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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" | |
1853d1ef | 16 | RCSID("$OpenBSD: auth-rh-rsa.c,v 1.32 2002/03/18 17:50:31 provos Exp $"); |
8efc0c15 | 17 | |
18 | #include "packet.h" | |
8efc0c15 | 19 | #include "uidswap.h" |
42f11eb2 | 20 | #include "log.h" |
b4748e2f | 21 | #include "servconf.h" |
4fe2af09 | 22 | #include "key.h" |
23 | #include "hostfile.h" | |
42f11eb2 | 24 | #include "pathnames.h" |
25 | #include "auth.h" | |
42f11eb2 | 26 | #include "canohost.h" |
4fe2af09 | 27 | |
1853d1ef | 28 | #include "monitor_wrap.h" |
29 | ||
3e65880e | 30 | /* import */ |
31 | extern ServerOptions options; | |
32 | ||
aa3378df | 33 | /* |
34 | * Tries to authenticate the user using the .rhosts file and the host using | |
35 | * its host key. Returns true if authentication succeeds. | |
36 | */ | |
8efc0c15 | 37 | |
6ae2364d | 38 | int |
3e65880e | 39 | auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost, |
40 | Key *client_host_key) | |
8efc0c15 | 41 | { |
5260325f | 42 | HostStatus host_status; |
5260325f | 43 | |
5260325f | 44 | /* Check if we would accept it using rhosts authentication. */ |
3e65880e | 45 | if (!auth_rhosts(pw, cuser)) |
5260325f | 46 | return 0; |
47 | ||
dc421aa3 | 48 | host_status = check_key_in_hostfiles(pw, client_host_key, |
3e65880e | 49 | chost, _PATH_SSH_SYSTEM_HOSTFILE, |
73473230 | 50 | options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE); |
5260325f | 51 | |
3e65880e | 52 | return (host_status == HOST_OK); |
53 | } | |
54 | ||
55 | /* | |
56 | * Tries to authenticate the user using the .rhosts file and the host using | |
57 | * its host key. Returns true if authentication succeeds. | |
58 | */ | |
59 | int | |
60 | auth_rhosts_rsa(struct passwd *pw, char *cuser, Key *client_host_key) | |
61 | { | |
62 | char *chost; | |
63 | ||
64 | debug("Trying rhosts with RSA host authentication for client user %.100s", | |
65 | cuser); | |
66 | ||
67 | if (pw == NULL || client_host_key == NULL || | |
68 | client_host_key->rsa == NULL) | |
69 | return 0; | |
70 | ||
71 | chost = (char *)get_canonical_hostname(options.verify_reverse_mapping); | |
72 | debug("Rhosts RSA authentication: canonical host %.900s", chost); | |
73 | ||
1853d1ef | 74 | if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) { |
5260325f | 75 | debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); |
76 | packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); | |
77 | return 0; | |
78 | } | |
79 | /* A matching host key was found and is known. */ | |
80 | ||
81 | /* Perform the challenge-response dialog with the client for the host key. */ | |
46f1eece | 82 | if (!auth_rsa_challenge_dialog(client_host_key)) { |
5260325f | 83 | log("Client on %.800s failed to respond correctly to host authentication.", |
3e65880e | 84 | chost); |
5260325f | 85 | return 0; |
86 | } | |
aa3378df | 87 | /* |
88 | * We have authenticated the user using .rhosts or /etc/hosts.equiv, | |
89 | * and the host using RSA. We accept the authentication. | |
90 | */ | |
5260325f | 91 | |
92 | verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", | |
3e65880e | 93 | pw->pw_name, cuser, chost); |
5260325f | 94 | packet_send_debug("Rhosts with RSA host authentication accepted."); |
95 | return 1; | |
8efc0c15 | 96 | } |