Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.37
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"
1.37 ! djm 16: RCSID("$OpenBSD: auth-rh-rsa.c,v 1.36 2003/06/02 09:17:34 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:
1.32 provos 28: #include "monitor_wrap.h"
29:
1.31 markus 30: /* import */
31: extern ServerOptions options;
1.1 provos 32:
1.13 markus 33: int
1.31 markus 34: auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
35: Key *client_host_key)
1.1 provos 36: {
1.8 markus 37: HostStatus host_status;
38:
1.31 markus 39: /* Check if we would accept it using rhosts authentication. */
40: if (!auth_rhosts(pw, cuser))
41: return 0;
1.8 markus 42:
1.31 markus 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:
1.33 markus 47: return (host_status == HOST_OK);
1.31 markus 48: }
1.11 markus 49:
1.31 markus 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
1.37 ! djm 55: auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
1.31 markus 56: {
57: char *chost;
1.37 ! djm 58: struct passwd *pw = authctxt->pw;
1.8 markus 59:
1.31 markus 60: debug("Trying rhosts with RSA host authentication for client user %.100s",
61: cuser);
1.8 markus 62:
1.37 ! djm 63: if (!authctxt->valid || client_host_key == NULL ||
1.31 markus 64: client_host_key->rsa == NULL)
65: return 0;
1.11 markus 66:
1.36 markus 67: chost = (char *)get_canonical_hostname(options.use_dns);
1.31 markus 68: debug("Rhosts RSA authentication: canonical host %.900s", chost);
1.24 markus 69:
1.32 provos 70: if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
1.8 markus 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. */
1.30 markus 78: if (!auth_rsa_challenge_dialog(client_host_key)) {
1.35 itojun 79: logit("Client on %.800s failed to respond correctly to host authentication.",
1.31 markus 80: chost);
1.8 markus 81: return 0;
82: }
1.10 markus 83: /*
84: * We have authenticated the user using .rhosts or /etc/hosts.equiv,
85: * and the host using RSA. We accept the authentication.
86: */
1.8 markus 87:
88: verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.31 markus 89: pw->pw_name, cuser, chost);
1.8 markus 90: packet_send_debug("Rhosts with RSA host authentication accepted.");
91: return 1;
1.1 provos 92: }