diff options
author | Damien Miller <djm@mindrot.org> | 1999-10-27 13:42:43 +1000 |
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committer | Damien Miller <djm@mindrot.org> | 1999-10-27 13:42:43 +1000 |
commit | d4a8b7e34dd619a4debf9a206c81db26d1402ea6 (patch) | |
tree | a47d770a2f790f40d18b0982d4e55fa7cfb1fa3b /auth-rh-rsa.c |
Initial revision
Diffstat (limited to 'auth-rh-rsa.c')
-rw-r--r-- | auth-rh-rsa.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/auth-rh-rsa.c b/auth-rh-rsa.c new file mode 100644 index 00000000..c433578b --- /dev/null +++ b/auth-rh-rsa.c @@ -0,0 +1,83 @@ +/* + +auth-rh-rsa.c + +Author: Tatu Ylonen <ylo@cs.hut.fi> + +Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + All rights reserved + +Created: Sun May 7 03:08:06 1995 ylo + +Rhosts or /etc/hosts.equiv authentication combined with RSA host +authentication. + +*/ + +#include "includes.h" +RCSID("$Id: auth-rh-rsa.c,v 1.1 1999/10/27 03:42:43 damien Exp $"); + +#include "packet.h" +#include "ssh.h" +#include "xmalloc.h" +#include "uidswap.h" + +/* Tries to authenticate the user using the .rhosts file and the host using + its host key. Returns true if authentication succeeds. + .rhosts and .shosts will be ignored if ignore_rhosts is non-zero. */ + +int auth_rhosts_rsa(struct passwd *pw, const char *client_user, + unsigned int client_host_key_bits, + BIGNUM *client_host_key_e, BIGNUM *client_host_key_n, + int ignore_rhosts, int strict_modes) +{ + const char *canonical_hostname; + HostStatus host_status; + BIGNUM *ke, *kn; + + debug("Trying rhosts with RSA host authentication for %.100s", client_user); + + /* Check if we would accept it using rhosts authentication. */ + if (!auth_rhosts(pw, client_user, ignore_rhosts, strict_modes)) + return 0; + + canonical_hostname = get_canonical_hostname(); + + debug("Rhosts RSA authentication: canonical host %.900s", + canonical_hostname); + + /* Check if we know the host and its host key. */ + /* Check system-wide host file. */ + ke = BN_new(); + kn = BN_new(); + host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname, + client_host_key_bits, client_host_key_e, + client_host_key_n, ke, kn); + BN_free(ke); + BN_free(kn); + if (host_status != HOST_OK) { + /* The host key was not found. */ + debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); + packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); + return 0; + } + + /* A matching host key was found and is known. */ + + /* Perform the challenge-response dialog with the client for the host key. */ + if (!auth_rsa_challenge_dialog(client_host_key_bits, + client_host_key_e, client_host_key_n)) + { + log("Client on %.800s failed to respond correctly to host authentication.", + canonical_hostname); + return 0; + } + + /* We have authenticated the user using .rhosts or /etc/hosts.equiv, and + the host using RSA. We accept the authentication. */ + + log("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", + pw->pw_name, client_user, canonical_hostname); + packet_send_debug("Rhosts with RSA host authentication accepted."); + return 1; +} |