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authormarkus@openbsd.org <markus@openbsd.org>2015-01-19 19:52:16 +0000
committerDamien Miller <djm@mindrot.org>2015-01-20 09:13:01 +1100
commit091c302829210c41e7f57c3f094c7b9c054306f0 (patch)
tree800de5dc85b877a85d1f269ae5bb09b0dc3fa7a7 /packet.c
parent4e62cc68ce4ba20245d208b252e74e91d3785b74 (diff)
upstream commit
update packet.c & isolate, introduce struct ssh a) switch packet.c to buffer api and isolate per-connection info into struct ssh b) (de)serialization of the state is moved from monitor to packet.c c) the old packet.c API is implemented in opacket.[ch] d) compress.c/h is removed and integrated into packet.c with and ok djm@
Diffstat (limited to 'packet.c')
-rw-r--r--packet.c2675
1 files changed, 1692 insertions, 983 deletions
diff --git a/packet.c b/packet.c
index d6f9ff36..3306e4d6 100644
--- a/packet.c
+++ b/packet.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.c,v 1.200 2015/01/13 19:31:40 markus Exp $ */
+/* $OpenBSD: packet.c,v 1.201 2015/01/19 19:52:16 markus Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -60,17 +60,19 @@
#include <signal.h>
#include <time.h>
+#include <zlib.h>
+
+#include "buffer.h" /* typedefs XXX */
+#include "key.h" /* typedefs XXX */
+
#include "xmalloc.h"
-#include "buffer.h"
-#include "packet.h"
#include "crc32.h"
-#include "compress.h"
#include "deattack.h"
#include "compat.h"
#include "ssh1.h"
#include "ssh2.h"
#include "cipher.h"
-#include "key.h"
+#include "sshkey.h"
#include "kex.h"
#include "digest.h"
#include "mac.h"
@@ -79,8 +81,10 @@
#include "misc.h"
#include "channels.h"
#include "ssh.h"
-#include "ssherr.h"
+#include "packet.h"
#include "roaming.h"
+#include "ssherr.h"
+#include "sshbuf.h"
#ifdef PACKET_DEBUG
#define DBG(x) x
@@ -100,7 +104,7 @@ struct packet_state {
struct packet {
TAILQ_ENTRY(packet) next;
u_char type;
- Buffer payload;
+ struct sshbuf *payload;
};
struct session_state {
@@ -117,26 +121,33 @@ struct session_state {
u_int remote_protocol_flags;
/* Encryption context for receiving data. Only used for decryption. */
- CipherContext receive_context;
+ struct sshcipher_ctx receive_context;
/* Encryption context for sending data. Only used for encryption. */
- CipherContext send_context;
+ struct sshcipher_ctx send_context;
/* Buffer for raw input data from the socket. */
- Buffer input;
+ struct sshbuf *input;
/* Buffer for raw output data going to the socket. */
- Buffer output;
+ struct sshbuf *output;
/* Buffer for the partial outgoing packet being constructed. */
- Buffer outgoing_packet;
+ struct sshbuf *outgoing_packet;
/* Buffer for the incoming packet currently being processed. */
- Buffer incoming_packet;
+ struct sshbuf *incoming_packet;
/* Scratch buffer for packet compression/decompression. */
- Buffer compression_buffer;
- int compression_buffer_ready;
+ struct sshbuf *compression_buffer;
+
+ /* Incoming/outgoing compression dictionaries */
+ z_stream compression_in_stream;
+ z_stream compression_out_stream;
+ int compression_in_started;
+ int compression_out_started;
+ int compression_in_failures;
+ int compression_out_failures;
/*
* Flag indicating whether packet compression/decompression is
@@ -165,7 +176,7 @@ struct session_state {
int packet_timeout_ms;
/* Session key information for Encryption and MAC */
- Newkeys *newkeys[MODE_MAX];
+ struct newkeys *newkeys[MODE_MAX];
struct packet_state p_read, p_send;
/* Volume-based rekeying */
@@ -185,7 +196,7 @@ struct session_state {
/* XXX discard incoming data after MAC error */
u_int packet_discard;
- Mac *packet_discard_mac;
+ struct sshmac *packet_discard_mac;
/* Used in packet_read_poll2() */
u_int packlen;
@@ -199,121 +210,164 @@ struct session_state {
/* Used in packet_set_maxsize */
int set_maxsize_called;
- TAILQ_HEAD(, packet) outgoing;
-};
+ /* One-off warning about weak ciphers */
+ int cipher_warning_done;
-static struct session_state *active_state, *backup_state;
+ /* SSH1 CRC compensation attack detector */
+ struct deattack_ctx deattack;
-static struct session_state *
-alloc_session_state(void)
-{
- struct session_state *s = xcalloc(1, sizeof(*s));
+ TAILQ_HEAD(, packet) outgoing;
+};
- s->connection_in = -1;
- s->connection_out = -1;
- s->max_packet_size = 32768;
- s->packet_timeout_ms = -1;
- return s;
+struct ssh *
+ssh_alloc_session_state(void)
+{
+ struct ssh *ssh = NULL;
+ struct session_state *state = NULL;
+
+ if ((ssh = calloc(1, sizeof(*ssh))) == NULL ||
+ (state = calloc(1, sizeof(*state))) == NULL ||
+ (state->input = sshbuf_new()) == NULL ||
+ (state->output = sshbuf_new()) == NULL ||
+ (state->outgoing_packet = sshbuf_new()) == NULL ||
+ (state->incoming_packet = sshbuf_new()) == NULL)
+ goto fail;
+ TAILQ_INIT(&state->outgoing);
+ state->connection_in = -1;
+ state->connection_out = -1;
+ state->max_packet_size = 32768;
+ state->packet_timeout_ms = -1;
+ state->p_send.packets = state->p_read.packets = 0;
+ state->initialized = 1;
+ /*
+ * ssh_packet_send2() needs to queue packets until
+ * we've done the initial key exchange.
+ */
+ state->rekeying = 1;
+ ssh->state = state;
+ return ssh;
+ fail:
+ if (state) {
+ sshbuf_free(state->input);
+ sshbuf_free(state->output);
+ sshbuf_free(state->incoming_packet);
+ sshbuf_free(state->outgoing_packet);
+ free(state);
+ }
+ free(ssh);
+ return NULL;
}
/*
* Sets the descriptors used for communication. Disables encryption until
* packet_set_encryption_key is called.
*/
-void
-packet_set_connection(int fd_in, int fd_out)
+struct ssh *
+ssh_packet_set_connection(struct ssh *ssh, int fd_in, int fd_out)
{
- const Cipher *none = cipher_by_name("none");
+ struct session_state *state;
+ const struct sshcipher *none = cipher_by_name("none");
int r;
if (none == NULL)
- fatal("packet_set_connection: cannot load cipher 'none'");
- if (active_state == NULL)
- active_state = alloc_session_state();
- active_state->connection_in = fd_in;
- active_state->connection_out = fd_out;
- if ((r = cipher_init(&active_state->send_context, none,
+ fatal("%s: cannot load cipher 'none'", __func__);
+ if (ssh == NULL)
+ ssh = ssh_alloc_session_state();
+ if (ssh == NULL)
+ fatal("%s: cound not allocate state", __func__);
+ state = ssh->state;
+ state->connection_in = fd_in;
+ state->connection_out = fd_out;
+ if ((r = cipher_init(&state->send_context, none,
(const u_char *)"", 0, NULL, 0, CIPHER_ENCRYPT)) != 0 ||
- (r = cipher_init(&active_state->receive_context, none,
+ (r = cipher_init(&state->receive_context, none,
(const u_char *)"", 0, NULL, 0, CIPHER_DECRYPT)) != 0)
- fatal("%s: cipher_init: %s", __func__, ssh_err(r));
- active_state->newkeys[MODE_IN] = active_state->newkeys[MODE_OUT] = NULL;
- if (!active_state->initialized) {
- active_state->initialized = 1;
- buffer_init(&active_state->input);
- buffer_init(&active_state->output);
- buffer_init(&active_state->outgoing_packet);
- buffer_init(&active_state->incoming_packet);
- TAILQ_INIT(&active_state->outgoing);
- active_state->p_send.packets = active_state->p_read.packets = 0;
- }
+ fatal("%s: cipher_init failed: %s", __func__, ssh_err(r));
+ state->newkeys[MODE_IN] = state->newkeys[MODE_OUT] = NULL;
+ deattack_init(&state->deattack);
+ return ssh;
}
void
-packet_set_timeout(int timeout, int count)
+ssh_packet_set_timeout(struct ssh *ssh, int timeout, int count)
{
+ struct session_state *state = ssh->state;
+
if (timeout <= 0 || count <= 0) {
- active_state->packet_timeout_ms = -1;
+ state->packet_timeout_ms = -1;
return;
}
if ((INT_MAX / 1000) / count < timeout)
- active_state->packet_timeout_ms = INT_MAX;
+ state->packet_timeout_ms = INT_MAX;
else
- active_state->packet_timeout_ms = timeout * count * 1000;
+ state->packet_timeout_ms = timeout * count * 1000;
}
-static void
-packet_stop_discard(void)
+int
+ssh_packet_stop_discard(struct ssh *ssh)
{
- if (active_state->packet_discard_mac) {
+ struct session_state *state = ssh->state;
+ int r;
+
+ if (state->packet_discard_mac) {
char buf[1024];
-
+
memset(buf, 'a', sizeof(buf));
- while (buffer_len(&active_state->incoming_packet) <
+ while (sshbuf_len(state->incoming_packet) <
PACKET_MAX_SIZE)
- buffer_append(&active_state->incoming_packet, buf,
- sizeof(buf));
- (void) mac_compute(active_state->packet_discard_mac,
- active_state->p_read.seqnr,
- buffer_ptr(&active_state->incoming_packet),
- PACKET_MAX_SIZE, NULL, 0);
- }
- logit("Finished discarding for %.200s", get_remote_ipaddr());
- cleanup_exit(255);
+ if ((r = sshbuf_put(state->incoming_packet, buf,
+ sizeof(buf))) != 0)
+ return r;
+ (void) mac_compute(state->packet_discard_mac,
+ state->p_read.seqnr,
+ sshbuf_ptr(state->incoming_packet), PACKET_MAX_SIZE,
+ NULL, 0);
+ }
+ logit("Finished discarding for %.200s", ssh_remote_ipaddr(ssh));
+ return SSH_ERR_MAC_INVALID;
}
-static void
-packet_start_discard(Enc *enc, Mac *mac, u_int packet_length, u_int discard)
+static int
+ssh_packet_start_discard(struct ssh *ssh, struct sshenc *enc,
+ struct sshmac *mac, u_int packet_length, u_int discard)
{
- if (enc == NULL || !cipher_is_cbc(enc->cipher) || (mac && mac->etm))
- packet_disconnect("Packet corrupt");
+ struct session_state *state = ssh->state;
+ int r;
+
+ if (enc == NULL || !cipher_is_cbc(enc->cipher) || (mac && mac->etm)) {
+ if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0)
+ return r;
+ return SSH_ERR_MAC_INVALID;
+ }
if (packet_length != PACKET_MAX_SIZE && mac && mac->enabled)
- active_state->packet_discard_mac = mac;
- if (buffer_len(&active_state->input) >= discard)
- packet_stop_discard();
- active_state->packet_discard = discard -
- buffer_len(&active_state->input);
+ state->packet_discard_mac = mac;
+ if (sshbuf_len(state->input) >= discard &&
+ (r = ssh_packet_stop_discard(ssh)) != 0)
+ return r;
+ state->packet_discard = discard - sshbuf_len(state->input);
+ return 0;
}
/* Returns 1 if remote host is connected via socket, 0 if not. */
int
-packet_connection_is_on_socket(void)
+ssh_packet_connection_is_on_socket(struct ssh *ssh)
{
+ struct session_state *state = ssh->state;
struct sockaddr_storage from, to;
socklen_t fromlen, tolen;
/* filedescriptors in and out are the same, so it's a socket */
- if (active_state->connection_in == active_state->connection_out)
+ if (state->connection_in == state->connection_out)
return 1;
fromlen = sizeof(from);
memset(&from, 0, sizeof(from));
- if (getpeername(active_state->connection_in, (struct sockaddr *)&from,
+ if (getpeername(state->connection_in, (struct sockaddr *)&from,
&fromlen) < 0)
return 0;
tolen = sizeof(to);
memset(&to, 0, sizeof(to));
- if (getpeername(active_state->connection_out, (struct sockaddr *)&to,
+ if (getpeername(state->connection_out, (struct sockaddr *)&to,
&tolen) < 0)
return 0;
if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0)
@@ -323,127 +377,23 @@ packet_connection_is_on_socket(void)
return 1;
}
-/*
- * Exports an IV from the CipherContext required to export the key
- * state back from the unprivileged child to the privileged parent
- * process.
- */
-
-void
-packet_get_keyiv(int mode, u_char *iv, u_int len)
-{
- CipherContext *cc;
- int r;
-
- if (mode == MODE_OUT)
- cc = &active_state->send_context;
- else
- cc = &active_state->receive_context;
-
- if ((r = cipher_get_keyiv(cc, iv, len)) != 0)
- fatal("%s: cipher_get_keyiv: %s", __func__, ssh_err(r));
-}
-
-int
-packet_get_keycontext(int mode, u_char *dat)
-{
- CipherContext *cc;
-
- if (mode == MODE_OUT)
- cc = &active_state->send_context;
- else
- cc = &active_state->receive_context;
-
- return (cipher_get_keycontext(cc, dat));
-}
-
void
-packet_set_keycontext(int mode, u_char *dat)
+ssh_packet_get_bytes(struct ssh *ssh, u_int64_t *ibytes, u_int64_t *obytes)
{
- CipherContext *cc;
-
- if (mode == MODE_OUT)
- cc = &active_state->send_context;
- else
- cc = &active_state->receive_context;
-
- cipher_set_keycontext(cc, dat);
+ if (ibytes)
+ *ibytes = ssh->state->p_read.bytes;
+ if (obytes)
+ *obytes = ssh->state->p_send.bytes;
}
int
-packet_get_keyiv_len(int mode)
-{
- CipherContext *cc;
-
- if (mode == MODE_OUT)
- cc = &active_state->send_context;
- else
- cc = &active_state->receive_context;
-
- return (cipher_get_keyiv_len(cc));
-}
-
-void
-packet_set_iv(int mode, u_char *dat)
-{
- CipherContext *cc;
- int r;
-
- if (mode == MODE_OUT)
- cc = &active_state->send_context;
- else
- cc = &active_state->receive_context;
-
- if ((r = cipher_set_keyiv(cc, dat)) != 0)
- fatal("%s: cipher_set_keyiv: %s", __func__, ssh_err(r));
-}
-
-int
-packet_get_ssh1_cipher(void)
-{
- return (cipher_get_number(active_state->receive_context.cipher));
-}
-
-void
-packet_get_state(int mode, u_int32_t *seqnr, u_int64_t *blocks,
- u_int32_t *packets, u_int64_t *bytes)
-{
- struct packet_state *state;
-
- state = (mode == MODE_IN) ?
- &active_state->p_read : &active_state->p_send;
- if (seqnr)
- *seqnr = state->seqnr;
- if (blocks)
- *blocks = state->blocks;
- if (packets)
- *packets = state->packets;
- if (bytes)
- *bytes = state->bytes;
-}
-
-void
-packet_set_state(int mode, u_int32_t seqnr, u_int64_t blocks, u_int32_t packets,
- u_int64_t bytes)
-{
- struct packet_state *state;
-
- state = (mode == MODE_IN) ?
- &active_state->p_read : &active_state->p_send;
- state->seqnr = seqnr;
- state->blocks = blocks;
- state->packets = packets;
- state->bytes = bytes;
-}
-
-static int
-packet_connection_af(void)
+ssh_packet_connection_af(struct ssh *ssh)
{
struct sockaddr_storage to;
socklen_t tolen = sizeof(to);
memset(&to, 0, sizeof(to));
- if (getsockname(active_state->connection_out, (struct sockaddr *)&to,
+ if (getsockname(ssh->state->connection_out, (struct sockaddr *)&to,
&tolen) < 0)
return 0;
#ifdef IPV4_IN_IPV6
@@ -457,72 +407,125 @@ packet_connection_af(void)
/* Sets the connection into non-blocking mode. */
void
-packet_set_nonblocking(void)
+ssh_packet_set_nonblocking(struct ssh *ssh)
{
/* Set the socket into non-blocking mode. */
- set_nonblock(active_state->connection_in);
+ set_nonblock(ssh->state->connection_in);
- if (active_state->connection_out != active_state->connection_in)
- set_nonblock(active_state->connection_out);
+ if (ssh->state->connection_out != ssh->state->connection_in)
+ set_nonblock(ssh->state->connection_out);
}
/* Returns the socket used for reading. */
int
-packet_get_connection_in(void)
+ssh_packet_get_connection_in(struct ssh *ssh)
{
- return active_state->connection_in;
+ return ssh->state->connection_in;
}
/* Returns the descriptor used for writing. */
int
-packet_get_connection_out(void)
+ssh_packet_get_connection_out(struct ssh *ssh)
+{
+ return ssh->state->connection_out;
+}
+
+/*
+ * Returns the IP-address of the remote host as a string. The returned
+ * string must not be freed.
+ */
+
+const char *
+ssh_remote_ipaddr(struct ssh *ssh)
{
- return active_state->connection_out;
+ /* Check whether we have cached the ipaddr. */
+ if (ssh->remote_ipaddr == NULL)
+ ssh->remote_ipaddr = ssh_packet_connection_is_on_socket(ssh) ?
+ get_peer_ipaddr(ssh->state->connection_in) :
+ strdup("UNKNOWN");
+ if (ssh->remote_ipaddr == NULL)
+ return "UNKNOWN";
+ return ssh->remote_ipaddr;
}
/* Closes the connection and clears and frees internal data structures. */
void
-packet_close(void)
+ssh_packet_close(struct ssh *ssh)
{
- if (!active_state->initialized)
+ struct session_state *state = ssh->state;
+ int r;
+ u_int mode;
+
+ if (!state->initialized)
return;
- active_state->initialized = 0;
- if (active_state->connection_in == active_state->connection_out) {
- shutdown(active_state->connection_out, SHUT_RDWR);
- close(active_state->connection_out);
+ state->initialized = 0;
+ if (state->connection_in == state->connection_out) {
+ shutdown(state->connection_out, SHUT_RDWR);
+ close(state->connection_out);
} else {
- close(active_state->connection_in);
- close(active_state->connection_out);
+ close(state->connection_in);
+ close(state->connection_out);
+ }
+ sshbuf_free(state->input);
+ sshbuf_free(state->output);
+ sshbuf_free(state->outgoing_packet);
+ sshbuf_free(state->incoming_packet);
+ for (mode = 0; mode < MODE_MAX; mode++)
+ kex_free_newkeys(state->newkeys[mode]);
+ if (state->compression_buffer) {
+ sshbuf_free(state->compression_buffer);
+ if (state->compression_out_started) {
+ z_streamp stream = &state->compression_out_stream;
+ debug("compress outgoing: "
+ "raw data %llu, compressed %llu, factor %.2f",
+ (unsigned long long)stream->total_in,
+ (unsigned long long)stream->total_out,
+ stream->total_in == 0 ? 0.0 :
+ (double) stream->total_out / stream->total_in);
+ if (state->compression_out_failures == 0)
+ deflateEnd(stream);
+ }
+ if (state->compression_in_started) {
+ z_streamp stream = &state->compression_out_stream;
+ debug("compress incoming: "
+ "raw data %llu, compressed %llu, factor %.2f",
+ (unsigned long long)stream->total_out,
+ (unsigned long long)stream->total_in,
+ stream->total_out == 0 ? 0.0 :
+ (double) stream->total_in / stream->total_out);
+ if (state->compression_in_failures == 0)
+ inflateEnd(stream);
+ }
}
- buffer_free(&active_state->input);
- buffer_free(&active_state->output);
- buffer_free(&active_state->outgoing_packet);
- buffer_free(&active_state->incoming_packet);
- if (active_state->compression_buffer_ready) {
- buffer_free(&active_state->compression_buffer);
- buffer_compress_uninit();
+ if ((r = cipher_cleanup(&state->send_context)) != 0)
+ error("%s: cipher_cleanup failed: %s", __func__, ssh_err(r));
+ if ((r = cipher_cleanup(&state->receive_context)) != 0)
+ error("%s: cipher_cleanup failed: %s", __func__, ssh_err(r));
+ if (ssh->remote_ipaddr) {
+ free(ssh->remote_ipaddr);
+ ssh->remote_ipaddr = NULL;
}
- cipher_cleanup(&active_state->send_context);
- cipher_cleanup(&active_state->receive_context);
+ free(ssh->state);
+ ssh->state = NULL;
}
/* Sets remote side protocol flags. */
void
-packet_set_protocol_flags(u_int protocol_flags)
+ssh_packet_set_protocol_flags(struct ssh *ssh, u_int protocol_flags)
{
- active_state->remote_protocol_flags = protocol_flags;
+ ssh->state->remote_protocol_flags = protocol_flags;
}
/* Returns the remote protocol flags set earlier by the above function. */
u_int
-packet_get_protocol_flags(void)
+ssh_packet_get_protocol_flags(struct ssh *ssh)
{
- return active_state->remote_protocol_flags;
+ return ssh->state->remote_protocol_flags;
}
/*
@@ -530,135 +533,275 @@ packet_get_protocol_flags(void)
* Level is compression level 1 (fastest) - 9 (slow, best) as in gzip.
*/
-static void
-packet_init_compression(void)
+static int
+ssh_packet_init_compression(struct ssh *ssh)
{
- if (active_state->compression_buffer_ready == 1)
- return;
- active_state->compression_buffer_ready = 1;
- buffer_init(&active_state->compression_buffer);
+ if (!ssh->state->compression_buffer &&
+ ((ssh->state->compression_buffer = sshbuf_new()) == NULL))
+ return SSH_ERR_ALLOC_FAIL;
+ return 0;
}
-void
-packet_start_compression(int level)
-{
- if (active_state->packet_compression && !compat20)
- fatal("Compression already enabled.");
- active_state->packet_compression = 1;
- packet_init_compression();
- buffer_compress_init_send(level);
- buffer_compress_init_recv();
+static int
+start_compression_out(struct ssh *ssh, int level)
+{
+ if (level < 1 || level > 9)
+ return SSH_ERR_INVALID_ARGUMENT;
+ debug("Enabling compression at level %d.", level);
+ if (ssh->state->compression_out_started == 1)
+ deflateEnd(&ssh->state->compression_out_stream);
+ switch (deflateInit(&ssh->state->compression_out_stream, level)) {
+ case Z_OK:
+ ssh->state->compression_out_started = 1;
+ break;
+ case Z_MEM_ERROR:
+ return SSH_ERR_ALLOC_FAIL;
+ default:
+ return SSH_ERR_INTERNAL_ERROR;
+ }
+ return 0;
}
-/*
- * 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.
- */
+static int
+start_compression_in(struct ssh *ssh)
+{
+ if (ssh->state->compression_in_started == 1)
+ inflateEnd(&ssh->state->compression_in_stream);
+ switch (inflateInit(&ssh->state->compression_in_stream)) {
+ case Z_OK:
+ ssh->state->compression_in_started = 1;
+ break;
+ case Z_MEM_ERROR:
+ return SSH_ERR_ALLOC_FAIL;
+ default:
+ return SSH_ERR_INTERNAL_ERROR;
+ }
+ return 0;
+}
-void
-packet_set_encryption_key(const u_char *key, u_int keylen, int number)
+int
+ssh_packet_start_compression(struct ssh *ssh, int level)
{
- const Cipher *cipher = cipher_by_number(number);
int r;
- if (cipher == NULL)
- fatal("packet_set_encryption_key: unknown cipher number %d", number);
- if (keylen < 20)
- fatal("packet_set_encryption_key: keylen too small: %d", keylen);
- if (keylen > SSH_SESSION_KEY_LENGTH)
- fatal("packet_set_encryption_key: keylen too big: %d", keylen);
- memcpy(active_state->ssh1_key, key, keylen);
- active_state->ssh1_keylen = keylen;
- if ((r = cipher_init(&active_state->send_context, cipher,
- key, keylen, NULL, 0, CIPHER_ENCRYPT)) != 0 ||
- (r = cipher_init(&active_state->receive_context, cipher,
- key, keylen, NULL, 0, CIPHER_DECRYPT)) != 0)
- fatal("%s: cipher_init: %s", __func__, ssh_err(r));
+ if (ssh->state->packet_compression && !compat20)
+ return SSH_ERR_INTERNAL_ERROR;
+ ssh->state->packet_compression = 1;
+ if ((r = ssh_packet_init_compression(ssh)) != 0 ||
+ (r = start_compression_in(ssh)) != 0 ||
+ (r = start_compression_out(ssh, level)) != 0)
+ return r;
+ return 0;
}
-u_int
-packet_get_encryption_key(u_char *key)
+/* XXX remove need for separate compression buffer */
+static int
+compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out)
{
- if (key == NULL)
- return (active_state->ssh1_keylen);
- memcpy(key, active_state->ssh1_key, active_state->ssh1_keylen);
- return (active_state->ssh1_keylen);
-}
+ u_char buf[4096];
+ int r, status;
-/* Start constructing a packet to send. */
-void
-packet_start(u_char type)
-{
- u_char buf[9];
- int len;
+ if (ssh->state->compression_out_started != 1)
+ return SSH_ERR_INTERNAL_ERROR;
- DBG(debug("packet_start[%d]", type));
- len = compat20 ? 6 : 9;
- memset(buf, 0, len - 1);
- buf[len - 1] = type;
- buffer_clear(&active_state->outgoing_packet);
- buffer_append(&active_state->outgoing_packet, buf, len);
+ /* This case is not handled below. */
+ if (sshbuf_len(in) == 0)
+ return 0;
+
+ /* Input is the contents of the input buffer. */
+ if ((ssh->state->compression_out_stream.next_in =
+ sshbuf_mutable_ptr(in)) == NULL)
+ return SSH_ERR_INTERNAL_ERROR;
+ ssh->state->compression_out_stream.avail_in = sshbuf_len(in);
+
+ /* Loop compressing until deflate() returns with avail_out != 0. */
+ do {
+ /* Set up fixed-size output buffer. */
+ ssh->state->compression_out_stream.next_out = buf;
+ ssh->state->compression_out_stream.avail_out = sizeof(buf);
+
+ /* Compress as much data into the buffer as possible. */
+ status = deflate(&ssh->state->compression_out_stream,
+ Z_PARTIAL_FLUSH);
+ switch (status) {
+ case Z_MEM_ERROR:
+ return SSH_ERR_ALLOC_FAIL;
+ case Z_OK:
+ /* Append compressed data to output_buffer. */
+ if ((r = sshbuf_put(out, buf, sizeof(buf) -
+ ssh->state->compression_out_stream.avail_out)) != 0)
+ return r;
+ break;
+ case Z_STREAM_ERROR:
+ default:
+ ssh->state->compression_out_failures++;
+ return SSH_ERR_INVALID_FORMAT;
+ }
+ } while (ssh->state->compression_out_stream.avail_out == 0);
+ return 0;
}
-/* Append payload. */
-void
-packet_put_char(int value)
+static int
+uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out)
{
- char ch = value;
+ u_char buf[4096];
+ int r, status;
- buffer_append(&active_state->outgoing_packet, &ch, 1);
-}
+ if (ssh->state->compression_in_started != 1)
+ return SSH_ERR_INTERNAL_ERROR;
-void
-packet_put_int(u_int value)
-{
- buffer_put_int(&active_state->outgoing_packet, value);
-}
+ if ((ssh->state->compression_in_stream.next_in =
+ sshbuf_mutable_ptr(in)) == NULL)
+ return SSH_ERR_INTERNAL_ERROR;
+ ssh->state->compression_in_stream.avail_in = sshbuf_len(in);
-void
-packet_put_int64(u_int64_t value)
-{
- buffer_put_int64(&active_state->outgoing_packet, value);
+ for (;;) {
+ /* Set up fixed-size output buffer. */
+ ssh->state->compression_in_stream.next_out = buf;
+ ssh->state->compression_in_stream.avail_out = sizeof(buf);
+
+ status = inflate(&ssh->state->compression_in_stream,
+ Z_PARTIAL_FLUSH);
+ switch (status) {
+ case Z_OK:
+ if ((r = sshbuf_put(out, buf, sizeof(buf) -
+ ssh->state->compression_in_stream.avail_out)) != 0)
+ return r;
+ break;
+ case Z_BUF_ERROR:
+ /*
+ * Comments in zlib.h say that we should keep calling
+ * inflate() until we get an error. This appears to
+ * be the error that we get.
+ */
+ return 0;
+ case Z_DATA_ERROR:
+ return SSH_ERR_INVALID_FORMAT;
+ case Z_MEM_ERROR:
+ return SSH_ERR_ALLOC_FAIL;
+ case Z_STREAM_ERROR:
+ default:
+ ssh->state->compression_in_failures++;
+ return SSH_ERR_INTERNAL_ERROR;
+ }
+ }
+ /* NOTREACHED */
}
-void
-packet_put_string(const void *buf, u_int len)
+/* Serialise compression state into a blob for privsep */
+static int
+ssh_packet_get_compress_state(struct sshbuf *m, struct ssh *ssh)
{
- buffer_put_string(&active_state->outgoing_packet, buf, len);
-}
+ struct session_state *state = ssh->state;
+ struct sshbuf *b;
+ int r;
-void
-packet_put_cstring(const char *str)
+ 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)
{
- buffer_put_cstring(&active_state->outgoing_packet, str);
+ 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
-packet_put_raw(const void *buf, u_int len)
+ssh_packet_set_compress_hooks(struct ssh *ssh, void *ctx,
+ void *(*allocfunc)(void *, u_int, u_int),
+ void (*freefunc)(void *, void *))
{
- buffer_append(&active_state->outgoing_packet, buf, len);
+ 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;
}
-#ifdef WITH_OPENSSL
-void
-packet_put_bignum(BIGNUM * value)
-{
- buffer_put_bignum(&active_state->outgoing_packet, value);
-}
+/*
+ * 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.
+ */
+#ifdef WITH_OPENSSL
void
-packet_put_bignum2(BIGNUM * value)
+ssh_packet_set_encryption_key(struct ssh *ssh, const u_char *key, u_int keylen, int number)
{
- buffer_put_bignum2(&active_state->outgoing_packet, value);
-}
-#endif
+ struct session_state *state = ssh->state;
+ const struct sshcipher *cipher = cipher_by_number(number);
+ int r;
+ const char *wmsg;
-#ifdef OPENSSL_HAS_ECC
-void
-packet_put_ecpoint(const EC_GROUP *curve, const EC_POINT *point)
-{
- buffer_put_ecpoint(&active_state->outgoing_packet, curve, point);
+ if (cipher == NULL)
+ fatal("%s: unknown cipher number %d", __func__, number);
+ if (keylen < 20)
+ fatal("%s: keylen too small: %d", __func__, keylen);
+ if (keylen > SSH_SESSION_KEY_LENGTH)
+ fatal("%s: keylen too big: %d", __func__, keylen);
+ memcpy(state->ssh1_key, key, keylen);
+ state->ssh1_keylen = keylen;
+ if ((r = cipher_init(&state->send_context, cipher, key, keylen,
+ NULL, 0, CIPHER_ENCRYPT)) != 0 ||
+ (r = cipher_init(&state->receive_context, cipher, key, keylen,
+ NULL, 0, CIPHER_DECRYPT) != 0))
+ fatal("%s: cipher_init failed: %s", __func__, ssh_err(r));
+ if (!state->cipher_warning_done &&
+ ((wmsg = cipher_warning_message(&state->send_context)) != NULL ||
+ (wmsg = cipher_warning_message(&state->send_context)) != NULL)) {
+ error("Warning: %s", wmsg);
+ state->cipher_warning_done = 1;
+ }
}
#endif
@@ -667,114 +810,126 @@ packet_put_ecpoint(const EC_GROUP *curve, const EC_POINT *point)
* encrypts the packet before sending.
*/
-static void
-packet_send1(void)
+int
+ssh_packet_send1(struct ssh *ssh)
{
+ struct session_state *state = ssh->state;
u_char buf[8], *cp;
- int i, padding, len;
+ int r, padding, len;
u_int checksum;
- u_int32_t rnd = 0;
/*
* If using packet compression, compress the payload of the outgoing
* packet.
*/
- if (active_state->packet_compression) {
- buffer_clear(&active_state->compression_buffer);
+ if (state->packet_compression) {
+ sshbuf_reset(state->compression_buffer);
/* Skip padding. */
- buffer_consume(&active_state->outgoing_packet, 8);
+ if ((r = sshbuf_consume(state->outgoing_packet, 8)) != 0)
+ goto out;
/* padding */
- buffer_append(&active_state->compression_buffer,
- "\0\0\0\0\0\0\0\0", 8);
- buffer_compress(&active_state->outgoing_packet,
- &active_state->compression_buffer);
- buffer_clear(&active_state->outgoing_packet);
- buffer_append(&active_state->outgoing_packet,
- buffer_ptr(&active_state->compression_buffer),
- buffer_len(&active_state->compression_buffer));
+ if ((r = sshbuf_put(state->compression_buffer,
+ "\0\0\0\0\0\0\0\0", 8)) != 0)
+ goto out;
+ if ((r = compress_buffer(ssh, state->outgoing_packet,
+ state->compression_buffer)) != 0)
+ goto out;
+ sshbuf_reset(state->outgoing_packet);
+ if ((r = sshbuf_putb(state->outgoing_packet,
+ state->compression_buffer)) != 0)
+ goto out;
}
/* Compute packet length without padding (add checksum, remove padding). */
- len = buffer_len(&active_state->outgoing_packet) + 4 - 8;
+ len = sshbuf_len(state->outgoing_packet) + 4 - 8;
/* Insert padding. Initialized to zero in packet_start1() */
padding = 8 - len % 8;
- if (!active_state->send_context.plaintext) {
- cp = buffer_ptr(&active_state->outgoing_packet);
- for (i = 0; i < padding; i++) {
- if (i % 4 == 0)
- rnd = arc4random();
- cp[7 - i] = rnd & 0xff;
- rnd >>= 8;
+ if (!state->send_context.plaintext) {
+ cp = sshbuf_mutable_ptr(state->outgoing_packet);
+ if (cp == NULL) {
+ r = SSH_ERR_INTERNAL_ERROR;
+ goto out;
}
+ arc4random_buf(cp + 8 - padding, padding);
}
- buffer_consume(&active_state->outgoing_packet, 8 - padding);
+ if ((r = sshbuf_consume(state->outgoing_packet, 8 - padding)) != 0)
+ goto out;
/* Add check bytes. */
- checksum = ssh_crc32(buffer_ptr(&active_state->outgoing_packet),
- buffer_len(&active_state->outgoing_packet));
- put_u32(buf, checksum);
- buffer_append(&active_state->outgoing_packet, buf, 4);
+ checksum = ssh_crc32(sshbuf_ptr(state->outgoing_packet),
+ sshbuf_len(state->outgoing_packet));
+ POKE_U32(buf, checksum);
+ if ((r = sshbuf_put(state->outgoing_packet, buf, 4)) != 0)
+ goto out;
#ifdef PACKET_DEBUG
fprintf(stderr, "packet_send plain: ");
- buffer_dump(&active_state->outgoing_packet);
+ sshbuf_dump(state->outgoing_packet, stderr);
#endif
/* Append to output. */
- put_u32(buf, len);
- buffer_append(&active_state->output, buf, 4);
- cp = buffer_append_space(&active_state->output,
- buffer_len(&active_state->outgoing_packet));
- if (cipher_crypt(&active_state->send_context, 0, cp,
- buffer_ptr(&active_state->outgoing_packet),
- buffer_len(&active_state->outgoing_packet), 0, 0) != 0)
- fatal("%s: cipher_crypt failed", __func__);
+ POKE_U32(buf, len);
+ if ((r = sshbuf_put(state->output, buf, 4)) != 0)
+ goto out;
+ if ((r = sshbuf_reserve(state->output,
+ sshbuf_len(state->outgoing_packet), &cp)) != 0)
+ goto out;
+ if ((r = cipher_crypt(&state->send_context, 0, cp,
+ sshbuf_ptr(state->outgoing_packet),
+ sshbuf_len(state->outgoing_packet), 0, 0)) != 0)
+ goto out;
#ifdef PACKET_DEBUG
fprintf(stderr, "encrypted: ");
- buffer_dump(&active_state->output);
+ sshbuf_dump(state->output, stderr);
#endif
- active_state->p_send.packets++;
- active_state->p_send.bytes += len +
- buffer_len(&active_state->outgoing_packet);
- buffer_clear(&active_state->outgoing_packet);
+ state->p_send.packets++;
+ state->p_send.bytes += len +
+ sshbuf_len(state->outgoing_packet);
+ sshbuf_reset(state->outgoing_packet);
/*
* Note that the packet is now only buffered in output. It won't be
* actually sent until packet_write_wait or packet_write_poll is
* called.
*/
+ r = 0;
+ out:
+ return r;
}
-void
-set_newkeys(int mode)
+int
+ssh_set_newkeys(struct ssh *ssh, int mode)
{
- Enc *enc;
- Mac *mac;
- Comp *comp;
- CipherContext *cc;
+ struct session_state *state = ssh->state;
+ struct sshenc *enc;
+ struct sshmac *mac;
+ struct sshcomp *comp;
+ struct sshcipher_ctx *cc;
u_int64_t *max_blocks;
+ const char *wmsg;
int r, crypt_type;
debug2("set_newkeys: mode %d", mode);
if (mode == MODE_OUT) {
- cc = &active_state->send_context;
+ cc = &state->send_context;
crypt_type = CIPHER_ENCRYPT;
- active_state->p_send.packets = active_state->p_send.blocks = 0;
- max_blocks = &active_state->max_blocks_out;
+ state->p_send.packets = state->p_send.blocks = 0;
+ max_blocks = &state->max_blocks_out;
} else {
- cc = &active_state->receive_context;
+ cc = &state->receive_context;
crypt_type = CIPHER_DECRYPT;
- active_state->p_read.packets = active_state->p_read.blocks = 0;
- max_blocks = &active_state->max_blocks_in;
+ state->p_read.packets = state->p_read.blocks = 0;
+ max_blocks = &state->max_blocks_in;
}
- if (active_state->newkeys[mode] != NULL) {
+ if (state->newkeys[mode] != NULL) {
debug("set_newkeys: rekeying");
- cipher_cleanup(cc);
- enc = &active_state->newkeys[mode]->enc;
- mac = &active_state->newkeys[mode]->mac;
- comp = &active_state->newkeys[mode]->comp;
+ if ((r = cipher_cleanup(cc)) != 0)
+ return r;
+ enc = &state->newkeys[mode]->enc;
+ mac = &state->newkeys[mode]->mac;
+ comp = &state->newkeys[mode]->comp;
mac_clear(mac);
explicit_bzero(enc->iv, enc->iv_len);
explicit_bzero(enc->key, enc->key_len);
@@ -785,32 +940,45 @@ set_newkeys(int mode)
free(mac->name);
free(mac->key);
free(comp->name);
- free(active_state->newkeys[mode]);
- }
- active_state->newkeys[mode] = kex_get_newkeys(mode);
- if (active_state->newkeys[mode] == NULL)
- fatal("newkeys: no keys for mode %d", mode);
- enc = &active_state->newkeys[mode]->enc;
- mac = &active_state->newkeys[mode]->mac;
- comp = &active_state->newkeys[mode]->comp;
- if (cipher_authlen(enc->cipher) == 0 && mac_init(mac) == 0)
- mac->enabled = 1;
+ free(state->newkeys[mode]);
+ }
+ /* move newkeys from kex to state */
+ if ((state->newkeys[mode] = ssh->kex->newkeys[mode]) == NULL)
+ return SSH_ERR_INTERNAL_ERROR;
+ ssh->kex->newkeys[mode] = NULL;
+ enc = &state->newkeys[mode]->enc;
+ mac = &state->newkeys[mode]->mac;
+ comp = &state->newkeys[mode]->comp;
+ if (cipher_authlen(enc->cipher) == 0) {
+ if ((r = mac_init(mac)) != 0)
+ return r;
+ }
+ mac->enabled = 1;
DBG(debug("cipher_init_context: %d", mode));
if ((r = cipher_init(cc, enc->cipher, enc->key, enc->key_len,
enc->iv, enc->iv_len, crypt_type)) != 0)
- fatal("%s: cipher_init: %s", __func__, ssh_err(r));
+ return r;
+ if (!state->cipher_warning_done &&
+ (wmsg = cipher_warning_message(cc)) != NULL) {
+ error("Warning: %s", wmsg);
+ state->cipher_warning_done = 1;
+ }
/* Deleting the keys does not gain extra security */
/* explicit_bzero(enc->iv, enc->block_size);
explicit_bzero(enc->key, enc->key_len);
explicit_bzero(mac->key, mac->key_len); */
if ((comp->type == COMP_ZLIB ||
(comp->type == COMP_DELAYED &&
- active_state->after_authentication)) && comp->enabled == 0) {
- packet_init_compression();
- if (mode == MODE_OUT)
- buffer_compress_init_send(6);
- else
- buffer_compress_init_recv();
+ state->after_authentication)) && comp->enabled == 0) {
+ if ((r = ssh_packet_init_compression(ssh)) < 0)
+ return r;
+ if (mode == MODE_OUT) {
+ if ((r = start_compression_out(ssh, 6)) != 0)
+ return r;
+ } else {
+ if ((r = start_compression_in(ssh)) != 0)
+ return r;
+ }
comp->enabled = 1;
}
/*
@@ -821,9 +989,10 @@ set_newkeys(int mode)
*max_blocks = (u_int64_t)1 << (enc->block_size*2);
else
*max_blocks = ((u_int64_t)1 << 30) / enc->block_size;
- if (active_state->rekey_limit)
+ if (state->rekey_limit)
*max_blocks = MIN(*max_blocks,
- active_state->rekey_limit / enc->block_size);
+ state->rekey_limit / enc->block_size);
+ return 0;
}
/*
@@ -831,53 +1000,59 @@ set_newkeys(int mode)
* This happens on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent,
* and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received.
*/
-static void
-packet_enable_delayed_compress(void)
+static int
+ssh_packet_enable_delayed_compress(struct ssh *ssh)
{
- Comp *comp = NULL;
- int mode;
+ struct session_state *state = ssh->state;
+ struct sshcomp *comp = NULL;
+ int r, mode;
/*
* Remember that we are past the authentication step, so rekeying
* with COMP_DELAYED will turn on compression immediately.
*/
- active_state->after_authentication = 1;
+ state->after_authentication = 1;
for (mode = 0; mode < MODE_MAX; mode++) {
/* protocol error: USERAUTH_SUCCESS received before NEWKEYS */
- if (active_state->newkeys[mode] == NULL)
+ if (state->newkeys[mode] == NULL)
continue;
- comp = &active_state->newkeys[mode]->comp;
+ comp = &state->newkeys[mode]->comp;
if (comp && !comp->enabled && comp->type == COMP_DELAYED) {
- packet_init_compression();
- if (mode == MODE_OUT)
- buffer_compress_init_send(6);
- else
- buffer_compress_init_recv();
+ if ((r = ssh_packet_init_compression(ssh)) != 0)
+ return r;
+ if (mode == MODE_OUT) {
+ if ((r = start_compression_out(ssh, 6)) != 0)
+ return r;
+ } else {
+ if ((r = start_compression_in(ssh)) != 0)
+ return r;
+ }
comp->enabled = 1;
}
}
+ return 0;
}
/*
* Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
*/
-static void
-packet_send2_wrapped(void)
+int
+ssh_packet_send2_wrapped(struct ssh *ssh)
{
+ struct session_state *state = ssh->state;
u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH];
u_char padlen, pad = 0;
- u_int i, len, authlen = 0, aadlen = 0;
- u_int32_t rnd = 0;
- Enc *enc = NULL;
- Mac *mac = NULL;
- Comp *comp = NULL;
- int block_size;
- int r;
-
- if (active_state->newkeys[MODE_OUT] != NULL) {
- enc = &active_state->newkeys[MODE_OUT]->enc;
- mac = &active_state->newkeys[MODE_OUT]->mac;
- comp = &active_state->newkeys[MODE_OUT]->comp;
+ u_int authlen = 0, aadlen = 0;
+ u_int len;
+ struct sshenc *enc = NULL;
+ struct sshmac *mac = NULL;
+ struct sshcomp *comp = NULL;
+ int r, block_size;
+
+ if (state->newkeys[MODE_OUT] != NULL) {
+ enc = &state->newkeys[MODE_OUT]->enc;
+ mac = &state->newkeys[MODE_OUT]->mac;
+ comp = &state->newkeys[MODE_OUT]->comp;
/* disable mac for authenticated encryption */
if ((authlen = cipher_authlen(enc->cipher)) != 0)
mac = NULL;
@@ -885,32 +1060,34 @@ packet_send2_wrapped(void)
block_size = enc ? enc->block_size : 8;
aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0;
- cp = buffer_ptr(&active_state->outgoing_packet);
- type = cp[5];
+ type = (sshbuf_ptr(state->outgoing_packet))[5];
#ifdef PACKET_DEBUG
fprintf(stderr, "plain: ");
- buffer_dump(&active_state->outgoing_packet);
+ sshbuf_dump(state->outgoing_packet, stderr);
#endif
if (comp && comp->enabled) {
- len = buffer_len(&active_state->outgoing_packet);
+ len = sshbuf_len(state->outgoing_packet);
/* skip header, compress only payload */
- buffer_consume(&active_state->outgoing_packet, 5);
- buffer_clear(&active_state->compression_buffer);
- buffer_compress(&active_state->outgoing_packet,
- &active_state->compression_buffer);
- buffer_clear(&active_state->outgoing_packet);
- buffer_append(&active_state->outgoing_packet, "\0\0\0\0\0", 5);
- buffer_append(&active_state->outgoing_packet,
- buffer_ptr(&active_state->compression_buffer),
- buffer_len(&active_state->compression_buffer));
- DBG(debug("compression: raw %d compressed %d", len,
- buffer_len(&active_state->outgoing_packet)));
+ if ((r = sshbuf_consume(state->outgoing_packet, 5)) != 0)
+ goto out;
+ sshbuf_reset(state->compression_buffer);
+ if ((r = compress_buffer(ssh, state->outgoing_packet,
+ state->compression_buffer)) != 0)
+ goto out;
+ sshbuf_reset(state->outgoing_packet);
+ if ((r = sshbuf_put(state->outgoing_packet,
+ "\0\0\0\0\0", 5)) != 0 ||
+ (r = sshbuf_putb(state->outgoing_packet,
+ state->compression_buffer)) != 0)
+ goto out;
+ DBG(debug("compression: raw %d compressed %zd", len,
+ sshbuf_len(state->outgoing_packet)));
}
/* sizeof (packet_len + pad_len + payload) */
- len = buffer_len(&active_state->outgoing_packet);
+ len = sshbuf_len(state->outgoing_packet);
/*
* calc size of padding, alloc space, get random data,
@@ -920,143 +1097,145 @@ packet_send2_wrapped(void)
padlen = block_size - (len % block_size);
if (padlen < 4)
padlen += block_size;
- if (active_state->extra_pad) {
+ if (state->extra_pad) {
/* will wrap if extra_pad+padlen > 255 */
- active_state->extra_pad =
- roundup(active_state->extra_pad, block_size);
- pad = active_state->extra_pad -
- ((len + padlen) % active_state->extra_pad);
+ state->extra_pad =
+ roundup(state->extra_pad, block_size);
+ pad = state->extra_pad -
+ ((len + padlen) % state->extra_pad);
DBG(debug3("%s: adding %d (len %d padlen %d extra_pad %d)",
- __func__, pad, len, padlen, active_state->extra_pad));
+ __func__, pad, len, padlen, state->extra_pad));
padlen += pad;
- active_state->extra_pad = 0;
+ state->extra_pad = 0;
}
- cp = buffer_append_space(&active_state->outgoing_packet, padlen);
- if (enc && !active_state->send_context.plaintext) {
+ if ((r = sshbuf_reserve(state->outgoing_packet, padlen, &cp)) != 0)
+ goto out;
+ if (enc && !state->send_context.plaintext) {
/* random padding */
- for (i = 0; i < padlen; i++) {
- if (i % 4 == 0)
- rnd = arc4random();
- cp[i] = rnd & 0xff;
- rnd >>= 8;
- }
+ arc4random_buf(cp, padlen);
} else {
/* clear padding */
explicit_bzero(cp, padlen);
}
/* sizeof (packet_len + pad_len + payload + padding) */
- len = buffer_len(&active_state->outgoing_packet);
- cp = buffer_ptr(&active_state->outgoing_packet);
+ len = sshbuf_len(state->outgoing_packet);
+ cp = sshbuf_mutable_ptr(state->outgoing_packet);
+ if (cp == NULL) {
+ r = SSH_ERR_INTERNAL_ERROR;
+ goto out;
+ }
/* packet_length includes payload, padding and padding length field */
- put_u32(cp, len - 4);
+ POKE_U32(cp, len - 4);
cp[4] = padlen;
DBG(debug("send: len %d (includes padlen %d, aadlen %d)",
len, padlen, aadlen));
/* compute MAC over seqnr and packet(length fields, payload, padding) */
if (mac && mac->enabled && !mac->etm) {
- if ((r = mac_compute(mac, active_state->p_send.seqnr,
- buffer_ptr(&active_state->outgoing_packet), len,
+ if ((r = mac_compute(mac, state->p_send.seqnr,
+ sshbuf_ptr(state->outgoing_packet), len,
macbuf, sizeof(macbuf))) != 0)
- fatal("%s: mac_compute: %s", __func__, ssh_err(r));
- DBG(debug("done calc MAC out #%d", active_state->p_send.seqnr));
+ goto out;
+ DBG(debug("done calc MAC out #%d", state->p_send.seqnr));
}
/* encrypt packet and append to output buffer. */
- cp = buffer_append_space(&active_state->output, len + authlen);
- if (cipher_crypt(&active_state->send_context, active_state->p_send.seqnr,
- cp, buffer_ptr(&active_state->outgoing_packet),
- len - aadlen, aadlen, authlen) != 0)
- fatal("%s: cipher_crypt failed", __func__);
+ if ((r = sshbuf_reserve(state->output,
+ sshbuf_len(state->outgoing_packet) + authlen, &cp)) != 0)
+ goto out;
+ if ((r = cipher_crypt(&state->send_context, state->p_send.seqnr, cp,
+ sshbuf_ptr(state->outgoing_packet),
+ len - aadlen, aadlen, authlen)) != 0)
+ goto out;
/* append unencrypted MAC */
if (mac && mac->enabled) {
if (mac->etm) {
/* EtM: compute mac over aadlen + cipher text */
- if ((r = mac_compute(mac,
- active_state->p_send.seqnr, cp, len,
- macbuf, sizeof(macbuf))) != 0)
- fatal("%s: mac_compute: %s", __func__, ssh_err(r));
+ if ((r = mac_compute(mac, state->p_send.seqnr,
+ cp, len, macbuf, sizeof(macbuf))) != 0)
+ goto out;
DBG(debug("done calc MAC(EtM) out #%d",
- active_state->p_send.seqnr));
+ state->p_send.seqnr));
}
- buffer_append(&active_state->output, macbuf, mac->mac_len);
+ if ((r = sshbuf_put(state->output, macbuf, mac->mac_len)) != 0)
+ goto out;
}
#ifdef PACKET_DEBUG
fprintf(stderr, "encrypted: ");
- buffer_dump(&active_state->output);
+ sshbuf_dump(state->output, stderr);
#endif
/* increment sequence number for outgoing packets */
- if (++active_state->p_send.seqnr == 0)
+ if (++state->p_send.seqnr == 0)
logit("outgoing seqnr wraps around");
- if (++active_state->p_send.packets == 0)
- if (!(datafellows & SSH_BUG_NOREKEY))
- fatal("XXX too many packets with same key");
- active_state->p_send.blocks += len / block_size;
- active_state->p_send.bytes += len;
- buffer_clear(&active_state->outgoing_packet);
+ if (++state->p_send.packets == 0)
+ if (!(ssh->compat & SSH_BUG_NOREKEY))
+ return SSH_ERR_NEED_REKEY;
+ state->p_send.blocks += len / block_size;
+ state->p_send.bytes += len;
+ sshbuf_reset(state->outgoing_packet);
if (type == SSH2_MSG_NEWKEYS)
- set_newkeys(MODE_OUT);
- else if (type == SSH2_MSG_USERAUTH_SUCCESS && active_state->server_side)
- packet_enable_delayed_compress();
+ r = ssh_set_newkeys(ssh, MODE_OUT);
+ else if (type == SSH2_MSG_USERAUTH_SUCCESS && state->server_side)
+ r = ssh_packet_enable_delayed_compress(ssh);
+ else
+ r = 0;
+ out:
+ return r;
}
-static void
-packet_send2(void)
+int
+ssh_packet_send2(struct ssh *ssh)
{
+ struct session_state *state = ssh->state;
struct packet *p;
- u_char type, *cp;
+ u_char type;
+ int r;
- cp = buffer_ptr(&active_state->outgoing_packet);
- type = cp[5];
+ type = sshbuf_ptr(state->outgoing_packet)[5];
/* during rekeying we can only send key exchange messages */
- if (active_state->rekeying) {
+ if (state->rekeying) {
if ((type < SSH2_MSG_TRANSPORT_MIN) ||
(type > SSH2_MSG_TRANSPORT_MAX) ||
(type == SSH2_MSG_SERVICE_REQUEST) ||
(type == SSH2_MSG_SERVICE_ACCEPT)) {
debug("enqueue packet: %u", type);
- p = xcalloc(1, sizeof(*p));
+ p = calloc(1, sizeof(*p));
+ if (p == NULL)
+ return SSH_ERR_ALLOC_FAIL;
p->type = type;
- memcpy(&p->payload, &active_state->outgoing_packet,
- sizeof(Buffer));
- buffer_init(&active_state->outgoing_packet);
- TAILQ_INSERT_TAIL(&active_state->outgoing, p, next);
- return;
+ p->payload = state->outgoing_packet;
+ TAILQ_INSERT_TAIL(&state->outgoing, p, next);
+ state->outgoing_packet = sshbuf_new();
+ if (state->outgoing_packet == NULL)
+ return SSH_ERR_ALLOC_FAIL;
+ return 0;
}
}
/* rekeying starts with sending KEXINIT */
if (type == SSH2_MSG_KEXINIT)
- active_state->rekeying = 1;
+ state->rekeying = 1;
- packet_send2_wrapped();
+ if ((r = ssh_packet_send2_wrapped(ssh)) != 0)
+ return r;
/* after a NEWKEYS message we can send the complete queue */
if (type == SSH2_MSG_NEWKEYS) {
- active_state->rekeying = 0;
- active_state->rekey_time = monotime();
- while ((p = TAILQ_FIRST(&active_state->outgoing))) {
+ state->rekeying = 0;
+ state->rekey_time = monotime();
+ while ((p = TAILQ_FIRST(&state->outgoing))) {
type = p->type;
debug("dequeue packet: %u", type);
- buffer_free(&active_state->outgoing_packet);
- memcpy(&active_state->outgoing_packet, &p->payload,
- sizeof(Buffer));
- TAILQ_REMOVE(&active_state->outgoing, p, next);
+ sshbuf_free(state->outgoing_packet);
+ state->outgoing_packet = p->payload;
+ TAILQ_REMOVE(&state->outgoing, p, next);
free(p);
- packet_send2_wrapped();
+ if ((r = ssh_packet_send2_wrapped(ssh)) != 0)
+ return r;
}
}
-}
-
-void
-packet_send(void)
-{
- if (compat20)
- packet_send2();
- else
- packet_send1();
- DBG(debug("packet_send done"));
+ return 0;
}
/*
@@ -1066,95 +1245,106 @@ packet_send(void)
*/
int
-packet_read_seqnr(u_int32_t *seqnr_p)
+ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
{
- int type, len, ret, cont, ms_remain = 0;
+ struct session_state *state = ssh->state;
+ int len, r, ms_remain, cont;
fd_set *setp;
char buf[8192];
struct timeval timeout, start, *timeoutp = NULL;
DBG(debug("packet_read()"));
- setp = (fd_set *)xcalloc(howmany(active_state->connection_in + 1,
+ setp = (fd_set *)calloc(howmany(state->connection_in + 1,
NFDBITS), sizeof(fd_mask));
+ if (setp == NULL)
+ return SSH_ERR_ALLOC_FAIL;
/* Since we are blocking, ensure that all written packets have been sent. */
- packet_write_wait();
+ ssh_packet_write_wait(ssh);
/* Stay in the loop until we have received a complete packet. */
for (;;) {
/* Try to read a packet from the buffer. */
- type = packet_read_poll_seqnr(seqnr_p);
+ r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p);
+ if (r != 0)
+ break;
if (!compat20 && (
- type == SSH_SMSG_SUCCESS
- || type == SSH_SMSG_FAILURE
- || type == SSH_CMSG_EOF
- || type == SSH_CMSG_EXIT_CONFIRMATION))
- packet_check_eom();
+ *typep == SSH_SMSG_SUCCESS
+ || *typep == SSH_SMSG_FAILURE
+ || *typep == SSH_CMSG_EOF
+ || *typep == SSH_CMSG_EXIT_CONFIRMATION))
+ if ((r = sshpkt_get_end(ssh)) != 0)
+ break;
/* If we got a packet, return it. */
- if (type != SSH_MSG_NONE) {
- free(setp);
- return type;
- }
+ if (*typep != SSH_MSG_NONE)
+ break;
/*
* Otherwise, wait for some data to arrive, add it to the
* buffer, and try again.
*/
- memset(setp, 0, howmany(active_state->connection_in + 1,
+ memset(setp, 0, howmany(state->connection_in + 1,
NFDBITS) * sizeof(fd_mask));
- FD_SET(active_state->connection_in, setp);
+ FD_SET(state->connection_in, setp);
- if (active_state->packet_timeout_ms > 0) {
- ms_remain = active_state->packet_timeout_ms;
+ if (state->packet_timeout_ms > 0) {
+ ms_remain = state->packet_timeout_ms;
timeoutp = &timeout;
}
/* Wait for some data to arrive. */
for (;;) {
- if (active_state->packet_timeout_ms != -1) {
+ if (state->packet_timeout_ms != -1) {
ms_to_timeval(&timeout, ms_remain);
gettimeofday(&start, NULL);
}
- if ((ret = select(active_state->connection_in + 1, setp,
+ if ((r = select(state->connection_in + 1, setp,
NULL, NULL, timeoutp)) >= 0)
break;
if (errno != EAGAIN && errno != EINTR &&
errno != EWOULDBLOCK)
break;
- if (active_state->packet_timeout_ms == -1)
+ if (state->packet_timeout_ms == -1)
continue;
ms_subtract_diff(&start, &ms_remain);
if (ms_remain <= 0) {
- ret = 0;
+ r = 0;
break;
}
}
- if (ret == 0) {
+ if (r == 0) {
logit("Connection to %.200s timed out while "
- "waiting to read", get_remote_ipaddr());
+ "waiting to read", ssh_remote_ipaddr(ssh));
cleanup_exit(255);
}
/* Read data from the socket. */
do {
cont = 0;
- len = roaming_read(active_state->connection_in, buf,
+ len = roaming_read(state->connection_in, buf,
sizeof(buf), &cont);
} while (len == 0 && cont);
if (len == 0) {
- logit("Connection closed by %.200s", get_remote_ipaddr());
+ logit("Connection closed by %.200s",
+ ssh_remote_ipaddr(ssh));
cleanup_exit(255);
}
if (len < 0)
fatal("Read from socket failed: %.100s", strerror(errno));
/* Append it to the buffer. */
- packet_process_incoming(buf, len);
+ ssh_packet_process_incoming(ssh, buf, len);
}
- /* NOTREACHED */
+ free(setp);
+ return r;
}
int
-packet_read(void)
+ssh_packet_read(struct ssh *ssh)
{
- return packet_read_seqnr(NULL);
+ u_char type;
+ int r;
+
+ if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
+ return type;
}
/*
@@ -1163,13 +1353,14 @@ packet_read(void)
*/
void
-packet_read_expect(int expected_type)
+ssh_packet_read_expect(struct ssh *ssh, int expected_type)
{
int type;
- type = packet_read();
+ type = ssh_packet_read(ssh);
if (type != expected_type)
- packet_disconnect("Protocol error: expected packet type %d, got %d",
+ ssh_packet_disconnect(ssh,
+ "Protocol error: expected packet type %d, got %d",
expected_type, type);
}
@@ -1182,116 +1373,141 @@ packet_read_expect(int expected_type)
* to higher levels.
*/
-static int
-packet_read_poll1(void)
+int
+ssh_packet_read_poll1(struct ssh *ssh, u_char *typep)
{
+ struct session_state *state = ssh->state;
u_int len, padded_len;
- u_char *cp, type;
+ const u_char *cp;
+ u_char *p;
u_int checksum, stored_checksum;
+ int r;
+
+ *typep = SSH_MSG_NONE;
/* Check if input size is less than minimum packet size. */
- if (buffer_len(&active_state->input) < 4 + 8)
- return SSH_MSG_NONE;
+ if (sshbuf_len(state->input) < 4 + 8)
+ return 0;
/* Get length of incoming packet. */
- cp = buffer_ptr(&active_state->input);
- len = get_u32(cp);
+ len = PEEK_U32(sshbuf_ptr(state->input));
if (len < 1 + 2 + 2 || len > 256 * 1024)
- packet_disconnect("Bad packet length %u.", len);
+ ssh_packet_disconnect(ssh, "Bad packet length %u.",
+ len);
padded_len = (len + 8) & ~7;
/* Check if the packet has been entirely received. */
- if (buffer_len(&active_state->input) < 4 + padded_len)
- return SSH_MSG_NONE;
+ if (sshbuf_len(state->input) < 4 + padded_len)
+ return 0;
/* The entire packet is in buffer. */
/* Consume packet length. */
- buffer_consume(&active_state->input, 4);
+ if ((r = sshbuf_consume(state->input, 4)) != 0)
+ goto out;
/*
* Cryptographic attack detector for ssh
* (C)1998 CORE-SDI, Buenos Aires Argentina
* Ariel Futoransky(futo@core-sdi.com)
*/
- if (!active_state->receive_context.plaintext) {
- switch (detect_attack(buffer_ptr(&active_state->input),
- padded_len)) {
+ if (!state->receive_context.plaintext) {
+ switch (detect_attack(&state->deattack,
+ sshbuf_ptr(state->input), padded_len)) {
+ case DEATTACK_OK:
+ break;
case DEATTACK_DETECTED:
- packet_disconnect("crc32 compensation attack: "
- "network attack detected");
+ ssh_packet_disconnect(ssh,
+ "crc32 compensation attack: network attack detected"
+ );
case DEATTACK_DOS_DETECTED:
- packet_disconnect("deattack denial of "
- "service detected");
+ ssh_packet_disconnect(ssh,
+ "deattack denial of service detected");
+ default:
+ ssh_packet_disconnect(ssh, "deattack error");
}
}
/* Decrypt data to incoming_packet. */
- buffer_clear(&active_state->incoming_packet);
- cp = buffer_append_space(&active_state->incoming_packet, padded_len);
- if (cipher_crypt(&active_state->receive_context, 0, cp,
- buffer_ptr(&active_state->input), padded_len, 0, 0) != 0)
- fatal("%s: cipher_crypt failed", __func__);
+ sshbuf_reset(state->incoming_packet);
+ if ((r = sshbuf_reserve(state->incoming_packet, padded_len, &p)) != 0)
+ goto out;
+ if ((r = cipher_crypt(&state->receive_context, 0, p,
+ sshbuf_ptr(state->input), padded_len, 0, 0)) != 0)
+ goto out;
- buffer_consume(&active_state->input, padded_len);
+ if ((r = sshbuf_consume(state->input, padded_len)) != 0)
+ goto out;
#ifdef PACKET_DEBUG
fprintf(stderr, "read_poll plain: ");
- buffer_dump(&active_state->incoming_packet);
+ sshbuf_dump(state->incoming_packet, stderr);
#endif
/* Compute packet checksum. */
- checksum = ssh_crc32(buffer_ptr(&active_state->incoming_packet),
- buffer_len(&active_state->incoming_packet) - 4);
+ checksum = ssh_crc32(sshbuf_ptr(state->incoming_packet),
+ sshbuf_len(state->incoming_packet) - 4);
/* Skip padding. */
- buffer_consume(&active_state->incoming_packet, 8 - len % 8);
+ if ((r = sshbuf_consume(state->incoming_packet, 8 - len % 8)) != 0)
+ goto out;
/* Test check bytes. */
- if (len != buffer_len(&active_state->incoming_packet))
- packet_disconnect("packet_read_poll1: len %d != buffer_len %d.",
- len, buffer_len(&active_state->incoming_packet));
+ if (len != sshbuf_len(state->incoming_packet))
+ ssh_packet_disconnect(ssh,
+ "packet_read_poll1: len %d != sshbuf_len %zd.",
+ len, sshbuf_len(state->incoming_packet));
- cp = (u_char *)buffer_ptr(&active_state->incoming_packet) + len - 4;
- stored_checksum = get_u32(cp);
+ cp = sshbuf_ptr(state->incoming_packet) + len - 4;
+ stored_checksum = PEEK_U32(cp);
if (checksum != stored_checksum)
- packet_disconnect("Corrupted check bytes on input.");
- buffer_consume_end(&active_state->incoming_packet, 4);
-
- if (active_state->packet_compression) {
- buffer_clear(&active_state->compression_buffer);
- buffer_uncompress(&active_state->incoming_packet,
- &active_state->compression_buffer);
- buffer_clear(&active_state->incoming_packet);
- buffer_append(&active_state->incoming_packet,
- buffer_ptr(&active_state->compression_buffer),
- buffer_len(&active_state->compression_buffer));
- }
- active_state->p_read.packets++;
- active_state->p_read.bytes += padded_len + 4;
- type = buffer_get_char(&active_state->incoming_packet);
- if (type < SSH_MSG_MIN || type > SSH_MSG_MAX)
- packet_disconnect("Invalid ssh1 packet type: %d", type);
- return type;
+ ssh_packet_disconnect(ssh,
+ "Corrupted check bytes on input.");
+ if ((r = sshbuf_consume_end(state->incoming_packet, 4)) < 0)
+ goto out;
+
+ if (state->packet_compression) {
+ sshbuf_reset(state->compression_buffer);
+ if ((r = uncompress_buffer(ssh, state->incoming_packet,
+ state->compression_buffer)) != 0)
+ goto out;
+ sshbuf_reset(state->incoming_packet);
+ if ((r = sshbuf_putb(state->incoming_packet,
+ state->compression_buffer)) != 0)
+ goto out;
+ }
+ state->p_read.packets++;
+ state->p_read.bytes += padded_len + 4;
+ if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0)
+ goto out;
+ if (*typep < SSH_MSG_MIN || *typep > SSH_MSG_MAX)
+ ssh_packet_disconnect(ssh,
+ "Invalid ssh1 packet type: %d", *typep);
+ r = 0;
+ out:
+ return r;
}
-static int
-packet_read_poll2(u_int32_t *seqnr_p)
+int
+ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
{
+ struct session_state *state = ssh->state;
u_int padlen, need;
- u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH];
- u_int maclen, authlen = 0, aadlen = 0, block_size;
+ u_char *cp, macbuf[SSH_DIGEST_MAX_LENGTH];
+ u_int maclen, aadlen = 0, authlen = 0, block_size;
+ struct sshenc *enc = NULL;
+ struct sshmac *mac = NULL;
+ struct sshcomp *comp = NULL;
int r;
- Enc *enc = NULL;
- Mac *mac = NULL;
- Comp *comp = NULL;
- if (active_state->packet_discard)
- return SSH_MSG_NONE;
+ *typep = SSH_MSG_NONE;
+
+ if (state->packet_discard)
+ return 0;
- if (active_state->newkeys[MODE_IN] != NULL) {
- enc = &active_state->newkeys[MODE_IN]->enc;
- mac = &active_state->newkeys[MODE_IN]->mac;
- comp = &active_state->newkeys[MODE_IN]->comp;
+ if (state->newkeys[MODE_IN] != NULL) {
+ enc = &state->newkeys[MODE_IN]->enc;
+ mac = &state->newkeys[MODE_IN]->mac;
+ comp = &state->newkeys[MODE_IN]->comp;
/* disable mac for authenticated encryption */
if ((authlen = cipher_authlen(enc->cipher)) != 0)
mac = NULL;
@@ -1300,69 +1516,71 @@ packet_read_poll2(u_int32_t *seqnr_p)
block_size = enc ? enc->block_size : 8;
aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0;
- if (aadlen && active_state->packlen == 0) {
- if (cipher_get_length(&active_state->receive_context,
- &active_state->packlen,
- active_state->p_read.seqnr,
- buffer_ptr(&active_state->input),
- buffer_len(&active_state->input)) != 0)
- return SSH_MSG_NONE;
- if (active_state->packlen < 1 + 4 ||
- active_state->packlen > PACKET_MAX_SIZE) {
+ if (aadlen && state->packlen == 0) {
+ if (cipher_get_length(&state->receive_context,
+ &state->packlen, state->p_read.seqnr,
+ sshbuf_ptr(state->input), sshbuf_len(state->input)) != 0)
+ return 0;
+ if (state->packlen < 1 + 4 ||
+ state->packlen > PACKET_MAX_SIZE) {
#ifdef PACKET_DEBUG
- buffer_dump(&active_state->input);
+ sshbuf_dump(state->input, stderr);
#endif
- logit("Bad packet length %u.", active_state->packlen);
- packet_disconnect("Packet corrupt");
+ logit("Bad packet length %u.", state->packlen);
+ if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0)
+ return r;
}
- buffer_clear(&active_state->incoming_packet);
- } else if (active_state->packlen == 0) {
+ sshbuf_reset(state->incoming_packet);
+ } else if (state->packlen == 0) {
/*
* check if input size is less than the cipher block size,
* decrypt first block and extract length of incoming packet
*/
- if (buffer_len(&active_state->input) < block_size)
- return SSH_MSG_NONE;
- buffer_clear(&active_state->incoming_packet);
- cp = buffer_append_space(&active_state->incoming_packet,
- block_size);
- if (cipher_crypt(&active_state->receive_context,
- active_state->p_read.seqnr, cp,
- buffer_ptr(&active_state->input), block_size, 0, 0) != 0)
- fatal("Decryption integrity check failed");
- cp = buffer_ptr(&active_state->incoming_packet);
- active_state->packlen = get_u32(cp);
- if (active_state->packlen < 1 + 4 ||
- active_state->packlen > PACKET_MAX_SIZE) {
+ if (sshbuf_len(state->input) < block_size)
+ return 0;
+ sshbuf_reset(state->incoming_packet);
+ if ((r = sshbuf_reserve(state->incoming_packet, block_size,
+ &cp)) != 0)
+ goto out;
+ if ((r = cipher_crypt(&state->receive_context,
+ state->p_send.seqnr, cp, sshbuf_ptr(state->input),
+ block_size, 0, 0)) != 0)
+ goto out;
+ state->packlen = PEEK_U32(sshbuf_ptr(state->incoming_packet));
+ if (state->packlen < 1 + 4 ||
+ state->packlen > PACKET_MAX_SIZE) {
#ifdef PACKET_DEBUG
- buffer_dump(&active_state->incoming_packet);
+ fprintf(stderr, "input: \n");
+ sshbuf_dump(state->input, stderr);
+ fprintf(stderr, "incoming_packet: \n");
+ sshbuf_dump(state->incoming_packet, stderr);
#endif
- logit("Bad packet length %u.", active_state->packlen);
- packet_start_discard(enc, mac, active_state->packlen,
- PACKET_MAX_SIZE);
- return SSH_MSG_NONE;
+ logit("Bad packet length %u.", state->packlen);
+ return ssh_packet_start_discard(ssh, enc, mac,
+ state->packlen, PACKET_MAX_SIZE);
}
- buffer_consume(&active_state->input, block_size);
+ if ((r = sshbuf_consume(state->input, block_size)) != 0)
+ goto out;
}
- DBG(debug("input: packet len %u", active_state->packlen+4));
+ DBG(debug("input: packet len %u", state->packlen+4));
+
if (aadlen) {
/* only the payload is encrypted */
- need = active_state->packlen;
+ need = state->packlen;
} else {
/*
* the payload size and the payload are encrypted, but we
* have a partial packet of block_size bytes
*/
- need = 4 + active_state->packlen - block_size;
+ need = 4 + state->packlen - block_size;
}
DBG(debug("partial packet: block %d, need %d, maclen %d, authlen %d,"
" aadlen %d", block_size, need, maclen, authlen, aadlen));
if (need % block_size != 0) {
logit("padding error: need %d block %d mod %d",
need, block_size, need % block_size);
- packet_start_discard(enc, mac, active_state->packlen,
- PACKET_MAX_SIZE - block_size);
- return SSH_MSG_NONE;
+ return ssh_packet_start_discard(ssh, enc, mac,
+ state->packlen, PACKET_MAX_SIZE - block_size);
}
/*
* check if the entire packet has been received and
@@ -1372,171 +1590,190 @@ packet_read_poll2(u_int32_t *seqnr_p)
* 'authlen' bytes of authentication tag or
* 'maclen' bytes of message authentication code.
*/
- if (buffer_len(&active_state->input) < aadlen + need + authlen + maclen)
- return SSH_MSG_NONE;
+ if (sshbuf_len(state->input) < aadlen + need + authlen + maclen)
+ return 0;
#ifdef PACKET_DEBUG
fprintf(stderr, "read_poll enc/full: ");
- buffer_dump(&active_state->input);
+ sshbuf_dump(state->input, stderr);
#endif
/* EtM: compute mac over encrypted input */
- if (mac && mac->enabled && mac->etm)
- if ((r = mac_compute(mac, active_state->p_read.seqnr,
- buffer_ptr(&active_state->input), aadlen + need,
+ if (mac && mac->enabled && mac->etm) {
+ if ((r = mac_compute(mac, state->p_read.seqnr,
+ sshbuf_ptr(state->input), aadlen + need,
macbuf, sizeof(macbuf))) != 0)
- fatal("%s: mac_compute: %s", __func__, ssh_err(r));
- cp = buffer_append_space(&active_state->incoming_packet, aadlen + need);
- if (cipher_crypt(&active_state->receive_context,
- active_state->p_read.seqnr, cp,
- buffer_ptr(&active_state->input), need, aadlen, authlen) != 0)
- fatal("Decryption integrity check failed");
- buffer_consume(&active_state->input, aadlen + need + authlen);
+ goto out;
+ }
+ if ((r = sshbuf_reserve(state->incoming_packet, aadlen + need,
+ &cp)) != 0)
+ goto out;
+ if ((r = cipher_crypt(&state->receive_context, state->p_read.seqnr, cp,
+ sshbuf_ptr(state->input), need, aadlen, authlen)) != 0)
+ goto out;
+ if ((r = sshbuf_consume(state->input, aadlen + need + authlen)) != 0)
+ goto out;
/*
* compute MAC over seqnr and packet,
* increment sequence number for incoming packet
*/
if (mac && mac->enabled) {
if (!mac->etm)
- if ((r = mac_compute(mac, active_state->p_read.seqnr,
- buffer_ptr(&active_state->incoming_packet),
- buffer_len(&active_state->incoming_packet),
+ if ((r = mac_compute(mac, state->p_read.seqnr,
+ sshbuf_ptr(state->incoming_packet),
+ sshbuf_len(state->incoming_packet),
macbuf, sizeof(macbuf))) != 0)
- fatal("%s: mac_compute: %s", __func__, ssh_err(r));
- if (timingsafe_bcmp(macbuf, buffer_ptr(&active_state->input),
+ goto out;
+ if (timingsafe_bcmp(macbuf, sshbuf_ptr(state->input),
mac->mac_len) != 0) {
logit("Corrupted MAC on input.");
if (need > PACKET_MAX_SIZE)
- fatal("internal error need %d", need);
- packet_start_discard(enc, mac, active_state->packlen,
- PACKET_MAX_SIZE - need);
- return SSH_MSG_NONE;
+ return SSH_ERR_INTERNAL_ERROR;
+ return ssh_packet_start_discard(ssh, enc, mac,
+ state->packlen, PACKET_MAX_SIZE - need);
}
-
- DBG(debug("MAC #%d ok", active_state->p_read.seqnr));
- buffer_consume(&active_state->input, mac->mac_len);
+
+ DBG(debug("MAC #%d ok", state->p_read.seqnr));
+ if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0)
+ goto out;
}
/* XXX now it's safe to use fatal/packet_disconnect */
if (seqnr_p != NULL)
- *seqnr_p = active_state->p_read.seqnr;
- if (++active_state->p_read.seqnr == 0)
+ *seqnr_p = state->p_read.seqnr;
+ if (++state->p_read.seqnr == 0)
logit("incoming seqnr wraps around");
- if (++active_state->p_read.packets == 0)
- if (!(datafellows & SSH_BUG_NOREKEY))
- fatal("XXX too many packets with same key");
- active_state->p_read.blocks += (active_state->packlen + 4) / block_size;
- active_state->p_read.bytes += active_state->packlen + 4;
+ if (++state->p_read.packets == 0)
+ if (!(ssh->compat & SSH_BUG_NOREKEY))
+ return SSH_ERR_NEED_REKEY;
+ state->p_read.blocks += (state->packlen + 4) / block_size;
+ state->p_read.bytes += state->packlen + 4;
/* get padlen */
- cp = buffer_ptr(&active_state->incoming_packet);
- padlen = cp[4];
+ padlen = sshbuf_ptr(state->incoming_packet)[4];
DBG(debug("input: padlen %d", padlen));
if (padlen < 4)
- packet_disconnect("Corrupted padlen %d on input.", padlen);
+ ssh_packet_disconnect(ssh,
+ "Corrupted padlen %d on input.", padlen);
/* skip packet size + padlen, discard padding */
- buffer_consume(&active_state->incoming_packet, 4 + 1);
- buffer_consume_end(&active_state->incoming_packet, padlen);
+ if ((r = sshbuf_consume(state->incoming_packet, 4 + 1)) != 0 ||
+ ((r = sshbuf_consume_end(state->incoming_packet, padlen)) != 0))
+ goto out;
- DBG(debug("input: len before de-compress %d",
- buffer_len(&active_state->incoming_packet)));
+ DBG(debug("input: len before de-compress %zd",
+ sshbuf_len(state->incoming_packet)));
if (comp && comp->enabled) {
- buffer_clear(&active_state->compression_buffer);
- buffer_uncompress(&active_state->incoming_packet,
- &active_state->compression_buffer);
- buffer_clear(&active_state->incoming_packet);
- buffer_append(&active_state->incoming_packet,
- buffer_ptr(&active_state->compression_buffer),
- buffer_len(&active_state->compression_buffer));
- DBG(debug("input: len after de-compress %d",
- buffer_len(&active_state->incoming_packet)));
+ sshbuf_reset(state->compression_buffer);
+ if ((r = uncompress_buffer(ssh, state->incoming_packet,
+ state->compression_buffer)) != 0)
+ goto out;
+ sshbuf_reset(state->incoming_packet);
+ if ((r = sshbuf_putb(state->incoming_packet,
+ state->compression_buffer)) != 0)
+ goto out;
+ DBG(debug("input: len after de-compress %zd",
+ sshbuf_len(state->incoming_packet)));
}
/*
* get packet type, implies consume.
* return length of payload (without type field)
*/
- type = buffer_get_char(&active_state->incoming_packet);
- if (type < SSH2_MSG_MIN || type >= SSH2_MSG_LOCAL_MIN)
- packet_disconnect("Invalid ssh2 packet type: %d", type);
- if (type == SSH2_MSG_NEWKEYS)
- set_newkeys(MODE_IN);
- else if (type == SSH2_MSG_USERAUTH_SUCCESS &&
- !active_state->server_side)
- packet_enable_delayed_compress();
+ if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0)
+ goto out;
+ if (*typep < SSH2_MSG_MIN || *typep >= SSH2_MSG_LOCAL_MIN)
+ ssh_packet_disconnect(ssh,
+ "Invalid ssh2 packet type: %d", *typep);
+ if (*typep == SSH2_MSG_NEWKEYS)
+ r = ssh_set_newkeys(ssh, MODE_IN);
+ else if (*typep == SSH2_MSG_USERAUTH_SUCCESS && !state->server_side)
+ r = ssh_packet_enable_delayed_compress(ssh);
+ else
+ r = 0;
#ifdef PACKET_DEBUG
- fprintf(stderr, "read/plain[%d]:\r\n", type);
- buffer_dump(&active_state->incoming_packet);
+ fprintf(stderr, "read/plain[%d]:\r\n", *typep);
+ sshbuf_dump(state->incoming_packet, stderr);
#endif
/* reset for next packet */
- active_state->packlen = 0;
- return type;
+ state->packlen = 0;
+ out:
+ return r;
}
int
-packet_read_poll_seqnr(u_int32_t *seqnr_p)
+ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
{
+ struct session_state *state = ssh->state;
u_int reason, seqnr;
- u_char type;
- char *msg;
+ int r;
+ u_char *msg;
for (;;) {
+ msg = NULL;
if (compat20) {
- type = packet_read_poll2(seqnr_p);
- if (type) {
- active_state->keep_alive_timeouts = 0;
- DBG(debug("received packet type %d", type));
+ r = ssh_packet_read_poll2(ssh, typep, seqnr_p);
+ if (r != 0)
+ return r;
+ if (*typep) {
+ state->keep_alive_timeouts = 0;
+ DBG(debug("received packet type %d", *typep));
}
- switch (type) {
+ switch (*typep) {
case SSH2_MSG_IGNORE:
debug3("Received SSH2_MSG_IGNORE");
break;
case SSH2_MSG_DEBUG:
- packet_get_char();
- msg = packet_get_string(NULL);
+ if ((r = sshpkt_get_u8(ssh, NULL)) != 0 ||
+ (r = sshpkt_get_string(ssh, &msg, NULL)) != 0 ||
+ (r = sshpkt_get_string(ssh, NULL, NULL)) != 0) {
+ if (msg)
+ free(msg);
+ return r;
+ }
debug("Remote: %.900s", msg);
free(msg);
- msg = packet_get_string(NULL);
- free(msg);
break;
case SSH2_MSG_DISCONNECT:
- reason = packet_get_int();
- msg = packet_get_string(NULL);
+ if ((r = sshpkt_get_u32(ssh, &reason)) != 0 ||
+ (r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
+ return r;
/* Ignore normal client exit notifications */
- do_log2(active_state->server_side &&
+ do_log2(ssh->state->server_side &&
reason == SSH2_DISCONNECT_BY_APPLICATION ?
SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR,
"Received disconnect from %s: %u: %.400s",
- get_remote_ipaddr(), reason, msg);
+ ssh_remote_ipaddr(ssh), reason, msg);
free(msg);
- cleanup_exit(255);
- break;
+ return SSH_ERR_DISCONNECTED;
case SSH2_MSG_UNIMPLEMENTED:
- seqnr = packet_get_int();
+ if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0)
+ return r;
debug("Received SSH2_MSG_UNIMPLEMENTED for %u",
seqnr);
break;
default:
- return type;
+ return 0;
}
} else {
- type = packet_read_poll1();
- switch (type) {
+ r = ssh_packet_read_poll1(ssh, typep);
+ switch (*typep) {
case SSH_MSG_NONE:
return SSH_MSG_NONE;
case SSH_MSG_IGNORE:
break;
case SSH_MSG_DEBUG:
- msg = packet_get_string(NULL);
+ if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
+ return r;
debug("Remote: %.900s", msg);
free(msg);
break;
case SSH_MSG_DISCONNECT:
- msg = packet_get_string(NULL);
+ if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
+ return r;
error("Received disconnect from %s: %.400s",
- get_remote_ipaddr(), msg);
- cleanup_exit(255);
- break;
+ ssh_remote_ipaddr(ssh), msg);
+ free(msg);
+ return SSH_ERR_DISCONNECTED;
default:
- DBG(debug("received packet type %d", type));
- return type;
+ DBG(debug("received packet type %d", *typep));
+ return 0;
}
}
}
@@ -1548,112 +1785,29 @@ packet_read_poll_seqnr(u_int32_t *seqnr_p)
*/
void
-packet_process_incoming(const char *buf, u_int len)
+ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len)
{
- if (active_state->packet_discard) {
- active_state->keep_alive_timeouts = 0; /* ?? */
- if (len >= active_state->packet_discard)
- packet_stop_discard();
- active_state->packet_discard -= len;
+ struct session_state *state = ssh->state;
+ int r;
+
+ if (state->packet_discard) {
+ state->keep_alive_timeouts = 0; /* ?? */
+ if (len >= state->packet_discard) {
+ if ((r = ssh_packet_stop_discard(ssh)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
+ cleanup_exit(255);
+ }
+ state->packet_discard -= len;
return;
}
- buffer_append(&active_state->input, buf, len);
-}
-
-/* Returns a character from the packet. */
-
-u_int
-packet_get_char(void)
-{
- char ch;
-
- buffer_get(&active_state->incoming_packet, &ch, 1);
- return (u_char) ch;
-}
-
-/* Returns an integer from the packet data. */
-
-u_int
-packet_get_int(void)
-{
- return buffer_get_int(&active_state->incoming_packet);
-}
-
-/* Returns an 64 bit integer from the packet data. */
-
-u_int64_t
-packet_get_int64(void)
-{
- return buffer_get_int64(&active_state->incoming_packet);
-}
-
-/*
- * Returns an arbitrary precision integer from the packet data. The integer
- * must have been initialized before this call.
- */
-
-#ifdef WITH_OPENSSL
-void
-packet_get_bignum(BIGNUM * value)
-{
- buffer_get_bignum(&active_state->incoming_packet, value);
-}
-
-void
-packet_get_bignum2(BIGNUM * value)
-{
- buffer_get_bignum2(&active_state->incoming_packet, value);
-}
-
-#ifdef OPENSSL_HAS_ECC
-void
-packet_get_ecpoint(const EC_GROUP *curve, EC_POINT *point)
-{
- buffer_get_ecpoint(&active_state->incoming_packet, curve, point);
-}
-#endif
-#endif
-
-void *
-packet_get_raw(u_int *length_ptr)
-{
- u_int bytes = buffer_len(&active_state->incoming_packet);
-
- if (length_ptr != NULL)
- *length_ptr = bytes;
- return buffer_ptr(&active_state->incoming_packet);
+ if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
}
int
-packet_remaining(void)
+ssh_packet_remaining(struct ssh *ssh)
{
- return buffer_len(&active_state->incoming_packet);
-}
-
-/*
- * Returns a string from the packet data. The string is allocated using
- * xmalloc; it is the responsibility of the calling program to free it when
- * no longer needed. The length_ptr argument may be NULL, or point to an
- * integer into which the length of the string is stored.
- */
-
-void *
-packet_get_string(u_int *length_ptr)
-{
- return buffer_get_string(&active_state->incoming_packet, length_ptr);
-}
-
-const void *
-packet_get_string_ptr(u_int *length_ptr)
-{
- return buffer_get_string_ptr(&active_state->incoming_packet, length_ptr);
-}
-
-/* Ensures the returned string has no embedded \0 characters in it. */
-char *
-packet_get_cstring(u_int *length_ptr)
-{
- return buffer_get_cstring(&active_state->incoming_packet, length_ptr);
+ return sshbuf_len(ssh->state->incoming_packet);
}
/*
@@ -1666,12 +1820,13 @@ packet_get_cstring(u_int *length_ptr)
*/
void
-packet_send_debug(const char *fmt,...)
+ssh_packet_send_debug(struct ssh *ssh, const char *fmt,...)
{
char buf[1024];
va_list args;
+ int r;
- if (compat20 && (datafellows & SSH_BUG_DEBUG))
+ if (compat20 && (ssh->compat & SSH_BUG_DEBUG))
return;
va_start(args, fmt);
@@ -1679,16 +1834,19 @@ packet_send_debug(const char *fmt,...)
va_end(args);
if (compat20) {
- packet_start(SSH2_MSG_DEBUG);
- packet_put_char(0); /* bool: always display */
- packet_put_cstring(buf);
- packet_put_cstring("");
+ if ((r = sshpkt_start(ssh, SSH2_MSG_DEBUG)) != 0 ||
+ (r = sshpkt_put_u8(ssh, 0)) != 0 || /* always display */
+ (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
+ (r = sshpkt_put_cstring(ssh, "")) != 0 ||
+ (r = sshpkt_send(ssh)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
} else {
- packet_start(SSH_MSG_DEBUG);
- packet_put_cstring(buf);
+ if ((r = sshpkt_start(ssh, SSH_MSG_DEBUG)) != 0 ||
+ (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
+ (r = sshpkt_send(ssh)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
}
- packet_send();
- packet_write_wait();
+ ssh_packet_write_wait(ssh);
}
/*
@@ -1699,11 +1857,12 @@ packet_send_debug(const char *fmt,...)
*/
void
-packet_disconnect(const char *fmt,...)
+ssh_packet_disconnect(struct ssh *ssh, const char *fmt,...)
{
char buf[1024];
va_list args;
static int disconnecting = 0;
+ int r;
if (disconnecting) /* Guard against recursive invocations. */
fatal("packet_disconnect called recursively.");
@@ -1722,37 +1881,38 @@ packet_disconnect(const char *fmt,...)
/* Send the disconnect message to the other side, and wait for it to get sent. */
if (compat20) {
- packet_start(SSH2_MSG_DISCONNECT);
- packet_put_int(SSH2_DISCONNECT_PROTOCOL_ERROR);
- packet_put_cstring(buf);
- packet_put_cstring("");
+ if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
+ (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 ||
+ (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
+ (r = sshpkt_put_cstring(ssh, "")) != 0 ||
+ (r = sshpkt_send(ssh)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
} else {
- packet_start(SSH_MSG_DISCONNECT);
- packet_put_cstring(buf);
+ if ((r = sshpkt_start(ssh, SSH_MSG_DISCONNECT)) != 0 ||
+ (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
+ (r = sshpkt_send(ssh)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
}
- packet_send();
- packet_write_wait();
-
- /* Stop listening for connections. */
- channel_close_all();
+ ssh_packet_write_wait(ssh);
/* Close the connection. */
- packet_close();
+ ssh_packet_close(ssh);
cleanup_exit(255);
}
/* Checks if there is any buffered output, and tries to write some of the output. */
void
-packet_write_poll(void)
+ssh_packet_write_poll(struct ssh *ssh)
{
- int len = buffer_len(&active_state->output);
- int cont;
+ struct session_state *state = ssh->state;
+ int len = sshbuf_len(state->output);
+ int cont, r;
if (len > 0) {
cont = 0;
- len = roaming_write(active_state->connection_out,
- buffer_ptr(&active_state->output), len, &cont);
+ len = roaming_write(state->connection_out,
+ sshbuf_ptr(state->output), len, &cont);
if (len == -1) {
if (errno == EINTR || errno == EAGAIN ||
errno == EWOULDBLOCK)
@@ -1761,7 +1921,8 @@ packet_write_poll(void)
}
if (len == 0 && !cont)
fatal("Write connection closed");
- buffer_consume(&active_state->output, len);
+ if ((r = sshbuf_consume(state->output, len)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
}
}
@@ -1771,36 +1932,39 @@ packet_write_poll(void)
*/
void
-packet_write_wait(void)
+ssh_packet_write_wait(struct ssh *ssh)
{
fd_set *setp;
int ret, ms_remain = 0;
struct timeval start, timeout, *timeoutp = NULL;
+ struct session_state *state = ssh->state;
- setp = (fd_set *)xcalloc(howmany(active_state->connection_out + 1,
+ setp = (fd_set *)calloc(howmany(state->connection_out + 1,
NFDBITS), sizeof(fd_mask));
- packet_write_poll();
- while (packet_have_data_to_write()) {
- memset(setp, 0, howmany(active_state->connection_out + 1,
+ if (setp == NULL)
+ fatal("%s: calloc failed", __func__);
+ ssh_packet_write_poll(ssh);
+ while (ssh_packet_have_data_to_write(ssh)) {
+ memset(setp, 0, howmany(state->connection_out + 1,
NFDBITS) * sizeof(fd_mask));
- FD_SET(active_state->connection_out, setp);
+ FD_SET(state->connection_out, setp);
- if (active_state->packet_timeout_ms > 0) {
- ms_remain = active_state->packet_timeout_ms;
+ if (state->packet_timeout_ms > 0) {
+ ms_remain = state->packet_timeout_ms;
timeoutp = &timeout;
}
for (;;) {
- if (active_state->packet_timeout_ms != -1) {
+ if (state->packet_timeout_ms != -1) {
ms_to_timeval(&timeout, ms_remain);
gettimeofday(&start, NULL);
}
- if ((ret = select(active_state->connection_out + 1,
+ if ((ret = select(state->connection_out + 1,
NULL, setp, NULL, timeoutp)) >= 0)
break;
if (errno != EAGAIN && errno != EINTR &&
errno != EWOULDBLOCK)
break;
- if (active_state->packet_timeout_ms == -1)
+ if (state->packet_timeout_ms == -1)
continue;
ms_subtract_diff(&start, &ms_remain);
if (ms_remain <= 0) {
@@ -1810,10 +1974,10 @@ packet_write_wait(void)
}
if (ret == 0) {
logit("Connection to %.200s timed out while "
- "waiting to write", get_remote_ipaddr());
+ "waiting to write", ssh_remote_ipaddr(ssh));
cleanup_exit(255);
}
- packet_write_poll();
+ ssh_packet_write_poll(ssh);
}
free(setp);
}
@@ -1821,33 +1985,33 @@ packet_write_wait(void)
/* Returns true if there is buffered data to write to the connection. */
int
-packet_have_data_to_write(void)
+ssh_packet_have_data_to_write(struct ssh *ssh)
{
- return buffer_len(&active_state->output) != 0;
+ return sshbuf_len(ssh->state->output) != 0;
}
/* Returns true if there is not too much data to write to the connection. */
int
-packet_not_very_much_data_to_write(void)
+ssh_packet_not_very_much_data_to_write(struct ssh *ssh)
{
- if (active_state->interactive_mode)
- return buffer_len(&active_state->output) < 16384;
+ if (ssh->state->interactive_mode)
+ return sshbuf_len(ssh->state->output) < 16384;
else
- return buffer_len(&active_state->output) < 128 * 1024;
+ return sshbuf_len(ssh->state->output) < 128 * 1024;
}
-static void
-packet_set_tos(int tos)
+void
+ssh_packet_set_tos(struct ssh *ssh, int tos)
{
#ifndef IP_TOS_IS_BROKEN
- if (!packet_connection_is_on_socket())
+ if (!ssh_packet_connection_is_on_socket(ssh))
return;
- switch (packet_connection_af()) {
+ switch (ssh_packet_connection_af(ssh)) {
# ifdef IP_TOS
case AF_INET:
debug3("%s: set IP_TOS 0x%02x", __func__, tos);
- if (setsockopt(active_state->connection_in,
+ if (setsockopt(ssh->state->connection_in,
IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0)
error("setsockopt IP_TOS %d: %.100s:",
tos, strerror(errno));
@@ -1856,7 +2020,7 @@ packet_set_tos(int tos)
# ifdef IPV6_TCLASS
case AF_INET6:
debug3("%s: set IPV6_TCLASS 0x%02x", __func__, tos);
- if (setsockopt(active_state->connection_in,
+ if (setsockopt(ssh->state->connection_in,
IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) < 0)
error("setsockopt IPV6_TCLASS %d: %.100s:",
tos, strerror(errno));
@@ -1869,71 +2033,69 @@ packet_set_tos(int tos)
/* Informs that the current session is interactive. Sets IP flags for that. */
void
-packet_set_interactive(int interactive, int qos_interactive, int qos_bulk)
+ssh_packet_set_interactive(struct ssh *ssh, int interactive, int qos_interactive, int qos_bulk)
{
- if (active_state->set_interactive_called)
+ struct session_state *state = ssh->state;
+
+ if (state->set_interactive_called)
return;
- active_state->set_interactive_called = 1;
+ state->set_interactive_called = 1;
/* Record that we are in interactive mode. */
- active_state->interactive_mode = interactive;
+ state->interactive_mode = interactive;
/* Only set socket options if using a socket. */
- if (!packet_connection_is_on_socket())
+ if (!ssh_packet_connection_is_on_socket(ssh))
return;
- set_nodelay(active_state->connection_in);
- packet_set_tos(interactive ? qos_interactive : qos_bulk);
+ set_nodelay(state->connection_in);
+ ssh_packet_set_tos(ssh, interactive ? qos_interactive :
+ qos_bulk);
}
/* Returns true if the current connection is interactive. */
int
-packet_is_interactive(void)
+ssh_packet_is_interactive(struct ssh *ssh)
{
- return active_state->interactive_mode;
+ return ssh->state->interactive_mode;
}
int
-packet_set_maxsize(u_int s)
+ssh_packet_set_maxsize(struct ssh *ssh, u_int s)
{
- if (active_state->set_maxsize_called) {
+ struct session_state *state = ssh->state;
+
+ if (state->set_maxsize_called) {
logit("packet_set_maxsize: called twice: old %d new %d",
- active_state->max_packet_size, s);
+ state->max_packet_size, s);
return -1;
}
if (s < 4 * 1024 || s > 1024 * 1024) {
logit("packet_set_maxsize: bad size %d", s);
return -1;
}
- active_state->set_maxsize_called = 1;
+ state->set_maxsize_called = 1;
debug("packet_set_maxsize: setting to %d", s);
- active_state->max_packet_size = s;
+ state->max_packet_size = s;
return s;
}
int
-packet_inc_alive_timeouts(void)
+ssh_packet_inc_alive_timeouts(struct ssh *ssh)
{
- return ++active_state->keep_alive_timeouts;
+ return ++ssh->state->keep_alive_timeouts;
}
void
-packet_set_alive_timeouts(int ka)
+ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka)
{
- active_state->keep_alive_timeouts = ka;
+ ssh->state->keep_alive_timeouts = ka;
}
u_int
-packet_get_maxsize(void)
-{
- return active_state->max_packet_size;
-}
-
-/* roundup current message to pad bytes */
-void
-packet_add_padding(u_char pad)
+ssh_packet_get_maxsize(struct ssh *ssh)
{
- active_state->extra_pad = pad;
+ return ssh->state->max_packet_size;
}
/*
@@ -1948,155 +2110,702 @@ packet_add_padding(u_char pad)
* protection measure against advanced traffic analysis techniques.
*/
void
-packet_send_ignore(int nbytes)
+ssh_packet_send_ignore(struct ssh *ssh, int nbytes)
{
u_int32_t rnd = 0;
- int i;
+ int r, i;
- packet_start(compat20 ? SSH2_MSG_IGNORE : SSH_MSG_IGNORE);
- packet_put_int(nbytes);
+ if ((r = sshpkt_start(ssh, compat20 ?
+ SSH2_MSG_IGNORE : SSH_MSG_IGNORE)) != 0 ||
+ (r = sshpkt_put_u32(ssh, nbytes)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
for (i = 0; i < nbytes; i++) {
if (i % 4 == 0)
rnd = arc4random();
- packet_put_char((u_char)rnd & 0xff);
+ if ((r = sshpkt_put_u8(ssh, (u_char)rnd & 0xff)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
rnd >>= 8;
}
}
#define MAX_PACKETS (1U<<31)
int
-packet_need_rekeying(void)
+ssh_packet_need_rekeying(struct ssh *ssh)
{
- if (datafellows & SSH_BUG_NOREKEY)
+ struct session_state *state = ssh->state;
+
+ if (ssh->compat & SSH_BUG_NOREKEY)
return 0;
return
- (active_state->p_send.packets > MAX_PACKETS) ||
- (active_state->p_read.packets > MAX_PACKETS) ||
- (active_state->max_blocks_out &&
- (active_state->p_send.blocks > active_state->max_blocks_out)) ||
- (active_state->max_blocks_in &&
- (active_state->p_read.blocks > active_state->max_blocks_in)) ||
- (active_state->rekey_interval != 0 && active_state->rekey_time +
- active_state->rekey_interval <= monotime());
+ (state->p_send.packets > MAX_PACKETS) ||
+ (state->p_read.packets > MAX_PACKETS) ||
+ (state->max_blocks_out &&
+ (state->p_send.blocks > state->max_blocks_out)) ||
+ (state->max_blocks_in &&
+ (state->p_read.blocks > state->max_blocks_in)) ||
+ (state->rekey_interval != 0 && state->rekey_time +
+ state->rekey_interval <= monotime());
}
void
-packet_set_rekey_limits(u_int32_t bytes, time_t seconds)
+ssh_packet_set_rekey_limits(struct ssh *ssh, u_int32_t bytes, time_t seconds)
{
debug3("rekey after %lld bytes, %d seconds", (long long)bytes,
(int)seconds);
- active_state->rekey_limit = bytes;
- active_state->rekey_interval = seconds;
+ ssh->state->rekey_limit = bytes;
+ ssh->state->rekey_interval = seconds;
/*
* We set the time here so that in post-auth privsep slave we count
* from the completion of the authentication.
*/
- active_state->rekey_time = monotime();
+ ssh->state->rekey_time = monotime();
}
time_t
-packet_get_rekey_timeout(void)
+ssh_packet_get_rekey_timeout(struct ssh *ssh)
{
time_t seconds;
- seconds = active_state->rekey_time + active_state->rekey_interval -
+ seconds = ssh->state->rekey_time + ssh->state->rekey_interval -
monotime();
return (seconds <= 0 ? 1 : seconds);
}
void
-packet_set_server(void)
+ssh_packet_set_server(struct ssh *ssh)
{
- active_state->server_side = 1;
+ ssh->state->server_side = 1;
}
void
-packet_set_authenticated(void)
+ssh_packet_set_authenticated(struct ssh *ssh)
{
- active_state->after_authentication = 1;
+ ssh->state->after_authentication = 1;
}
void *
-packet_get_input(void)
+ssh_packet_get_input(struct ssh *ssh)
{
- return (void *)&active_state->input;
+ return (void *)ssh->state->input;
}
void *
-packet_get_output(void)
+ssh_packet_get_output(struct ssh *ssh)
{
- return (void *)&active_state->output;
-}
-
-void *
-packet_get_newkeys(int mode)
-{
- return (void *)active_state->newkeys[mode];
+ return (void *)ssh->state->output;
}
+/* XXX TODO update roaming to new API (does not work anyway) */
/*
* Save the state for the real connection, and use a separate state when
* resuming a suspended connection.
*/
void
-packet_backup_state(void)
+ssh_packet_backup_state(struct ssh *ssh,
+ struct ssh *backup_state)
{
- struct session_state *tmp;
+ struct ssh *tmp;
- close(active_state->connection_in);
- active_state->connection_in = -1;
- close(active_state->connection_out);
- active_state->connection_out = -1;
+ close(ssh->state->connection_in);
+ ssh->state->connection_in = -1;
+ close(ssh->state->connection_out);
+ ssh->state->connection_out = -1;
if (backup_state)
tmp = backup_state;
else
- tmp = alloc_session_state();
- backup_state = active_state;
- active_state = tmp;
+ tmp = ssh_alloc_session_state();
+ backup_state = ssh;
+ ssh = tmp;
}
+/* XXX FIXME FIXME FIXME */
/*
* Swap in the old state when resuming a connecion.
*/
void
-packet_restore_state(void)
+ssh_packet_restore_state(struct ssh *ssh,
+ struct ssh *backup_state)
{
- struct session_state *tmp;
- void *buf;
+ struct ssh *tmp;
u_int len;
+ int r;
tmp = backup_state;
- backup_state = active_state;
- active_state = tmp;
- active_state->connection_in = backup_state->connection_in;
- backup_state->connection_in = -1;
- active_state->connection_out = backup_state->connection_out;
- backup_state->connection_out = -1;
- len = buffer_len(&backup_state->input);
+ backup_state = ssh;
+ ssh = tmp;
+ ssh->state->connection_in = backup_state->state->connection_in;
+ backup_state->state->connection_in = -1;
+ ssh->state->connection_out = backup_state->state->connection_out;
+ backup_state->state->connection_out = -1;
+ len = sshbuf_len(backup_state->state->input);
if (len > 0) {
- buf = buffer_ptr(&backup_state->input);
- buffer_append(&active_state->input, buf, len);
- buffer_clear(&backup_state->input);
+ if ((r = sshbuf_putb(ssh->state->input,
+ backup_state->state->input)) != 0)
+ fatal("%s: %s", __func__, ssh_err(r));
+ sshbuf_reset(backup_state->state->input);
add_recv_bytes(len);
}
}
/* Reset after_authentication and reset compression in post-auth privsep */
-void
-packet_set_postauth(void)
+static int
+ssh_packet_set_postauth(struct ssh *ssh)
{
- Comp *comp;
- int mode;
+ struct sshcomp *comp;
+ int r, mode;
debug("%s: called", __func__);
/* This was set in net child, but is not visible in user child */
- active_state->after_authentication = 1;
- active_state->rekeying = 0;
+ ssh->state->after_authentication = 1;
+ ssh->state->rekeying = 0;
for (mode = 0; mode < MODE_MAX; mode++) {
- if (active_state->newkeys[mode] == NULL)
+ if (ssh->state->newkeys[mode] == NULL)
continue;
- comp = &active_state->newkeys[mode]->comp;
- if (comp && comp->enabled)
- packet_init_compression();
+ comp = &ssh->state->newkeys[mode]->comp;
+ if (comp && comp->enabled &&
+ (r = ssh_packet_init_compression(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)
+{
+ int r;
+
+ if ((r = sshbuf_put_string(m, kex->session_id,
+ kex->session_id_len)) != 0 ||
+ (r = sshbuf_put_u32(m, kex->we_need)) != 0 ||
+ (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 ||
+ (r = sshbuf_put_u32(m, kex->kex_type)) != 0 ||
+ (r = sshbuf_put_stringb(m, kex->my)) != 0 ||
+ (r = sshbuf_put_stringb(m, kex->peer)) != 0 ||
+ (r = sshbuf_put_u32(m, kex->flags)) != 0 ||
+ (r = sshbuf_put_cstring(m, kex->client_version_string)) != 0 ||
+ (r = sshbuf_put_cstring(m, kex->server_version_string)) != 0)
+ return r;
+ return 0;
+}
+
+/* turn key exchange results into a blob for packet state serialization */
+static int
+newkeys_to_blob(struct sshbuf *m, struct ssh *ssh, int mode)
+{
+ struct sshbuf *b;
+ struct sshcipher_ctx *cc;
+ struct sshcomp *comp;
+ struct sshenc *enc;
+ struct sshmac *mac;
+ struct newkeys *newkey;
+ int r;
+
+ if ((newkey = ssh->state->newkeys[mode]) == NULL)
+ return SSH_ERR_INTERNAL_ERROR;
+ enc = &newkey->enc;
+ mac = &newkey->mac;
+ comp = &newkey->comp;
+ cc = (mode == MODE_OUT) ? &ssh->state->send_context :
+ &ssh->state->receive_context;
+ if ((r = cipher_get_keyiv(cc, enc->iv, enc->iv_len)) != 0)
+ return r;
+ if ((b = sshbuf_new()) == NULL)
+ return SSH_ERR_ALLOC_FAIL;
+ /* The cipher struct is constant and shared, you export pointer */
+ if ((r = sshbuf_put_cstring(b, enc->name)) != 0 ||
+ (r = sshbuf_put(b, &enc->cipher, sizeof(enc->cipher))) != 0 ||
+ (r = sshbuf_put_u32(b, enc->enabled)) != 0 ||
+ (r = sshbuf_put_u32(b, enc->block_size)) != 0 ||
+ (r = sshbuf_put_string(b, enc->key, enc->key_len)) != 0 ||
+ (r = sshbuf_put_string(b, enc->iv, enc->iv_len)) != 0)
+ 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:
+ if (b != NULL)
+ sshbuf_free(b);
+ return r;
+}
+
+/* serialize packet state into a blob */
+int
+ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m)
+{
+ struct session_state *state = ssh->state;
+ u_char *p;
+ size_t slen, rlen;
+ int r, ssh1cipher;
+
+ if (!compat20) {
+ ssh1cipher = cipher_get_number(state->receive_context.cipher);
+ slen = cipher_get_keyiv_len(&state->send_context);
+ rlen = cipher_get_keyiv_len(&state->receive_context);
+ if ((r = sshbuf_put_u32(m, state->remote_protocol_flags)) != 0 ||
+ (r = sshbuf_put_u32(m, ssh1cipher)) != 0 ||
+ (r = sshbuf_put_string(m, state->ssh1_key, state->ssh1_keylen)) != 0 ||
+ (r = sshbuf_put_u32(m, slen)) != 0 ||
+ (r = sshbuf_reserve(m, slen, &p)) != 0 ||
+ (r = cipher_get_keyiv(&state->send_context, p, slen)) != 0 ||
+ (r = sshbuf_put_u32(m, rlen)) != 0 ||
+ (r = sshbuf_reserve(m, rlen, &p)) != 0 ||
+ (r = cipher_get_keyiv(&state->receive_context, p, rlen)) != 0)
+ return r;
+ } else {
+ if ((r = kex_to_blob(m, ssh->kex)) != 0 ||
+ (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 ||
+ (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 ||
+ (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 ||
+ (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 ||
+ (r = sshbuf_put_u32(m, state->p_send.packets)) != 0 ||
+ (r = sshbuf_put_u64(m, state->p_send.bytes)) != 0 ||
+ (r = sshbuf_put_u32(m, state->p_read.seqnr)) != 0 ||
+ (r = sshbuf_put_u64(m, state->p_read.blocks)) != 0 ||
+ (r = sshbuf_put_u32(m, state->p_read.packets)) != 0 ||
+ (r = sshbuf_put_u64(m, state->p_read.bytes)) != 0)
+ return r;
+ }
+
+ slen = cipher_get_keycontext(&state->send_context, NULL);
+ rlen = cipher_get_keycontext(&state->receive_context, NULL);
+ if ((r = sshbuf_put_u32(m, slen)) != 0 ||
+ (r = sshbuf_reserve(m, slen, &p)) != 0)
+ 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 ||
+ (r = sshbuf_put_stringb(m, state->output)) != 0)
+ return r;
+
+ if (compat20) {
+ if ((r = sshbuf_put_u64(m, get_sent_bytes())) != 0 ||
+ (r = sshbuf_put_u64(m, get_recv_bytes())) != 0)
+ return r;
+ }
+ return 0;
+}
+
+/* restore key exchange results from blob for packet state de-serialization */
+static int
+newkeys_from_blob(struct sshbuf *m, struct ssh *ssh, int mode)
+{
+ struct sshbuf *b = NULL;
+ struct sshcomp *comp;
+ struct sshenc *enc;
+ struct sshmac *mac;
+ struct newkeys *newkey = NULL;
+ size_t keylen, ivlen, maclen;
+ int r;
+
+ if ((newkey = calloc(1, sizeof(*newkey))) == NULL) {
+ r = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ if ((r = sshbuf_froms(m, &b)) != 0)
+ goto out;
+#ifdef DEBUG_PK
+ sshbuf_dump(b, stderr);
+#endif
+ enc = &newkey->enc;
+ mac = &newkey->mac;
+ comp = &newkey->comp;
+
+ if ((r = sshbuf_get_cstring(b, &enc->name, NULL)) != 0 ||
+ (r = sshbuf_get(b, &enc->cipher, sizeof(enc->cipher))) != 0 ||
+ (r = sshbuf_get_u32(b, (u_int *)&enc->enabled)) != 0 ||
+ (r = sshbuf_get_u32(b, &enc->block_size)) != 0 ||
+ (r = sshbuf_get_string(b, &enc->key, &keylen)) != 0 ||
+ (r = sshbuf_get_string(b, &enc->iv, &ivlen)) != 0)
+ goto out;
+ if (cipher_authlen(enc->cipher) == 0) {
+ if ((r = sshbuf_get_cstring(b, &mac->name, NULL)) != 0)
+ goto out;
+ if ((r = mac_setup(mac, mac->name)) != 0)
+ goto out;
+ if ((r = sshbuf_get_u32(b, (u_int *)&mac->enabled)) != 0 ||
+ (r = sshbuf_get_string(b, &mac->key, &maclen)) != 0)
+ 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) {
+ r = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+ enc->key_len = keylen;
+ enc->iv_len = ivlen;
+ ssh->kex->newkeys[mode] = newkey;
+ newkey = NULL;
+ r = 0;
+ out:
+ if (newkey != NULL)
+ free(newkey);
+ if (b != NULL)
+ sshbuf_free(b);
+ return r;
+}
+
+/* restore kex from blob for packet state de-serialization */
+static int
+kex_from_blob(struct sshbuf *m, struct kex **kexp)
+{
+ struct kex *kex;
+ int r;
+
+ if ((kex = calloc(1, sizeof(struct kex))) == NULL ||
+ (kex->my = sshbuf_new()) == NULL ||
+ (kex->peer = sshbuf_new()) == NULL) {
+ r = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ if ((r = sshbuf_get_string(m, &kex->session_id, &kex->session_id_len)) != 0 ||
+ (r = sshbuf_get_u32(m, &kex->we_need)) != 0 ||
+ (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 ||
+ (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 ||
+ (r = sshbuf_get_stringb(m, kex->my)) != 0 ||
+ (r = sshbuf_get_stringb(m, kex->peer)) != 0 ||
+ (r = sshbuf_get_u32(m, &kex->flags)) != 0 ||
+ (r = sshbuf_get_cstring(m, &kex->client_version_string, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(m, &kex->server_version_string, NULL)) != 0)
+ goto out;
+ kex->server = 1;
+ kex->done = 1;
+ r = 0;
+ out:
+ if (r != 0 || kexp == NULL) {
+ if (kex != NULL) {
+ if (kex->my != NULL)
+ sshbuf_free(kex->my);
+ if (kex->peer != NULL)
+ sshbuf_free(kex->peer);
+ free(kex);
+ }
+ if (kexp != NULL)
+ *kexp = NULL;
+ } else {
+ *kexp = kex;
+ }
+ return r;
+}
+
+/*
+ * Restore packet state from content of blob 'm' (de-serialization).
+ * Note that 'm' will be partially consumed on parsing or any other errors.
+ */
+int
+ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m)
+{
+ struct session_state *state = ssh->state;
+ const u_char *ssh1key, *ivin, *ivout, *keyin, *keyout, *input, *output;
+ size_t ssh1keylen, rlen, slen, ilen, olen;
+ int r;
+ u_int ssh1cipher = 0;
+ u_int64_t sent_bytes = 0, recv_bytes = 0;
+
+ if (!compat20) {
+ if ((r = sshbuf_get_u32(m, &state->remote_protocol_flags)) != 0 ||
+ (r = sshbuf_get_u32(m, &ssh1cipher)) != 0 ||
+ (r = sshbuf_get_string_direct(m, &ssh1key, &ssh1keylen)) != 0 ||
+ (r = sshbuf_get_string_direct(m, &ivout, &slen)) != 0 ||
+ (r = sshbuf_get_string_direct(m, &ivin, &rlen)) != 0)
+ return r;
+ if (ssh1cipher > INT_MAX)
+ return SSH_ERR_KEY_UNKNOWN_CIPHER;
+ ssh_packet_set_encryption_key(ssh, ssh1key, ssh1keylen,
+ (int)ssh1cipher);
+ if (cipher_get_keyiv_len(&state->send_context) != (int)slen ||
+ cipher_get_keyiv_len(&state->receive_context) != (int)rlen)
+ return SSH_ERR_INVALID_FORMAT;
+ if ((r = cipher_set_keyiv(&state->send_context, ivout)) != 0 ||
+ (r = cipher_set_keyiv(&state->receive_context, ivin)) != 0)
+ return r;
+ } else {
+ if ((r = kex_from_blob(m, &ssh->kex)) != 0 ||
+ (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 ||
+ (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 ||
+ (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 ||
+ (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 ||
+ (r = sshbuf_get_u32(m, &state->p_send.packets)) != 0 ||
+ (r = sshbuf_get_u64(m, &state->p_send.bytes)) != 0 ||
+ (r = sshbuf_get_u32(m, &state->p_read.seqnr)) != 0 ||
+ (r = sshbuf_get_u64(m, &state->p_read.blocks)) != 0 ||
+ (r = sshbuf_get_u32(m, &state->p_read.packets)) != 0 ||
+ (r = sshbuf_get_u64(m, &state->p_read.bytes)) != 0)
+ return r;
+ /* XXX ssh_set_newkeys overrides p_read.packets? XXX */
+ if ((r = ssh_set_newkeys(ssh, MODE_IN)) != 0 ||
+ (r = ssh_set_newkeys(ssh, MODE_OUT)) != 0)
+ return r;
+ }
+ if ((r = sshbuf_get_string_direct(m, &keyout, &slen)) != 0 ||
+ (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)
+ 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)
+ return r;
+
+ if (compat20) {
+ if ((r = sshbuf_get_u64(m, &sent_bytes)) != 0 ||
+ (r = sshbuf_get_u64(m, &recv_bytes)) != 0)
+ return r;
+ roam_set_bytes(sent_bytes, recv_bytes);
+ }
+ if (sshbuf_len(m))
+ return SSH_ERR_INVALID_FORMAT;
+ debug3("%s: done", __func__);
+ return 0;
+}
+
+/* NEW API */
+
+/* put data to the outgoing packet */
+
+int
+sshpkt_put(struct ssh *ssh, const void *v, size_t len)
+{
+ return sshbuf_put(ssh->state->outgoing_packet, v, len);
+}
+
+int
+sshpkt_putb(struct ssh *ssh, const struct sshbuf *b)
+{
+ return sshbuf_putb(ssh->state->outgoing_packet, b);
+}
+
+int
+sshpkt_put_u8(struct ssh *ssh, u_char val)
+{
+ return sshbuf_put_u8(ssh->state->outgoing_packet, val);
+}
+
+int
+sshpkt_put_u32(struct ssh *ssh, u_int32_t val)
+{
+ return sshbuf_put_u32(ssh->state->outgoing_packet, val);
+}
+
+int
+sshpkt_put_u64(struct ssh *ssh, u_int64_t val)
+{
+ return sshbuf_put_u64(ssh->state->outgoing_packet, val);
+}
+
+int
+sshpkt_put_string(struct ssh *ssh, const void *v, size_t len)
+{
+ return sshbuf_put_string(ssh->state->outgoing_packet, v, len);
+}
+
+int
+sshpkt_put_cstring(struct ssh *ssh, const void *v)
+{
+ return sshbuf_put_cstring(ssh->state->outgoing_packet, v);
+}
+
+int
+sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v)
+{
+ return sshbuf_put_stringb(ssh->state->outgoing_packet, v);
+}
+
+int
+sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g)
+{
+ return sshbuf_put_ec(ssh->state->outgoing_packet, v, g);
+}
+
+int
+sshpkt_put_bignum1(struct ssh *ssh, const BIGNUM *v)
+{
+ return sshbuf_put_bignum1(ssh->state->outgoing_packet, v);
+}
+
+int
+sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v)
+{
+ return sshbuf_put_bignum2(ssh->state->outgoing_packet, v);
+}
+
+/* fetch data from the incoming packet */
+
+int
+sshpkt_get(struct ssh *ssh, void *valp, size_t len)
+{
+ return sshbuf_get(ssh->state->incoming_packet, valp, len);
+}
+
+int
+sshpkt_get_u8(struct ssh *ssh, u_char *valp)
+{
+ return sshbuf_get_u8(ssh->state->incoming_packet, valp);
+}
+
+int
+sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp)
+{
+ return sshbuf_get_u32(ssh->state->incoming_packet, valp);
+}
+
+int
+sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp)
+{
+ return sshbuf_get_u64(ssh->state->incoming_packet, valp);
+}
+
+int
+sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp)
+{
+ return sshbuf_get_string(ssh->state->incoming_packet, valp, lenp);
+}
+
+int
+sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp)
+{
+ return sshbuf_get_string_direct(ssh->state->incoming_packet, valp, lenp);
+}
+
+int
+sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp)
+{
+ return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp);
+}
+
+int
+sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g)
+{
+ return sshbuf_get_ec(ssh->state->incoming_packet, v, g);
+}
+
+int
+sshpkt_get_bignum1(struct ssh *ssh, BIGNUM *v)
+{
+ return sshbuf_get_bignum1(ssh->state->incoming_packet, v);
+}
+
+int
+sshpkt_get_bignum2(struct ssh *ssh, BIGNUM *v)
+{
+ return sshbuf_get_bignum2(ssh->state->incoming_packet, v);
+}
+
+int
+sshpkt_get_end(struct ssh *ssh)
+{
+ if (sshbuf_len(ssh->state->incoming_packet) > 0)
+ return SSH_ERR_UNEXPECTED_TRAILING_DATA;
+ return 0;
+}
+
+const u_char *
+sshpkt_ptr(struct ssh *ssh, size_t *lenp)
+{
+ if (lenp != NULL)
+ *lenp = sshbuf_len(ssh->state->incoming_packet);
+ return sshbuf_ptr(ssh->state->incoming_packet);
+}
+
+/* start a new packet */
+
+int
+sshpkt_start(struct ssh *ssh, u_char type)
+{
+ u_char buf[9];
+ int len;
+
+ DBG(debug("packet_start[%d]", type));
+ len = compat20 ? 6 : 9;
+ memset(buf, 0, len - 1);
+ buf[len - 1] = type;
+ sshbuf_reset(ssh->state->outgoing_packet);
+ return sshbuf_put(ssh->state->outgoing_packet, buf, len);
+}
+
+/* send it */
+
+int
+sshpkt_send(struct ssh *ssh)
+{
+ if (compat20)
+ return ssh_packet_send2(ssh);
+ else
+ return ssh_packet_send1(ssh);
+}
+
+int
+sshpkt_disconnect(struct ssh *ssh, const char *fmt,...)
+{
+ char buf[1024];
+ va_list args;
+ int r;
+
+ va_start(args, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, args);
+ va_end(args);
+
+ if (compat20) {
+ if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
+ (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 ||
+ (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
+ (r = sshpkt_put_cstring(ssh, "")) != 0 ||
+ (r = sshpkt_send(ssh)) != 0)
+ return r;
+ } else {
+ if ((r = sshpkt_start(ssh, SSH_MSG_DISCONNECT)) != 0 ||
+ (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
+ (r = sshpkt_send(ssh)) != 0)
+ return r;
}
+ return 0;
+}
+
+/* roundup current message to pad bytes */
+int
+sshpkt_add_padding(struct ssh *ssh, u_char pad)
+{
+ ssh->state->extra_pad = pad;
+ return 0;
}