(auth)) {
106	    warningx("you do not exist in the %s database", auth->name);
107	    return AUTH_FATAL;
108	} else {
109	    return AUTH_FAILURE;
110	}
111    }
112
113    /* Get space for new prompt with embedded challenge */
114    if (np_size < op_len + strlen(challenge) + 7) {
115	np_size = op_len + strlen(challenge) + 7;
116	new_prompt = (char *) erealloc(new_prompt, np_size);
117    }
118
119    if (def_long_otp_prompt)
120	(void) snprintf(new_prompt, np_size, "%s\n%s", challenge, orig_prompt);
121    else
122	(void) snprintf(new_prompt, np_size, "%.*s [ %s ]:", op_len,
123	    orig_prompt, challenge);
124
125    *promptp = new_prompt;
126    return AUTH_SUCCESS;
127}
128
129int
130rfc1938_verify(pw, pass, auth)
131    struct passwd *pw;
132    char *pass;
133    sudo_auth *auth;
134{
135
136    if (rfc1938verify((struct RFC1938 *) auth->data, pass) == 0)
137	return AUTH_SUCCESS;
138    else
139	return AUTH_FAILURE;
140}
141