version 1.38, 2000/10/12 14:21:12 |
version 1.38.2.2, 2001/02/19 17:19:09 |
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#include "buffer.h" |
#include "buffer.h" |
#include "packet.h" |
#include "packet.h" |
#include "bufaux.h" |
#include "bufaux.h" |
#include "ssh.h" |
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#include "crc32.h" |
#include "crc32.h" |
#include "getput.h" |
#include "getput.h" |
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#include "channels.h" |
#include "channels.h" |
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#include "compat.h" |
#include "compat.h" |
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#include "ssh1.h" |
#include "ssh2.h" |
#include "ssh2.h" |
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#include <openssl/bn.h> |
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#include <openssl/dh.h> |
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#include <openssl/hmac.h> |
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#include "buffer.h" |
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#include "cipher.h" |
#include "cipher.h" |
#include "kex.h" |
#include "kex.h" |
#include "hmac.h" |
#include "mac.h" |
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#include "log.h" |
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#include "canohost.h" |
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#ifdef PACKET_DEBUG |
#ifdef PACKET_DEBUG |
#define DBG(x) x |
#define DBG(x) x |
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static int cipher_type = SSH_CIPHER_NONE; |
static int cipher_type = SSH_CIPHER_NONE; |
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/* Protocol flags for the remote side. */ |
/* Protocol flags for the remote side. */ |
static unsigned int remote_protocol_flags = 0; |
static u_int remote_protocol_flags = 0; |
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/* Encryption context for receiving data. This is only used for decryption. */ |
/* Encryption context for receiving data. This is only used for decryption. */ |
static CipherContext receive_context; |
static CipherContext receive_context; |
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connection_in = fd_in; |
connection_in = fd_in; |
connection_out = fd_out; |
connection_out = fd_out; |
cipher_type = SSH_CIPHER_NONE; |
cipher_type = SSH_CIPHER_NONE; |
cipher_init(&send_context, none, (unsigned char *) "", 0, NULL, 0); |
cipher_init(&send_context, none, (u_char *) "", 0, NULL, 0); |
cipher_init(&receive_context, none, (unsigned char *) "", 0, NULL, 0); |
cipher_init(&receive_context, none, (u_char *) "", 0, NULL, 0); |
if (!initialized) { |
if (!initialized) { |
initialized = 1; |
initialized = 1; |
buffer_init(&input); |
buffer_init(&input); |
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/* Sets remote side protocol flags. */ |
/* Sets remote side protocol flags. */ |
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void |
void |
packet_set_protocol_flags(unsigned int protocol_flags) |
packet_set_protocol_flags(u_int protocol_flags) |
{ |
{ |
remote_protocol_flags = protocol_flags; |
remote_protocol_flags = protocol_flags; |
channel_set_options((protocol_flags & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) != 0); |
channel_set_options((protocol_flags & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) != 0); |
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/* Returns the remote protocol flags set earlier by the above function. */ |
/* Returns the remote protocol flags set earlier by the above function. */ |
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unsigned int |
u_int |
packet_get_protocol_flags() |
packet_get_protocol_flags() |
{ |
{ |
return remote_protocol_flags; |
return remote_protocol_flags; |
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void |
void |
packet_encrypt(CipherContext * cc, void *dest, void *src, |
packet_encrypt(CipherContext * cc, void *dest, void *src, |
unsigned int bytes) |
u_int bytes) |
{ |
{ |
cipher_encrypt(cc, dest, src, bytes); |
cipher_encrypt(cc, dest, src, bytes); |
} |
} |
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*/ |
*/ |
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void |
void |
packet_decrypt(CipherContext *context, void *dest, void *src, unsigned int bytes) |
packet_decrypt(CipherContext *context, void *dest, void *src, u_int bytes) |
{ |
{ |
/* |
/* |
* Cryptographic attack detector for ssh - Modifications for packet.c |
* Cryptographic attack detector for ssh - Modifications for packet.c |
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*/ |
*/ |
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void |
void |
packet_set_encryption_key(const unsigned char *key, unsigned int keylen, |
packet_set_encryption_key(const u_char *key, u_int keylen, |
int number) |
int number) |
{ |
{ |
Cipher *cipher = cipher_by_number(number); |
Cipher *cipher = cipher_by_number(number); |
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/* Appends an integer to the packet data. */ |
/* Appends an integer to the packet data. */ |
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void |
void |
packet_put_int(unsigned int value) |
packet_put_int(u_int value) |
{ |
{ |
buffer_put_int(&outgoing_packet, value); |
buffer_put_int(&outgoing_packet, value); |
} |
} |
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/* Appends a string to packet data. */ |
/* Appends a string to packet data. */ |
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void |
void |
packet_put_string(const char *buf, unsigned int len) |
packet_put_string(const char *buf, u_int len) |
{ |
{ |
buffer_put_string(&outgoing_packet, buf, len); |
buffer_put_string(&outgoing_packet, buf, len); |
} |
} |
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} |
} |
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void |
void |
packet_put_raw(const char *buf, unsigned int len) |
packet_put_raw(const char *buf, u_int len) |
{ |
{ |
buffer_append(&outgoing_packet, buf, len); |
buffer_append(&outgoing_packet, buf, len); |
} |
} |
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*/ |
*/ |
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void |
void |
packet_send1() |
packet_send1(void) |
{ |
{ |
char buf[8], *cp; |
char buf[8], *cp; |
int i, padding, len; |
int i, padding, len; |
unsigned int checksum; |
u_int checksum; |
u_int32_t rand = 0; |
u_int32_t rand = 0; |
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/* |
/* |
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buffer_consume(&outgoing_packet, 8 - padding); |
buffer_consume(&outgoing_packet, 8 - padding); |
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/* Add check bytes. */ |
/* Add check bytes. */ |
checksum = ssh_crc32((unsigned char *) buffer_ptr(&outgoing_packet), |
checksum = ssh_crc32((u_char *) buffer_ptr(&outgoing_packet), |
buffer_len(&outgoing_packet)); |
buffer_len(&outgoing_packet)); |
PUT_32BIT(buf, checksum); |
PUT_32BIT(buf, checksum); |
buffer_append(&outgoing_packet, buf, 4); |
buffer_append(&outgoing_packet, buf, 4); |
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* Finalize packet in SSH2 format (compress, mac, encrypt, enqueue) |
* Finalize packet in SSH2 format (compress, mac, encrypt, enqueue) |
*/ |
*/ |
void |
void |
packet_send2() |
packet_send2(void) |
{ |
{ |
unsigned char *macbuf = NULL; |
static u_int32_t seqnr = 0; |
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u_char *macbuf = NULL; |
char *cp; |
char *cp; |
unsigned int packet_length = 0; |
u_int packet_length = 0; |
unsigned int i, padlen, len; |
u_int i, padlen, len; |
u_int32_t rand = 0; |
u_int32_t rand = 0; |
static unsigned int seqnr = 0; |
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int type; |
int type; |
Enc *enc = NULL; |
Enc *enc = NULL; |
Mac *mac = NULL; |
Mac *mac = NULL; |
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/* compute MAC over seqnr and packet(length fields, payload, padding) */ |
/* compute MAC over seqnr and packet(length fields, payload, padding) */ |
if (mac && mac->enabled) { |
if (mac && mac->enabled) { |
macbuf = hmac( mac->md, seqnr, |
macbuf = mac_compute(mac, seqnr, |
(unsigned char *) buffer_ptr(&outgoing_packet), |
(u_char *) buffer_ptr(&outgoing_packet), |
buffer_len(&outgoing_packet), |
buffer_len(&outgoing_packet)); |
mac->key, mac->key_len |
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); |
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DBG(debug("done calc MAC out #%d", seqnr)); |
DBG(debug("done calc MAC out #%d", seqnr)); |
} |
} |
/* encrypt packet and append to output buffer. */ |
/* encrypt packet and append to output buffer. */ |
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FD_SET(connection_in, &set); |
FD_SET(connection_in, &set); |
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/* Wait for some data to arrive. */ |
/* Wait for some data to arrive. */ |
select(connection_in + 1, &set, NULL, NULL, NULL); |
while (select(connection_in + 1, &set, NULL, NULL, NULL) == -1 && |
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(errno == EAGAIN || errno == EINTR)) |
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; |
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/* Read data from the socket. */ |
/* Read data from the socket. */ |
len = read(connection_in, buf, sizeof(buf)); |
len = read(connection_in, buf, sizeof(buf)); |
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int |
int |
packet_read_poll1(int *payload_len_ptr) |
packet_read_poll1(int *payload_len_ptr) |
{ |
{ |
unsigned int len, padded_len; |
u_int len, padded_len; |
unsigned char *ucp; |
u_char *ucp; |
char buf[8], *cp; |
char buf[8], *cp; |
unsigned int checksum, stored_checksum; |
u_int checksum, stored_checksum; |
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/* Check if input size is less than minimum packet size. */ |
/* Check if input size is less than minimum packet size. */ |
if (buffer_len(&input) < 4 + 8) |
if (buffer_len(&input) < 4 + 8) |
return SSH_MSG_NONE; |
return SSH_MSG_NONE; |
/* Get length of incoming packet. */ |
/* Get length of incoming packet. */ |
ucp = (unsigned char *) buffer_ptr(&input); |
ucp = (u_char *) buffer_ptr(&input); |
len = GET_32BIT(ucp); |
len = GET_32BIT(ucp); |
if (len < 1 + 2 + 2 || len > 256 * 1024) |
if (len < 1 + 2 + 2 || len > 256 * 1024) |
packet_disconnect("Bad packet length %d.", len); |
packet_disconnect("Bad packet length %d.", len); |
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#endif |
#endif |
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/* Compute packet checksum. */ |
/* Compute packet checksum. */ |
checksum = ssh_crc32((unsigned char *) buffer_ptr(&incoming_packet), |
checksum = ssh_crc32((u_char *) buffer_ptr(&incoming_packet), |
buffer_len(&incoming_packet) - 4); |
buffer_len(&incoming_packet) - 4); |
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/* Skip padding. */ |
/* Skip padding. */ |
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packet_disconnect("packet_read_poll: len %d != buffer_len %d.", |
packet_disconnect("packet_read_poll: len %d != buffer_len %d.", |
len, buffer_len(&incoming_packet)); |
len, buffer_len(&incoming_packet)); |
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ucp = (unsigned char *) buffer_ptr(&incoming_packet) + len - 4; |
ucp = (u_char *) buffer_ptr(&incoming_packet) + len - 4; |
stored_checksum = GET_32BIT(ucp); |
stored_checksum = GET_32BIT(ucp); |
if (checksum != stored_checksum) |
if (checksum != stored_checksum) |
packet_disconnect("Corrupted check bytes on input."); |
packet_disconnect("Corrupted check bytes on input."); |
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*payload_len_ptr = buffer_len(&incoming_packet); |
*payload_len_ptr = buffer_len(&incoming_packet); |
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/* Return type. */ |
/* Return type. */ |
return (unsigned char) buf[0]; |
return (u_char) buf[0]; |
} |
} |
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int |
int |
packet_read_poll2(int *payload_len_ptr) |
packet_read_poll2(int *payload_len_ptr) |
{ |
{ |
unsigned int padlen, need; |
static u_int32_t seqnr = 0; |
unsigned char buf[8], *macbuf; |
static u_int packet_length = 0; |
unsigned char *ucp; |
u_int padlen, need; |
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u_char buf[8], *macbuf; |
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u_char *ucp; |
char *cp; |
char *cp; |
static unsigned int packet_length = 0; |
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static unsigned int seqnr = 0; |
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int type; |
int type; |
int maclen, block_size; |
int maclen, block_size; |
Enc *enc = NULL; |
Enc *enc = NULL; |
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buffer_append_space(&incoming_packet, &cp, block_size); |
buffer_append_space(&incoming_packet, &cp, block_size); |
packet_decrypt(&receive_context, cp, buffer_ptr(&input), |
packet_decrypt(&receive_context, cp, buffer_ptr(&input), |
block_size); |
block_size); |
ucp = (unsigned char *) buffer_ptr(&incoming_packet); |
ucp = (u_char *) buffer_ptr(&incoming_packet); |
packet_length = GET_32BIT(ucp); |
packet_length = GET_32BIT(ucp); |
if (packet_length < 1 + 4 || packet_length > 256 * 1024) { |
if (packet_length < 1 + 4 || packet_length > 256 * 1024) { |
buffer_dump(&incoming_packet); |
buffer_dump(&incoming_packet); |
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* increment sequence number for incoming packet |
* increment sequence number for incoming packet |
*/ |
*/ |
if (mac && mac->enabled) { |
if (mac && mac->enabled) { |
macbuf = hmac( mac->md, seqnr, |
macbuf = mac_compute(mac, seqnr, |
(unsigned char *) buffer_ptr(&incoming_packet), |
(u_char *) buffer_ptr(&incoming_packet), |
buffer_len(&incoming_packet), |
buffer_len(&incoming_packet)); |
mac->key, mac->key_len |
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); |
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if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0) |
if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0) |
packet_disconnect("Corrupted MAC on input."); |
packet_disconnect("Corrupted MAC on input."); |
DBG(debug("MAC #%d ok", seqnr)); |
DBG(debug("MAC #%d ok", seqnr)); |
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packet_length = 0; |
packet_length = 0; |
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/* extract packet type */ |
/* extract packet type */ |
type = (unsigned char)buf[0]; |
type = (u_char)buf[0]; |
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if (type == SSH2_MSG_NEWKEYS) { |
if (type == SSH2_MSG_NEWKEYS) { |
if (kex==NULL || mac==NULL || enc==NULL || comp==NULL) |
if (kex==NULL || mac==NULL || enc==NULL || comp==NULL) |
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fprintf(stderr, "read/plain[%d]:\r\n",type); |
fprintf(stderr, "read/plain[%d]:\r\n",type); |
buffer_dump(&incoming_packet); |
buffer_dump(&incoming_packet); |
#endif |
#endif |
return (unsigned char)type; |
return (u_char)type; |
} |
} |
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int |
int |
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case SSH2_MSG_DISCONNECT: |
case SSH2_MSG_DISCONNECT: |
reason = packet_get_int(); |
reason = packet_get_int(); |
msg = packet_get_string(NULL); |
msg = packet_get_string(NULL); |
log("Received disconnect: %d: %.900s", reason, msg); |
log("Received disconnect from %s: %d: %.400s", get_remote_ipaddr(), |
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reason, msg); |
xfree(msg); |
xfree(msg); |
fatal_cleanup(); |
fatal_cleanup(); |
break; |
break; |
default: |
default: |
return type; |
return type; |
break; |
break; |
} |
} |
} else { |
} else { |
switch(type) { |
switch(type) { |
case SSH_MSG_IGNORE: |
case SSH_MSG_IGNORE: |
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break; |
break; |
case SSH_MSG_DISCONNECT: |
case SSH_MSG_DISCONNECT: |
msg = packet_get_string(NULL); |
msg = packet_get_string(NULL); |
log("Received disconnect: %.900s", msg); |
log("Received disconnect from %s: %.400s", get_remote_ipaddr(), |
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msg); |
fatal_cleanup(); |
fatal_cleanup(); |
xfree(msg); |
xfree(msg); |
break; |
break; |
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DBG(debug("received packet type %d", type)); |
DBG(debug("received packet type %d", type)); |
return type; |
return type; |
break; |
break; |
} |
} |
} |
} |
} |
} |
} |
} |
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*/ |
*/ |
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void |
void |
packet_process_incoming(const char *buf, unsigned int len) |
packet_process_incoming(const char *buf, u_int len) |
{ |
{ |
buffer_append(&input, buf, len); |
buffer_append(&input, buf, len); |
} |
} |
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/* Returns a character from the packet. */ |
/* Returns a character from the packet. */ |
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unsigned int |
u_int |
packet_get_char() |
packet_get_char() |
{ |
{ |
char ch; |
char ch; |
buffer_get(&incoming_packet, &ch, 1); |
buffer_get(&incoming_packet, &ch, 1); |
return (unsigned char) ch; |
return (u_char) ch; |
} |
} |
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/* Returns an integer from the packet data. */ |
/* Returns an integer from the packet data. */ |
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unsigned int |
u_int |
packet_get_int() |
packet_get_int() |
{ |
{ |
return buffer_get_int(&incoming_packet); |
return buffer_get_int(&incoming_packet); |
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*/ |
*/ |
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char * |
char * |
packet_get_string(unsigned int *length_ptr) |
packet_get_string(u_int *length_ptr) |
{ |
{ |
return buffer_get_string(&incoming_packet, length_ptr); |
return buffer_get_string(&incoming_packet, length_ptr); |
} |
} |
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char buf[1024]; |
char buf[1024]; |
va_list args; |
va_list args; |
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if (compat20 && (datafellows & SSH_BUG_DEBUG)) |
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return; |
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va_start(args, fmt); |
va_start(args, fmt); |
vsnprintf(buf, sizeof(buf), fmt, args); |
vsnprintf(buf, sizeof(buf), fmt, args); |
va_end(args); |
va_end(args); |
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packet_write_poll(); |
packet_write_poll(); |
while (packet_have_data_to_write()) { |
while (packet_have_data_to_write()) { |
fd_set set; |
fd_set set; |
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FD_ZERO(&set); |
FD_ZERO(&set); |
FD_SET(connection_out, &set); |
FD_SET(connection_out, &set); |
select(connection_out + 1, NULL, &set, NULL, NULL); |
while (select(connection_out + 1, NULL, &set, NULL, NULL) == -1 && |
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(errno == EAGAIN || errno == EINTR)) |
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; |
packet_write_poll(); |
packet_write_poll(); |
} |
} |
} |
} |
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/* Informs that the current session is interactive. Sets IP flags for that. */ |
/* Informs that the current session is interactive. Sets IP flags for that. */ |
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void |
void |
packet_set_interactive(int interactive, int keepalives) |
packet_set_interactive(int interactive) |
{ |
{ |
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static int called = 0; |
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int lowdelay = IPTOS_LOWDELAY; |
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int throughput = IPTOS_THROUGHPUT; |
int on = 1; |
int on = 1; |
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if (called) |
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return; |
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called = 1; |
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/* Record that we are in interactive mode. */ |
/* Record that we are in interactive mode. */ |
interactive_mode = interactive; |
interactive_mode = interactive; |
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/* Only set socket options if using a socket. */ |
/* Only set socket options if using a socket. */ |
if (!packet_connection_is_on_socket()) |
if (!packet_connection_is_on_socket()) |
return; |
return; |
if (keepalives) { |
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/* Set keepalives if requested. */ |
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if (setsockopt(connection_in, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, |
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sizeof(on)) < 0) |
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error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); |
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} |
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/* |
/* |
* IPTOS_LOWDELAY, TCP_NODELAY and IPTOS_THROUGHPUT are IPv4 only |
* IPTOS_LOWDELAY and IPTOS_THROUGHPUT are IPv4 only |
*/ |
*/ |
if (!packet_connection_is_ipv4()) |
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return; |
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if (interactive) { |
if (interactive) { |
/* |
/* |
* Set IP options for an interactive connection. Use |
* Set IP options for an interactive connection. Use |
* IPTOS_LOWDELAY and TCP_NODELAY. |
* IPTOS_LOWDELAY and TCP_NODELAY. |
*/ |
*/ |
int lowdelay = IPTOS_LOWDELAY; |
if (packet_connection_is_ipv4()) { |
if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &lowdelay, |
if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, |
sizeof(lowdelay)) < 0) |
(void *) &lowdelay, sizeof(lowdelay)) < 0) |
error("setsockopt IPTOS_LOWDELAY: %.100s", strerror(errno)); |
error("setsockopt IPTOS_LOWDELAY: %.100s", |
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strerror(errno)); |
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} |
if (setsockopt(connection_in, IPPROTO_TCP, TCP_NODELAY, (void *) &on, |
if (setsockopt(connection_in, IPPROTO_TCP, TCP_NODELAY, (void *) &on, |
sizeof(on)) < 0) |
sizeof(on)) < 0) |
error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); |
error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); |
} else { |
} else if (packet_connection_is_ipv4()) { |
/* |
/* |
* Set IP options for a non-interactive connection. Use |
* Set IP options for a non-interactive connection. Use |
* IPTOS_THROUGHPUT. |
* IPTOS_THROUGHPUT. |
*/ |
*/ |
int throughput = IPTOS_THROUGHPUT; |
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if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &throughput, |
if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &throughput, |
sizeof(throughput)) < 0) |
sizeof(throughput)) < 0) |
error("setsockopt IPTOS_THROUGHPUT: %.100s", strerror(errno)); |
error("setsockopt IPTOS_THROUGHPUT: %.100s", strerror(errno)); |