*/
#include "includes.h"
-RCSID("$OpenBSD: packet.c,v 1.77 2001/12/20 22:50:24 djm Exp $");
+RCSID("$OpenBSD: packet.c,v 1.115 2004/06/21 17:36:31 avsm Exp $");
+
+#include "openbsd-compat/sys-queue.h"
#include "xmalloc.h"
#include "buffer.h"
#include "mac.h"
#include "log.h"
#include "canohost.h"
+#include "misc.h"
+#include "ssh.h"
#ifdef PACKET_DEBUG
#define DBG(x) x
static CipherContext send_context;
/* Buffer for raw input data from the socket. */
-static Buffer input;
+Buffer input;
/* Buffer for raw output data going to the socket. */
-static Buffer output;
+Buffer output;
/* Buffer for the partial outgoing packet being constructed. */
static Buffer outgoing_packet;
static int packet_compression = 0;
/* default maximum packet size */
-int max_packet_size = 32768;
+u_int max_packet_size = 32768;
/* Flag indicating whether this module has been initialized. */
static int initialized = 0;
/* Session key information for Encryption and MAC */
Newkeys *newkeys[MODE_MAX];
+static struct packet_state {
+ u_int32_t seqnr;
+ u_int32_t packets;
+ u_int64_t blocks;
+} p_read, p_send;
+
+static u_int64_t max_blocks_in, max_blocks_out;
+static u_int32_t rekey_limit;
+
+/* Session key for protocol v1 */
+static u_char ssh1_key[SSH_SESSION_KEY_LENGTH];
+static u_int ssh1_keylen;
/* roundup current message to extra_pad bytes */
static u_char extra_pad = 0;
+struct packet {
+ TAILQ_ENTRY(packet) next;
+ u_char type;
+ Buffer payload;
+};
+TAILQ_HEAD(, packet) outgoing;
+
/*
* Sets the descriptors used for communication. Disables encryption until
* packet_set_encryption_key is called.
packet_set_connection(int fd_in, int fd_out)
{
Cipher *none = cipher_by_name("none");
+
if (none == NULL)
fatal("packet_set_connection: cannot load cipher 'none'");
connection_in = fd_in;
connection_out = fd_out;
- cipher_init(&send_context, none, (u_char *) "", 0, NULL, 0);
- cipher_init(&receive_context, none, (u_char *) "", 0, NULL, 0);
+ cipher_init(&send_context, none, (const u_char *)"",
+ 0, NULL, 0, CIPHER_ENCRYPT);
+ cipher_init(&receive_context, none, (const u_char *)"",
+ 0, NULL, 0, CIPHER_DECRYPT);
newkeys[MODE_IN] = newkeys[MODE_OUT] = NULL;
if (!initialized) {
initialized = 1;
buffer_init(&output);
buffer_init(&outgoing_packet);
buffer_init(&incoming_packet);
+ TAILQ_INIT(&outgoing);
}
- /* Kludge: arrange the close function to be called from fatal(). */
- fatal_add_cleanup((void (*) (void *)) packet_close, NULL);
}
/* Returns 1 if remote host is connected via socket, 0 if not. */
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;
+
+ if (mode == MODE_OUT)
+ cc = &send_context;
+ else
+ cc = &receive_context;
+
+ cipher_get_keyiv(cc, iv, len);
+}
+
+int
+packet_get_keycontext(int mode, u_char *dat)
+{
+ CipherContext *cc;
+
+ if (mode == MODE_OUT)
+ cc = &send_context;
+ else
+ cc = &receive_context;
+
+ return (cipher_get_keycontext(cc, dat));
+}
+
+void
+packet_set_keycontext(int mode, u_char *dat)
+{
+ CipherContext *cc;
+
+ if (mode == MODE_OUT)
+ cc = &send_context;
+ else
+ cc = &receive_context;
+
+ cipher_set_keycontext(cc, dat);
+}
+
+int
+packet_get_keyiv_len(int mode)
+{
+ CipherContext *cc;
+
+ if (mode == MODE_OUT)
+ cc = &send_context;
+ else
+ cc = &receive_context;
+
+ return (cipher_get_keyiv_len(cc));
+}
+void
+packet_set_iv(int mode, u_char *dat)
+{
+ CipherContext *cc;
+
+ if (mode == MODE_OUT)
+ cc = &send_context;
+ else
+ cc = &receive_context;
+
+ cipher_set_keyiv(cc, dat);
+}
+int
+packet_get_ssh1_cipher(void)
+{
+ return (cipher_get_number(receive_context.cipher));
+}
+
+void
+packet_get_state(int mode, u_int32_t *seqnr, u_int64_t *blocks, u_int32_t *packets)
+{
+ struct packet_state *state;
+
+ state = (mode == MODE_IN) ? &p_read : &p_send;
+ *seqnr = state->seqnr;
+ *blocks = state->blocks;
+ *packets = state->packets;
+}
+
+void
+packet_set_state(int mode, u_int32_t seqnr, u_int64_t blocks, u_int32_t packets)
+{
+ struct packet_state *state;
+
+ state = (mode == MODE_IN) ? &p_read : &p_send;
+ state->seqnr = seqnr;
+ state->blocks = blocks;
+ state->packets = packets;
+}
+
/* returns 1 if connection is via ipv4 */
int
memset(&to, 0, sizeof(to));
if (getsockname(connection_out, (struct sockaddr *)&to, &tolen) < 0)
return 0;
- if (to.ss_family != AF_INET)
- return 0;
- return 1;
+ if (to.ss_family == AF_INET)
+ return 1;
+#ifdef IPV4_IN_IPV6
+ if (to.ss_family == AF_INET6 &&
+ IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr))
+ return 1;
+#endif
+ return 0;
}
/* Sets the connection into non-blocking mode. */
packet_set_nonblocking(void)
{
/* Set the socket into non-blocking mode. */
- if (fcntl(connection_in, F_SETFL, O_NONBLOCK) < 0)
- error("fcntl O_NONBLOCK: %.100s", strerror(errno));
+ set_nonblock(connection_in);
- if (connection_out != connection_in) {
- if (fcntl(connection_out, F_SETFL, O_NONBLOCK) < 0)
- error("fcntl O_NONBLOCK: %.100s", strerror(errno));
- }
+ if (connection_out != connection_in)
+ set_nonblock(connection_out);
}
/* Returns the socket used for reading. */
buffer_free(&compression_buffer);
buffer_compress_uninit();
}
+ cipher_cleanup(&send_context);
+ cipher_cleanup(&receive_context);
}
/* Sets remote side protocol flags. */
* key is used for both sending and reception. However, both directions are
* encrypted independently of each other.
*/
+
void
packet_set_encryption_key(const u_char *key, u_int keylen,
int number)
{
Cipher *cipher = cipher_by_number(number);
+
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);
- cipher_init(&receive_context, cipher, key, keylen, NULL, 0);
- cipher_init(&send_context, cipher, key, keylen, NULL, 0);
+ if (keylen > SSH_SESSION_KEY_LENGTH)
+ fatal("packet_set_encryption_key: keylen too big: %d", keylen);
+ memcpy(ssh1_key, key, keylen);
+ ssh1_keylen = keylen;
+ cipher_init(&send_context, cipher, key, keylen, NULL, 0, CIPHER_ENCRYPT);
+ cipher_init(&receive_context, cipher, key, keylen, NULL, 0, CIPHER_DECRYPT);
+}
+
+u_int
+packet_get_encryption_key(u_char *key)
+{
+ if (key == NULL)
+ return (ssh1_keylen);
+ memcpy(key, ssh1_key, ssh1_keylen);
+ return (ssh1_keylen);
}
/* Start constructing a packet to send. */
packet_put_char(int value)
{
char ch = value;
+
buffer_append(&outgoing_packet, &ch, 1);
}
void
static void
packet_send1(void)
{
- char buf[8], *cp;
+ u_char buf[8], *cp;
int i, padding, len;
u_int checksum;
- u_int32_t rand = 0;
+ u_int32_t rnd = 0;
/*
* If using packet compression, compress the payload of the outgoing
/* Insert padding. Initialized to zero in packet_start1() */
padding = 8 - len % 8;
- if (send_context.cipher->number != SSH_CIPHER_NONE) {
+ if (!send_context.plaintext) {
cp = buffer_ptr(&outgoing_packet);
for (i = 0; i < padding; i++) {
if (i % 4 == 0)
- rand = arc4random();
- cp[7 - i] = rand & 0xff;
- rand >>= 8;
+ rnd = arc4random();
+ cp[7 - i] = rnd & 0xff;
+ rnd >>= 8;
}
}
buffer_consume(&outgoing_packet, 8 - padding);
/* Add check bytes. */
- checksum = ssh_crc32((u_char *) buffer_ptr(&outgoing_packet),
+ checksum = ssh_crc32(buffer_ptr(&outgoing_packet),
buffer_len(&outgoing_packet));
PUT_32BIT(buf, checksum);
buffer_append(&outgoing_packet, buf, 4);
PUT_32BIT(buf, len);
buffer_append(&output, buf, 4);
cp = buffer_append_space(&output, buffer_len(&outgoing_packet));
- cipher_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet),
+ cipher_crypt(&send_context, cp, buffer_ptr(&outgoing_packet),
buffer_len(&outgoing_packet));
#ifdef PACKET_DEBUG
*/
}
-static void
+void
set_newkeys(int mode)
{
Enc *enc;
Mac *mac;
Comp *comp;
CipherContext *cc;
+ u_int64_t *max_blocks;
+ int crypt_type;
- debug("newkeys: mode %d", mode);
+ debug2("set_newkeys: mode %d", mode);
- cc = (mode == MODE_OUT) ? &send_context : &receive_context;
+ if (mode == MODE_OUT) {
+ cc = &send_context;
+ crypt_type = CIPHER_ENCRYPT;
+ p_send.packets = p_send.blocks = 0;
+ max_blocks = &max_blocks_out;
+ } else {
+ cc = &receive_context;
+ crypt_type = CIPHER_DECRYPT;
+ p_read.packets = p_read.blocks = 0;
+ max_blocks = &max_blocks_in;
+ }
if (newkeys[mode] != NULL) {
- debug("newkeys: rekeying");
- /* todo: free old keys, reset compression/cipher-ctxt; */
- memset(cc, 0, sizeof(*cc));
+ debug("set_newkeys: rekeying");
+ cipher_cleanup(cc);
enc = &newkeys[mode]->enc;
mac = &newkeys[mode]->mac;
comp = &newkeys[mode]->comp;
if (mac->md != NULL)
mac->enabled = 1;
DBG(debug("cipher_init_context: %d", mode));
- cipher_init(cc, enc->cipher, enc->key, enc->cipher->key_len,
- enc->iv, enc->cipher->block_size);
- memset(enc->iv, 0, enc->cipher->block_size);
- memset(enc->key, 0, enc->cipher->key_len);
+ cipher_init(cc, enc->cipher, enc->key, enc->key_len,
+ enc->iv, enc->block_size, crypt_type);
+ /* Deleting the keys does not gain extra security */
+ /* memset(enc->iv, 0, enc->block_size);
+ memset(enc->key, 0, enc->key_len); */
if (comp->type != 0 && comp->enabled == 0) {
packet_init_compression();
if (mode == MODE_OUT)
buffer_compress_init_recv();
comp->enabled = 1;
}
+ /*
+ * The 2^(blocksize*2) limit is too expensive for 3DES,
+ * blowfish, etc, so enforce a 1GB limit for small blocksizes.
+ */
+ if (enc->block_size >= 16)
+ *max_blocks = (u_int64_t)1 << (enc->block_size*2);
+ else
+ *max_blocks = ((u_int64_t)1 << 30) / enc->block_size;
+ if (rekey_limit)
+ *max_blocks = MIN(*max_blocks, rekey_limit / enc->block_size);
}
/*
* Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
*/
static void
-packet_send2(void)
+packet_send2_wrapped(void)
{
- static u_int32_t seqnr = 0;
- u_char type, *ucp, *macbuf = NULL;
+ u_char type, *cp, *macbuf = NULL;
u_char padlen, pad;
- char *cp;
u_int packet_length = 0;
u_int i, len;
- u_int32_t rand = 0;
+ u_int32_t rnd = 0;
Enc *enc = NULL;
Mac *mac = NULL;
Comp *comp = NULL;
mac = &newkeys[MODE_OUT]->mac;
comp = &newkeys[MODE_OUT]->comp;
}
- block_size = enc ? enc->cipher->block_size : 8;
+ block_size = enc ? enc->block_size : 8;
- ucp = (u_char *) buffer_ptr(&outgoing_packet);
- type = ucp[5];
+ cp = buffer_ptr(&outgoing_packet);
+ type = cp[5];
#ifdef PACKET_DEBUG
fprintf(stderr, "plain: ");
/* will wrap if extra_pad+padlen > 255 */
extra_pad = roundup(extra_pad, block_size);
pad = extra_pad - ((len + padlen) % extra_pad);
- debug("packet_send2: adding %d (len %d padlen %d extra_pad %d)",
+ debug3("packet_send2: adding %d (len %d padlen %d extra_pad %d)",
pad, len, padlen, extra_pad);
padlen += pad;
extra_pad = 0;
}
cp = buffer_append_space(&outgoing_packet, padlen);
- if (enc && enc->cipher->number != SSH_CIPHER_NONE) {
+ if (enc && !send_context.plaintext) {
/* random padding */
for (i = 0; i < padlen; i++) {
if (i % 4 == 0)
- rand = arc4random();
- cp[i] = rand & 0xff;
- rand >>= 8;
+ rnd = arc4random();
+ cp[i] = rnd & 0xff;
+ rnd >>= 8;
}
} else {
/* clear padding */
}
/* packet_length includes payload, padding and padding length field */
packet_length = buffer_len(&outgoing_packet) - 4;
- ucp = (u_char *)buffer_ptr(&outgoing_packet);
- PUT_32BIT(ucp, packet_length);
- ucp[4] = padlen;
+ cp = buffer_ptr(&outgoing_packet);
+ PUT_32BIT(cp, packet_length);
+ cp[4] = padlen;
DBG(debug("send: len %d (includes padlen %d)", packet_length+4, padlen));
/* compute MAC over seqnr and packet(length fields, payload, padding) */
if (mac && mac->enabled) {
- macbuf = mac_compute(mac, seqnr,
- (u_char *) buffer_ptr(&outgoing_packet),
+ macbuf = mac_compute(mac, p_send.seqnr,
+ buffer_ptr(&outgoing_packet),
buffer_len(&outgoing_packet));
- DBG(debug("done calc MAC out #%d", seqnr));
+ DBG(debug("done calc MAC out #%d", p_send.seqnr));
}
/* encrypt packet and append to output buffer. */
cp = buffer_append_space(&output, buffer_len(&outgoing_packet));
- cipher_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet),
+ cipher_crypt(&send_context, cp, buffer_ptr(&outgoing_packet),
buffer_len(&outgoing_packet));
/* append unencrypted MAC */
if (mac && mac->enabled)
buffer_dump(&output);
#endif
/* increment sequence number for outgoing packets */
- if (++seqnr == 0)
- log("outgoing seqnr wraps around");
+ if (++p_send.seqnr == 0)
+ logit("outgoing seqnr wraps around");
+ if (++p_send.packets == 0)
+ if (!(datafellows & SSH_BUG_NOREKEY))
+ fatal("XXX too many packets with same key");
+ p_send.blocks += (packet_length + 4) / block_size;
buffer_clear(&outgoing_packet);
if (type == SSH2_MSG_NEWKEYS)
set_newkeys(MODE_OUT);
}
+static void
+packet_send2(void)
+{
+ static int rekeying = 0;
+ struct packet *p;
+ u_char type, *cp;
+
+ cp = buffer_ptr(&outgoing_packet);
+ type = cp[5];
+
+ /* during rekeying we can only send key exchange messages */
+ if (rekeying) {
+ if (!((type >= SSH2_MSG_TRANSPORT_MIN) &&
+ (type <= SSH2_MSG_TRANSPORT_MAX))) {
+ debug("enqueue packet: %u", type);
+ p = xmalloc(sizeof(*p));
+ p->type = type;
+ memcpy(&p->payload, &outgoing_packet, sizeof(Buffer));
+ buffer_init(&outgoing_packet);
+ TAILQ_INSERT_TAIL(&outgoing, p, next);
+ return;
+ }
+ }
+
+ /* rekeying starts with sending KEXINIT */
+ if (type == SSH2_MSG_KEXINIT)
+ rekeying = 1;
+
+ packet_send2_wrapped();
+
+ /* after a NEWKEYS message we can send the complete queue */
+ if (type == SSH2_MSG_NEWKEYS) {
+ rekeying = 0;
+ while ((p = TAILQ_FIRST(&outgoing))) {
+ type = p->type;
+ debug("dequeue packet: %u", type);
+ buffer_free(&outgoing_packet);
+ memcpy(&outgoing_packet, &p->payload,
+ sizeof(Buffer));
+ TAILQ_REMOVE(&outgoing, p, next);
+ xfree(p);
+ packet_send2_wrapped();
+ }
+ }
+}
+
void
packet_send(void)
{
*/
int
-packet_read_seqnr(int *payload_len_ptr, u_int32_t *seqnr_p)
+packet_read_seqnr(u_int32_t *seqnr_p)
{
int type, len;
fd_set *setp;
/* 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(payload_len_ptr, seqnr_p);
+ type = packet_read_poll_seqnr(seqnr_p);
if (!compat20 && (
type == SSH_SMSG_SUCCESS
|| type == SSH_SMSG_FAILURE
|| type == SSH_CMSG_EOF
|| type == SSH_CMSG_EXIT_CONFIRMATION))
- packet_integrity_check(*payload_len_ptr, 0, type);
+ packet_check_eom();
/* If we got a packet, return it. */
if (type != SSH_MSG_NONE) {
xfree(setp);
/* Read data from the socket. */
len = read(connection_in, buf, sizeof(buf));
if (len == 0) {
- log("Connection closed by %.200s", get_remote_ipaddr());
- fatal_cleanup();
+ logit("Connection closed by %.200s", get_remote_ipaddr());
+ cleanup_exit(255);
}
if (len < 0)
fatal("Read from socket failed: %.100s", strerror(errno));
}
int
-packet_read(int *payload_len_ptr)
+packet_read(void)
{
- return packet_read_seqnr(payload_len_ptr, NULL);
+ return packet_read_seqnr(NULL);
}
/*
*/
void
-packet_read_expect(int *payload_len_ptr, int expected_type)
+packet_read_expect(int expected_type)
{
int type;
- type = packet_read(payload_len_ptr);
+ type = packet_read();
if (type != expected_type)
packet_disconnect("Protocol error: expected packet type %d, got %d",
expected_type, type);
* SSH_MSG_DISCONNECT is handled specially here. Also,
* SSH_MSG_IGNORE messages are skipped by this function and are never returned
* to higher levels.
- *
- * The returned payload_len does include space consumed by:
- * Packet length
- * Padding
- * Packet type
- * Check bytes
*/
static int
-packet_read_poll1(int *payload_len_ptr)
+packet_read_poll1(void)
{
u_int len, padded_len;
- u_char *ucp, type;
- char *cp;
+ u_char *cp, type;
u_int checksum, stored_checksum;
/* Check if input size is less than minimum packet size. */
if (buffer_len(&input) < 4 + 8)
return SSH_MSG_NONE;
/* Get length of incoming packet. */
- ucp = (u_char *) buffer_ptr(&input);
- len = GET_32BIT(ucp);
+ cp = buffer_ptr(&input);
+ len = GET_32BIT(cp);
if (len < 1 + 2 + 2 || len > 256 * 1024)
- packet_disconnect("Bad packet length %d.", len);
+ packet_disconnect("Bad packet length %u.", len);
padded_len = (len + 8) & ~7;
/* Check if the packet has been entirely received. */
* (C)1998 CORE-SDI, Buenos Aires Argentina
* Ariel Futoransky(futo@core-sdi.com)
*/
- if (receive_context.cipher->number != SSH_CIPHER_NONE &&
+ if (!receive_context.plaintext &&
detect_attack(buffer_ptr(&input), padded_len, NULL) == DEATTACK_DETECTED)
packet_disconnect("crc32 compensation attack: network attack detected");
/* Decrypt data to incoming_packet. */
buffer_clear(&incoming_packet);
cp = buffer_append_space(&incoming_packet, padded_len);
- cipher_decrypt(&receive_context, cp, buffer_ptr(&input), padded_len);
+ cipher_crypt(&receive_context, cp, buffer_ptr(&input), padded_len);
buffer_consume(&input, padded_len);
#endif
/* Compute packet checksum. */
- checksum = ssh_crc32((u_char *) buffer_ptr(&incoming_packet),
+ checksum = ssh_crc32(buffer_ptr(&incoming_packet),
buffer_len(&incoming_packet) - 4);
/* Skip padding. */
packet_disconnect("packet_read_poll1: len %d != buffer_len %d.",
len, buffer_len(&incoming_packet));
- ucp = (u_char *) buffer_ptr(&incoming_packet) + len - 4;
- stored_checksum = GET_32BIT(ucp);
+ cp = (u_char *)buffer_ptr(&incoming_packet) + len - 4;
+ stored_checksum = GET_32BIT(cp);
if (checksum != stored_checksum)
packet_disconnect("Corrupted check bytes on input.");
buffer_consume_end(&incoming_packet, 4);
buffer_len(&compression_buffer));
}
type = buffer_get_char(&incoming_packet);
- *payload_len_ptr = buffer_len(&incoming_packet);
return type;
}
static int
-packet_read_poll2(int *payload_len_ptr, u_int32_t *seqnr_p)
+packet_read_poll2(u_int32_t *seqnr_p)
{
- static u_int32_t seqnr = 0;
static u_int packet_length = 0;
u_int padlen, need;
- u_char *macbuf, *ucp, type;
- char *cp;
+ u_char *macbuf, *cp, type;
int maclen, block_size;
Enc *enc = NULL;
Mac *mac = NULL;
comp = &newkeys[MODE_IN]->comp;
}
maclen = mac && mac->enabled ? mac->mac_len : 0;
- block_size = enc ? enc->cipher->block_size : 8;
+ block_size = enc ? enc->block_size : 8;
if (packet_length == 0) {
/*
return SSH_MSG_NONE;
buffer_clear(&incoming_packet);
cp = buffer_append_space(&incoming_packet, block_size);
- cipher_decrypt(&receive_context, cp, buffer_ptr(&input),
+ cipher_crypt(&receive_context, cp, buffer_ptr(&input),
block_size);
- ucp = (u_char *) buffer_ptr(&incoming_packet);
- packet_length = GET_32BIT(ucp);
+ cp = buffer_ptr(&incoming_packet);
+ packet_length = GET_32BIT(cp);
if (packet_length < 1 + 4 || packet_length > 256 * 1024) {
+#ifdef PACKET_DEBUG
buffer_dump(&incoming_packet);
- packet_disconnect("Bad packet length %d.", packet_length);
+#endif
+ packet_disconnect("Bad packet length %u.", packet_length);
}
- DBG(debug("input: packet len %d", packet_length+4));
+ DBG(debug("input: packet len %u", packet_length+4));
buffer_consume(&input, block_size);
}
/* we have a partial packet of block_size bytes */
buffer_dump(&input);
#endif
cp = buffer_append_space(&incoming_packet, need);
- cipher_decrypt(&receive_context, cp, buffer_ptr(&input), need);
+ cipher_crypt(&receive_context, cp, buffer_ptr(&input), need);
buffer_consume(&input, need);
/*
* compute MAC over seqnr and packet,
* increment sequence number for incoming packet
*/
if (mac && mac->enabled) {
- macbuf = mac_compute(mac, seqnr,
- (u_char *) buffer_ptr(&incoming_packet),
+ macbuf = mac_compute(mac, p_read.seqnr,
+ buffer_ptr(&incoming_packet),
buffer_len(&incoming_packet));
if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0)
packet_disconnect("Corrupted MAC on input.");
- DBG(debug("MAC #%d ok", seqnr));
+ DBG(debug("MAC #%d ok", p_read.seqnr));
buffer_consume(&input, mac->mac_len);
}
if (seqnr_p != NULL)
- *seqnr_p = seqnr;
- if (++seqnr == 0)
- log("incoming seqnr wraps around");
+ *seqnr_p = p_read.seqnr;
+ if (++p_read.seqnr == 0)
+ logit("incoming seqnr wraps around");
+ if (++p_read.packets == 0)
+ if (!(datafellows & SSH_BUG_NOREKEY))
+ fatal("XXX too many packets with same key");
+ p_read.blocks += (packet_length + 4) / block_size;
/* get padlen */
cp = buffer_ptr(&incoming_packet);
- cp += 4;
- padlen = (u_char) *cp;
+ padlen = cp[4];
DBG(debug("input: padlen %d", padlen));
if (padlen < 4)
packet_disconnect("Corrupted padlen %d on input.", padlen);
buffer_clear(&incoming_packet);
buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
buffer_len(&compression_buffer));
- DBG(debug("input: len after de-compress %d", buffer_len(&incoming_packet)));
+ DBG(debug("input: len after de-compress %d",
+ buffer_len(&incoming_packet)));
}
/*
* get packet type, implies consume.
type = buffer_get_char(&incoming_packet);
if (type == SSH2_MSG_NEWKEYS)
set_newkeys(MODE_IN);
- *payload_len_ptr = buffer_len(&incoming_packet);
#ifdef PACKET_DEBUG
fprintf(stderr, "read/plain[%d]:\r\n", type);
buffer_dump(&incoming_packet);
}
int
-packet_read_poll_seqnr(int *payload_len_ptr, u_int32_t *seqnr_p)
+packet_read_poll_seqnr(u_int32_t *seqnr_p)
{
- int reason;
+ u_int reason, seqnr;
u_char type;
char *msg;
for (;;) {
if (compat20) {
- type = packet_read_poll2(payload_len_ptr, seqnr_p);
+ type = packet_read_poll2(seqnr_p);
if (type)
DBG(debug("received packet type %d", type));
switch (type) {
case SSH2_MSG_DISCONNECT:
reason = packet_get_int();
msg = packet_get_string(NULL);
- log("Received disconnect from %s: %d: %.400s", get_remote_ipaddr(),
- reason, msg);
+ logit("Received disconnect from %s: %u: %.400s",
+ get_remote_ipaddr(), reason, msg);
xfree(msg);
- fatal_cleanup();
+ cleanup_exit(255);
+ break;
+ case SSH2_MSG_UNIMPLEMENTED:
+ seqnr = packet_get_int();
+ debug("Received SSH2_MSG_UNIMPLEMENTED for %u",
+ seqnr);
break;
default:
return type;
break;
}
} else {
- type = packet_read_poll1(payload_len_ptr);
+ type = packet_read_poll1();
switch (type) {
case SSH_MSG_IGNORE:
break;
break;
case SSH_MSG_DISCONNECT:
msg = packet_get_string(NULL);
- log("Received disconnect from %s: %.400s", get_remote_ipaddr(),
- msg);
- fatal_cleanup();
+ logit("Received disconnect from %s: %.400s",
+ get_remote_ipaddr(), msg);
+ cleanup_exit(255);
xfree(msg);
break;
default:
}
int
-packet_read_poll(int *payload_len_ptr)
+packet_read_poll(void)
{
- return packet_read_poll_seqnr(payload_len_ptr, NULL);
+ return packet_read_poll_seqnr(NULL);
}
/*
packet_get_char(void)
{
char ch;
+
buffer_get(&incoming_packet, &ch, 1);
return (u_char) ch;
}
*/
void
-packet_get_bignum(BIGNUM * value, int *length_ptr)
+packet_get_bignum(BIGNUM * value)
{
- *length_ptr = buffer_get_bignum(&incoming_packet, value);
+ buffer_get_bignum(&incoming_packet, value);
}
void
-packet_get_bignum2(BIGNUM * value, int *length_ptr)
+packet_get_bignum2(BIGNUM * value)
{
- *length_ptr = buffer_get_bignum2(&incoming_packet, value);
+ buffer_get_bignum2(&incoming_packet, value);
}
void *
packet_get_raw(int *length_ptr)
{
int bytes = buffer_len(&incoming_packet);
+
if (length_ptr != NULL)
*length_ptr = bytes;
return buffer_ptr(&incoming_packet);
char buf[1024];
va_list args;
static int disconnecting = 0;
+
if (disconnecting) /* Guard against recursive invocations. */
fatal("packet_disconnect called recursively.");
disconnecting = 1;
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
+ /* Display the error locally */
+ logit("Disconnecting: %.100s", buf);
+
/* Send the disconnect message to the other side, and wait for it to get sent. */
if (compat20) {
packet_start(SSH2_MSG_DISCONNECT);
/* Close the connection. */
packet_close();
-
- /* Display the error locally and exit. */
- log("Disconnecting: %.100s", buf);
- fatal_cleanup();
+ cleanup_exit(255);
}
/* Checks if there is any buffered output, and tries to write some of the output. */
packet_write_poll(void)
{
int len = buffer_len(&output);
+
if (len > 0) {
len = write(connection_out, buffer_ptr(&output), len);
if (len <= 0) {
return buffer_len(&output) < 128 * 1024;
}
+
+static void
+packet_set_tos(int interactive)
+{
+#if defined(IP_TOS) && !defined(IP_TOS_IS_BROKEN)
+ int tos = interactive ? IPTOS_LOWDELAY : IPTOS_THROUGHPUT;
+
+ if (!packet_connection_is_on_socket() ||
+ !packet_connection_is_ipv4())
+ return;
+ if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, &tos,
+ sizeof(tos)) < 0)
+ error("setsockopt IP_TOS %d: %.100s:",
+ tos, strerror(errno));
+#endif
+}
+
/* Informs that the current session is interactive. Sets IP flags for that. */
void
packet_set_interactive(int interactive)
{
static int called = 0;
-#if defined(IP_TOS) && !defined(IP_TOS_IS_BROKEN)
- int lowdelay = IPTOS_LOWDELAY;
- int throughput = IPTOS_THROUGHPUT;
-#endif
- int on = 1;
if (called)
return;
/* Only set socket options if using a socket. */
if (!packet_connection_is_on_socket())
return;
- /*
- * IPTOS_LOWDELAY and IPTOS_THROUGHPUT are IPv4 only
- */
- if (interactive) {
- /*
- * Set IP options for an interactive connection. Use
- * IPTOS_LOWDELAY and TCP_NODELAY.
- */
-#if defined(IP_TOS) && !defined(IP_TOS_IS_BROKEN)
- if (packet_connection_is_ipv4()) {
- if (setsockopt(connection_in, IPPROTO_IP, IP_TOS,
- (void *) &lowdelay, sizeof(lowdelay)) < 0)
- error("setsockopt IPTOS_LOWDELAY: %.100s",
- strerror(errno));
- }
-#endif
- if (setsockopt(connection_in, IPPROTO_TCP, TCP_NODELAY, (void *) &on,
- sizeof(on)) < 0)
- error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
- } else if (packet_connection_is_ipv4()) {
- /*
- * Set IP options for a non-interactive connection. Use
- * IPTOS_THROUGHPUT.
- */
-#if defined(IP_TOS) && !defined(IP_TOS_IS_BROKEN)
- if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &throughput,
- sizeof(throughput)) < 0)
- error("setsockopt IPTOS_THROUGHPUT: %.100s", strerror(errno));
-#endif
- }
+ if (interactive)
+ set_nodelay(connection_in);
+ packet_set_tos(interactive);
}
/* Returns true if the current connection is interactive. */
}
int
-packet_set_maxsize(int s)
+packet_set_maxsize(u_int s)
{
static int called = 0;
+
if (called) {
- log("packet_set_maxsize: called twice: old %d new %d",
+ logit("packet_set_maxsize: called twice: old %d new %d",
max_packet_size, s);
return -1;
}
if (s < 4 * 1024 || s > 1024 * 1024) {
- log("packet_set_maxsize: bad size %d", s);
+ logit("packet_set_maxsize: bad size %d", s);
return -1;
}
called = 1;
void
packet_send_ignore(int nbytes)
{
- u_int32_t rand = 0;
+ u_int32_t rnd = 0;
int i;
packet_start(compat20 ? SSH2_MSG_IGNORE : SSH_MSG_IGNORE);
packet_put_int(nbytes);
for (i = 0; i < nbytes; i++) {
if (i % 4 == 0)
- rand = arc4random();
- packet_put_char(rand & 0xff);
- rand >>= 8;
+ rnd = arc4random();
+ packet_put_char(rnd & 0xff);
+ rnd >>= 8;
}
}
+
+#define MAX_PACKETS (1U<<31)
+int
+packet_need_rekeying(void)
+{
+ if (datafellows & SSH_BUG_NOREKEY)
+ return 0;
+ return
+ (p_send.packets > MAX_PACKETS) ||
+ (p_read.packets > MAX_PACKETS) ||
+ (max_blocks_out && (p_send.blocks > max_blocks_out)) ||
+ (max_blocks_in && (p_read.blocks > max_blocks_in));
+}
+
+void
+packet_set_rekey_limit(u_int32_t bytes)
+{
+ rekey_limit = bytes;
+}