Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.43
1.43 ! djm 1: /* $OpenBSD: auth-rh-rsa.c,v 1.42 2006/08/03 03:34:41 deraadt Exp $ */
1.1 provos 2: /*
1.9 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Rhosts or /etc/hosts.equiv authentication combined with RSA host
7: * authentication.
8: *
1.15 deraadt 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".
1.9 deraadt 14: */
1.1 provos 15:
1.41 stevesk 16: #include <sys/types.h>
17:
18: #include <pwd.h>
1.42 deraadt 19: #include <stdarg.h>
1.1 provos 20:
21: #include "packet.h"
22: #include "uidswap.h"
1.21 markus 23: #include "log.h"
1.42 deraadt 24: #include "buffer.h"
1.4 markus 25: #include "servconf.h"
1.11 markus 26: #include "key.h"
27: #include "hostfile.h"
1.20 markus 28: #include "pathnames.h"
1.21 markus 29: #include "auth.h"
30: #include "canohost.h"
1.42 deraadt 31: #ifdef GSSAPI
32: #include "ssh-gss.h"
33: #endif
1.32 provos 34: #include "monitor_wrap.h"
35:
1.31 markus 36: /* import */
37: extern ServerOptions options;
1.1 provos 38:
1.13 markus 39: int
1.31 markus 40: auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
41: Key *client_host_key)
1.1 provos 42: {
1.8 markus 43: HostStatus host_status;
1.43 ! djm 44:
! 45: if (auth_key_is_revoked(client_host_key))
! 46: return 0;
1.8 markus 47:
1.31 markus 48: /* Check if we would accept it using rhosts authentication. */
49: if (!auth_rhosts(pw, cuser))
50: return 0;
1.8 markus 51:
1.31 markus 52: host_status = check_key_in_hostfiles(pw, client_host_key,
53: chost, _PATH_SSH_SYSTEM_HOSTFILE,
54: options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
55:
1.33 markus 56: return (host_status == HOST_OK);
1.31 markus 57: }
1.11 markus 58:
1.31 markus 59: /*
60: * Tries to authenticate the user using the .rhosts file and the host using
61: * its host key. Returns true if authentication succeeds.
62: */
63: int
1.37 djm 64: auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
1.31 markus 65: {
66: char *chost;
1.37 djm 67: struct passwd *pw = authctxt->pw;
1.8 markus 68:
1.31 markus 69: debug("Trying rhosts with RSA host authentication for client user %.100s",
70: cuser);
1.8 markus 71:
1.37 djm 72: if (!authctxt->valid || client_host_key == NULL ||
1.31 markus 73: client_host_key->rsa == NULL)
74: return 0;
1.11 markus 75:
1.36 markus 76: chost = (char *)get_canonical_hostname(options.use_dns);
1.31 markus 77: debug("Rhosts RSA authentication: canonical host %.900s", chost);
1.24 markus 78:
1.32 provos 79: if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
1.8 markus 80: debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
81: packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
82: return 0;
83: }
84: /* A matching host key was found and is known. */
85:
86: /* Perform the challenge-response dialog with the client for the host key. */
1.30 markus 87: if (!auth_rsa_challenge_dialog(client_host_key)) {
1.35 itojun 88: logit("Client on %.800s failed to respond correctly to host authentication.",
1.31 markus 89: chost);
1.8 markus 90: return 0;
91: }
1.10 markus 92: /*
93: * We have authenticated the user using .rhosts or /etc/hosts.equiv,
94: * and the host using RSA. We accept the authentication.
95: */
1.8 markus 96:
97: verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.38 djm 98: pw->pw_name, cuser, chost);
1.8 markus 99: packet_send_debug("Rhosts with RSA host authentication accepted.");
100: return 1;
1.1 provos 101: }