Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.31
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:
1.31 ! markus 28: /* import */
! 29: extern ServerOptions options;
! 30:
1.10 markus 31: /*
32: * Tries to authenticate the user using the .rhosts file and the host using
33: * its host key. Returns true if authentication succeeds.
34: */
1.1 provos 35:
1.13 markus 36: int
1.31 ! markus 37: auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
! 38: Key *client_host_key)
1.1 provos 39: {
1.8 markus 40: HostStatus host_status;
41:
1.31 ! markus 42: /* Check if we would accept it using rhosts authentication. */
! 43: if (!auth_rhosts(pw, cuser))
! 44: return 0;
1.8 markus 45:
1.31 ! markus 46: host_status = check_key_in_hostfiles(pw, client_host_key,
! 47: chost, _PATH_SSH_SYSTEM_HOSTFILE,
! 48: options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
! 49:
! 50: return (host_status == HOST_OK);
! 51: }
1.11 markus 52:
1.31 ! markus 53: /*
! 54: * Tries to authenticate the user using the .rhosts file and the host using
! 55: * its host key. Returns true if authentication succeeds.
! 56: */
! 57: int
! 58: auth_rhosts_rsa(struct passwd *pw, char *cuser, Key *client_host_key)
! 59: {
! 60: char *chost;
1.8 markus 61:
1.31 ! markus 62: debug("Trying rhosts with RSA host authentication for client user %.100s",
! 63: cuser);
1.8 markus 64:
1.31 ! markus 65: if (pw == NULL || client_host_key == NULL ||
! 66: client_host_key->rsa == NULL)
! 67: return 0;
1.11 markus 68:
1.31 ! markus 69: chost = (char *)get_canonical_hostname(options.verify_reverse_mapping);
! 70: debug("Rhosts RSA authentication: canonical host %.900s", chost);
1.24 markus 71:
1.31 ! markus 72: if (!auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key)) {
1.8 markus 73: debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
74: packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
75: return 0;
76: }
77: /* A matching host key was found and is known. */
78:
79: /* Perform the challenge-response dialog with the client for the host key. */
1.30 markus 80: if (!auth_rsa_challenge_dialog(client_host_key)) {
1.8 markus 81: log("Client on %.800s failed to respond correctly to host authentication.",
1.31 ! markus 82: chost);
1.8 markus 83: return 0;
84: }
1.10 markus 85: /*
86: * We have authenticated the user using .rhosts or /etc/hosts.equiv,
87: * and the host using RSA. We accept the authentication.
88: */
1.8 markus 89:
90: verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.31 ! markus 91: pw->pw_name, cuser, chost);
1.8 markus 92: packet_send_debug("Rhosts with RSA host authentication accepted.");
93: return 1;
1.1 provos 94: }