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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Rhosts or /etc/hosts.equiv authentication combined with RSA host | |
6 | * authentication. | |
7 | * | |
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". | |
13 | */ | |
14 | ||
15 | #include "includes.h" | |
16 | RCSID("$OpenBSD: auth-rh-rsa.c,v 1.37 2003/11/04 08:54:09 djm Exp $"); | |
17 | ||
18 | #include "packet.h" | |
19 | #include "uidswap.h" | |
20 | #include "log.h" | |
21 | #include "servconf.h" | |
22 | #include "key.h" | |
23 | #include "hostfile.h" | |
24 | #include "pathnames.h" | |
25 | #include "auth.h" | |
26 | #include "canohost.h" | |
27 | ||
28 | #include "monitor_wrap.h" | |
29 | ||
30 | /* import */ | |
31 | extern ServerOptions options; | |
32 | ||
33 | int | |
34 | auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost, | |
35 | Key *client_host_key) | |
36 | { | |
37 | HostStatus host_status; | |
38 | ||
39 | /* Check if we would accept it using rhosts authentication. */ | |
40 | if (!auth_rhosts(pw, cuser)) | |
41 | return 0; | |
42 | ||
43 | host_status = check_key_in_hostfiles(pw, client_host_key, | |
44 | chost, _PATH_SSH_SYSTEM_HOSTFILE, | |
45 | options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE); | |
46 | ||
47 | return (host_status == HOST_OK); | |
48 | } | |
49 | ||
50 | /* | |
51 | * Tries to authenticate the user using the .rhosts file and the host using | |
52 | * its host key. Returns true if authentication succeeds. | |
53 | */ | |
54 | int | |
55 | auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key) | |
56 | { | |
57 | char *chost; | |
58 | struct passwd *pw = authctxt->pw; | |
59 | ||
60 | debug("Trying rhosts with RSA host authentication for client user %.100s", | |
61 | cuser); | |
62 | ||
63 | if (!authctxt->valid || client_host_key == NULL || | |
64 | client_host_key->rsa == NULL) | |
65 | return 0; | |
66 | ||
67 | chost = (char *)get_canonical_hostname(options.use_dns); | |
68 | debug("Rhosts RSA authentication: canonical host %.900s", chost); | |
69 | ||
70 | if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) { | |
71 | debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); | |
72 | packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); | |
73 | return 0; | |
74 | } | |
75 | /* A matching host key was found and is known. */ | |
76 | ||
77 | /* Perform the challenge-response dialog with the client for the host key. */ | |
78 | if (!auth_rsa_challenge_dialog(client_host_key)) { | |
79 | logit("Client on %.800s failed to respond correctly to host authentication.", | |
80 | chost); | |
81 | return 0; | |
82 | } | |
83 | /* | |
84 | * We have authenticated the user using .rhosts or /etc/hosts.equiv, | |
85 | * and the host using RSA. We accept the authentication. | |
86 | */ | |
87 | ||
88 | verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", | |
89 | pw->pw_name, cuser, chost); | |
90 | packet_send_debug("Rhosts with RSA host authentication accepted."); | |
91 | return 1; | |
92 | } |