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-rw-r--r--auth-rh-rsa.c174
1 files changed, 86 insertions, 88 deletions
diff --git a/auth-rh-rsa.c b/auth-rh-rsa.c
index 68e0b829e..4e9a383a2 100644
--- a/auth-rh-rsa.c
+++ b/auth-rh-rsa.c
@@ -1,21 +1,21 @@
1/* 1/*
2 2 *
3auth-rh-rsa.c 3 * auth-rh-rsa.c
4 4 *
5Author: Tatu Ylonen <ylo@cs.hut.fi> 5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6 6 *
7Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 All rights reserved 8 * All rights reserved
9 9 *
10Created: Sun May 7 03:08:06 1995 ylo 10 * Created: Sun May 7 03:08:06 1995 ylo
11 11 *
12Rhosts or /etc/hosts.equiv authentication combined with RSA host 12 * Rhosts or /etc/hosts.equiv authentication combined with RSA host
13authentication. 13 * authentication.
14 14 *
15*/ 15 */
16 16
17#include "includes.h" 17#include "includes.h"
18RCSID("$Id: auth-rh-rsa.c,v 1.5 1999/11/16 02:37:16 damien Exp $"); 18RCSID("$Id: auth-rh-rsa.c,v 1.6 1999/11/24 13:26:21 damien Exp $");
19 19
20#include "packet.h" 20#include "packet.h"
21#include "ssh.h" 21#include "ssh.h"
@@ -26,78 +26,76 @@ RCSID("$Id: auth-rh-rsa.c,v 1.5 1999/11/16 02:37:16 damien Exp $");
26/* Tries to authenticate the user using the .rhosts file and the host using 26/* Tries to authenticate the user using the .rhosts file and the host using
27 its host key. Returns true if authentication succeeds. */ 27 its host key. Returns true if authentication succeeds. */
28 28
29int auth_rhosts_rsa(struct passwd *pw, const char *client_user, 29int
30 BIGNUM *client_host_key_e, BIGNUM *client_host_key_n) 30auth_rhosts_rsa(struct passwd *pw, const char *client_user,
31 BIGNUM *client_host_key_e, BIGNUM *client_host_key_n)
31{ 32{
32 extern ServerOptions options; 33 extern ServerOptions options;
33 const char *canonical_hostname; 34 const char *canonical_hostname;
34 HostStatus host_status; 35 HostStatus host_status;
35 BIGNUM *ke, *kn; 36 BIGNUM *ke, *kn;
36 37
37 debug("Trying rhosts with RSA host authentication for %.100s", client_user); 38 debug("Trying rhosts with RSA host authentication for %.100s", client_user);
38 39
39 /* Check if we would accept it using rhosts authentication. */ 40 /* Check if we would accept it using rhosts authentication. */
40 if (!auth_rhosts(pw, client_user)) 41 if (!auth_rhosts(pw, client_user))
41 return 0; 42 return 0;
42 43
43 canonical_hostname = get_canonical_hostname(); 44 canonical_hostname = get_canonical_hostname();
44 45
45 debug("Rhosts RSA authentication: canonical host %.900s", 46 debug("Rhosts RSA authentication: canonical host %.900s",
46 canonical_hostname); 47 canonical_hostname);
47 48
48 /* Check if we know the host and its host key. */ 49 /* Check if we know the host and its host key. */
49 /* Check system-wide host file. */ 50 ke = BN_new();
50 ke = BN_new(); 51 kn = BN_new();
51 kn = BN_new(); 52 host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
52 host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname, 53 client_host_key_e, client_host_key_n,
53 client_host_key_e, client_host_key_n, ke, kn); 54 ke, kn);
54 55
55 /* Check user host file unless ignored. */ 56 /* Check user host file unless ignored. */
56 if (host_status != HOST_OK && !options.ignore_user_known_hosts) { 57 if (host_status != HOST_OK && !options.ignore_user_known_hosts) {
57 struct stat st; 58 struct stat st;
58 char *user_hostfile = tilde_expand_filename(SSH_USER_HOSTFILE, pw->pw_uid); 59 char *user_hostfile = tilde_expand_filename(SSH_USER_HOSTFILE, pw->pw_uid);
59 /* Check file permissions of SSH_USER_HOSTFILE, 60 /* Check file permissions of SSH_USER_HOSTFILE, auth_rsa()
60 auth_rsa() did already check pw->pw_dir, but there is a race XXX */ 61 did already check pw->pw_dir, but there is a race XXX */
61 if (options.strict_modes && 62 if (options.strict_modes &&
62 (stat(user_hostfile, &st) == 0) && 63 (stat(user_hostfile, &st) == 0) &&
63 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || 64 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
64 (st.st_mode & 022) != 0)) { 65 (st.st_mode & 022) != 0)) {
65 log("Rhosts RSA authentication refused for %.100s: bad owner or modes for %.200s", 66 log("Rhosts RSA authentication refused for %.100s: bad owner or modes for %.200s",
66 pw->pw_name, user_hostfile); 67 pw->pw_name, user_hostfile);
67 } else { 68 } else {
68 /* XXX race between stat and the following open() */ 69 /* XXX race between stat and the following open() */
69 temporarily_use_uid(pw->pw_uid); 70 temporarily_use_uid(pw->pw_uid);
70 host_status = check_host_in_hostfile(user_hostfile, canonical_hostname, 71 host_status = check_host_in_hostfile(user_hostfile, canonical_hostname,
71 client_host_key_e, client_host_key_n, ke, kn); 72 client_host_key_e, client_host_key_n,
72 restore_uid(); 73 ke, kn);
73 } 74 restore_uid();
74 xfree(user_hostfile); 75 }
75 } 76 xfree(user_hostfile);
76 BN_free(ke); 77 }
77 BN_free(kn); 78 BN_free(ke);
78 79 BN_free(kn);
79 if (host_status != HOST_OK) { 80
80 /* The host key was not found. */ 81 if (host_status != HOST_OK) {
81 debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); 82 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
82 packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); 83 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
83 return 0; 84 return 0;
84 } 85 }
85 86 /* A matching host key was found and is known. */
86 /* A matching host key was found and is known. */ 87
87 88 /* Perform the challenge-response dialog with the client for the host key. */
88 /* Perform the challenge-response dialog with the client for the host key. */ 89 if (!auth_rsa_challenge_dialog(client_host_key_e, client_host_key_n)) {
89 if (!auth_rsa_challenge_dialog(client_host_key_e, client_host_key_n)) 90 log("Client on %.800s failed to respond correctly to host authentication.",
90 { 91 canonical_hostname);
91 log("Client on %.800s failed to respond correctly to host authentication.", 92 return 0;
92 canonical_hostname); 93 }
93 return 0; 94 /* We have authenticated the user using .rhosts or /etc/hosts.equiv, and the host using RSA.
94 } 95 We accept the authentication. */
95 96
96 /* We have authenticated the user using .rhosts or /etc/hosts.equiv, and 97 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
97 the host using RSA. We accept the authentication. */ 98 pw->pw_name, client_user, canonical_hostname);
98 99 packet_send_debug("Rhosts with RSA host authentication accepted.");
99 log("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", 100 return 1;
100 pw->pw_name, client_user, canonical_hostname);
101 packet_send_debug("Rhosts with RSA host authentication accepted.");
102 return 1;
103} 101}
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