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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
5260325f | 5 | * Rhosts or /etc/hosts.equiv authentication combined with RSA host |
6 | * authentication. | |
7 | * | |
bcbf86ec | 8 | * As far as I am concerned, the code I have written for this software |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
5260325f | 13 | */ |
8efc0c15 | 14 | |
15 | #include "includes.h" | |
d0c8ca5c | 16 | RCSID("$OpenBSD: auth-rh-rsa.c,v 1.24 2001/06/23 00:20:57 markus Exp $"); |
8efc0c15 | 17 | |
18 | #include "packet.h" | |
8efc0c15 | 19 | #include "xmalloc.h" |
20 | #include "uidswap.h" | |
42f11eb2 | 21 | #include "log.h" |
b4748e2f | 22 | #include "servconf.h" |
4fe2af09 | 23 | #include "key.h" |
24 | #include "hostfile.h" | |
42f11eb2 | 25 | #include "pathnames.h" |
26 | #include "auth.h" | |
27 | #include "tildexpand.h" | |
28 | #include "canohost.h" | |
4fe2af09 | 29 | |
aa3378df | 30 | /* |
31 | * Tries to authenticate the user using the .rhosts file and the host using | |
32 | * its host key. Returns true if authentication succeeds. | |
33 | */ | |
8efc0c15 | 34 | |
6ae2364d | 35 | int |
4fe2af09 | 36 | auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key) |
8efc0c15 | 37 | { |
5260325f | 38 | extern ServerOptions options; |
39 | const char *canonical_hostname; | |
40 | HostStatus host_status; | |
d0c8ca5c | 41 | Key *client_key; |
5260325f | 42 | |
94ec8c6b | 43 | debug("Trying rhosts with RSA host authentication for client user %.100s", client_user); |
5260325f | 44 | |
94ec8c6b | 45 | if (pw == NULL || client_host_key == NULL) |
4fe2af09 | 46 | return 0; |
47 | ||
5260325f | 48 | /* Check if we would accept it using rhosts authentication. */ |
49 | if (!auth_rhosts(pw, client_user)) | |
50 | return 0; | |
51 | ||
61e96248 | 52 | canonical_hostname = get_canonical_hostname( |
53 | options.reverse_mapping_check); | |
5260325f | 54 | |
4fe2af09 | 55 | debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname); |
56 | ||
57 | /* wrap the RSA key into a 'generic' key */ | |
fa08c86b | 58 | client_key = key_new(KEY_RSA1); |
4fe2af09 | 59 | BN_copy(client_key->rsa->e, client_host_key->e); |
60 | BN_copy(client_key->rsa->n, client_host_key->n); | |
5260325f | 61 | |
d0c8ca5c | 62 | host_status = check_key_in_hostfiles(pw, client_key, canonical_hostname, |
63 | _PATH_SSH_SYSTEM_HOSTFILE, | |
64 | options.ignore_user_known_hosts ? _PATH_SSH_USER_HOSTFILE : NULL); | |
5260325f | 65 | |
4fe2af09 | 66 | key_free(client_key); |
5260325f | 67 | |
68 | if (host_status != HOST_OK) { | |
69 | debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); | |
70 | packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); | |
71 | return 0; | |
72 | } | |
73 | /* A matching host key was found and is known. */ | |
74 | ||
75 | /* Perform the challenge-response dialog with the client for the host key. */ | |
4fe2af09 | 76 | if (!auth_rsa_challenge_dialog(client_host_key)) { |
5260325f | 77 | log("Client on %.800s failed to respond correctly to host authentication.", |
78 | canonical_hostname); | |
79 | return 0; | |
80 | } | |
aa3378df | 81 | /* |
82 | * We have authenticated the user using .rhosts or /etc/hosts.equiv, | |
83 | * and the host using RSA. We accept the authentication. | |
84 | */ | |
5260325f | 85 | |
86 | verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", | |
4fe2af09 | 87 | pw->pw_name, client_user, canonical_hostname); |
5260325f | 88 | packet_send_debug("Rhosts with RSA host authentication accepted."); |
89 | return 1; | |
8efc0c15 | 90 | } |