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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" | |
dc421aa3 | 16 | RCSID("$OpenBSD: auth-rh-rsa.c,v 1.27 2001/12/27 19:54:53 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" | |
42f11eb2 | 27 | #include "canohost.h" |
4fe2af09 | 28 | |
aa3378df | 29 | /* |
30 | * Tries to authenticate the user using the .rhosts file and the host using | |
31 | * its host key. Returns true if authentication succeeds. | |
32 | */ | |
8efc0c15 | 33 | |
6ae2364d | 34 | int |
dc421aa3 | 35 | auth_rhosts_rsa(struct passwd *pw, const char *client_user, Key *client_host_key) |
8efc0c15 | 36 | { |
5260325f | 37 | extern ServerOptions options; |
38 | const char *canonical_hostname; | |
39 | HostStatus host_status; | |
5260325f | 40 | |
94ec8c6b | 41 | debug("Trying rhosts with RSA host authentication for client user %.100s", client_user); |
5260325f | 42 | |
dc421aa3 | 43 | if (pw == NULL || client_host_key == NULL || client_host_key->rsa == NULL) |
4fe2af09 | 44 | return 0; |
45 | ||
5260325f | 46 | /* Check if we would accept it using rhosts authentication. */ |
47 | if (!auth_rhosts(pw, client_user)) | |
48 | return 0; | |
49 | ||
61e96248 | 50 | canonical_hostname = get_canonical_hostname( |
51 | options.reverse_mapping_check); | |
5260325f | 52 | |
4fe2af09 | 53 | debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname); |
54 | ||
dc421aa3 | 55 | host_status = check_key_in_hostfiles(pw, client_host_key, |
56 | canonical_hostname, _PATH_SSH_SYSTEM_HOSTFILE, | |
73473230 | 57 | options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE); |
5260325f | 58 | |
5260325f | 59 | if (host_status != HOST_OK) { |
60 | debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); | |
61 | packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); | |
62 | return 0; | |
63 | } | |
64 | /* A matching host key was found and is known. */ | |
65 | ||
66 | /* Perform the challenge-response dialog with the client for the host key. */ | |
dc421aa3 | 67 | if (!auth_rsa_challenge_dialog(client_host_key->rsa)) { |
5260325f | 68 | log("Client on %.800s failed to respond correctly to host authentication.", |
69 | canonical_hostname); | |
70 | return 0; | |
71 | } | |
aa3378df | 72 | /* |
73 | * We have authenticated the user using .rhosts or /etc/hosts.equiv, | |
74 | * and the host using RSA. We accept the authentication. | |
75 | */ | |
5260325f | 76 | |
77 | verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", | |
4fe2af09 | 78 | pw->pw_name, client_user, canonical_hostname); |
5260325f | 79 | packet_send_debug("Rhosts with RSA host authentication accepted."); |
80 | return 1; | |
8efc0c15 | 81 | } |