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openssh.9241
openssh-7.2p2-disable_preauth_compression.patch
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File openssh-7.2p2-disable_preauth_compression.patch of Package openssh.9241
# HG changeset patch # Parent 78110c09b1ae8a6079cca795e0554b0dfc6c427c Remove preauth compression support for security reasons and cleanup unused code. CVE-2016-10012 - part 1 bsc#1016370 backported upstream commit 0082fba4efdd492f765ed4c53f0d0fbd3bdbdf7f backported upstream commit 1cfd5c06efb121e58e8b6671548fda77ef4b4455 backported upstream commit 4577adead6a7d600c8e764619d99477a08192c8f backported upstream commit b7689155f3f5c4999846c07a852b1c7a43b09cec diff --git a/openssh-7.2p2/Makefile.in b/openssh-7.2p2/Makefile.in --- a/openssh-7.2p2/Makefile.in +++ b/openssh-7.2p2/Makefile.in @@ -111,17 +111,17 @@ SSHOBJS= ssh.o readconf.o clientloop.o s SSHDOBJS=sshd.o auth-rhosts.o auth-passwd.o auth-rsa.o auth-rh-rsa.o \ audit.o audit-bsm.o audit-linux.o platform.o \ sshpty.o sshlogin.o servconf.o serverloop.o \ auth.o auth1.o auth2.o auth-options.o session.o \ auth-chall.o auth2-chall.o groupaccess.o \ auth-skey.o auth-bsdauth.o auth2-hostbased.o auth2-kbdint.o \ auth2-none.o auth2-passwd.o auth2-pubkey.o \ - monitor_mm.o monitor.o monitor_wrap.o auth-krb5.o \ + monitor.o monitor_wrap.o auth-krb5.o \ auth2-gss.o gss-serv.o gss-serv-krb5.o \ loginrec.o auth-pam.o auth-shadow.o auth-sia.o md5crypt.o \ sftp-server.o sftp-common.o \ sandbox-null.o sandbox-rlimit.o sandbox-systrace.o sandbox-darwin.o \ sandbox-seccomp-filter.o sandbox-capsicum.o sandbox-pledge.o \ sandbox-solaris.o MANPAGES = moduli.5.out scp.1.out ssh-add.1.out ssh-agent.1.out ssh-keygen.1.out ssh-keyscan.1.out ssh.1.out sshd.8.out sftp-server.8.out sftp.1.out ssh-keysign.8.out ssh-pkcs11-helper.8.out sshd_config.5.out ssh_config.5.out ssh-ldap-helper.8.out ssh-ldap.conf.5.out diff --git a/openssh-7.2p2/README.privsep b/openssh-7.2p2/README.privsep --- a/openssh-7.2p2/README.privsep +++ b/openssh-7.2p2/README.privsep @@ -3,20 +3,16 @@ operations that require root privilege a privileged monitor process. Its purpose is to prevent privilege escalation by containing corruption to an unprivileged process. More information is available at: http://www.citi.umich.edu/u/provos/ssh/privsep.html Privilege separation is now enabled by default; see the UsePrivilegeSeparation option in sshd_config(5). -On systems which lack mmap or anonymous (MAP_ANON) memory mapping, -compression must be disabled in order for privilege separation to -function. - When privsep is enabled, during the pre-authentication phase sshd will chroot(2) to "/var/empty" and change its privileges to the "sshd" user and its primary group. sshd is a pseudo-account that should not be used by other daemons, and must be locked and should contain a "nologin" or invalid shell. You should do something like the following to prepare the privsep preauth environment: @@ -30,19 +26,16 @@ preauth environment: /var/empty should not contain any files. configure supports the following options to change the default privsep user and chroot directory: --with-privsep-path=xxx Path for privilege separation chroot --with-privsep-user=user Specify non-privileged user for privilege separation -Privsep requires operating system support for file descriptor passing. -Compression will be disabled on systems without a working mmap MAP_ANON. - PAM-enabled OpenSSH is known to function with privsep on AIX, FreeBSD, HP-UX (including Trusted Mode), Linux, NetBSD and Solaris. On Cygwin, Tru64 Unix, OpenServer, and Unicos only the pre-authentication part of privsep is supported. Post-authentication privsep is disabled automatically (so you won't see the additional process mentioned below). Note that for a normal interactive login with a shell, enabling privsep diff --git a/openssh-7.2p2/TODO b/openssh-7.2p2/TODO --- a/openssh-7.2p2/TODO +++ b/openssh-7.2p2/TODO @@ -64,20 +64,16 @@ Clean up configure/makefiles: similar tests. E.g move all the type detection stuff into one file, entropy related stuff into another. Packaging: - HP-UX: Provide DEPOT package scripts. (gilbert.r.loomis@saic.com) PrivSep Issues: -- mmap() issues. - + /dev/zero solution (Solaris) - + No/broken MAP_ANON (Irix) - + broken /dev/zero parse (Linux) - PAM + See above PAM notes - AIX + usrinfo() does not set TTY, but only required for legacy systems. Works with PrivSep. - OSF + SIA is broken - Cygwin diff --git a/openssh-7.2p2/configure.ac b/openssh-7.2p2/configure.ac --- a/openssh-7.2p2/configure.ac +++ b/openssh-7.2p2/configure.ac @@ -1176,17 +1176,16 @@ mips-sony-bsd|mips-sony-newsos4) *-*-nto-qnx6*) AC_DEFINE([DISABLE_FD_PASSING]) ;; esac ;; *-*-ultrix*) AC_DEFINE([BROKEN_GETGROUPS], [1], [getgroups(0,NULL) will return -1]) - AC_DEFINE([BROKEN_MMAP], [1], [Ultrix mmap can't map files]) AC_DEFINE([NEED_SETPGRP]) AC_DEFINE([HAVE_SYS_SYSLOG_H], [1], [Force use of sys/syslog.h on Ultrix]) ;; *-*-lynxos) CFLAGS="$CFLAGS -D__NO_INCLUDE_WARN__" AC_DEFINE([BROKEN_SETVBUF], [1], [LynxOS has broken setvbuf() implementation]) ;; @@ -1842,17 +1841,16 @@ AC_CHECK_FUNCS([ \ inet_ntop \ innetgr \ login_getcapbool \ mblen \ md5_crypt \ memmove \ memset_s \ mkdtemp \ - mmap \ ngetaddrinfo \ nsleep \ ogetaddrinfo \ openlog_r \ pledge \ poll \ prctl \ pstat \ diff --git a/openssh-7.2p2/monitor.c b/openssh-7.2p2/monitor.c --- a/openssh-7.2p2/monitor.c +++ b/openssh-7.2p2/monitor.c @@ -87,17 +87,16 @@ #include "channels.h" #include "session.h" #include "sshlogin.h" #include "canohost.h" #include "log.h" #include "misc.h" #include "servconf.h" #include "monitor.h" -#include "monitor_mm.h" #ifdef GSSAPI #include "ssh-gss.h" #endif #include "monitor_wrap.h" #include "monitor_fdpass.h" #include "compat.h" #include "ssh2.h" #include "authfd.h" @@ -511,41 +510,16 @@ monitor_child_postauth(struct monitor *p monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); } for (;;) monitor_read(pmonitor, mon_dispatch, NULL); } -void -monitor_sync(struct monitor *pmonitor) -{ - if (options.compression) { - /* The member allocation is not visible, so sync it */ - mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); - } -} - -/* Allocation functions for zlib */ -static void * -mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) -{ - if (size == 0 || ncount == 0 || ncount > SIZE_MAX / size) - fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); - - return mm_malloc(mm, size * ncount); -} - -static void -mm_zfree(struct mm_master *mm, void *address) -{ - mm_free(mm, address); -} - static int monitor_read_log(struct monitor *pmonitor) { Buffer logmsg; u_int len, level; char *msg; buffer_init(&logmsg); @@ -1965,23 +1939,16 @@ monitor_apply_keystate(struct monitor *p kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server; } #endif kex->load_host_public_key=&get_hostkey_public_by_type; kex->load_host_private_key=&get_hostkey_private_by_type; kex->host_key_index=&get_hostkey_index; kex->sign = sshd_hostkey_sign; } - - /* Update with new address */ - if (options.compression) { - ssh_packet_set_compress_hooks(ssh, pmonitor->m_zlib, - (ssh_packet_comp_alloc_func *)mm_zalloc, - (ssh_packet_comp_free_func *)mm_zfree); - } } /* This function requries careful sanity checking */ void mm_get_keystate(struct monitor *pmonitor) { Buffer m; @@ -2040,34 +2007,21 @@ monitor_openfds(struct monitor *mon, int mon->m_log_recvfd = mon->m_log_sendfd = -1; } #define MM_MEMSIZE 65536 struct monitor * monitor_init(void) { - struct ssh *ssh = active_state; /* XXX */ struct monitor *mon; mon = xcalloc(1, sizeof(*mon)); - monitor_openfds(mon, 1); - /* Used to share zlib space across processes */ - if (options.compression) { - mon->m_zback = mm_create(NULL, MM_MEMSIZE); - mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); - - /* Compression needs to share state across borders */ - ssh_packet_set_compress_hooks(ssh, mon->m_zlib, - (ssh_packet_comp_alloc_func *)mm_zalloc, - (ssh_packet_comp_free_func *)mm_zfree); - } - return mon; } void monitor_reinit(struct monitor *mon) { monitor_openfds(mon, 0); } diff --git a/openssh-7.2p2/monitor.h b/openssh-7.2p2/monitor.h --- a/openssh-7.2p2/monitor.h +++ b/openssh-7.2p2/monitor.h @@ -1,9 +1,9 @@ -/* $OpenBSD: monitor.h,v 1.19 2015/01/19 19:52:16 markus Exp $ */ +/* $OpenBSD: monitor.h,v 1.20 2016/09/28 16:33:07 djm Exp $ */ /* * Copyright 2002 Niels Provos <provos@citi.umich.edu> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: @@ -71,31 +71,27 @@ enum monitor_reqtype { MONITOR_REQ_AUDIT_SESSION_KEY_FREE = 122, MONITOR_ANS_AUDIT_SESSION_KEY_FREE = 123, MONITOR_REQ_AUDIT_SERVER_KEY_FREE = 124, MONITOR_REQ_GSSSIGN = 201, MONITOR_ANS_GSSSIGN = 202, MONITOR_REQ_GSSUPCREDS = 203, MONITOR_ANS_GSSUPCREDS = 204, }; -struct mm_master; struct monitor { int m_recvfd; int m_sendfd; int m_log_recvfd; int m_log_sendfd; - struct mm_master *m_zback; - struct mm_master *m_zlib; struct kex **m_pkex; pid_t m_pid; }; struct monitor *monitor_init(void); void monitor_reinit(struct monitor *); -void monitor_sync(struct monitor *); struct Authctxt; void monitor_child_preauth(struct Authctxt *, struct monitor *); void monitor_child_postauth(struct monitor *); struct mon_table; int monitor_read(struct monitor*, struct mon_table *, struct mon_table **); diff --git a/openssh-7.2p2/monitor_mm.c b/openssh-7.2p2/monitor_mm.c deleted file mode 100644 --- a/openssh-7.2p2/monitor_mm.c +++ /dev/null @@ -1,357 +0,0 @@ -/* $OpenBSD: monitor_mm.c,v 1.21 2015/02/06 23:21:59 millert Exp $ */ -/* - * Copyright 2002 Niels Provos <provos@citi.umich.edu> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "includes.h" - -#include <sys/types.h> -#ifdef HAVE_SYS_MMAN_H -#include <sys/mman.h> -#endif -#include "openbsd-compat/sys-tree.h" - -#include <errno.h> -#include <stdarg.h> -#include <stddef.h> -#ifdef HAVE_STDINT_H -#include <stdint.h> -#endif -#include <stdlib.h> -#include <string.h> - -#include "xmalloc.h" -#include "ssh.h" -#include "log.h" -#include "monitor_mm.h" - -static int -mm_compare(struct mm_share *a, struct mm_share *b) -{ - ptrdiff_t diff = (char *)a->address - (char *)b->address; - - if (diff == 0) - return (0); - else if (diff < 0) - return (-1); - else - return (1); -} - -RB_GENERATE(mmtree, mm_share, next, mm_compare) - -static struct mm_share * -mm_make_entry(struct mm_master *mm, struct mmtree *head, - void *address, size_t size) -{ - struct mm_share *tmp, *tmp2; - - if (mm->mmalloc == NULL) - tmp = xcalloc(1, sizeof(struct mm_share)); - else - tmp = mm_xmalloc(mm->mmalloc, sizeof(struct mm_share)); - tmp->address = address; - tmp->size = size; - - tmp2 = RB_INSERT(mmtree, head, tmp); - if (tmp2 != NULL) - fatal("mm_make_entry(%p): double address %p->%p(%zu)", - mm, tmp2, address, size); - - return (tmp); -} - -/* Creates a shared memory area of a certain size */ - -struct mm_master * -mm_create(struct mm_master *mmalloc, size_t size) -{ - void *address; - struct mm_master *mm; - - if (mmalloc == NULL) - mm = xcalloc(1, sizeof(struct mm_master)); - else - mm = mm_xmalloc(mmalloc, sizeof(struct mm_master)); - - /* - * If the memory map has a mm_master it can be completely - * shared including authentication between the child - * and the client. - */ - mm->mmalloc = mmalloc; - - address = xmmap(size); - if (address == (void *)MAP_FAILED) - fatal("mmap(%zu): %s", size, strerror(errno)); - - mm->address = address; - mm->size = size; - - RB_INIT(&mm->rb_free); - RB_INIT(&mm->rb_allocated); - - mm_make_entry(mm, &mm->rb_free, address, size); - - return (mm); -} - -/* Frees either the allocated or the free list */ - -static void -mm_freelist(struct mm_master *mmalloc, struct mmtree *head) -{ - struct mm_share *mms, *next; - - for (mms = RB_ROOT(head); mms; mms = next) { - next = RB_NEXT(mmtree, head, mms); - RB_REMOVE(mmtree, head, mms); - if (mmalloc == NULL) - free(mms); - else - mm_free(mmalloc, mms); - } -} - -/* Destroys a memory mapped area */ - -void -mm_destroy(struct mm_master *mm) -{ - mm_freelist(mm->mmalloc, &mm->rb_free); - mm_freelist(mm->mmalloc, &mm->rb_allocated); - -#ifdef HAVE_MMAP - if (munmap(mm->address, mm->size) == -1) - fatal("munmap(%p, %zu): %s", mm->address, mm->size, - strerror(errno)); -#else - fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported", - __func__); -#endif - if (mm->mmalloc == NULL) - free(mm); - else - mm_free(mm->mmalloc, mm); -} - -void * -mm_xmalloc(struct mm_master *mm, size_t size) -{ - void *address; - - address = mm_malloc(mm, size); - if (address == NULL) - fatal("%s: mm_malloc(%zu)", __func__, size); - memset(address, 0, size); - return (address); -} - - -/* Allocates data from a memory mapped area */ - -void * -mm_malloc(struct mm_master *mm, size_t size) -{ - struct mm_share *mms, *tmp; - - if (size == 0) - fatal("mm_malloc: try to allocate 0 space"); - if (size > SIZE_MAX - MM_MINSIZE + 1) - fatal("mm_malloc: size too big"); - - size = ((size + (MM_MINSIZE - 1)) / MM_MINSIZE) * MM_MINSIZE; - - RB_FOREACH(mms, mmtree, &mm->rb_free) { - if (mms->size >= size) - break; - } - - if (mms == NULL) - return (NULL); - - /* Debug */ - memset(mms->address, 0xd0, size); - - tmp = mm_make_entry(mm, &mm->rb_allocated, mms->address, size); - - /* Does not change order in RB tree */ - mms->size -= size; - mms->address = (char *)mms->address + size; - - if (mms->size == 0) { - RB_REMOVE(mmtree, &mm->rb_free, mms); - if (mm->mmalloc == NULL) - free(mms); - else - mm_free(mm->mmalloc, mms); - } - - return (tmp->address); -} - -/* Frees memory in a memory mapped area */ - -void -mm_free(struct mm_master *mm, void *address) -{ - struct mm_share *mms, *prev, tmp; - - tmp.address = address; - mms = RB_FIND(mmtree, &mm->rb_allocated, &tmp); - if (mms == NULL) - fatal("mm_free(%p): can not find %p", mm, address); - - /* Debug */ - memset(mms->address, 0xd0, mms->size); - - /* Remove from allocated list and insert in free list */ - RB_REMOVE(mmtree, &mm->rb_allocated, mms); - if (RB_INSERT(mmtree, &mm->rb_free, mms) != NULL) - fatal("mm_free(%p): double address %p", mm, address); - - /* Find previous entry */ - prev = mms; - if (RB_LEFT(prev, next)) { - prev = RB_LEFT(prev, next); - while (RB_RIGHT(prev, next)) - prev = RB_RIGHT(prev, next); - } else { - if (RB_PARENT(prev, next) && - (prev == RB_RIGHT(RB_PARENT(prev, next), next))) - prev = RB_PARENT(prev, next); - else { - while (RB_PARENT(prev, next) && - (prev == RB_LEFT(RB_PARENT(prev, next), next))) - prev = RB_PARENT(prev, next); - prev = RB_PARENT(prev, next); - } - } - - /* Check if range does not overlap */ - if (prev != NULL && MM_ADDRESS_END(prev) > address) - fatal("mm_free: memory corruption: %p(%zu) > %p", - prev->address, prev->size, address); - - /* See if we can merge backwards */ - if (prev != NULL && MM_ADDRESS_END(prev) == address) { - prev->size += mms->size; - RB_REMOVE(mmtree, &mm->rb_free, mms); - if (mm->mmalloc == NULL) - free(mms); - else - mm_free(mm->mmalloc, mms); - } else - prev = mms; - - if (prev == NULL) - return; - - /* Check if we can merge forwards */ - mms = RB_NEXT(mmtree, &mm->rb_free, prev); - if (mms == NULL) - return; - - if (MM_ADDRESS_END(prev) > mms->address) - fatal("mm_free: memory corruption: %p < %p(%zu)", - mms->address, prev->address, prev->size); - if (MM_ADDRESS_END(prev) != mms->address) - return; - - prev->size += mms->size; - RB_REMOVE(mmtree, &mm->rb_free, mms); - - if (mm->mmalloc == NULL) - free(mms); - else - mm_free(mm->mmalloc, mms); -} - -static void -mm_sync_list(struct mmtree *oldtree, struct mmtree *newtree, - struct mm_master *mm, struct mm_master *mmold) -{ - struct mm_master *mmalloc = mm->mmalloc; - struct mm_share *mms, *new; - - /* Sync free list */ - RB_FOREACH(mms, mmtree, oldtree) { - /* Check the values */ - mm_memvalid(mmold, mms, sizeof(struct mm_share)); - mm_memvalid(mm, mms->address, mms->size); - - new = mm_xmalloc(mmalloc, sizeof(struct mm_share)); - memcpy(new, mms, sizeof(struct mm_share)); - RB_INSERT(mmtree, newtree, new); - } -} - -void -mm_share_sync(struct mm_master **pmm, struct mm_master **pmmalloc) -{ - struct mm_master *mm; - struct mm_master *mmalloc; - struct mm_master *mmold; - struct mmtree rb_free, rb_allocated; - - debug3("%s: Share sync", __func__); - - mm = *pmm; - mmold = mm->mmalloc; - mm_memvalid(mmold, mm, sizeof(*mm)); - - mmalloc = mm_create(NULL, mm->size); - mm = mm_xmalloc(mmalloc, sizeof(struct mm_master)); - memcpy(mm, *pmm, sizeof(struct mm_master)); - mm->mmalloc = mmalloc; - - rb_free = mm->rb_free; - rb_allocated = mm->rb_allocated; - - RB_INIT(&mm->rb_free); - RB_INIT(&mm->rb_allocated); - - mm_sync_list(&rb_free, &mm->rb_free, mm, mmold); - mm_sync_list(&rb_allocated, &mm->rb_allocated, mm, mmold); - - mm_destroy(mmold); - - *pmm = mm; - *pmmalloc = mmalloc; - - debug3("%s: Share sync end", __func__); -} - -void -mm_memvalid(struct mm_master *mm, void *address, size_t size) -{ - void *end = (char *)address + size; - - if (address < mm->address) - fatal("mm_memvalid: address too small: %p", address); - if (end < address) - fatal("mm_memvalid: end < address: %p < %p", end, address); - if (end > MM_ADDRESS_END(mm)) - fatal("mm_memvalid: address too large: %p", address); -} diff --git a/openssh-7.2p2/monitor_mm.h b/openssh-7.2p2/monitor_mm.h deleted file mode 100644 --- a/openssh-7.2p2/monitor_mm.h +++ /dev/null @@ -1,62 +0,0 @@ -/* $OpenBSD: monitor_mm.h,v 1.6 2014/01/04 17:50:55 tedu Exp $ */ - -/* - * Copyright 2002 Niels Provos <provos@citi.umich.edu> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifndef _MM_H_ -#define _MM_H_ - -struct mm_share { - RB_ENTRY(mm_share) next; - void *address; - size_t size; -}; - -struct mm_master { - RB_HEAD(mmtree, mm_share) rb_free; - struct mmtree rb_allocated; - void *address; - size_t size; - - struct mm_master *mmalloc; /* Used to completely share */ -}; - -RB_PROTOTYPE(mmtree, mm_share, next, mm_compare) - -#define MM_MINSIZE 128 - -#define MM_ADDRESS_END(x) (void *)((char *)(x)->address + (x)->size) - -struct mm_master *mm_create(struct mm_master *, size_t); -void mm_destroy(struct mm_master *); - -void mm_share_sync(struct mm_master **, struct mm_master **); - -void *mm_malloc(struct mm_master *, size_t); -void *mm_xmalloc(struct mm_master *, size_t); -void mm_free(struct mm_master *, void *); - -void mm_memvalid(struct mm_master *, void *, size_t); -#endif /* _MM_H_ */ diff --git a/openssh-7.2p2/monitor_wrap.h b/openssh-7.2p2/monitor_wrap.h --- a/openssh-7.2p2/monitor_wrap.h +++ b/openssh-7.2p2/monitor_wrap.h @@ -107,12 +107,9 @@ void mm_send_keystate(struct monitor*); /* bsdauth */ int mm_bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); int mm_bsdauth_respond(void *, u_int, char **); /* skey */ int mm_skey_query(void *, char **, char **, u_int *, char ***, u_int **); int mm_skey_respond(void *, u_int, char **); -/* zlib allocation hooks */ -void mm_init_compression(struct mm_master *); - #endif /* _MM_WRAP_H_ */ diff --git a/openssh-7.2p2/myproposal.h b/openssh-7.2p2/myproposal.h --- a/openssh-7.2p2/myproposal.h +++ b/openssh-7.2p2/myproposal.h @@ -156,17 +156,17 @@ "hmac-sha1" #define KEX_CLIENT_KEX KEX_SERVER_KEX #define KEX_CLIENT_ENCRYPT KEX_SERVER_ENCRYPT #define KEX_CLIENT_MAC KEX_SERVER_MAC #endif /* WITH_OPENSSL */ -#define KEX_DEFAULT_COMP "none,zlib@openssh.com,zlib" +#define KEX_DEFAULT_COMP "none,zlib@openssh.com" #define KEX_DEFAULT_LANG "" #define KEX_CLIENT \ KEX_CLIENT_KEX, \ KEX_DEFAULT_PK_ALG, \ KEX_CLIENT_ENCRYPT, \ KEX_CLIENT_ENCRYPT, \ KEX_CLIENT_MAC, \ diff --git a/openssh-7.2p2/opacket.h b/openssh-7.2p2/opacket.h --- a/openssh-7.2p2/opacket.h +++ b/openssh-7.2p2/opacket.h @@ -128,19 +128,16 @@ void packet_disconnect(const char *, ... #define packet_set_server() \ ssh_packet_set_server(active_state) #define packet_set_authenticated() \ ssh_packet_set_authenticated(active_state) #define packet_get_input() \ ssh_packet_get_input(active_state) #define packet_get_output() \ ssh_packet_get_output(active_state) -#define packet_set_compress_hooks(ctx, allocfunc, freefunc) \ - ssh_packet_set_compress_hooks(active_state, ctx, \ - allocfunc, freefunc); #define packet_check_eom() \ ssh_packet_check_eom(active_state) #define set_newkeys(mode) \ ssh_set_newkeys(active_state, (mode)) #define packet_get_state(m) \ ssh_packet_get_state(active_state, m) #define packet_set_state(m) \ ssh_packet_set_state(active_state, m) diff --git a/openssh-7.2p2/openbsd-compat/Makefile.in b/openssh-7.2p2/openbsd-compat/Makefile.in --- a/openssh-7.2p2/openbsd-compat/Makefile.in +++ b/openssh-7.2p2/openbsd-compat/Makefile.in @@ -13,17 +13,17 @@ CPPFLAGS=-I. -I.. -I$(srcdir) -I$(srcdir LIBS=@LIBS@ AR=@AR@ RANLIB=@RANLIB@ INSTALL=@INSTALL@ LDFLAGS=-L. @LDFLAGS@ OPENBSD=base64.o basename.o bcrypt_pbkdf.o bindresvport.o blowfish.o daemon.o dirname.o fmt_scaled.o getcwd.o getgrouplist.o getopt_long.o getrrsetbyname.o glob.o inet_aton.o inet_ntoa.o inet_ntop.o mktemp.o pwcache.o readpassphrase.o reallocarray.o realpath.o rresvport.o setenv.o setproctitle.o sha1.o sha2.o rmd160.o md5.o sigact.o strlcat.o strlcpy.o strmode.o strnlen.o strptime.o strsep.o strtonum.o strtoll.o strtoul.o strtoull.o timingsafe_bcmp.o vis.o blowfish.o bcrypt_pbkdf.o explicit_bzero.o -COMPAT=arc4random.o bsd-asprintf.o bsd-closefrom.o bsd-cray.o bsd-cygwin_util.o bsd-getpeereid.o getrrsetbyname-ldns.o bsd-misc.o bsd-nextstep.o bsd-openpty.o bsd-poll.o bsd-setres_id.o bsd-snprintf.o bsd-statvfs.o bsd-waitpid.o fake-rfc2553.o openssl-compat.o xmmap.o xcrypt.o kludge-fd_set.o +COMPAT=arc4random.o bsd-asprintf.o bsd-closefrom.o bsd-cray.o bsd-cygwin_util.o bsd-getpeereid.o getrrsetbyname-ldns.o bsd-misc.o bsd-nextstep.o bsd-openpty.o bsd-poll.o bsd-setres_id.o bsd-snprintf.o bsd-statvfs.o bsd-waitpid.o fake-rfc2553.o openssl-compat.o xcrypt.o kludge-fd_set.o PORTS=port-aix.o port-irix.o port-linux.o port-linux-prng.o port-solaris.o port-tun.o port-uw.o .c.o: $(CC) $(CFLAGS) $(CPPFLAGS) -c $< all: libopenbsd-compat.a diff --git a/openssh-7.2p2/openbsd-compat/openbsd-compat.h b/openssh-7.2p2/openbsd-compat/openbsd-compat.h --- a/openssh-7.2p2/openbsd-compat/openbsd-compat.h +++ b/openssh-7.2p2/openbsd-compat/openbsd-compat.h @@ -259,17 +259,16 @@ int timingsafe_bcmp(const void *, const int bcrypt_pbkdf(const char *, size_t, const u_int8_t *, size_t, u_int8_t *, size_t, unsigned int); #endif #ifndef HAVE_EXPLICIT_BZERO void explicit_bzero(void *p, size_t n); #endif -void *xmmap(size_t size); char *xcrypt(const char *password, const char *salt); char *shadow_pw(struct passwd *pw); /* rfc2553 socket API replacements */ #include "fake-rfc2553.h" /* Routines for a single OS platform */ #include "bsd-cray.h" diff --git a/openssh-7.2p2/openbsd-compat/xmmap.c b/openssh-7.2p2/openbsd-compat/xmmap.c deleted file mode 100644 --- a/openssh-7.2p2/openbsd-compat/xmmap.c +++ /dev/null @@ -1,88 +0,0 @@ -/* - * Copyright (c) 2002 Tim Rice. All rights reserved. - * MAP_FAILED code by Solar Designer. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -/* $Id: xmmap.c,v 1.15 2009/02/16 04:21:40 djm Exp $ */ - -#include "includes.h" - -#include <sys/types.h> -#ifdef HAVE_SYS_MMAN_H -#include <sys/mman.h> -#endif -#include <sys/stat.h> - -#ifdef HAVE_FCNTL_H -# include <fcntl.h> -#endif -#include <errno.h> -#include <stdarg.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#include "log.h" - -void * -xmmap(size_t size) -{ -#ifdef HAVE_MMAP - void *address; - -# ifdef MAP_ANON - address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED, - -1, (off_t)0); -# else - address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, - open("/dev/zero", O_RDWR), (off_t)0); -# endif - -#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX" - if (address == (void *)MAP_FAILED) { - char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE; - int tmpfd; - mode_t old_umask; - - old_umask = umask(0177); - tmpfd = mkstemp(tmpname); - umask(old_umask); - if (tmpfd == -1) - fatal("mkstemp(\"%s\"): %s", - MM_SWAP_TEMPLATE, strerror(errno)); - unlink(tmpname); - if (ftruncate(tmpfd, size) != 0) - fatal("%s: ftruncate: %s", __func__, strerror(errno)); - address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, - tmpfd, (off_t)0); - close(tmpfd); - } - - return (address); -#else - fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported", - __func__); -#endif /* HAVE_MMAP */ - -} - diff --git a/openssh-7.2p2/packet.c b/openssh-7.2p2/packet.c --- a/openssh-7.2p2/packet.c +++ b/openssh-7.2p2/packet.c @@ -734,96 +734,16 @@ uncompress_buffer(struct ssh *ssh, struc default: ssh->state->compression_in_failures++; return SSH_ERR_INTERNAL_ERROR; } } /* NOTREACHED */ } -/* Serialise compression state into a blob for privsep */ -static int -ssh_packet_get_compress_state(struct sshbuf *m, struct ssh *ssh) -{ - struct session_state *state = ssh->state; - struct sshbuf *b; - int r; - - if ((b = sshbuf_new()) == NULL) - return SSH_ERR_ALLOC_FAIL; - if (state->compression_in_started) { - if ((r = sshbuf_put_string(b, &state->compression_in_stream, - sizeof(state->compression_in_stream))) != 0) - goto out; - } else if ((r = sshbuf_put_string(b, NULL, 0)) != 0) - goto out; - if (state->compression_out_started) { - if ((r = sshbuf_put_string(b, &state->compression_out_stream, - sizeof(state->compression_out_stream))) != 0) - goto out; - } else if ((r = sshbuf_put_string(b, NULL, 0)) != 0) - goto out; - r = sshbuf_put_stringb(m, b); - out: - sshbuf_free(b); - return r; -} - -/* Deserialise compression state from a blob for privsep */ -static int -ssh_packet_set_compress_state(struct ssh *ssh, struct sshbuf *m) -{ - struct session_state *state = ssh->state; - struct sshbuf *b = NULL; - int r; - const u_char *inblob, *outblob; - size_t inl, outl; - - if ((r = sshbuf_froms(m, &b)) != 0) - goto out; - if ((r = sshbuf_get_string_direct(b, &inblob, &inl)) != 0 || - (r = sshbuf_get_string_direct(b, &outblob, &outl)) != 0) - goto out; - if (inl == 0) - state->compression_in_started = 0; - else if (inl != sizeof(state->compression_in_stream)) { - r = SSH_ERR_INTERNAL_ERROR; - goto out; - } else { - state->compression_in_started = 1; - memcpy(&state->compression_in_stream, inblob, inl); - } - if (outl == 0) - state->compression_out_started = 0; - else if (outl != sizeof(state->compression_out_stream)) { - r = SSH_ERR_INTERNAL_ERROR; - goto out; - } else { - state->compression_out_started = 1; - memcpy(&state->compression_out_stream, outblob, outl); - } - r = 0; - out: - sshbuf_free(b); - return r; -} - -void -ssh_packet_set_compress_hooks(struct ssh *ssh, void *ctx, - void *(*allocfunc)(void *, u_int, u_int), - void (*freefunc)(void *, void *)) -{ - ssh->state->compression_out_stream.zalloc = (alloc_func)allocfunc; - ssh->state->compression_out_stream.zfree = (free_func)freefunc; - ssh->state->compression_out_stream.opaque = ctx; - ssh->state->compression_in_stream.zalloc = (alloc_func)allocfunc; - ssh->state->compression_in_stream.zfree = (free_func)freefunc; - ssh->state->compression_in_stream.opaque = ctx; -} - /* * Causes any further packets to be encrypted using the given key. The same * key is used for both sending and reception. However, both directions are * encrypted independently of each other. */ void ssh_packet_set_encryption_key(struct ssh *ssh, const u_char *key, u_int keylen, int number) @@ -2489,31 +2409,24 @@ packet_destroy_all(int audit_it, int pri #endif } } /* Reset after_authentication and reset compression in post-auth privsep */ static int ssh_packet_set_postauth(struct ssh *ssh) { - struct sshcomp *comp; - int r, mode; + int r; debug("%s: called", __func__); /* This was set in net child, but is not visible in user child */ ssh->state->after_authentication = 1; ssh->state->rekeying = 0; - for (mode = 0; mode < MODE_MAX; mode++) { - if (ssh->state->newkeys[mode] == NULL) - continue; - comp = &ssh->state->newkeys[mode]->comp; - if (comp && comp->enabled && - (r = ssh_packet_init_compression(ssh)) != 0) - return r; - } + if ((r = ssh_packet_enable_delayed_compress(ssh)) != 0) + return r; return 0; } /* Packet state (de-)serialization for privsep */ /* turn kex into a blob for packet state serialization */ static int kex_to_blob(struct sshbuf *m, struct kex *kex) @@ -2567,17 +2480,16 @@ newkeys_to_blob(struct sshbuf *m, struct goto out; if (cipher_authlen(enc->cipher) == 0) { if ((r = sshbuf_put_cstring(b, mac->name)) != 0 || (r = sshbuf_put_u32(b, mac->enabled)) != 0 || (r = sshbuf_put_string(b, mac->key, mac->key_len)) != 0) goto out; } if ((r = sshbuf_put_u32(b, comp->type)) != 0 || - (r = sshbuf_put_u32(b, comp->enabled)) != 0 || (r = sshbuf_put_cstring(b, comp->name)) != 0) goto out; r = sshbuf_put_stringb(m, b); out: sshbuf_free(b); return r; } @@ -2628,19 +2540,17 @@ ssh_packet_get_state(struct ssh *ssh, st return r; if (cipher_get_keycontext(&state->send_context, p) != (int)slen) return SSH_ERR_INTERNAL_ERROR; if ((r = sshbuf_put_u32(m, rlen)) != 0 || (r = sshbuf_reserve(m, rlen, &p)) != 0) return r; if (cipher_get_keycontext(&state->receive_context, p) != (int)rlen) return SSH_ERR_INTERNAL_ERROR; - - if ((r = ssh_packet_get_compress_state(m, ssh)) != 0 || - (r = sshbuf_put_stringb(m, state->input)) != 0 || + if ((r = sshbuf_put_stringb(m, state->input)) != 0 || (r = sshbuf_put_stringb(m, state->output)) != 0) return r; return 0; } /* restore key exchange results from blob for packet state de-serialization */ static int @@ -2684,17 +2594,16 @@ newkeys_from_blob(struct sshbuf *m, stru goto out; if (maclen > mac->key_len) { r = SSH_ERR_INVALID_FORMAT; goto out; } mac->key_len = maclen; } if ((r = sshbuf_get_u32(b, &comp->type)) != 0 || - (r = sshbuf_get_u32(b, (u_int *)&comp->enabled)) != 0 || (r = sshbuf_get_cstring(b, &comp->name, NULL)) != 0) goto out; if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) { r = SSH_ERR_INVALID_FORMAT; goto out; } if (sshbuf_len(b) != 0) { @@ -2812,18 +2721,17 @@ ssh_packet_set_state(struct ssh *ssh, st (r = sshbuf_get_string_direct(m, &keyin, &rlen)) != 0) return r; if (cipher_get_keycontext(&state->send_context, NULL) != (int)slen || cipher_get_keycontext(&state->receive_context, NULL) != (int)rlen) return SSH_ERR_INVALID_FORMAT; cipher_set_keycontext(&state->send_context, keyout); cipher_set_keycontext(&state->receive_context, keyin); - if ((r = ssh_packet_set_compress_state(ssh, m)) != 0 || - (r = ssh_packet_set_postauth(ssh)) != 0) + if ((r = ssh_packet_set_postauth(ssh)) != 0) return r; sshbuf_reset(state->input); sshbuf_reset(state->output); if ((r = sshbuf_get_string_direct(m, &input, &ilen)) != 0 || (r = sshbuf_get_string_direct(m, &output, &olen)) != 0 || (r = sshbuf_put(state->input, input, ilen)) != 0 || (r = sshbuf_put(state->output, output, olen)) != 0) diff --git a/openssh-7.2p2/packet.h b/openssh-7.2p2/packet.h --- a/openssh-7.2p2/packet.h +++ b/openssh-7.2p2/packet.h @@ -113,21 +113,16 @@ const void *ssh_packet_get_string_ptr(st void ssh_packet_disconnect(struct ssh *, const char *fmt, ...) __attribute__((format(printf, 2, 3))) __attribute__((noreturn)); void ssh_packet_send_debug(struct ssh *, const char *fmt, ...) __attribute__((format(printf, 2, 3))); int ssh_set_newkeys(struct ssh *, int mode); void ssh_packet_get_bytes(struct ssh *, u_int64_t *, u_int64_t *); -typedef void *(ssh_packet_comp_alloc_func)(void *, u_int, u_int); -typedef void (ssh_packet_comp_free_func)(void *, void *); -void ssh_packet_set_compress_hooks(struct ssh *, void *, - ssh_packet_comp_alloc_func *, ssh_packet_comp_free_func *); - int ssh_packet_write_poll(struct ssh *); int ssh_packet_write_wait(struct ssh *); int ssh_packet_have_data_to_write(struct ssh *); int ssh_packet_not_very_much_data_to_write(struct ssh *); int ssh_packet_connection_is_on_socket(struct ssh *); int ssh_packet_remaining(struct ssh *); void ssh_packet_send_ignore(struct ssh *, int); diff --git a/openssh-7.2p2/servconf.c b/openssh-7.2p2/servconf.c --- a/openssh-7.2p2/servconf.c +++ b/openssh-7.2p2/servconf.c @@ -984,18 +984,18 @@ static const struct multistate multistat { "without-password", PERMIT_NO_PASSWD }, { "prohibit-password", PERMIT_NO_PASSWD }, { "forced-commands-only", PERMIT_FORCED_ONLY }, { "yes", PERMIT_YES }, { "no", PERMIT_NO }, { NULL, -1 } }; static const struct multistate multistate_compression[] = { + { "yes", COMP_DELAYED }, { "delayed", COMP_DELAYED }, - { "yes", COMP_ZLIB }, { "no", COMP_NONE }, { NULL, -1 } }; static const struct multistate multistate_gatewayports[] = { { "clientspecified", 2 }, { "yes", 1 }, { "no", 0 }, { NULL, -1 } diff --git a/openssh-7.2p2/sshconnect2.c b/openssh-7.2p2/sshconnect2.c --- a/openssh-7.2p2/sshconnect2.c +++ b/openssh-7.2p2/sshconnect2.c @@ -194,20 +194,20 @@ ssh_kex2(char *host, struct sockaddr *ho #endif myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal(options.ciphers); myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal(options.ciphers); if (options.compression) { myproposal[PROPOSAL_COMP_ALGS_CTOS] = - myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; + myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,none"; } else { myproposal[PROPOSAL_COMP_ALGS_CTOS] = - myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; + myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com"; } myproposal[PROPOSAL_MAC_ALGS_CTOS] = myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; if (options.hostkeyalgorithms != NULL) { if (kex_assemble_names(KEX_DEFAULT_PK_ALG, &options.hostkeyalgorithms) != 0) fatal("%s: kex_assemble_namelist", __func__); myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = diff --git a/openssh-7.2p2/sshd.c b/openssh-7.2p2/sshd.c --- a/openssh-7.2p2/sshd.c +++ b/openssh-7.2p2/sshd.c @@ -112,17 +112,16 @@ #include "canohost.h" #include "hostfile.h" #include "auth.h" #include "authfd.h" #include "msg.h" #include "dispatch.h" #include "channels.h" #include "session.h" -#include "monitor_mm.h" #include "monitor.h" #ifdef GSSAPI #include "ssh-gss.h" #endif #include "monitor_wrap.h" #include "audit.h" #include "ssh-sandbox.h" #include "version.h" @@ -748,19 +747,16 @@ privsep_preauth(Authctxt *authctxt) ssh_err(r)); have_agent = 0; } } if (box != NULL) ssh_sandbox_parent_preauth(box, pid); monitor_child_preauth(authctxt, pmonitor); - /* Sync memory */ - monitor_sync(pmonitor); - /* Wait for the child's exit status */ while (waitpid(pid, &status, 0) < 0) { if (errno == EINTR) continue; pmonitor->m_pid = -1; fatal("%s: waitpid: %s", __func__, strerror(errno)); } privsep_is_preauth = 0; @@ -2765,19 +2761,16 @@ do_ssh2_kex(void) myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal( options.ciphers); myproposal[PROPOSAL_MAC_ALGS_CTOS] = myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; if (options.compression == COMP_NONE) { myproposal[PROPOSAL_COMP_ALGS_CTOS] = myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; - } else if (options.compression == COMP_DELAYED) { - myproposal[PROPOSAL_COMP_ALGS_CTOS] = - myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com"; } if (options.rekey_limit || options.rekey_interval) packet_set_rekey_limits(options.rekey_limit, (time_t)options.rekey_interval); myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal( list_hostkey_types()); diff --git a/openssh-7.2p2/sshd_config.5 b/openssh-7.2p2/sshd_config.5 --- a/openssh-7.2p2/sshd_config.5 +++ b/openssh-7.2p2/sshd_config.5 @@ -530,25 +530,27 @@ will be disconnected after approximately Sets a timeout interval in seconds after which if no data has been received from the client, .Xr sshd 8 will send a message through the encrypted channel to request a response from the client. The default is 0, indicating that these messages will not be sent to the client. .It Cm Compression -Specifies whether compression is allowed, or delayed until +Specifies whether compression is enabled after the user has authenticated successfully. The argument must be .Dq yes , -.Dq delayed , +.Dq delayed +(a legacy synonym for +.Dq yes ) or .Dq no . The default is -.Dq delayed . +.Dq yes . .It Cm DenyGroups This keyword can be followed by a list of group name patterns, separated by spaces. Login is disallowed for users whose primary group or supplementary group list matches one of the patterns. Only group names are valid; a numerical group ID is not recognized. By default, login is allowed for all groups. The allow/deny directives are processed in the following order:
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