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authorDamien Miller <djm@mindrot.org>2000-05-30 13:44:51 +1000
committerDamien Miller <djm@mindrot.org>2000-05-30 13:44:51 +1000
commitb1715dc0cf5ea91707b437310f63b17bed2dc7a6 (patch)
treef7fe557697d12b37c6be6a97c6ce083d23fd07de
parent9448c002db7427058ecca76760f3a75e379bf0a1 (diff)
- OpenBSD CVS updates:
- markus@cvs.openbsd.org [session.c] make x11-fwd work w/ localhost (xauth add host/unix:11) [cipher.c compat.c readconf.c servconf.c] check strtok() != NULL; ok niels@ [key.c] fix key_read() for uuencoded keys w/o '=' [serverloop.c] group ssh1 vs. ssh2 in serverloop [kex.c kex.h myproposal.h sshconnect2.c sshd.c] split kexinit/kexdh, factor out common code [readconf.c ssh.1 ssh.c] forwardagent defaults to no, add ssh -A - theo@cvs.openbsd.org [session.c] just some line shortening
-rw-r--r--ChangeLog17
-rw-r--r--cipher.c6
-rw-r--r--compat.c8
-rw-r--r--kex.c96
-rw-r--r--kex.h13
-rw-r--r--key.c18
-rw-r--r--myproposal.h2
-rw-r--r--readconf.c10
-rw-r--r--servconf.c6
-rw-r--r--serverloop.c51
-rw-r--r--session.c34
-rw-r--r--ssh.112
-rw-r--r--ssh.c6
-rw-r--r--sshconnect2.c137
-rw-r--r--sshd.c47
15 files changed, 256 insertions, 207 deletions
diff --git a/ChangeLog b/ChangeLog
index 3037eac3..f8dcd9ce 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,23 @@
- Define atexit for old Solaris
- Fix buffer overrun in login.c for systems which use syslen in utmpx.
patch from YOSHIFUJI Hideaki <yoshfuji@cerberus.nemoto.ecei.tohoku.ac.jp>
+ - OpenBSD CVS updates:
+ - markus@cvs.openbsd.org
+ [session.c]
+ make x11-fwd work w/ localhost (xauth add host/unix:11)
+ [cipher.c compat.c readconf.c servconf.c]
+ check strtok() != NULL; ok niels@
+ [key.c]
+ fix key_read() for uuencoded keys w/o '='
+ [serverloop.c]
+ group ssh1 vs. ssh2 in serverloop
+ [kex.c kex.h myproposal.h sshconnect2.c sshd.c]
+ split kexinit/kexdh, factor out common code
+ [readconf.c ssh.1 ssh.c]
+ forwardagent defaults to no, add ssh -A
+ - theo@cvs.openbsd.org
+ [session.c]
+ just some line shortening
20000520
- Xauth fix from Markus Friedl <markus.friedl@informatik.uni-erlangen.de>
diff --git a/cipher.c b/cipher.c
index 639c1abb..4117cb77 100644
--- a/cipher.c
+++ b/cipher.c
@@ -12,7 +12,7 @@
*/
#include "includes.h"
-RCSID("$Id: cipher.c,v 1.20 2000/04/16 02:31:50 damien Exp $");
+RCSID("$Id: cipher.c,v 1.21 2000/05/30 03:44:52 damien Exp $");
#include "ssh.h"
#include "cipher.h"
@@ -178,7 +178,7 @@ ciphers_valid(const char *names)
char *p;
int i;
- if (strcmp(names, "") == 0)
+ if (names == NULL || strcmp(names, "") == 0)
return 0;
ciphers = xstrdup(names);
for ((p = strtok(ciphers, CIPHER_SEP)); p; (p = strtok(NULL, CIPHER_SEP))) {
@@ -201,6 +201,8 @@ int
cipher_number(const char *name)
{
int i;
+ if (name == NULL)
+ return -1;
for (i = 0; i < sizeof(cipher_names) / sizeof(cipher_names[0]); i++)
if (strcmp(cipher_names[i], name) == 0 &&
(cipher_mask() & (1 << i)))
diff --git a/compat.c b/compat.c
index 00f031b8..967e0b6b 100644
--- a/compat.c
+++ b/compat.c
@@ -28,7 +28,7 @@
*/
#include "includes.h"
-RCSID("$Id: compat.c,v 1.10 2000/05/09 01:03:00 damien Exp $");
+RCSID("$Id: compat.c,v 1.11 2000/05/30 03:44:53 damien Exp $");
#include "ssh.h"
#include "packet.h"
@@ -80,10 +80,12 @@ compat_datafellows(const char *version)
int
proto_spec(const char *spec)
{
- char *s = xstrdup(spec);
- char *p;
+ char *s, *p;
int ret = SSH_PROTO_UNKNOWN;
+ if (spec == NULL)
+ return ret;
+ s = xstrdup(spec);
for ((p = strtok(s, SEP)); p; (p = strtok(NULL, SEP))) {
switch(atoi(p)) {
case 1:
diff --git a/kex.c b/kex.c
index 221e0304..199e0426 100644
--- a/kex.c
+++ b/kex.c
@@ -28,13 +28,14 @@
*/
#include "includes.h"
-RCSID("$Id: kex.c,v 1.8 2000/05/09 01:03:01 damien Exp $");
+RCSID("$Id: kex.c,v 1.9 2000/05/30 03:44:53 damien Exp $");
#include "ssh.h"
#include "ssh2.h"
#include "xmalloc.h"
#include "buffer.h"
#include "bufaux.h"
+#include "packet.h"
#include "cipher.h"
#include "compat.h"
@@ -49,15 +50,17 @@ RCSID("$Id: kex.c,v 1.8 2000/05/09 01:03:01 damien Exp $");
#include "kex.h"
+#define KEX_COOKIE_LEN 16
+
Buffer *
kex_init(char *myproposal[PROPOSAL_MAX])
{
- char c = 0;
- unsigned char cookie[16];
+ int first_kex_packet_follows = 0;
+ unsigned char cookie[KEX_COOKIE_LEN];
u_int32_t rand = 0;
int i;
Buffer *ki = xmalloc(sizeof(*ki));
- for (i = 0; i < 16; i++) {
+ for (i = 0; i < KEX_COOKIE_LEN; i++) {
if (i % 4 == 0)
rand = arc4random();
cookie[i] = rand & 0xff;
@@ -67,11 +70,55 @@ kex_init(char *myproposal[PROPOSAL_MAX])
buffer_append(ki, (char *)cookie, sizeof cookie);
for (i = 0; i < PROPOSAL_MAX; i++)
buffer_put_cstring(ki, myproposal[i]);
- buffer_append(ki, &c, 1); /* boolean first_kex_packet_follows */
- buffer_put_int(ki, 0); /* uint32 0 (reserved for future extension) */
+ buffer_put_char(ki, first_kex_packet_follows);
+ buffer_put_int(ki, 0); /* uint32 reserved */
return ki;
}
+/* send kexinit, parse and save reply */
+void
+kex_exchange_kexinit(
+ Buffer *my_kexinit, Buffer *peer_kexint,
+ char *peer_proposal[PROPOSAL_MAX])
+{
+ int i;
+ char *ptr;
+ int plen;
+
+ debug("send KEXINIT");
+ packet_start(SSH2_MSG_KEXINIT);
+ packet_put_raw(buffer_ptr(my_kexinit), buffer_len(my_kexinit));
+ packet_send();
+ packet_write_wait();
+ debug("done");
+
+ /*
+ * read and save raw KEXINIT payload in buffer. this is used during
+ * computation of the session_id and the session keys.
+ */
+ debug("wait KEXINIT");
+ packet_read_expect(&plen, SSH2_MSG_KEXINIT);
+ ptr = packet_get_raw(&plen);
+ buffer_append(peer_kexint, ptr, plen);
+
+ /* parse packet and save algorithm proposal */
+ /* skip cookie */
+ for (i = 0; i < KEX_COOKIE_LEN; i++)
+ packet_get_char();
+ /* extract kex init proposal strings */
+ for (i = 0; i < PROPOSAL_MAX; i++) {
+ peer_proposal[i] = packet_get_string(NULL);
+ debug("got kexinit: %s", peer_proposal[i]);
+ }
+ /* first kex follow / reserved */
+ i = packet_get_char();
+ debug("first kex follow: %d ", i);
+ i = packet_get_int();
+ debug("reserved: %d ", i);
+ packet_done();
+ debug("done");
+}
+
/* diffie-hellman-group1-sha1 */
int
@@ -134,12 +181,6 @@ dh_new_group1()
}
void
-bignum_print(BIGNUM *b)
-{
- BN_print_fp(stderr,b);
-}
-
-void
dump_digest(unsigned char *digest, int len)
{
int i;
@@ -246,10 +287,13 @@ char *
get_match(char *client, char *server)
{
char *sproposals[MAX_PROP];
- char *p;
+ char *c, *s, *p, *ret;
int i, j, nproposals;
- for ((p = strtok(server, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
+ c = xstrdup(client);
+ s = xstrdup(server);
+
+ for ((p = strtok(s, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
if (i < MAX_PROP)
sproposals[i] = p;
else
@@ -257,11 +301,18 @@ get_match(char *client, char *server)
}
nproposals = i;
- for ((p = strtok(client, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
- for (j = 0; j < nproposals; j++)
- if (strcmp(p, sproposals[j]) == 0)
- return xstrdup(p);
+ for ((p = strtok(c, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
+ for (j = 0; j < nproposals; j++) {
+ if (strcmp(p, sproposals[j]) == 0) {
+ ret = xstrdup(p);
+ xfree(c);
+ xfree(s);
+ return ret;
+ }
+ }
}
+ xfree(c);
+ xfree(s);
return NULL;
}
void
@@ -355,7 +406,6 @@ choose_hostkeyalg(Kex *k, char *client, char *server)
Kex *
kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server)
{
- int i;
int mode;
int ctos; /* direction: if true client-to-server */
int need;
@@ -383,10 +433,6 @@ kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server
choose_kex(k, cprop[PROPOSAL_KEX_ALGS], sprop[PROPOSAL_KEX_ALGS]);
choose_hostkeyalg(k, cprop[PROPOSAL_SERVER_HOST_KEY_ALGS],
sprop[PROPOSAL_SERVER_HOST_KEY_ALGS]);
- for (i = 0; i < PROPOSAL_MAX; i++) {
- xfree(cprop[i]);
- xfree(sprop[i]);
- }
need = 0;
for (mode = 0; mode < MODE_MAX; mode++) {
if (need < k->enc[mode].key_len)
@@ -396,9 +442,7 @@ kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server
if (need < k->mac[mode].key_len)
need = k->mac[mode].key_len;
}
- /* need runden? */
-#define WE_NEED 32
- k->we_need = WE_NEED;
+ /* XXX need runden? */
k->we_need = need;
return k;
}
diff --git a/kex.h b/kex.h
index 5395ebc3..7e5c6702 100644
--- a/kex.h
+++ b/kex.h
@@ -91,12 +91,17 @@ struct Kex {
};
Buffer *kex_init(char *myproposal[PROPOSAL_MAX]);
-int dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);
-DH *dh_new_group1();
-Kex *kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server);
+void
+kex_exchange_kexinit(
+ Buffer *my_kexinit, Buffer *peer_kexint,
+ char *peer_proposal[PROPOSAL_MAX]);
+Kex *
+kex_choose_conf(char *cprop[PROPOSAL_MAX],
+ char *sprop[PROPOSAL_MAX], int server);
int kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret);
-void bignum_print(BIGNUM *b);
void packet_set_kex(Kex *k);
+int dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);
+DH *dh_new_group1();
unsigned char *
kex_hash(
diff --git a/key.c b/key.c
index ae355a3f..d474f85c 100644
--- a/key.c
+++ b/key.c
@@ -256,12 +256,14 @@ key_read(Key *ret, char **cpp)
blob = xmalloc(len);
n = uudecode(cp, blob, len);
if (n < 0) {
- error("uudecode %s failed", cp);
+ error("key_read: uudecode %s failed", cp);
return 0;
}
k = dsa_key_from_blob(blob, n);
- if (k == NULL)
- return 0;
+ if (k == NULL) {
+ error("key_read: dsa_key_from_blob %s failed", cp);
+ return 0;
+ }
xfree(blob);
if (ret->dsa != NULL)
DSA_free(ret->dsa);
@@ -269,10 +271,12 @@ key_read(Key *ret, char **cpp)
k->dsa = NULL;
key_free(k);
bits = BN_num_bits(ret->dsa->p);
- cp = strchr(cp, '=');
- if (cp == NULL)
- return 0;
- *cpp = cp + 1;
+ /* advance cp: skip whitespace and data */
+ while (*cp == ' ' || *cp == '\t')
+ cp++;
+ while (*cp != '\0' && *cp != ' ' && *cp != '\t')
+ cp++;
+ *cpp = cp;
break;
default:
fatal("key_read: bad key type: %d", ret->type);
diff --git a/myproposal.h b/myproposal.h
index 8b241797..9611d895 100644
--- a/myproposal.h
+++ b/myproposal.h
@@ -6,7 +6,7 @@
#define KEX_DEFAULT_LANG ""
-static const char *myproposal[PROPOSAL_MAX] = {
+static char *myproposal[PROPOSAL_MAX] = {
KEX_DEFAULT_KEX,
KEX_DEFAULT_PK_ALG,
KEX_DEFAULT_ENCRYPT,
diff --git a/readconf.c b/readconf.c
index 9c5638b0..d7011d7f 100644
--- a/readconf.c
+++ b/readconf.c
@@ -14,7 +14,7 @@
*/
#include "includes.h"
-RCSID("$Id: readconf.c,v 1.14 2000/05/09 01:03:01 damien Exp $");
+RCSID("$Id: readconf.c,v 1.15 2000/05/30 03:44:53 damien Exp $");
#include "ssh.h"
#include "cipher.h"
@@ -464,6 +464,8 @@ parse_int:
case oCipher:
intptr = &options->cipher;
cp = strtok(NULL, WHITESPACE);
+ if (!cp)
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
value = cipher_number(cp);
if (value == -1)
fatal("%.200s line %d: Bad cipher '%s'.",
@@ -474,6 +476,8 @@ parse_int:
case oCiphers:
cp = strtok(NULL, WHITESPACE);
+ if (!cp)
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
if (!ciphers_valid(cp))
fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
filename, linenum, cp ? cp : "<NONE>");
@@ -484,6 +488,8 @@ parse_int:
case oProtocol:
intptr = &options->protocol;
cp = strtok(NULL, WHITESPACE);
+ if (!cp)
+ fatal("%.200s line %d: Missing argument.", filename, linenum);
value = proto_spec(cp);
if (value == SSH_PROTO_UNKNOWN)
fatal("%.200s line %d: Bad protocol spec '%s'.",
@@ -691,7 +697,7 @@ void
fill_default_options(Options * options)
{
if (options->forward_agent == -1)
- options->forward_agent = 1;
+ options->forward_agent = 0;
if (options->forward_x11 == -1)
options->forward_x11 = 0;
if (options->gateway_ports == -1)
diff --git a/servconf.c b/servconf.c
index 05630c76..1aa4fe06 100644
--- a/servconf.c
+++ b/servconf.c
@@ -12,7 +12,7 @@
*/
#include "includes.h"
-RCSID("$Id: servconf.c,v 1.16 2000/05/09 01:03:01 damien Exp $");
+RCSID("$Id: servconf.c,v 1.17 2000/05/30 03:44:53 damien Exp $");
#include "ssh.h"
#include "servconf.h"
@@ -588,6 +588,8 @@ parse_flag:
case sCiphers:
cp = strtok(NULL, WHITESPACE);
+ if (!cp)
+ fatal("%s line %d: Missing argument.", filename, linenum);
if (!ciphers_valid(cp))
fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
filename, linenum, cp ? cp : "<NONE>");
@@ -598,6 +600,8 @@ parse_flag:
case sProtocol:
intptr = &options->protocol;
cp = strtok(NULL, WHITESPACE);
+ if (!cp)
+ fatal("%s line %d: Missing argument.", filename, linenum);
value = proto_spec(cp);
if (value == SSH_PROTO_UNKNOWN)
fatal("%s line %d: Bad protocol spec '%s'.",
diff --git a/serverloop.c b/serverloop.c
index 977ed41f..b08fcfd9 100644
--- a/serverloop.c
+++ b/serverloop.c
@@ -164,33 +164,37 @@ retry_select:
/* Initialize select() masks. */
FD_ZERO(readset);
+ FD_ZERO(writeset);
- /*
- * Read packets from the client unless we have too much buffered
- * stdin or channel data.
- */
if (compat20) {
/* wrong: bad condition XXX */
if (channel_not_very_much_buffered_data())
FD_SET(connection_in, readset);
} else {
- if (buffer_len(&stdin_buffer) < 4096 &&
+ /*
+ * Read packets from the client unless we have too much
+ * buffered stdin or channel data.
+ */
+ if (buffer_len(&stdin_buffer) < buffer_high &&
channel_not_very_much_buffered_data())
FD_SET(connection_in, readset);
+ /*
+ * If there is not too much data already buffered going to
+ * the client, try to get some more data from the program.
+ */
+ if (packet_not_very_much_data_to_write()) {
+ if (!fdout_eof)
+ FD_SET(fdout, readset);
+ if (!fderr_eof)
+ FD_SET(fderr, readset);
+ }
+ /*
+ * If we have buffered data, try to write some of that data
+ * to the program.
+ */
+ if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
+ FD_SET(fdin, writeset);
}
-
- /*
- * If there is not too much data already buffered going to the
- * client, try to get some more data from the program.
- */
- if (!compat20 && packet_not_very_much_data_to_write()) {
- if (!fdout_eof)
- FD_SET(fdout, readset);
- if (!fderr_eof)
- FD_SET(fderr, readset);
- }
- FD_ZERO(writeset);
-
/* Set masks for channel descriptors. */
channel_prepare_select(readset, writeset);
@@ -201,11 +205,6 @@ retry_select:
if (packet_have_data_to_write())
FD_SET(connection_out, writeset);
- /* If we have buffered data, try to write some of that data to the
- program. */
- if (!compat20 && fdin != -1 && buffer_len(&stdin_buffer) > 0)
- FD_SET(fdin, writeset);
-
/* Update the maximum descriptor number if appropriate. */
if (channel_max_fd() > max_fd)
max_fd = channel_max_fd();
@@ -377,6 +376,7 @@ process_buffered_input_packets()
void
server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
{
+ fd_set readset, writeset;
int wait_status; /* Status returned by wait(). */
pid_t wait_pid; /* pid returned by wait(). */
int waiting_termination = 0; /* Have displayed waiting close message. */
@@ -445,7 +445,6 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
/* Main loop of the server for the interactive session mode. */
for (;;) {
- fd_set readset, writeset;
/* Process buffered packets from the client. */
process_buffered_input_packets();
@@ -717,6 +716,9 @@ input_direct_tcpip(void)
originator = packet_get_string(NULL);
originator_port = packet_get_int();
packet_done();
+
+ debug("open direct-tcpip: from %s port %d to %s port %d",
+ originator, originator_port, target, target_port);
/* XXX check permission */
sock = channel_connect_to(target, target_port);
xfree(target);
@@ -768,7 +770,6 @@ server_input_channel_open(int type, int plen)
channel_free(id);
}
} else if (strcmp(ctype, "direct-tcpip") == 0) {
- debug("open direct-tcpip");
id = input_direct_tcpip();
if (id >= 0)
c = channel_lookup(id);
diff --git a/session.c b/session.c
index 4b7404f7..4791857c 100644
--- a/session.c
+++ b/session.c
@@ -8,7 +8,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.12 2000/05/03 18:03:07 markus Exp $");
+RCSID("$OpenBSD: session.c,v 1.14 2000/05/25 03:10:18 deraadt Exp $");
#include "xmalloc.h"
#include "ssh.h"
@@ -645,7 +645,8 @@ do_exec_pty(Session *s, const char *command, struct passwd * pw)
}
#endif
/* Do common processing for the child, such as execing the command. */
- do_child(command, pw, s->term, s->display, s->auth_proto, s->auth_data, s->tty);
+ do_child(command, pw, s->term, s->display, s->auth_proto,
+ s->auth_data, s->tty);
/* NOTREACHED */
}
if (pid < 0)
@@ -749,7 +750,10 @@ read_environment_file(char ***env, unsigned int *envsize,
fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
continue;
}
- /* Replace the equals sign by nul, and advance value to the value string. */
+ /*
+ * Replace the equals sign by nul, and advance value to
+ * the value string.
+ */
*value = '\0';
value++;
child_set_env(env, envsize, cp, value);
@@ -948,7 +952,8 @@ do_child(const char *command, struct passwd * pw, const char *term,
/* read $HOME/.ssh/environment. */
if (!options.use_login) {
- snprintf(buf, sizeof buf, "%.200s/.ssh/environment", pw->pw_dir);
+ snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
+ pw->pw_dir);
read_environment_file(&env, &envsize, buf);
}
if (debug_flag) {
@@ -1037,21 +1042,27 @@ do_child(const char *command, struct passwd * pw, const char *term,
if (auth_proto != NULL && auth_data != NULL) {
char *screen = strchr(display, ':');
if (debug_flag) {
- fprintf(stderr, "Running %.100s add %.100s %.100s %.100s\n",
+ fprintf(stderr,
+ "Running %.100s add %.100s %.100s %.100s\n",
XAUTH_PATH, display, auth_proto, auth_data);
if (screen != NULL)
- fprintf(stderr, "Adding %.*s/unix%s %s %s\n",
- screen-display, display, screen, auth_proto, auth_data);
+ fprintf(stderr,
+ "Adding %.*s/unix%s %s %s\n",
+ screen-display, display,
+ screen, auth_proto, auth_data);
}
f = popen(XAUTH_PATH " -q -", "w");
if (f) {
- fprintf(f, "add %s %s %s\n", display, auth_proto, auth_data);
+ fprintf(f, "add %s %s %s\n", display,
+ auth_proto, auth_data);
if (screen != NULL)
fprintf(f, "add %.*s/unix%s %s %s\n",
- screen-display, display, screen, auth_proto, auth_data);
+ screen-display, display,
+ screen, auth_proto, auth_data);
pclose(f);
} else
- fprintf(stderr, "Could not run %s -q -\n", XAUTH_PATH);
+ fprintf(stderr, "Could not run %s -q -\n",
+ XAUTH_PATH);
}
}
#endif /* XAUTH_PATH */
@@ -1081,7 +1092,8 @@ do_child(const char *command, struct passwd * pw, const char *term,
struct stat mailstat;
mailbox = getenv("MAIL");
if (mailbox != NULL) {
- if (stat(mailbox, &mailstat) != 0 || mailstat.st_size == 0)
+ if (stat(mailbox, &mailstat) != 0 ||
+ mailstat.st_size == 0)
printf("No mail.\n");
else if (mailstat.st_mtime < mailstat.st_atime)
printf("You have mail.\n");
diff --git a/ssh.1 b/ssh.1
index d8e9eb0b..6c1d3763 100644
--- a/ssh.1
+++ b/ssh.1
@@ -9,7 +9,7 @@
.\"
.\" Created: Sat Apr 22 21:55:14 1995 ylo
.\"
-.\" $Id: ssh.1,v 1.26 2000/05/17 12:34:24 damien Exp $
+.\" $Id: ssh.1,v 1.27 2000/05/30 03:44:54 damien Exp $
.\"
.Dd September 25, 1999
.Dt SSH 1
@@ -24,7 +24,7 @@
.Op Ar command
.Pp
.Nm ssh
-.Op Fl afgknqtvxCNPTX246
+.Op Fl afgknqtvxACNPTX246
.Op Fl c Ar cipher_spec
.Op Fl e Ar escape_char
.Op Fl i Ar identity_file
@@ -332,7 +332,9 @@ host key is not known or has changed.
.Bl -tag -width Ds
.It Fl a
Disables forwarding of the authentication agent connection.
-This may also be specified on a per-host basis in the configuration file.
+.It Fl A
+Enables forwarding of the authentication agent connection.
+This can also be specified on a per-host basis in a configuration file.
.It Fl c Ar blowfish|3des
Selects the cipher to use for encrypting the session.
.Ar 3des
@@ -460,9 +462,9 @@ The verbose mode is also used to display
challenges, if the user entered "s/key" as password.
.It Fl x
Disables X11 forwarding.
-This can also be specified on a per-host basis in a configuration file.
.It Fl X
Enables X11 forwarding.
+This can also be specified on a per-host basis in a configuration file.
.It Fl C
Requests compression of all data (including stdin, stdout, stderr, and
data for forwarded X11 and TCP/IP connections).
@@ -671,6 +673,8 @@ The argument must be
.Dq yes
or
.Dq no .
+The default is
+.Dq no .
.It Cm ForwardX11
Specifies whether X11 connections will be automatically redirected
over the secure channel and
diff --git a/ssh.c b/ssh.c
index 1cc8dbbf..2934c3a4 100644
--- a/ssh.c
+++ b/ssh.c
@@ -11,7 +11,7 @@
*/
#include "includes.h"
-RCSID("$Id: ssh.c,v 1.32 2000/05/20 05:22:37 damien Exp $");
+RCSID("$Id: ssh.c,v 1.33 2000/05/30 03:44:54 damien Exp $");
#include <openssl/evp.h>
#include <openssl/dsa.h>
@@ -116,6 +116,7 @@ usage()
fprintf(stderr, "Options:\n");
fprintf(stderr, " -l user Log in using this user name.\n");
fprintf(stderr, " -n Redirect input from /dev/null.\n");
+ fprintf(stderr, " -A Enable authentication agent forwarding.\n");
fprintf(stderr, " -a Disable authentication agent forwarding.\n");
#ifdef AFS
fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
@@ -315,6 +316,9 @@ main(int ac, char **av)
case 'a':
options.forward_agent = 0;
break;
+ case 'A':
+ options.forward_agent = 1;
+ break;
#ifdef AFS
case 'k':
options.kerberos_tgt_passing = 0;
diff --git a/sshconnect2.c b/sshconnect2.c
index 99ffb2c4..0abcf89a 100644
--- a/sshconnect2.c
+++ b/sshconnect2.c
@@ -28,7 +28,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: sshconnect2.c,v 1.10 2000/05/08 17:42:25 markus Exp $");
+RCSID("$OpenBSD: sshconnect2.c,v 1.11 2000/05/25 20:45:20 markus Exp $");
#include <openssl/bn.h>
#include <openssl/rsa.h>
@@ -68,16 +68,12 @@ unsigned char *session_id2 = NULL;
int session_id2_len = 0;
void
-ssh_kex2(char *host, struct sockaddr *hostaddr)
+ssh_kex_dh(Kex *kex, char *host, struct sockaddr *hostaddr,
+ Buffer *client_kexinit, Buffer *server_kexinit)
{
- Kex *kex;
- char *cprop[PROPOSAL_MAX];
- char *sprop[PROPOSAL_MAX];
- Buffer *client_kexinit;
- Buffer *server_kexinit;
- int payload_len, dlen;
+ int i;
+ int plen, dlen;
unsigned int klen, kout;
- char *ptr;
char *signature = NULL;
unsigned int slen;
char *server_host_key_blob = NULL;
@@ -86,72 +82,10 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
DH *dh;
BIGNUM *dh_server_pub = 0;
BIGNUM *shared_secret = 0;
- int i;
unsigned char *kbuf;
unsigned char *hash;
-/* KEXINIT */
-
- debug("Sending KEX init.");
- if (options.ciphers != NULL) {
- myproposal[PROPOSAL_ENC_ALGS_CTOS] =
- myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
- } else if (options.cipher == SSH_CIPHER_3DES) {
- myproposal[PROPOSAL_ENC_ALGS_CTOS] =
- myproposal[PROPOSAL_ENC_ALGS_STOC] =
- cipher_name(SSH_CIPHER_3DES_CBC);
- } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
- myproposal[PROPOSAL_ENC_ALGS_CTOS] =
- myproposal[PROPOSAL_ENC_ALGS_STOC] =
- cipher_name(SSH_CIPHER_BLOWFISH_CBC);
- }
- if (options.compression) {
- myproposal[PROPOSAL_COMP_ALGS_CTOS] = "zlib";
- myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib";
- } else {
- myproposal[PROPOSAL_COMP_ALGS_CTOS] = "none";
- myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
- }
- for (i = 0; i < PROPOSAL_MAX; i++)
- cprop[i] = xstrdup(myproposal[i]);
-
- client_kexinit = kex_init(cprop);
- packet_start(SSH2_MSG_KEXINIT);
- packet_put_raw(buffer_ptr(client_kexinit), buffer_len(client_kexinit));
- packet_send();
- packet_write_wait();
-
- debug("done");
-
- packet_read_expect(&payload_len, SSH2_MSG_KEXINIT);
-
- /* save payload for session_id */
- server_kexinit = xmalloc(sizeof(*server_kexinit));
- buffer_init(server_kexinit);
- ptr = packet_get_raw(&payload_len);
- buffer_append(server_kexinit, ptr, payload_len);
-
- /* skip cookie */
- for (i = 0; i < 16; i++)
- (void) packet_get_char();
- /* kex init proposal strings */
- for (i = 0; i < PROPOSAL_MAX; i++) {
- sprop[i] = packet_get_string(NULL);
- debug("got kexinit string: %s", sprop[i]);
- }
- i = (int) packet_get_char();
- debug("first kex follow == %d", i);
- i = packet_get_int();
- debug("reserved == %d", i);
- packet_done();
-
- debug("done read kexinit");
- kex = kex_choose_conf(cprop, sprop, 0);
-
-/* KEXDH */
-
debug("Sending SSH2_MSG_KEXDH_INIT.");
-
/* generate and send 'e', client DH public key */
dh = dh_new_group1();
packet_start(SSH2_MSG_KEXDH_INIT);
@@ -172,7 +106,7 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
debug("Wait SSH2_MSG_KEXDH_REPLY.");
- packet_read_expect(&payload_len, SSH2_MSG_KEXDH_REPLY);
+ packet_read_expect(&plen, SSH2_MSG_KEXDH_REPLY);
debug("Got SSH2_MSG_KEXDH_REPLY.");
@@ -233,10 +167,7 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
shared_secret
);
xfree(server_host_key_blob);
- buffer_free(client_kexinit);
- buffer_free(server_kexinit);
- xfree(client_kexinit);
- xfree(server_kexinit);
+ DH_free(dh);
#ifdef DEBUG_KEXDH
fprintf(stderr, "hash == ");
for (i = 0; i< 20; i++)
@@ -250,16 +181,61 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
kex_derive_keys(kex, hash, shared_secret);
packet_set_kex(kex);
- /* have keys, free DH */
- DH_free(dh);
-
/* save session id */
session_id2_len = 20;
session_id2 = xmalloc(session_id2_len);
memcpy(session_id2, hash, session_id2_len);
+}
+
+void
+ssh_kex2(char *host, struct sockaddr *hostaddr)
+{
+ int i, plen;
+ Kex *kex;
+ Buffer *client_kexinit, *server_kexinit;
+ char *sprop[PROPOSAL_MAX];
+
+ if (options.ciphers != NULL) {
+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+ myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
+ } else if (options.cipher == SSH_CIPHER_3DES) {
+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+ myproposal[PROPOSAL_ENC_ALGS_STOC] =
+ (char *) cipher_name(SSH_CIPHER_3DES_CBC);
+ } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+ myproposal[PROPOSAL_ENC_ALGS_STOC] =
+ (char *) cipher_name(SSH_CIPHER_BLOWFISH_CBC);
+ }
+ if (options.compression) {
+ myproposal[PROPOSAL_COMP_ALGS_CTOS] = "zlib";
+ myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib";
+ } else {
+ myproposal[PROPOSAL_COMP_ALGS_CTOS] = "none";
+ myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
+ }
+
+ /* buffers with raw kexinit messages */
+ server_kexinit = xmalloc(sizeof(*server_kexinit));
+ buffer_init(server_kexinit);
+ client_kexinit = kex_init(myproposal);
+
+ /* algorithm negotiation */
+ kex_exchange_kexinit(client_kexinit, server_kexinit, sprop);
+ kex = kex_choose_conf(myproposal, sprop, 0);
+ for (i = 0; i < PROPOSAL_MAX; i++)
+ xfree(sprop[i]);
+
+ /* server authentication and session key agreement */
+ ssh_kex_dh(kex, host, hostaddr, client_kexinit, server_kexinit);
+
+ buffer_free(client_kexinit);
+ buffer_free(server_kexinit);
+ xfree(client_kexinit);
+ xfree(server_kexinit);
debug("Wait SSH2_MSG_NEWKEYS.");
- packet_read_expect(&payload_len, SSH2_MSG_NEWKEYS);
+ packet_read_expect(&plen, SSH2_MSG_NEWKEYS);
packet_done();
debug("GOT SSH2_MSG_NEWKEYS.");
@@ -278,6 +254,7 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
#endif
debug("done: KEX2.");
}
+
/*
* Authenticate user
*/
diff --git a/sshd.c b/sshd.c
index 39fbcba4..ec860024 100644
--- a/sshd.c
+++ b/sshd.c
@@ -14,7 +14,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: sshd.c,v 1.117 2000/05/18 13:27:36 djm Exp $");
+RCSID("$OpenBSD: sshd.c,v 1.118 2000/05/25 20:45:20 markus Exp $");
#include "xmalloc.h"
#include "rsa.h"
@@ -1159,7 +1159,6 @@ do_ssh2_kex()
int payload_len, dlen;
int slen;
unsigned int klen, kout;
- char *ptr;
unsigned char *signature = NULL;
unsigned char *server_host_key_blob = NULL;
unsigned int sbloblen;
@@ -1171,7 +1170,6 @@ do_ssh2_kex()
unsigned char *hash;
Kex *kex;
char *cprop[PROPOSAL_MAX];
- char *sprop[PROPOSAL_MAX];
/* KEXINIT */
@@ -1179,46 +1177,15 @@ do_ssh2_kex()
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
}
-
- debug("Sending KEX init.");
-
- for (i = 0; i < PROPOSAL_MAX; i++)
- sprop[i] = xstrdup(myproposal[i]);
- server_kexinit = kex_init(sprop);
- packet_start(SSH2_MSG_KEXINIT);
- packet_put_raw(buffer_ptr(server_kexinit), buffer_len(server_kexinit));
- packet_send();
- packet_write_wait();
-
- debug("done");
-
- packet_read_expect(&payload_len, SSH2_MSG_KEXINIT);
-
- /*
- * save raw KEXINIT payload in buffer. this is used during
- * computation of the session_id and the session keys.
- */
+ server_kexinit = kex_init(myproposal);
client_kexinit = xmalloc(sizeof(*client_kexinit));
buffer_init(client_kexinit);
- ptr = packet_get_raw(&payload_len);
- buffer_append(client_kexinit, ptr, payload_len);
- /* skip cookie */
- for (i = 0; i < 16; i++)
- (void) packet_get_char();
- /* save kex init proposal strings */
- for (i = 0; i < PROPOSAL_MAX; i++) {
- cprop[i] = packet_get_string(NULL);
- debug("got kexinit string: %s", cprop[i]);
- }
-
- i = (int) packet_get_char();
- debug("first kex follow == %d", i);
- i = packet_get_int();
- debug("reserved == %d", i);
-
- debug("done read kexinit");
- kex = kex_choose_conf(cprop, sprop, 1);
+ /* algorithm negotiation */
+ kex_exchange_kexinit(server_kexinit, client_kexinit, cprop);
+ kex = kex_choose_conf(cprop, myproposal, 1);
+ for (i = 0; i < PROPOSAL_MAX; i++)
+ xfree(cprop[i]);
/* KEXDH */