Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.30
1.1 provos 1: /*
1.9 deraadt 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: *
1.15 deraadt 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".
1.9 deraadt 13: */
1.1 provos 14:
15: #include "includes.h"
1.30 ! markus 16: RCSID("$OpenBSD: auth-rh-rsa.c,v 1.29 2002/03/04 12:43:06 markus Exp $");
1.1 provos 17:
18: #include "packet.h"
19: #include "uidswap.h"
1.21 markus 20: #include "log.h"
1.4 markus 21: #include "servconf.h"
1.11 markus 22: #include "key.h"
23: #include "hostfile.h"
1.20 markus 24: #include "pathnames.h"
1.21 markus 25: #include "auth.h"
26: #include "canohost.h"
1.11 markus 27:
1.10 markus 28: /*
29: * Tries to authenticate the user using the .rhosts file and the host using
30: * its host key. Returns true if authentication succeeds.
31: */
1.1 provos 32:
1.13 markus 33: int
1.27 markus 34: auth_rhosts_rsa(struct passwd *pw, const char *client_user, Key *client_host_key)
1.1 provos 35: {
1.8 markus 36: extern ServerOptions options;
37: const char *canonical_hostname;
38: HostStatus host_status;
39:
1.17 markus 40: debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
1.8 markus 41:
1.27 markus 42: if (pw == NULL || client_host_key == NULL || client_host_key->rsa == NULL)
1.11 markus 43: return 0;
44:
1.8 markus 45: /* Check if we would accept it using rhosts authentication. */
46: if (!auth_rhosts(pw, client_user))
47: return 0;
48:
1.22 markus 49: canonical_hostname = get_canonical_hostname(
1.28 markus 50: options.verify_reverse_mapping);
1.8 markus 51:
1.11 markus 52: debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
53:
1.27 markus 54: host_status = check_key_in_hostfiles(pw, client_host_key,
55: canonical_hostname, _PATH_SSH_SYSTEM_HOSTFILE,
1.25 markus 56: options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
1.24 markus 57:
1.8 markus 58: if (host_status != HOST_OK) {
59: debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
60: packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
61: return 0;
62: }
63: /* A matching host key was found and is known. */
64:
65: /* Perform the challenge-response dialog with the client for the host key. */
1.30 ! markus 66: if (!auth_rsa_challenge_dialog(client_host_key)) {
1.8 markus 67: log("Client on %.800s failed to respond correctly to host authentication.",
68: canonical_hostname);
69: return 0;
70: }
1.10 markus 71: /*
72: * We have authenticated the user using .rhosts or /etc/hosts.equiv,
73: * and the host using RSA. We accept the authentication.
74: */
1.8 markus 75:
76: verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.11 markus 77: pw->pw_name, client_user, canonical_hostname);
1.8 markus 78: packet_send_debug("Rhosts with RSA host authentication accepted.");
79: return 1;
1.1 provos 80: }