version 1.24, 2000/04/03 07:07:15 |
version 1.25, 2000/04/03 20:12:55 |
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* |
* |
* This file contains code implementing the packet protocol and communication |
* This file contains code implementing the packet protocol and communication |
* with the other side. This same code is used both on client and server side. |
* with the other side. This same code is used both on client and server side. |
* |
* |
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* SSH2 packet format added by Markus Friedl. |
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* |
*/ |
*/ |
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#include "includes.h" |
#include "includes.h" |
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#include "deattack.h" |
#include "deattack.h" |
#include "channels.h" |
#include "channels.h" |
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#include "compat.h" |
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#include "ssh2.h" |
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#include <ssl/bn.h> |
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#include <ssl/dh.h> |
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#include <ssl/hmac.h> |
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#include "buffer.h" |
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#include "kex.h" |
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#include "hmac.h" |
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#ifdef PACKET_DEBUG |
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#define DBG(x) x |
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#else |
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#define DBG(x) |
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#endif |
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/* |
/* |
* This variable contains the file descriptors used for communicating with |
* This variable contains the file descriptors used for communicating with |
* the other side. connection_in is used for reading; connection_out for |
* the other side. connection_in is used for reading; connection_out for |
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/* Set to true if the connection is interactive. */ |
/* Set to true if the connection is interactive. */ |
static int interactive_mode = 0; |
static int interactive_mode = 0; |
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/* True if SSH2 packet format is used */ |
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int use_ssh2_packet_format = 0; |
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/* Session key information for Encryption and MAC */ |
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Kex *kex = NULL; |
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void |
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packet_set_kex(Kex *k) |
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{ |
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if( k->mac[MODE_IN ].key == NULL || |
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k->enc[MODE_IN ].key == NULL || |
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k->enc[MODE_IN ].iv == NULL || |
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k->mac[MODE_OUT].key == NULL || |
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k->enc[MODE_OUT].key == NULL || |
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k->enc[MODE_OUT].iv == NULL) |
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fatal("bad KEX"); |
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kex = k; |
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} |
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void |
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clear_enc_keys(Enc *enc, int len) |
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{ |
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memset(enc->iv, 0, len); |
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memset(enc->key, 0, len); |
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xfree(enc->iv); |
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xfree(enc->key); |
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enc->iv = NULL; |
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enc->key = NULL; |
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} |
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void |
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packet_set_ssh2_format(void) |
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{ |
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debug("use_ssh2_packet_format"); |
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use_ssh2_packet_format = 1; |
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} |
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/* |
/* |
* Sets the descriptors used for communication. Disables encryption until |
* Sets the descriptors used for communication. Disables encryption until |
* packet_set_encryption_key is called. |
* packet_set_encryption_key is called. |
*/ |
*/ |
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void |
void |
packet_set_connection(int fd_in, int fd_out) |
packet_set_connection(int fd_in, int fd_out) |
{ |
{ |
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* Level is compression level 1 (fastest) - 9 (slow, best) as in gzip. |
* Level is compression level 1 (fastest) - 9 (slow, best) as in gzip. |
*/ |
*/ |
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/*** XXXXX todo: kex means re-init */ |
void |
void |
packet_start_compression(int level) |
packet_start_compression(int level) |
{ |
{ |
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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) |
unsigned int bytes) |
{ |
{ |
cipher_encrypt(cc, dest, src, bytes); |
cipher_encrypt(cc, dest, src, bytes); |
} |
} |
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void |
void |
packet_decrypt(CipherContext * cc, void *dest, void *src, |
packet_decrypt(CipherContext * cc, void *dest, void *src, |
unsigned int bytes) |
unsigned int bytes) |
{ |
{ |
int i; |
int i; |
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* (C)1998 CORE-SDI, Buenos Aires Argentina Ariel Futoransky(futo@core-sdi.com) |
* (C)1998 CORE-SDI, Buenos Aires Argentina Ariel Futoransky(futo@core-sdi.com) |
*/ |
*/ |
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switch (cc->type) { |
if (cc->type == SSH_CIPHER_NONE || compat20) { |
case SSH_CIPHER_NONE: |
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i = DEATTACK_OK; |
i = DEATTACK_OK; |
break; |
} else { |
default: |
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i = detect_attack(src, bytes, NULL); |
i = detect_attack(src, bytes, NULL); |
break; |
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} |
} |
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if (i == DEATTACK_DETECTED) |
if (i == DEATTACK_DETECTED) |
packet_disconnect("crc32 compensation attack: network attack detected"); |
packet_disconnect("crc32 compensation attack: network attack detected"); |
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void |
void |
packet_set_encryption_key(const unsigned char *key, unsigned int keylen, |
packet_set_encryption_key(const unsigned char *key, unsigned int keylen, |
int cipher) |
int cipher) |
{ |
{ |
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if (keylen < 20) |
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fatal("keylen too small: %d", keylen); |
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/* All other ciphers use the same key in both directions for now. */ |
/* All other ciphers use the same key in both directions for now. */ |
cipher_set_key(&receive_context, cipher, key, keylen, 0); |
cipher_set_key(&receive_context, cipher, key, keylen, 0); |
cipher_set_key(&send_context, cipher, key, keylen, 1); |
cipher_set_key(&send_context, cipher, key, keylen, 1); |
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/* Starts constructing a packet to send. */ |
/* Starts constructing a packet to send. */ |
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void |
void |
packet_start(int type) |
packet_start1(int type) |
{ |
{ |
char buf[9]; |
char buf[9]; |
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buffer_append(&outgoing_packet, buf, 9); |
buffer_append(&outgoing_packet, buf, 9); |
} |
} |
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void |
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packet_start2(int type) |
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{ |
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char buf[4+1+1]; |
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buffer_clear(&outgoing_packet); |
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memset(buf, 0, sizeof buf); |
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/* buf[0..3] = payload_len; */ |
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/* buf[4] = pad_len; */ |
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buf[5] = type & 0xff; |
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buffer_append(&outgoing_packet, buf, sizeof buf); |
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} |
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void |
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packet_start(int type) |
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{ |
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DBG(debug("packet_start[%d]",type)); |
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if (use_ssh2_packet_format) |
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packet_start2(type); |
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else |
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packet_start1(type); |
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} |
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/* Appends a character to the packet data. */ |
/* Appends a character to the packet data. */ |
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void |
void |
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*/ |
*/ |
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void |
void |
packet_send() |
packet_send1() |
{ |
{ |
char buf[8], *cp; |
char buf[8], *cp; |
int i, padding, len; |
int i, padding, len; |
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} |
} |
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/* |
/* |
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* Finalize packet in SSH2 format (compress, mac, encrypt, enqueue) |
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*/ |
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void |
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packet_send2() |
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{ |
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unsigned char *macbuf = NULL; |
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char *cp; |
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unsigned int packet_length = 0; |
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unsigned int i, padlen, len; |
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u_int32_t rand = 0; |
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static unsigned int seqnr = 0; |
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int type; |
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Enc *enc = NULL; |
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Mac *mac = NULL; |
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Comp *comp = NULL; |
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int block_size; |
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if (kex != NULL) { |
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enc = &kex->enc[MODE_OUT]; |
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mac = &kex->mac[MODE_OUT]; |
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comp = &kex->comp[MODE_OUT]; |
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} |
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block_size = enc ? enc->block_size : 8; |
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cp = buffer_ptr(&outgoing_packet); |
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type = cp[5] & 0xff; |
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#ifdef PACKET_DEBUG |
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fprintf(stderr, "plain: "); |
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buffer_dump(&outgoing_packet); |
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#endif |
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if (comp && comp->enabled) { |
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len = buffer_len(&outgoing_packet); |
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/* skip header, compress only payload */ |
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buffer_consume(&outgoing_packet, 5); |
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buffer_clear(&compression_buffer); |
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buffer_compress(&outgoing_packet, &compression_buffer); |
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buffer_clear(&outgoing_packet); |
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buffer_append(&outgoing_packet, "\0\0\0\0\0", 5); |
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buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer), |
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buffer_len(&compression_buffer)); |
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DBG(debug("compression: raw %d compressed %d", len, |
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buffer_len(&outgoing_packet))); |
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} |
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/* sizeof (packet_len + pad_len + payload) */ |
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len = buffer_len(&outgoing_packet); |
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/* |
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* calc size of padding, alloc space, get random data, |
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* minimum padding is 4 bytes |
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*/ |
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padlen = block_size - (len % block_size); |
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if (padlen < 4) |
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padlen += block_size; |
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buffer_append_space(&outgoing_packet, &cp, padlen); |
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if (enc && enc->type != SSH_CIPHER_NONE) { |
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for (i = 0; i < padlen; i++) { |
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if (i % 4 == 0) |
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rand = arc4random(); |
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cp[i] = rand & 0xff; |
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rand <<= 8; |
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} |
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} |
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/* packet_length includes payload, padding and padding length field */ |
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packet_length = buffer_len(&outgoing_packet) - 4; |
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cp = buffer_ptr(&outgoing_packet); |
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PUT_32BIT(cp, packet_length); |
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cp[4] = padlen & 0xff; |
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DBG(debug("send: len %d (includes padlen %d)", packet_length+4, padlen)); |
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/* compute MAC over seqnr and packet(length fields, payload, padding) */ |
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if (mac && mac->enabled) { |
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macbuf = hmac( mac->md, seqnr, |
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(unsigned char *) buffer_ptr(&outgoing_packet), |
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buffer_len(&outgoing_packet), |
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mac->key, mac->key_len |
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); |
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DBG(debug("done calc HMAC out #%d", seqnr)); |
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} |
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/* encrypt packet and append to output buffer. */ |
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buffer_append_space(&output, &cp, buffer_len(&outgoing_packet)); |
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packet_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet), |
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buffer_len(&outgoing_packet)); |
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/* append unencrypted MAC */ |
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if (mac && mac->enabled) |
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buffer_append(&output, (char *)macbuf, mac->mac_len); |
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#ifdef PACKET_DEBUG |
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fprintf(stderr, "encrypted: "); |
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buffer_dump(&output); |
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#endif |
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/* increment sequence number for outgoing packets */ |
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if (++seqnr == 0) |
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log("outgoing seqnr wraps around"); |
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buffer_clear(&outgoing_packet); |
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if (type == SSH2_MSG_NEWKEYS) { |
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if (kex==NULL || mac==NULL || enc==NULL || comp==NULL) |
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fatal("packet_send2: no KEX"); |
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if (mac->md != NULL) |
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mac->enabled = 1; |
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debug("cipher_set_key_iv send_context"); |
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cipher_set_key_iv(&send_context, enc->type, |
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enc->key, enc->key_len, |
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enc->iv, enc->iv_len); |
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clear_enc_keys(enc, kex->we_need); |
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if (comp->type != 0 && comp->enabled == 0) { |
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comp->enabled = 1; |
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if (! packet_compression) |
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packet_start_compression(6); |
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} |
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} |
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} |
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void |
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packet_send() |
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{ |
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if (use_ssh2_packet_format) |
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packet_send2(); |
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else |
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packet_send1(); |
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DBG(debug("packet_send done")); |
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} |
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void |
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packet_send_and_wait() |
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{ |
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packet_send(); |
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packet_write_wait(); |
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} |
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/* |
* Waits until a packet has been received, and returns its type. Note that |
* Waits until a packet has been received, and returns its type. Note that |
* no other data is processed until this returns, so this function should not |
* no other data is processed until this returns, so this function should not |
* be used during the interactive session. |
* be used during the interactive session. |
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int type, len; |
int type, len; |
fd_set set; |
fd_set set; |
char buf[8192]; |
char buf[8192]; |
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DBG(debug("packet_read()")); |
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/* Since we are blocking, ensure that all written packets have been sent. */ |
/* Since we are blocking, ensure that all written packets have been sent. */ |
packet_write_wait(); |
packet_write_wait(); |
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type = packet_read(payload_len_ptr); |
type = packet_read(payload_len_ptr); |
if (type != expected_type) |
if (type != expected_type) |
packet_disconnect("Protocol error: expected packet type %d, got %d", |
packet_disconnect("Protocol error: expected packet type %d, got %d", |
expected_type, type); |
expected_type, type); |
} |
} |
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/* Checks if a full packet is available in the data received so far via |
/* Checks if a full packet is available in the data received so far via |
|
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*/ |
*/ |
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int |
int |
packet_read_poll(int *payload_len_ptr) |
packet_read_poll1(int *payload_len_ptr) |
{ |
{ |
unsigned int len, padded_len; |
unsigned int len, padded_len; |
unsigned char *ucp; |
unsigned char *ucp; |
char buf[8], *cp, *msg; |
char buf[8], *cp; |
unsigned int checksum, stored_checksum; |
unsigned int checksum, stored_checksum; |
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restart: |
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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; |
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/* Compute packet checksum. */ |
/* Compute packet checksum. */ |
checksum = crc32((unsigned char *) buffer_ptr(&incoming_packet), |
checksum = crc32((unsigned char *) buffer_ptr(&incoming_packet), |
buffer_len(&incoming_packet) - 4); |
buffer_len(&incoming_packet) - 4); |
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/* Skip padding. */ |
/* Skip padding. */ |
buffer_consume(&incoming_packet, 8 - len % 8); |
buffer_consume(&incoming_packet, 8 - len % 8); |
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if (len != buffer_len(&incoming_packet)) |
if (len != buffer_len(&incoming_packet)) |
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 = (unsigned char *) buffer_ptr(&incoming_packet) + len - 4; |
stored_checksum = GET_32BIT(ucp); |
stored_checksum = GET_32BIT(ucp); |
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buffer_uncompress(&incoming_packet, &compression_buffer); |
buffer_uncompress(&incoming_packet, &compression_buffer); |
buffer_clear(&incoming_packet); |
buffer_clear(&incoming_packet); |
buffer_append(&incoming_packet, buffer_ptr(&compression_buffer), |
buffer_append(&incoming_packet, buffer_ptr(&compression_buffer), |
buffer_len(&compression_buffer)); |
buffer_len(&compression_buffer)); |
} |
} |
/* Get packet type. */ |
/* Get packet type. */ |
buffer_get(&incoming_packet, &buf[0], 1); |
buffer_get(&incoming_packet, &buf[0], 1); |
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/* Return length of payload (without type field). */ |
/* Return length of payload (without type field). */ |
*payload_len_ptr = buffer_len(&incoming_packet); |
*payload_len_ptr = buffer_len(&incoming_packet); |
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/* Handle disconnect message. */ |
/* Return type. */ |
if ((unsigned char) buf[0] == SSH_MSG_DISCONNECT) { |
return (unsigned char) buf[0]; |
msg = packet_get_string(NULL); |
} |
log("Received disconnect: %.900s", msg); |
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xfree(msg); |
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fatal_cleanup(); |
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} |
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/* Ignore ignore messages. */ |
int |
if ((unsigned char) buf[0] == SSH_MSG_IGNORE) |
packet_read_poll2(int *payload_len_ptr) |
goto restart; |
{ |
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unsigned int padlen, need; |
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unsigned char buf[8], *macbuf; |
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unsigned char *ucp; |
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char *cp; |
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static unsigned int packet_length = 0; |
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static unsigned int seqnr = 0; |
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int type; |
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int maclen, block_size; |
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Enc *enc = NULL; |
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Mac *mac = NULL; |
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Comp *comp = NULL; |
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/* Send debug messages as debugging output. */ |
if (kex != NULL) { |
if ((unsigned char) buf[0] == SSH_MSG_DEBUG) { |
enc = &kex->enc[MODE_IN]; |
msg = packet_get_string(NULL); |
mac = &kex->mac[MODE_IN]; |
debug("Remote: %.900s", msg); |
comp = &kex->comp[MODE_IN]; |
xfree(msg); |
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goto restart; |
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} |
} |
/* Return type. */ |
maclen = mac && mac->enabled ? mac->mac_len : 0; |
return (unsigned char) buf[0]; |
block_size = enc ? enc->block_size : 8; |
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if (packet_length == 0) { |
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/* |
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* check if input size is less than the cipher block size, |
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* decrypt first block and extract length of incoming packet |
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*/ |
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if (buffer_len(&input) < block_size) |
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return SSH_MSG_NONE; |
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buffer_clear(&incoming_packet); |
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buffer_append_space(&incoming_packet, &cp, block_size); |
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packet_decrypt(&receive_context, cp, buffer_ptr(&input), |
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block_size); |
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ucp = (unsigned char *) buffer_ptr(&incoming_packet); |
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packet_length = GET_32BIT(ucp); |
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if (packet_length < 1 + 4 || packet_length > 256 * 1024) { |
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buffer_dump(&incoming_packet); |
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packet_disconnect("Bad packet length %d.", packet_length); |
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} |
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DBG(debug("input: packet len %d", packet_length+4)); |
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buffer_consume(&input, block_size); |
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} |
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/* we have a partial packet of block_size bytes */ |
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need = 4 + packet_length - block_size; |
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DBG(debug("partial packet %d, need %d, maclen %d", block_size, |
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need, maclen)); |
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if (need % block_size != 0) |
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fatal("padding error: need %d block %d mod %d", |
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need, block_size, need % block_size); |
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/* |
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* check if the entire packet has been received and |
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* decrypt into incoming_packet |
|
*/ |
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if (buffer_len(&input) < need + maclen) |
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return SSH_MSG_NONE; |
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#ifdef PACKET_DEBUG |
|
fprintf(stderr, "read_poll enc/full: "); |
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buffer_dump(&input); |
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#endif |
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buffer_append_space(&incoming_packet, &cp, need); |
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packet_decrypt(&receive_context, cp, buffer_ptr(&input), need); |
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buffer_consume(&input, need); |
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/* |
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* compute MAC over seqnr and packet, |
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* increment sequence number for incoming packet |
|
*/ |
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if (mac && mac->enabled) { |
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macbuf = hmac( mac->md, seqnr, |
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(unsigned char *) buffer_ptr(&incoming_packet), |
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buffer_len(&incoming_packet), |
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mac->key, mac->key_len |
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); |
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if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0) |
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packet_disconnect("Corrupted HMAC on input."); |
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DBG(debug("HMAC #%d ok", seqnr)); |
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buffer_consume(&input, mac->mac_len); |
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} |
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if (++seqnr == 0) |
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log("incoming seqnr wraps around"); |
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|
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/* get padlen */ |
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cp = buffer_ptr(&incoming_packet) + 4; |
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padlen = *cp & 0xff; |
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DBG(debug("input: padlen %d", padlen)); |
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if (padlen < 4) |
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packet_disconnect("Corrupted padlen %d on input.", padlen); |
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|
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/* skip packet size + padlen, discard padding */ |
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buffer_consume(&incoming_packet, 4 + 1); |
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buffer_consume_end(&incoming_packet, padlen); |
|
|
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DBG(debug("input: len before de-compress %d", buffer_len(&incoming_packet))); |
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if (comp && comp->enabled) { |
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buffer_clear(&compression_buffer); |
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buffer_uncompress(&incoming_packet, &compression_buffer); |
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buffer_clear(&incoming_packet); |
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buffer_append(&incoming_packet, buffer_ptr(&compression_buffer), |
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buffer_len(&compression_buffer)); |
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DBG(debug("input: len after de-compress %d", buffer_len(&incoming_packet))); |
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} |
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/* |
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* get packet type, implies consume. |
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* return length of payload (without type field) |
|
*/ |
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buffer_get(&incoming_packet, (char *)&buf[0], 1); |
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*payload_len_ptr = buffer_len(&incoming_packet); |
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|
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/* reset for next packet */ |
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packet_length = 0; |
|
|
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/* extract packet type */ |
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type = (unsigned char)buf[0]; |
|
|
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if (type == SSH2_MSG_NEWKEYS) { |
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if (kex==NULL || mac==NULL || enc==NULL || comp==NULL) |
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fatal("packet_read_poll2: no KEX"); |
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if (mac->md != NULL) |
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mac->enabled = 1; |
|
debug("cipher_set_key_iv receive_context"); |
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cipher_set_key_iv(&receive_context, enc->type, |
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enc->key, enc->key_len, |
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enc->iv, enc->iv_len); |
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clear_enc_keys(enc, kex->we_need); |
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if (comp->type != 0 && comp->enabled == 0) { |
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comp->enabled = 1; |
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if (! packet_compression) |
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packet_start_compression(6); |
|
} |
|
} |
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|
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#ifdef PACKET_DEBUG |
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fprintf(stderr, "read/plain[%d]:\r\n",type); |
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buffer_dump(&incoming_packet); |
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#endif |
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return (unsigned char)type; |
} |
} |
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int |
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packet_read_poll(int *payload_len_ptr) |
|
{ |
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char *msg; |
|
for (;;) { |
|
int type = use_ssh2_packet_format ? |
|
packet_read_poll2(payload_len_ptr): |
|
packet_read_poll1(payload_len_ptr); |
|
|
|
if(compat20) { |
|
int reason; |
|
if (type != 0) |
|
DBG(debug("received packet type %d", type)); |
|
switch(type) { |
|
case SSH2_MSG_IGNORE: |
|
break; |
|
case SSH2_MSG_DEBUG: |
|
packet_get_char(); |
|
msg = packet_get_string(NULL); |
|
debug("Remote: %.900s", msg); |
|
xfree(msg); |
|
msg = packet_get_string(NULL); |
|
xfree(msg); |
|
break; |
|
case SSH2_MSG_DISCONNECT: |
|
reason = packet_get_int(); |
|
msg = packet_get_string(NULL); |
|
log("Received disconnect: %d: %.900s", reason, msg); |
|
xfree(msg); |
|
fatal_cleanup(); |
|
break; |
|
default: |
|
return type; |
|
break; |
|
} |
|
} else { |
|
switch(type) { |
|
case SSH_MSG_IGNORE: |
|
break; |
|
case SSH_MSG_DEBUG: |
|
msg = packet_get_string(NULL); |
|
debug("Remote: %.900s", msg); |
|
xfree(msg); |
|
break; |
|
case SSH_MSG_DISCONNECT: |
|
msg = packet_get_string(NULL); |
|
log("Received disconnect: %.900s", msg); |
|
fatal_cleanup(); |
|
xfree(msg); |
|
break; |
|
default: |
|
if (type != 0) |
|
DBG(debug("received packet type %d", type)); |
|
return type; |
|
break; |
|
} |
|
} |
|
} |
|
} |
|
|
/* |
/* |
* Buffers the given amount of input characters. This is intended to be used |
* Buffers the given amount of input characters. This is intended to be used |
* together with packet_read_poll. |
* together with packet_read_poll. |
|
|
va_end(args); |
va_end(args); |
|
|
/* Send the disconnect message to the other side, and wait for it to get sent. */ |
/* Send the disconnect message to the other side, and wait for it to get sent. */ |
packet_start(SSH_MSG_DISCONNECT); |
if (compat20) { |
packet_put_string(buf, strlen(buf)); |
packet_start(SSH2_MSG_DISCONNECT); |
|
packet_put_int(SSH2_DISCONNECT_PROTOCOL_ERROR); |
|
packet_put_cstring(buf); |
|
packet_put_cstring(""); |
|
} else { |
|
packet_start(SSH_MSG_DISCONNECT); |
|
packet_put_string(buf, strlen(buf)); |
|
} |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
|
|
|
|
{ |
{ |
static int called = 0; |
static int called = 0; |
if (called) { |
if (called) { |
log("packet_set_maxsize: called twice: old %d new %d", max_packet_size, s); |
log("packet_set_maxsize: called twice: old %d new %d", |
|
max_packet_size, s); |
return -1; |
return -1; |
} |
} |
if (s < 4 * 1024 || s > 1024 * 1024) { |
if (s < 4 * 1024 || s > 1024 * 1024) { |