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31652869 | 1 | /* $OpenBSD: auth-rh-rsa.c,v 1.42 2006/08/03 03:34:41 deraadt Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * Rhosts or /etc/hosts.equiv authentication combined with RSA host |
7 | * authentication. | |
8 | * | |
bcbf86ec | 9 | * As far as I am concerned, the code I have written for this software |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
5260325f | 14 | */ |
8efc0c15 | 15 | |
16 | #include "includes.h" | |
8efc0c15 | 17 | |
b1842393 | 18 | #include <sys/types.h> |
19 | ||
20 | #include <pwd.h> | |
31652869 | 21 | #include <stdarg.h> |
b1842393 | 22 | |
8efc0c15 | 23 | #include "packet.h" |
8efc0c15 | 24 | #include "uidswap.h" |
42f11eb2 | 25 | #include "log.h" |
31652869 | 26 | #include "buffer.h" |
b4748e2f | 27 | #include "servconf.h" |
4fe2af09 | 28 | #include "key.h" |
29 | #include "hostfile.h" | |
42f11eb2 | 30 | #include "pathnames.h" |
31 | #include "auth.h" | |
42f11eb2 | 32 | #include "canohost.h" |
31652869 | 33 | #ifdef GSSAPI |
34 | #include "ssh-gss.h" | |
35 | #endif | |
1853d1ef | 36 | #include "monitor_wrap.h" |
37 | ||
3e65880e | 38 | /* import */ |
39 | extern ServerOptions options; | |
40 | ||
6ae2364d | 41 | int |
3e65880e | 42 | auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost, |
43 | Key *client_host_key) | |
8efc0c15 | 44 | { |
5260325f | 45 | HostStatus host_status; |
5260325f | 46 | |
5260325f | 47 | /* Check if we would accept it using rhosts authentication. */ |
3e65880e | 48 | if (!auth_rhosts(pw, cuser)) |
5260325f | 49 | return 0; |
50 | ||
dc421aa3 | 51 | host_status = check_key_in_hostfiles(pw, client_host_key, |
3e65880e | 52 | chost, _PATH_SSH_SYSTEM_HOSTFILE, |
73473230 | 53 | options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE); |
5260325f | 54 | |
762715ce | 55 | return (host_status == HOST_OK); |
3e65880e | 56 | } |
57 | ||
58 | /* | |
59 | * Tries to authenticate the user using the .rhosts file and the host using | |
60 | * its host key. Returns true if authentication succeeds. | |
61 | */ | |
62 | int | |
fdaef11e | 63 | auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key) |
3e65880e | 64 | { |
65 | char *chost; | |
fdaef11e | 66 | struct passwd *pw = authctxt->pw; |
3e65880e | 67 | |
68 | debug("Trying rhosts with RSA host authentication for client user %.100s", | |
69 | cuser); | |
70 | ||
fdaef11e | 71 | if (!authctxt->valid || client_host_key == NULL || |
3e65880e | 72 | client_host_key->rsa == NULL) |
73 | return 0; | |
74 | ||
c5a7d788 | 75 | chost = (char *)get_canonical_hostname(options.use_dns); |
3e65880e | 76 | debug("Rhosts RSA authentication: canonical host %.900s", chost); |
77 | ||
1853d1ef | 78 | if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) { |
5260325f | 79 | debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); |
80 | packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); | |
81 | return 0; | |
82 | } | |
83 | /* A matching host key was found and is known. */ | |
84 | ||
85 | /* Perform the challenge-response dialog with the client for the host key. */ | |
46f1eece | 86 | if (!auth_rsa_challenge_dialog(client_host_key)) { |
bbe88b6d | 87 | logit("Client on %.800s failed to respond correctly to host authentication.", |
3e65880e | 88 | chost); |
5260325f | 89 | return 0; |
90 | } | |
aa3378df | 91 | /* |
92 | * We have authenticated the user using .rhosts or /etc/hosts.equiv, | |
93 | * and the host using RSA. We accept the authentication. | |
94 | */ | |
5260325f | 95 | |
96 | verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", | |
4e2e5cfd | 97 | pw->pw_name, cuser, chost); |
5260325f | 98 | packet_send_debug("Rhosts with RSA host authentication accepted."); |
99 | return 1; | |
8efc0c15 | 100 | } |