Retire the NONE cipher option.
This commit is contained in:
parent
643090321a
commit
24641fd80b
@ -1,14 +1,5 @@
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Notes:
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NONE CIPHER:
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To use the NONE option you must have the NoneEnabled switch set on the server
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and you MUST have *both* NoneEnabled and NoneSwitch set to yes on the client.
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The NONE feature works with ALL ssh subsystems (as far as we can tell)
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as long as there is no tty allocated.
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If a user uses the -T switch to prevent a tty being created the NONE cipher
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will be disabled.
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PERFORMANCE:
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The performance increase will only be as good as the network and TCP stack
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tuning on the reciever side of the connection allows. As a rule of thumb a
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@ -93,22 +84,6 @@ HPN SPECIFIC CONFIGURATION OPTIONS:
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the throughput will be no more than n/RTT. The minimum buffer size is 1KB.
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Default is the current system wide TCP receive buffer size.
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- NoneEnabled=[yes/no] client/server
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Enable or disable the use of the None cipher. Care must always be used when
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enabling this as it will allow users to send data in the clear. However, it
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is important to note that authentication information remains encrypted even
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if this option is enabled. Set to no by default.
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- NoneSwitch=[yes/no] client
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Switch the encryption cipher being used to the None cipher after
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authentication takes place. NoneEnabled must be enabled on both the client
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and server side of the connection. When the connection switches to the NONE
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cipher a warning is sent to STDERR. The connection attempt will fail with an
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error if a client requests a NoneSwitch from the server that does not
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explicitly have NoneEnabled set to yes.
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Note: The NONE cipher cannot be used in interactive (shell) sessions and it
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will fail silently. Set to no by default.
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CREDITS:
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@ -36,7 +36,6 @@
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*/
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#include "includes.h"
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__RCSID("$FreeBSD$");
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#include <sys/types.h>
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@ -225,12 +224,7 @@ ciphers_valid(const char *names)
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for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
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(p = strsep(&cp, CIPHER_SEP))) {
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c = cipher_by_name(p);
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#ifdef NONE_CIPHER_ENABLED
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if (c == NULL || (c->number != SSH_CIPHER_SSH2 &&
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c->number != SSH_CIPHER_NONE)) {
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#else
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if (c == NULL || (c->number != SSH_CIPHER_SSH2)) {
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#endif
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if (c == NULL || c->number != SSH_CIPHER_SSH2) {
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debug("bad cipher %s [%s]", p, names);
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free(cipher_list);
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return 0;
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@ -485,9 +479,6 @@ cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len)
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}
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switch (c->number) {
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#ifdef NONE_CIPHER_ENABLED
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case SSH_CIPHER_NONE:
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#endif
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case SSH_CIPHER_SSH2:
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case SSH_CIPHER_DES:
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case SSH_CIPHER_BLOWFISH:
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@ -527,9 +518,6 @@ cipher_set_keyiv(CipherContext *cc, u_char *iv)
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return;
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switch (c->number) {
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#ifdef NONE_CIPHER_ENABLED
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case SSH_CIPHER_NONE:
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#endif
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case SSH_CIPHER_SSH2:
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case SSH_CIPHER_DES:
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case SSH_CIPHER_BLOWFISH:
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@ -24,7 +24,6 @@
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*/
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#include "includes.h"
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__RCSID("$FreeBSD$");
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#include <sys/param.h>
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@ -146,13 +145,8 @@ kex_names_valid(const char *names)
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return 1;
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}
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/* put algorithm proposal into buffer. */
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#ifndef NONE_CIPHER_ENABLED
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/* put algorithm proposal into buffer */
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static void
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#else
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/* Also used in sshconnect2.c. */
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void
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#endif
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kex_prop2buf(Buffer *b, char *proposal[PROPOSAL_MAX])
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{
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u_int i;
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@ -466,9 +460,6 @@ kex_choose_conf(Kex *kex)
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int nenc, nmac, ncomp;
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u_int mode, ctos, need, dh_need, authlen;
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int first_kex_follows, type;
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#ifdef NONE_CIPHER_ENABLED
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int auth_flag;
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#endif
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my = kex_buf2prop(&kex->my, NULL);
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peer = kex_buf2prop(&kex->peer, &first_kex_follows);
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@ -492,10 +483,6 @@ kex_choose_conf(Kex *kex)
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}
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/* Algorithm Negotiation */
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#ifdef NONE_CIPHER_ENABLED
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auth_flag = packet_get_authentication_state();
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debug ("AUTH STATE is %d", auth_flag);
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#endif
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for (mode = 0; mode < MODE_MAX; mode++) {
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newkeys = xcalloc(1, sizeof(*newkeys));
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kex->newkeys[mode] = newkeys;
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@ -510,17 +497,6 @@ kex_choose_conf(Kex *kex)
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if (authlen == 0)
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choose_mac(&newkeys->mac, cprop[nmac], sprop[nmac]);
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choose_comp(&newkeys->comp, cprop[ncomp], sprop[ncomp]);
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#ifdef NONE_CIPHER_ENABLED
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debug("REQUESTED ENC.NAME is '%s'", newkeys->enc.name);
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if (strcmp(newkeys->enc.name, "none") == 0) {
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debug("Requesting NONE. Authflag is %d", auth_flag);
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if (auth_flag == 1)
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debug("None requested post authentication.");
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else
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fatal("Pre-authentication none cipher requests "
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"are not allowed.");
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}
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#endif
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debug("kex: %s %s %s %s",
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ctos ? "client->server" : "server->client",
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newkeys->enc.name,
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@ -1,5 +1,4 @@
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/* $OpenBSD: kex.h,v 1.62 2014/01/27 18:58:14 markus Exp $ */
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/* $FreeBSD$ */
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/*
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* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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@ -149,10 +148,6 @@ struct Kex {
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int kex_names_valid(const char *);
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char *kex_alg_list(char);
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#ifdef NONE_CIPHER_ENABLED
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void kex_prop2buf(Buffer *, char *[PROPOSAL_MAX]);
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#endif
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Kex *kex_setup(char *[PROPOSAL_MAX]);
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void kex_finish(Kex *);
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@ -1,5 +1,4 @@
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/* $OpenBSD: myproposal.h,v 1.35 2013/12/06 13:39:49 markus Exp $ */
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/* $FreeBSD$ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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@ -110,10 +109,6 @@
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"chacha20-poly1305@openssh.com," \
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"aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc," \
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"aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se"
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#ifdef NONE_CIPHER_ENABLED
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#define KEX_ENCRYPT_INCLUDE_NONE KEX_DEFAULT_ENCRYPT \
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",none"
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#endif
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#define KEX_DEFAULT_MAC \
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"hmac-md5-etm@openssh.com," \
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@ -20,7 +20,6 @@
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#define _BSD_MISC_H
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#include "includes.h"
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__RCSID("$FreeBSD$");
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char *ssh_get_progname(char *);
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@ -202,9 +202,6 @@ struct session_state {
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};
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static struct session_state *active_state, *backup_state;
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#ifdef NONE_CIPHER_ENABLED
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static int rekey_requested = 0;
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#endif
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static struct session_state *
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alloc_session_state(void)
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@ -1316,7 +1313,6 @@ packet_read_poll2(u_int32_t *seqnr_p)
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buffer_ptr(&active_state->input), block_size, 0, 0) != 0)
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fatal("Decryption integrity check failed");
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cp = buffer_ptr(&active_state->incoming_packet);
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active_state->packlen = get_u32(cp);
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if (active_state->packlen < 1 + 4 ||
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active_state->packlen > PACKET_MAX_SIZE) {
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@ -1943,26 +1939,12 @@ packet_send_ignore(int nbytes)
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}
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}
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#ifdef NONE_CIPHER_ENABLED
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void
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packet_request_rekeying(void)
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{
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rekey_requested = 1;
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}
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#endif
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#define MAX_PACKETS (1U<<31)
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int
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packet_need_rekeying(void)
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{
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if (datafellows & SSH_BUG_NOREKEY)
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return 0;
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#ifdef NONE_CIPHER_ENABLED
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if (rekey_requested == 1) {
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rekey_requested = 0;
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return 1;
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}
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#endif
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return
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(active_state->p_send.packets > MAX_PACKETS) ||
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(active_state->p_read.packets > MAX_PACKETS) ||
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@ -2074,11 +2056,3 @@ packet_restore_state(void)
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add_recv_bytes(len);
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}
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}
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#ifdef NONE_CIPHER_ENABLED
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int
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packet_get_authentication_state(void)
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{
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return (active_state->after_authentication);
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}
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#endif
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/* $OpenBSD: packet.h,v 1.59 2013/07/12 00:19:59 djm Exp $ */
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/* $FreeBSD$ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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@ -39,9 +38,6 @@ void packet_set_interactive(int, int, int);
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int packet_is_interactive(void);
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void packet_set_server(void);
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void packet_set_authenticated(void);
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#ifdef NONE_CIPHER_ENABLED
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int packet_get_authentication_state(void);
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#endif
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void packet_start(u_char);
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void packet_put_char(int ch);
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@ -119,9 +115,6 @@ do { \
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} while (0)
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int packet_need_rekeying(void);
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#ifdef NONE_CIPHER_ENABLED
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void packet_request_rekeying(void);
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#endif
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void packet_set_rekey_limits(u_int32_t, time_t);
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time_t packet_get_rekey_timeout(void);
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@ -1,5 +1,4 @@
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/* $OpenBSD: pathnames.h,v 1.24 2013/12/06 13:39:49 markus Exp $ */
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/* $FreeBSD$ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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@ -122,7 +121,7 @@
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* Default location of askpass
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*/
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#ifndef _PATH_SSH_ASKPASS_DEFAULT
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#define _PATH_SSH_ASKPASS_DEFAULT "/usr/local/bin/ssh-askpass"
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#define _PATH_SSH_ASKPASS_DEFAULT "/usr/X11R6/bin/ssh-askpass"
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#endif
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/* Location of ssh-keysign for hostbased authentication */
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@ -137,7 +136,7 @@
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/* xauth for X11 forwarding */
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#ifndef _PATH_XAUTH
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#define _PATH_XAUTH "/usr/local/bin/xauth"
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#define _PATH_XAUTH "/usr/X11R6/bin/xauth"
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#endif
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/* UNIX domain socket for X11 server; displaynum will replace %u */
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@ -154,9 +154,6 @@ typedef enum {
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oCanonicalizeFallbackLocal, oCanonicalizePermittedCNAMEs,
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oIgnoredUnknownOption,
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oHPNDisabled, oHPNBufferSize, oTcpRcvBufPoll, oTcpRcvBuf,
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#ifdef NONE_CIPHER_ENABLED
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oNoneEnabled, oNoneSwitch,
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#endif
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oVersionAddendum, oDeprecated, oUnsupported
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} OpCodes;
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@ -274,10 +271,6 @@ static struct {
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{ "hpnbuffersize", oHPNBufferSize },
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{ "tcprcvbufpoll", oTcpRcvBufPoll },
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{ "tcprcvbuf", oTcpRcvBuf },
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#ifdef NONE_CIPHER_ENABLED
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{ "noneenabled", oNoneEnabled },
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{ "noneswitch", oNoneSwitch },
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#endif
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{ "versionaddendum", oVersionAddendum },
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{ NULL, oBadOption }
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@ -1375,31 +1368,6 @@ process_config_line(Options *options, struct passwd *pw, const char *host,
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intptr = &options->tcp_rcv_buf;
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goto parse_int;
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#ifdef NONE_CIPHER_ENABLED
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case oNoneEnabled:
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intptr = &options->none_enabled;
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goto parse_flag;
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/*
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* We check to see if the command comes from the command line or not.
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* If it does then enable it otherwise fail. NONE must never be a
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* default configuration.
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*/
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case oNoneSwitch:
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if (strcmp(filename,"command-line") == 0) {
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intptr = &options->none_switch;
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goto parse_flag;
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} else {
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debug("NoneSwitch directive found in %.200s.",
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filename);
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error("NoneSwitch is found in %.200s.\n"
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"You may only use this configuration option "
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"from the command line", filename);
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error("Continuing...");
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return 0;
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}
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#endif
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case oVersionAddendum:
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if (s == NULL)
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fatal("%.200s line %d: Missing argument.", filename,
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@ -1659,10 +1627,6 @@ initialize_options(Options * options)
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options->hpn_buffer_size = -1;
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options->tcp_rcv_buf_poll = -1;
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options->tcp_rcv_buf = -1;
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#ifdef NONE_CIPHER_ENABLED
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options->none_enabled = -1;
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options->none_switch = -1;
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#endif
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}
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/*
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@ -1883,11 +1847,6 @@ fill_default_options(Options * options)
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options->tcp_rcv_buf *= 1024;
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if (options->tcp_rcv_buf_poll == -1)
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options->tcp_rcv_buf_poll = 1;
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#ifdef NONE_CIPHER_ENABLED
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/* options->none_enabled must not be set by default */
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if (options->none_switch == -1)
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options->none_switch = 0;
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#endif
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}
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/*
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@ -1,5 +1,4 @@
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/* $OpenBSD: readconf.h,v 1.101 2014/02/23 20:11:36 djm Exp $ */
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/* $FreeBSD$ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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@ -165,10 +164,6 @@ typedef struct {
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* transfer. */
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int tcp_rcv_buf; /* User switch to set tcp recv buffer. */
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#ifdef NONE_CIPHER_ENABLED
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int none_enabled; /* Allow none to be used */
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int none_switch; /* Use none cipher */
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#endif
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} Options;
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#define SSH_CANONICALISE_NO 0
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@ -158,9 +158,6 @@ initialize_server_options(ServerOptions *options)
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options->hpn_disabled = -1;
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options->hpn_buffer_size = -1;
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options->tcp_rcv_buf_poll = -1;
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#ifdef NONE_CIPHER_ENABLED
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options->none_enabled = -1;
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#endif
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}
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void
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@ -389,9 +386,6 @@ typedef enum {
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sAuthorizedKeysCommand, sAuthorizedKeysCommandUser,
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sAuthenticationMethods, sHostKeyAgent,
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sHPNDisabled, sHPNBufferSize, sTcpRcvBufPoll,
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#ifdef NONE_CIPHER_ENABLED
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sNoneEnabled,
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#endif
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sDeprecated, sUnsupported
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} ServerOpCodes;
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@ -521,9 +515,6 @@ static struct {
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{ "hpndisabled", sHPNDisabled, SSHCFG_ALL },
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{ "hpnbuffersize", sHPNBufferSize, SSHCFG_ALL },
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{ "tcprcvbufpoll", sTcpRcvBufPoll, SSHCFG_ALL },
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#ifdef NONE_CIPHER_ENABLED
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{ "noneenabled", sNoneEnabled, SSHCFG_ALL },
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#endif
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{ NULL, sBadOption, 0 }
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};
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@ -1682,12 +1673,6 @@ process_server_config_line(ServerOptions *options, char *line,
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intptr = &options->tcp_rcv_buf_poll;
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goto parse_flag;
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#ifdef NONE_CIPHER_ENABLED
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case sNoneEnabled:
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intptr = &options->none_enabled;
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goto parse_flag;
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#endif
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case sDeprecated:
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logit("%s line %d: Deprecated option %s",
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filename, linenum, arg);
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|
@ -1,5 +1,4 @@
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/* $OpenBSD: servconf.h,v 1.112 2014/01/29 06:18:35 djm Exp $ */
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/* $FreeBSD$ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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@ -188,10 +187,6 @@ typedef struct {
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* kernels. */
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u_int num_auth_methods;
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char *auth_methods[MAX_AUTH_METHODS];
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#ifdef NONE_CIPHER_ENABLED
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int none_enabled; /* Enable NONE cipher switch. */
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#endif
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} ServerOptions;
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/* Information about the incoming connection as used by Match */
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|
@ -782,15 +782,6 @@ main(int ac, char **av)
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break;
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case 'T':
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options.request_tty = REQUEST_TTY_NO;
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#ifdef NONE_CIPHER_ENABLED
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/*
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* Ensure that the user does not try to backdoor a
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* NONE cipher switch on an interactive session by
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* explicitly disabling it if the user asks for a
|
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* session without a tty.
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*/
|
||||
options.none_switch = 0;
|
||||
#endif
|
||||
break;
|
||||
case 'o':
|
||||
line = xstrdup(optarg);
|
||||
|
@ -25,7 +25,6 @@
|
||||
*/
|
||||
|
||||
#include "includes.h"
|
||||
__RCSID("$FreeBSD$");
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/socket.h>
|
||||
@ -80,16 +79,6 @@ __RCSID("$FreeBSD$");
|
||||
extern char *client_version_string;
|
||||
extern char *server_version_string;
|
||||
extern Options options;
|
||||
#ifdef NONE_CIPHER_ENABLED
|
||||
extern Kex *xxx_kex;
|
||||
|
||||
/*
|
||||
* tty_flag is set in ssh.c so we can use it here. If set then prevent
|
||||
* the switch to the null cipher.
|
||||
*/
|
||||
|
||||
extern int tty_flag;
|
||||
#endif
|
||||
|
||||
/*
|
||||
* SSH2 key exchange
|
||||
@ -422,29 +411,6 @@ ssh_userauth2(const char *local_user, const char *server_user, char *host,
|
||||
pubkey_cleanup(&authctxt);
|
||||
dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
|
||||
|
||||
#ifdef NONE_CIPHER_ENABLED
|
||||
/*
|
||||
* If the user explicitly requests to use the none cipher enable it
|
||||
* post authentication and only if the right conditions are met: both
|
||||
* of the NONE switches must be true and there must be no tty allocated.
|
||||
*/
|
||||
if (options.none_switch == 1 && options.none_enabled == 1) {
|
||||
if (!tty_flag) {
|
||||
debug("Requesting none cipher re-keying...");
|
||||
myproposal[PROPOSAL_ENC_ALGS_STOC] = "none";
|
||||
myproposal[PROPOSAL_ENC_ALGS_CTOS] = "none";
|
||||
kex_prop2buf(&xxx_kex->my, myproposal);
|
||||
packet_request_rekeying();
|
||||
fprintf(stderr, "WARNING: enabled NONE cipher\n");
|
||||
} else {
|
||||
/* Requested NONE cipher on an interactive session. */
|
||||
debug("Cannot switch to NONE cipher with tty "
|
||||
"allocated");
|
||||
fprintf(stderr, "NONE cipher switch disabled given "
|
||||
"a TTY is allocated\n");
|
||||
}
|
||||
}
|
||||
#endif
|
||||
debug("Authentication succeeded (%s).", authctxt.method->name);
|
||||
}
|
||||
|
||||
|
@ -2501,12 +2501,6 @@ do_ssh2_kex(void)
|
||||
if (options.ciphers != NULL) {
|
||||
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
|
||||
myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
|
||||
#ifdef NONE_CIPHER_ENABLED
|
||||
} else if (options.none_enabled == 1) {
|
||||
debug ("WARNING: None cipher enabled");
|
||||
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
|
||||
myproposal[PROPOSAL_ENC_ALGS_STOC] = KEX_ENCRYPT_INCLUDE_NONE;
|
||||
#endif
|
||||
}
|
||||
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
|
||||
compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
|
||||
|
@ -43,10 +43,6 @@ CFLAGS+= -I${SSHDIR} -include ssh_namespace.h
|
||||
CFLAGS+= -include krb5_config.h
|
||||
.endif
|
||||
|
||||
.if ${MK_OPENSSH_NONE_CIPHER} != "no"
|
||||
CFLAGS+= -DNONE_CIPHER_ENABLED
|
||||
.endif
|
||||
|
||||
NO_LINT=
|
||||
|
||||
LIBADD+= crypto crypt z
|
||||
|
@ -26,10 +26,6 @@ CFLAGS+= -include krb5_config.h
|
||||
LIBADD+= gssapi
|
||||
.endif
|
||||
|
||||
.if ${MK_OPENSSH_NONE_CIPHER} != "no"
|
||||
CFLAGS+= -DNONE_CIPHER_ENABLED
|
||||
.endif
|
||||
|
||||
LIBADD+= crypto
|
||||
|
||||
.if defined(LOCALBASE)
|
||||
|
@ -44,10 +44,6 @@ CFLAGS+= -include krb5_config.h
|
||||
LIBADD+= gssapi_krb5 gssapi krb5
|
||||
.endif
|
||||
|
||||
.if ${MK_OPENSSH_NONE_CIPHER} != "no"
|
||||
CFLAGS+= -DNONE_CIPHER_ENABLED
|
||||
.endif
|
||||
|
||||
LIBADD+= crypto
|
||||
|
||||
.if defined(LOCALBASE)
|
||||
|
@ -184,7 +184,6 @@ __DEFAULT_NO_OPTIONS = \
|
||||
NAND \
|
||||
OFED \
|
||||
OPENLDAP \
|
||||
OPENSSH_NONE_CIPHER \
|
||||
SHARED_TOOLCHAIN \
|
||||
SORT_THREADS \
|
||||
SVN
|
||||
|
@ -1,9 +0,0 @@
|
||||
.\" $FreeBSD$
|
||||
Set to include the "None" cipher support in OpenSSH and its libraries.
|
||||
Additional adjustments may need to be done to system configuration
|
||||
files, such as
|
||||
.Xr sshd_config 5 ,
|
||||
to enable this cipher.
|
||||
Please see
|
||||
.Pa /usr/src/crypto/openssh/README.hpn
|
||||
for full details.
|
Loading…
Reference in New Issue
Block a user