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0082fba4ef
Remove support for pre-authentication compression. Doing compression early in the protocol probably seemed reasonable in the 1990s, but today it's clearly a bad idea in terms of both cryptography (cf. multiple compression oracle attacks in TLS) and attack surface. Moreover, to support it across privilege-separation zlib needed the assistance of a complex shared-memory manager that made the required attack surface considerably larger. Prompted by Guido Vranken pointing out a compiler-elided security check in the shared memory manager found by Stack (http://css.csail.mit.edu/stack/); ok deraadt@ markus@ NB. pre-auth authentication has been disabled by default in sshd for >10 years. Upstream-ID: 32af9771788d45a0779693b41d06ec199d849caf
99 lines
3.6 KiB
C
99 lines
3.6 KiB
C
/* $OpenBSD: monitor_wrap.h,v 1.32 2016/09/28 16:33:07 djm Exp $ */
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/*
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* Copyright 2002 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _MM_WRAP_H_
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#define _MM_WRAP_H_
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extern int use_privsep;
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#define PRIVSEP(x) (use_privsep ? mm_##x : x)
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enum mm_keytype { MM_NOKEY, MM_HOSTKEY, MM_USERKEY };
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struct monitor;
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struct mm_master;
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struct Authctxt;
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void mm_log_handler(LogLevel, const char *, void *);
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int mm_is_monitor(void);
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DH *mm_choose_dh(int, int, int);
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int mm_key_sign(Key *, u_char **, u_int *, const u_char *, u_int, const char *);
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void mm_inform_authserv(char *, char *);
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struct passwd *mm_getpwnamallow(const char *);
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char *mm_auth2_read_banner(void);
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int mm_auth_password(struct Authctxt *, char *);
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int mm_key_allowed(enum mm_keytype, const char *, const char *, Key *, int);
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int mm_user_key_allowed(struct passwd *, Key *, int);
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int mm_hostbased_key_allowed(struct passwd *, const char *,
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const char *, Key *);
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int mm_key_verify(Key *, u_char *, u_int, u_char *, u_int);
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#ifdef GSSAPI
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OM_uint32 mm_ssh_gssapi_server_ctx(Gssctxt **, gss_OID);
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OM_uint32 mm_ssh_gssapi_accept_ctx(Gssctxt *,
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gss_buffer_desc *, gss_buffer_desc *, OM_uint32 *);
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int mm_ssh_gssapi_userok(char *user);
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OM_uint32 mm_ssh_gssapi_checkmic(Gssctxt *, gss_buffer_t, gss_buffer_t);
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#endif
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#ifdef USE_PAM
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void mm_start_pam(struct Authctxt *);
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u_int mm_do_pam_account(void);
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void *mm_sshpam_init_ctx(struct Authctxt *);
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int mm_sshpam_query(void *, char **, char **, u_int *, char ***, u_int **);
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int mm_sshpam_respond(void *, u_int, char **);
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void mm_sshpam_free_ctx(void *);
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#endif
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#ifdef SSH_AUDIT_EVENTS
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#include "audit.h"
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void mm_audit_event(ssh_audit_event_t);
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void mm_audit_run_command(const char *);
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#endif
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struct Session;
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void mm_terminate(void);
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int mm_pty_allocate(int *, int *, char *, size_t);
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void mm_session_pty_cleanup2(struct Session *);
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/* Key export functions */
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struct newkeys *mm_newkeys_from_blob(u_char *, int);
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int mm_newkeys_to_blob(int, u_char **, u_int *);
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void monitor_apply_keystate(struct monitor *);
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void mm_get_keystate(struct monitor *);
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void mm_send_keystate(struct monitor*);
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/* bsdauth */
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int mm_bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
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int mm_bsdauth_respond(void *, u_int, char **);
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/* skey */
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int mm_skey_query(void *, char **, char **, u_int *, char ***, u_int **);
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int mm_skey_respond(void *, u_int, char **);
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#endif /* _MM_WRAP_H_ */
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