From 95def09838fc61b37b6ea7cd5c234a465b4b129b Mon Sep 17 00:00:00 2001 From: Damien Miller Date: Thu, 25 Nov 1999 00:26:21 +1100 Subject: - Merged very large OpenBSD source code reformat - OpenBSD CVS updates - [channels.c cipher.c compat.c log-client.c scp.c serverloop.c] [ssh.h sshd.8 sshd.c] syslog changes: * Unified Logmessage for all auth-types, for success and for failed * Standard connections get only ONE line in the LOG when level==LOG: Auth-attempts are logged only, if authentication is: a) successfull or b) with passwd or c) we had more than AUTH_FAIL_LOG failues * many log() became verbose() * old behaviour with level=VERBOSE - [readconf.c readconf.h ssh.1 ssh.h sshconnect.c sshd.c] tranfer s/key challenge/response data in SSH_SMSG_AUTH_TIS_CHALLENGE messages. allows use of s/key in windows (ttssh, securecrt) and ssh-1.2.27 clients without 'ssh -v', ok: niels@ - [sshd.8] -V, for fallback to openssh in SSH2 compatibility mode - [sshd.c] fix sigchld race; cjc5@po.cwru.edu --- auth-rh-rsa.c | 174 +++++++++++++++++++++++++++++----------------------------- 1 file changed, 86 insertions(+), 88 deletions(-) (limited to 'auth-rh-rsa.c') diff --git a/auth-rh-rsa.c b/auth-rh-rsa.c index 68e0b829..4e9a383a 100644 --- a/auth-rh-rsa.c +++ b/auth-rh-rsa.c @@ -1,21 +1,21 @@ /* - -auth-rh-rsa.c - -Author: Tatu Ylonen - -Copyright (c) 1995 Tatu Ylonen , 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. - -*/ + * + * auth-rh-rsa.c + * + * Author: Tatu Ylonen + * + * Copyright (c) 1995 Tatu Ylonen , 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 1.5 1999/11/16 02:37:16 damien Exp $"); +RCSID("$Id: auth-rh-rsa.c,v 1.6 1999/11/24 13:26:21 damien Exp $"); #include "packet.h" #include "ssh.h" @@ -26,78 +26,76 @@ RCSID("$Id: auth-rh-rsa.c,v 1.5 1999/11/16 02:37:16 damien Exp $"); /* Tries to authenticate the user using the .rhosts file and the host using its host key. Returns true if authentication succeeds. */ -int auth_rhosts_rsa(struct passwd *pw, const char *client_user, - BIGNUM *client_host_key_e, BIGNUM *client_host_key_n) +int +auth_rhosts_rsa(struct passwd *pw, const char *client_user, + BIGNUM *client_host_key_e, BIGNUM *client_host_key_n) { - extern ServerOptions options; - 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)) - 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_e, client_host_key_n, ke, kn); - - /* Check user host file unless ignored. */ - if (host_status != HOST_OK && !options.ignore_user_known_hosts) { - struct stat st; - char *user_hostfile = tilde_expand_filename(SSH_USER_HOSTFILE, pw->pw_uid); - /* Check file permissions of SSH_USER_HOSTFILE, - auth_rsa() did already check pw->pw_dir, but there is a race XXX */ - if (options.strict_modes && - (stat(user_hostfile, &st) == 0) && - ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || - (st.st_mode & 022) != 0)) { - log("Rhosts RSA authentication refused for %.100s: bad owner or modes for %.200s", - pw->pw_name, user_hostfile); - } else { - /* XXX race between stat and the following open() */ - temporarily_use_uid(pw->pw_uid); - host_status = check_host_in_hostfile(user_hostfile, canonical_hostname, - client_host_key_e, client_host_key_n, ke, kn); - restore_uid(); - } - xfree(user_hostfile); - } - 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_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; + extern ServerOptions options; + 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)) + 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. */ + ke = BN_new(); + kn = BN_new(); + host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname, + client_host_key_e, client_host_key_n, + ke, kn); + + /* Check user host file unless ignored. */ + if (host_status != HOST_OK && !options.ignore_user_known_hosts) { + struct stat st; + char *user_hostfile = tilde_expand_filename(SSH_USER_HOSTFILE, pw->pw_uid); + /* Check file permissions of SSH_USER_HOSTFILE, auth_rsa() + did already check pw->pw_dir, but there is a race XXX */ + if (options.strict_modes && + (stat(user_hostfile, &st) == 0) && + ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || + (st.st_mode & 022) != 0)) { + log("Rhosts RSA authentication refused for %.100s: bad owner or modes for %.200s", + pw->pw_name, user_hostfile); + } else { + /* XXX race between stat and the following open() */ + temporarily_use_uid(pw->pw_uid); + host_status = check_host_in_hostfile(user_hostfile, canonical_hostname, + client_host_key_e, client_host_key_n, + ke, kn); + restore_uid(); + } + xfree(user_hostfile); + } + BN_free(ke); + BN_free(kn); + + if (host_status != HOST_OK) { + 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_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. */ + + verbose("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; } -- cgit v1.2.3