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7e8e820153
- [auth-rh-rsa.c auth-rsa.c authfd.c authfd.h hostfile.c mpaux.c]
[mpaux.h ssh-add.c ssh-agent.c ssh.h ssh.c sshd.c]
the keysize of rsa-parameter 'n' is passed implizit,
a few more checks and warnings about 'pretended' keysizes.
- [cipher.c cipher.h packet.c packet.h sshd.c]
remove support for cipher RC4
- [ssh.c]
a note for legay systems about secuity issues with permanently_set_uid(),
the private hostkey and ptrace()
- [sshconnect.c]
more detailed messages about adding and checking hostkeys
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/*
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auth-rh-rsa.c
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Author: Tatu Ylonen <ylo@cs.hut.fi>
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Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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All rights reserved
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Created: Sun May 7 03:08:06 1995 ylo
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Rhosts or /etc/hosts.equiv authentication combined with RSA host
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authentication.
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*/
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#include "includes.h"
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RCSID("$Id: auth-rh-rsa.c,v 1.5 1999/11/16 02:37:16 damien Exp $");
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#include "packet.h"
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#include "ssh.h"
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#include "xmalloc.h"
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#include "uidswap.h"
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#include "servconf.h"
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/* Tries to authenticate the user using the .rhosts file and the host using
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its host key. Returns true if authentication succeeds. */
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int auth_rhosts_rsa(struct passwd *pw, const char *client_user,
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BIGNUM *client_host_key_e, BIGNUM *client_host_key_n)
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{
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extern ServerOptions options;
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const char *canonical_hostname;
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HostStatus host_status;
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BIGNUM *ke, *kn;
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debug("Trying rhosts with RSA host authentication for %.100s", client_user);
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/* Check if we would accept it using rhosts authentication. */
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if (!auth_rhosts(pw, client_user))
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return 0;
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canonical_hostname = get_canonical_hostname();
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debug("Rhosts RSA authentication: canonical host %.900s",
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canonical_hostname);
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/* Check if we know the host and its host key. */
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/* Check system-wide host file. */
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ke = BN_new();
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kn = BN_new();
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host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
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client_host_key_e, client_host_key_n, ke, kn);
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/* Check user host file unless ignored. */
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if (host_status != HOST_OK && !options.ignore_user_known_hosts) {
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struct stat st;
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char *user_hostfile = tilde_expand_filename(SSH_USER_HOSTFILE, pw->pw_uid);
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/* Check file permissions of SSH_USER_HOSTFILE,
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auth_rsa() did already check pw->pw_dir, but there is a race XXX */
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if (options.strict_modes &&
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(stat(user_hostfile, &st) == 0) &&
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((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
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(st.st_mode & 022) != 0)) {
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log("Rhosts RSA authentication refused for %.100s: bad owner or modes for %.200s",
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pw->pw_name, user_hostfile);
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} else {
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/* XXX race between stat and the following open() */
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temporarily_use_uid(pw->pw_uid);
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host_status = check_host_in_hostfile(user_hostfile, canonical_hostname,
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client_host_key_e, client_host_key_n, ke, kn);
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restore_uid();
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}
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xfree(user_hostfile);
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}
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BN_free(ke);
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BN_free(kn);
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if (host_status != HOST_OK) {
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/* The host key was not found. */
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debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
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packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
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return 0;
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}
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/* A matching host key was found and is known. */
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/* Perform the challenge-response dialog with the client for the host key. */
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if (!auth_rsa_challenge_dialog(client_host_key_e, client_host_key_n))
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{
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log("Client on %.800s failed to respond correctly to host authentication.",
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canonical_hostname);
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return 0;
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}
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/* We have authenticated the user using .rhosts or /etc/hosts.equiv, and
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the host using RSA. We accept the authentication. */
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log("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
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pw->pw_name, client_user, canonical_hostname);
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packet_send_debug("Rhosts with RSA host authentication accepted.");
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return 1;
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}
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