| | 1 | /* $OpenBSD: auth-rh-rsa.c,v 1.42 2006/08/03 03:34:41 deraadt Exp $ */ |
| | 2 | /* |
| | 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 | * |
| | 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". |
| | 14 | */ |
| | 15 | |
| | 16 | #include "includes.h" |
| | 17 | |
| | 18 | #include <sys/types.h> |
| | 19 | |
| | 20 | #include <pwd.h> |
| | 21 | #include <stdarg.h> |
| | 22 | |
| | 23 | #include "packet.h" |
| | 24 | #include "uidswap.h" |
| | 25 | #include "log.h" |
| | 26 | #include "buffer.h" |
| | 27 | #include "servconf.h" |
| | 28 | #include "key.h" |
| | 29 | #include "hostfile.h" |
| | 30 | #include "pathnames.h" |
| | 31 | #include "auth.h" |
| | 32 | #include "canohost.h" |
| | 33 | #ifdef GSSAPI |
| | 34 | #include "ssh-gss.h" |
| | 35 | #endif |
| | 36 | #include "monitor_wrap.h" |
| | 37 | |
| | 38 | /* import */ |
| | 39 | extern ServerOptions options; |
| | 40 | |
| | 41 | int |
| | 42 | auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost, |
| | 43 | Key *client_host_key) |
| | 44 | { |
| | 45 | HostStatus host_status; |
| | 46 | |
| | 47 | /* Check if we would accept it using rhosts authentication. */ |
| | 48 | if (!auth_rhosts(pw, cuser)) |
| | 49 | return 0; |
| | 50 | |
| | 51 | host_status = check_key_in_hostfiles(pw, client_host_key, |
| | 52 | chost, _PATH_SSH_SYSTEM_HOSTFILE, |
| | 53 | options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE); |
| | 54 | |
| | 55 | return (host_status == HOST_OK); |
| | 56 | } |
| | 57 | |
| | 58 | /* |
| | 59 | * Tries to authenticate the user using the .rhosts file and the host using |
| | 60 | * its host key. Returns true if authentication succeeds. |
| | 61 | */ |
| | 62 | int |
| | 63 | auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key) |
| | 64 | { |
| | 65 | char *chost; |
| | 66 | struct passwd *pw = authctxt->pw; |
| | 67 | |
| | 68 | debug("Trying rhosts with RSA host authentication for client user %.100s", |
| | 69 | cuser); |
| | 70 | |
| | 71 | if (!authctxt->valid || client_host_key == NULL || |
| | 72 | client_host_key->rsa == NULL) |
| | 73 | return 0; |
| | 74 | |
| | 75 | chost = (char *)get_canonical_hostname(options.use_dns); |
| | 76 | debug("Rhosts RSA authentication: canonical host %.900s", chost); |
| | 77 | |
| | 78 | if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) { |
| | 79 | debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); |
| | 80 | packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); |
| | 81 | return 0; |
| | 82 | } |
| | 83 | /* A matching host key was found and is known. */ |
| | 84 | |
| | 85 | /* Perform the challenge-response dialog with the client for the host key. */ |
| | 86 | if (!auth_rsa_challenge_dialog(client_host_key)) { |
| | 87 | logit("Client on %.800s failed to respond correctly to host authentication.", |
| | 88 | chost); |
| | 89 | return 0; |
| | 90 | } |
| | 91 | /* |
| | 92 | * We have authenticated the user using .rhosts or /etc/hosts.equiv, |
| | 93 | * and the host using RSA. We accept the authentication. |
| | 94 | */ |
| | 95 | |
| | 96 | verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", |
| | 97 | pw->pw_name, cuser, chost); |
| | 98 | packet_send_debug("Rhosts with RSA host authentication accepted."); |
| | 99 | return 1; |
| | 100 | } |
andersk / openssh.git / blame_incremental