Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.33
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"
1.33 ! markus 16: RCSID("$OpenBSD: auth-rh-rsa.c,v 1.32 2002/03/18 17:50:31 provos 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;
32:
1.10 markus 33: /*
34: * Tries to authenticate the user using the .rhosts file and the host using
35: * its host key. Returns true if authentication succeeds.
36: */
1.1 provos 37:
1.13 markus 38: int
1.31 markus 39: auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
40: Key *client_host_key)
1.1 provos 41: {
1.8 markus 42: HostStatus host_status;
43:
1.31 markus 44: /* Check if we would accept it using rhosts authentication. */
45: if (!auth_rhosts(pw, cuser))
46: return 0;
1.8 markus 47:
1.31 markus 48: host_status = check_key_in_hostfiles(pw, client_host_key,
49: chost, _PATH_SSH_SYSTEM_HOSTFILE,
50: options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
51:
1.33 ! markus 52: return (host_status == HOST_OK);
1.31 markus 53: }
1.11 markus 54:
1.31 markus 55: /*
56: * Tries to authenticate the user using the .rhosts file and the host using
57: * its host key. Returns true if authentication succeeds.
58: */
59: int
60: auth_rhosts_rsa(struct passwd *pw, char *cuser, Key *client_host_key)
61: {
62: char *chost;
1.8 markus 63:
1.31 markus 64: debug("Trying rhosts with RSA host authentication for client user %.100s",
65: cuser);
1.8 markus 66:
1.31 markus 67: if (pw == NULL || client_host_key == NULL ||
68: client_host_key->rsa == NULL)
69: return 0;
1.11 markus 70:
1.31 markus 71: chost = (char *)get_canonical_hostname(options.verify_reverse_mapping);
72: debug("Rhosts RSA authentication: canonical host %.900s", chost);
1.24 markus 73:
1.32 provos 74: if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
1.8 markus 75: debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
76: packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
77: return 0;
78: }
79: /* A matching host key was found and is known. */
80:
81: /* Perform the challenge-response dialog with the client for the host key. */
1.30 markus 82: if (!auth_rsa_challenge_dialog(client_host_key)) {
1.8 markus 83: log("Client on %.800s failed to respond correctly to host authentication.",
1.31 markus 84: chost);
1.8 markus 85: return 0;
86: }
1.10 markus 87: /*
88: * We have authenticated the user using .rhosts or /etc/hosts.equiv,
89: * and the host using RSA. We accept the authentication.
90: */
1.8 markus 91:
92: verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.31 markus 93: pw->pw_name, cuser, chost);
1.8 markus 94: packet_send_debug("Rhosts with RSA host authentication accepted.");
95: return 1;
1.1 provos 96: }