Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.26
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"
1.26 ! markus 16: RCSID("$OpenBSD: auth-rh-rsa.c,v 1.25 2001/06/23 03:04:42 markus Exp $");
1.1 provos 17:
18: #include "packet.h"
19: #include "xmalloc.h"
20: #include "uidswap.h"
1.21 markus 21: #include "log.h"
1.4 markus 22: #include "servconf.h"
1.11 markus 23: #include "key.h"
24: #include "hostfile.h"
1.20 markus 25: #include "pathnames.h"
1.21 markus 26: #include "auth.h"
27: #include "canohost.h"
1.11 markus 28:
1.10 markus 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: */
1.1 provos 33:
1.13 markus 34: int
1.11 markus 35: auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key)
1.1 provos 36: {
1.8 markus 37: extern ServerOptions options;
38: const char *canonical_hostname;
39: HostStatus host_status;
1.24 markus 40: Key *client_key;
1.8 markus 41:
1.17 markus 42: debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
1.8 markus 43:
1.17 markus 44: if (pw == NULL || client_host_key == NULL)
1.11 markus 45: return 0;
46:
1.8 markus 47: /* Check if we would accept it using rhosts authentication. */
48: if (!auth_rhosts(pw, client_user))
49: return 0;
50:
1.22 markus 51: canonical_hostname = get_canonical_hostname(
52: options.reverse_mapping_check);
1.8 markus 53:
1.11 markus 54: debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
55:
56: /* wrap the RSA key into a 'generic' key */
1.18 markus 57: client_key = key_new(KEY_RSA1);
1.11 markus 58: BN_copy(client_key->rsa->e, client_host_key->e);
59: BN_copy(client_key->rsa->n, client_host_key->n);
1.8 markus 60:
1.24 markus 61: host_status = check_key_in_hostfiles(pw, client_key, canonical_hostname,
62: _PATH_SSH_SYSTEM_HOSTFILE,
1.25 markus 63: options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
1.24 markus 64:
1.11 markus 65: key_free(client_key);
1.8 markus 66:
67: if (host_status != HOST_OK) {
68: debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
69: packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
70: return 0;
71: }
72: /* A matching host key was found and is known. */
73:
74: /* Perform the challenge-response dialog with the client for the host key. */
1.11 markus 75: if (!auth_rsa_challenge_dialog(client_host_key)) {
1.8 markus 76: log("Client on %.800s failed to respond correctly to host authentication.",
77: canonical_hostname);
78: return 0;
79: }
1.10 markus 80: /*
81: * We have authenticated the user using .rhosts or /etc/hosts.equiv,
82: * and the host using RSA. We accept the authentication.
83: */
1.8 markus 84:
85: verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.11 markus 86: pw->pw_name, client_user, canonical_hostname);
1.8 markus 87: packet_send_debug("Rhosts with RSA host authentication accepted.");
88: return 1;
1.1 provos 89: }