1/*
2 *
3 * auth-rh-rsa.c
4 *
5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6 *
7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 * All rights reserved
9 *
10 * Created: Sun May 7 03:08:06 1995 ylo
11 *
12 * Rhosts or /etc/hosts.equiv authentication combined with RSA host
13 * authentication.
14 *
15 */
16
17#include "includes.h"
| 1/*
2 *
3 * auth-rh-rsa.c
4 *
5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6 *
7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 * All rights reserved
9 *
10 * Created: Sun May 7 03:08:06 1995 ylo
11 *
12 * Rhosts or /etc/hosts.equiv authentication combined with RSA host
13 * authentication.
14 *
15 */
16
17#include "includes.h"
|
18RCSID("$Id: auth-rh-rsa.c,v 1.10 1999/11/24 19:53:43 markus Exp $");
| 18RCSID("$Id: auth-rh-rsa.c,v 1.11 2000/03/23 22:15:33 markus Exp $");
|
19
20#include "packet.h"
21#include "ssh.h"
22#include "xmalloc.h"
23#include "uidswap.h"
24#include "servconf.h"
25
| 19
20#include "packet.h"
21#include "ssh.h"
22#include "xmalloc.h"
23#include "uidswap.h"
24#include "servconf.h"
25
|
| 26#include <ssl/rsa.h>
27#include <ssl/dsa.h>
28#include "key.h"
29#include "hostfile.h"
30
|
26/*
27 * Tries to authenticate the user using the .rhosts file and the host using
28 * its host key. Returns true if authentication succeeds.
29 */
30
31int
| 31/*
32 * Tries to authenticate the user using the .rhosts file and the host using
33 * its host key. Returns true if authentication succeeds.
34 */
35
36int
|
32auth_rhosts_rsa(struct passwd *pw, const char *client_user,
33 BIGNUM *client_host_key_e, BIGNUM *client_host_key_n)
| 37auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key)
|
34{
35 extern ServerOptions options;
36 const char *canonical_hostname;
37 HostStatus host_status;
| 38{
39 extern ServerOptions options;
40 const char *canonical_hostname;
41 HostStatus host_status;
|
38 BIGNUM *ke, *kn;
| 42 Key *client_key, *found;
|
39
40 debug("Trying rhosts with RSA host authentication for %.100s", client_user);
41
| 43
44 debug("Trying rhosts with RSA host authentication for %.100s", client_user);
45
|
| 46 if (client_host_key == NULL)
47 return 0;
48
|
42 /* Check if we would accept it using rhosts authentication. */
43 if (!auth_rhosts(pw, client_user))
44 return 0;
45
46 canonical_hostname = get_canonical_hostname();
47
| 49 /* Check if we would accept it using rhosts authentication. */
50 if (!auth_rhosts(pw, client_user))
51 return 0;
52
53 canonical_hostname = get_canonical_hostname();
54
|
48 debug("Rhosts RSA authentication: canonical host %.900s",
49 canonical_hostname);
| 55 debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
|
50
| 56
|
| 57 /* wrap the RSA key into a 'generic' key */
58 client_key = key_new(KEY_RSA);
59 BN_copy(client_key->rsa->e, client_host_key->e);
60 BN_copy(client_key->rsa->n, client_host_key->n);
61 found = key_new(KEY_RSA);
62
|
51 /* Check if we know the host and its host key. */
| 63 /* Check if we know the host and its host key. */
|
52 ke = BN_new();
53 kn = BN_new();
| |
54 host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
| 64 host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
|
55 client_host_key_e, client_host_key_n,
56 ke, kn);
| 65 client_key, found);
|
57
58 /* Check user host file unless ignored. */
59 if (host_status != HOST_OK && !options.ignore_user_known_hosts) {
60 struct stat st;
61 char *user_hostfile = tilde_expand_filename(SSH_USER_HOSTFILE, pw->pw_uid);
62 /*
63 * Check file permissions of SSH_USER_HOSTFILE, auth_rsa()
64 * did already check pw->pw_dir, but there is a race XXX
65 */
66 if (options.strict_modes &&
67 (stat(user_hostfile, &st) == 0) &&
68 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
69 (st.st_mode & 022) != 0)) {
70 log("Rhosts RSA authentication refused for %.100s: bad owner or modes for %.200s",
71 pw->pw_name, user_hostfile);
72 } else {
73 /* XXX race between stat and the following open() */
74 temporarily_use_uid(pw->pw_uid);
75 host_status = check_host_in_hostfile(user_hostfile, canonical_hostname,
| 66
67 /* Check user host file unless ignored. */
68 if (host_status != HOST_OK && !options.ignore_user_known_hosts) {
69 struct stat st;
70 char *user_hostfile = tilde_expand_filename(SSH_USER_HOSTFILE, pw->pw_uid);
71 /*
72 * Check file permissions of SSH_USER_HOSTFILE, auth_rsa()
73 * did already check pw->pw_dir, but there is a race XXX
74 */
75 if (options.strict_modes &&
76 (stat(user_hostfile, &st) == 0) &&
77 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
78 (st.st_mode & 022) != 0)) {
79 log("Rhosts RSA authentication refused for %.100s: bad owner or modes for %.200s",
80 pw->pw_name, user_hostfile);
81 } else {
82 /* XXX race between stat and the following open() */
83 temporarily_use_uid(pw->pw_uid);
84 host_status = check_host_in_hostfile(user_hostfile, canonical_hostname,
|
76 client_host_key_e, client_host_key_n,
77 ke, kn);
| 85 client_key, found);
|
78 restore_uid();
79 }
80 xfree(user_hostfile);
81 }
| 86 restore_uid();
87 }
88 xfree(user_hostfile);
89 }
|
82 BN_free(ke);
83 BN_free(kn);
| 90 key_free(client_key);
91 key_free(found);
|
84
85 if (host_status != HOST_OK) {
86 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
87 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
88 return 0;
89 }
90 /* A matching host key was found and is known. */
91
92 /* Perform the challenge-response dialog with the client for the host key. */
| 92
93 if (host_status != HOST_OK) {
94 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
95 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
96 return 0;
97 }
98 /* A matching host key was found and is known. */
99
100 /* Perform the challenge-response dialog with the client for the host key. */
|
93 if (!auth_rsa_challenge_dialog(client_host_key_e, client_host_key_n)) {
| 101 if (!auth_rsa_challenge_dialog(client_host_key)) {
|
94 log("Client on %.800s failed to respond correctly to host authentication.",
95 canonical_hostname);
96 return 0;
97 }
98 /*
99 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
100 * and the host using RSA. We accept the authentication.
101 */
102
103 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
| 102 log("Client on %.800s failed to respond correctly to host authentication.",
103 canonical_hostname);
104 return 0;
105 }
106 /*
107 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
108 * and the host using RSA. We accept the authentication.
109 */
110
111 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
|
104 pw->pw_name, client_user, canonical_hostname);
| 112 pw->pw_name, client_user, canonical_hostname);
|
105 packet_send_debug("Rhosts with RSA host authentication accepted.");
106 return 1;
107}
| 113 packet_send_debug("Rhosts with RSA host authentication accepted.");
114 return 1;
115}
|