| | 1 | /* |
| | 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 | * |
| | 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". |
| | 13 | */ |
| | 14 | |
| | 15 | #include "includes.h" |
| | 16 | RCSID("$OpenBSD: auth-rh-rsa.c,v 1.25 2001/06/23 03:04:42 markus Exp $"); |
| | 17 | |
| | 18 | #include "packet.h" |
| | 19 | #include "xmalloc.h" |
| | 20 | #include "uidswap.h" |
| | 21 | #include "log.h" |
| | 22 | #include "servconf.h" |
| | 23 | #include "key.h" |
| | 24 | #include "hostfile.h" |
| | 25 | #include "pathnames.h" |
| | 26 | #include "auth.h" |
| | 27 | #include "tildexpand.h" |
| | 28 | #include "canohost.h" |
| | 29 | |
| | 30 | /* |
| | 31 | * Tries to authenticate the user using the .rhosts file and the host using |
| | 32 | * its host key. Returns true if authentication succeeds. |
| | 33 | */ |
| | 34 | |
| | 35 | int |
| | 36 | auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key) |
| | 37 | { |
| | 38 | extern ServerOptions options; |
| | 39 | const char *canonical_hostname; |
| | 40 | HostStatus host_status; |
| | 41 | Key *client_key; |
| | 42 | |
| | 43 | debug("Trying rhosts with RSA host authentication for client user %.100s", client_user); |
| | 44 | |
| | 45 | if (pw == NULL || client_host_key == NULL) |
| | 46 | return 0; |
| | 47 | |
| | 48 | /* Check if we would accept it using rhosts authentication. */ |
| | 49 | if (!auth_rhosts(pw, client_user)) |
| | 50 | return 0; |
| | 51 | |
| | 52 | canonical_hostname = get_canonical_hostname( |
| | 53 | options.reverse_mapping_check); |
| | 54 | |
| | 55 | debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname); |
| | 56 | |
| | 57 | /* wrap the RSA key into a 'generic' key */ |
| | 58 | client_key = key_new(KEY_RSA1); |
| | 59 | BN_copy(client_key->rsa->e, client_host_key->e); |
| | 60 | BN_copy(client_key->rsa->n, client_host_key->n); |
| | 61 | |
| | 62 | host_status = check_key_in_hostfiles(pw, client_key, canonical_hostname, |
| | 63 | _PATH_SSH_SYSTEM_HOSTFILE, |
| | 64 | options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE); |
| | 65 | |
| | 66 | key_free(client_key); |
| | 67 | |
| | 68 | if (host_status != HOST_OK) { |
| | 69 | debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); |
| | 70 | packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); |
| | 71 | return 0; |
| | 72 | } |
| | 73 | /* A matching host key was found and is known. */ |
| | 74 | |
| | 75 | /* Perform the challenge-response dialog with the client for the host key. */ |
| | 76 | if (!auth_rsa_challenge_dialog(client_host_key)) { |
| | 77 | log("Client on %.800s failed to respond correctly to host authentication.", |
| | 78 | canonical_hostname); |
| | 79 | return 0; |
| | 80 | } |
| | 81 | /* |
| | 82 | * We have authenticated the user using .rhosts or /etc/hosts.equiv, |
| | 83 | * and the host using RSA. We accept the authentication. |
| | 84 | */ |
| | 85 | |
| | 86 | verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", |
| | 87 | pw->pw_name, client_user, canonical_hostname); |
| | 88 | packet_send_debug("Rhosts with RSA host authentication accepted."); |
| | 89 | return 1; |
| | 90 | } |
andersk / openssh.git / blame_incremental