diff options
Diffstat (limited to 'usr.bin/ssh/packet.c')
| -rw-r--r-- | usr.bin/ssh/packet.c | 64 |
1 files changed, 29 insertions, 35 deletions
diff --git a/usr.bin/ssh/packet.c b/usr.bin/ssh/packet.c index f7d3c12c15d..b5d692cf842 100644 --- a/usr.bin/ssh/packet.c +++ b/usr.bin/ssh/packet.c @@ -37,7 +37,7 @@ */ #include "includes.h" -RCSID("$OpenBSD: packet.c,v 1.36 2000/10/03 17:59:57 markus Exp $"); +RCSID("$OpenBSD: packet.c,v 1.37 2000/10/11 20:27:23 markus Exp $"); #include "xmalloc.h" #include "buffer.h" @@ -45,7 +45,6 @@ RCSID("$OpenBSD: packet.c,v 1.36 2000/10/03 17:59:57 markus Exp $"); #include "bufaux.h" #include "ssh.h" #include "crc32.h" -#include "cipher.h" #include "getput.h" #include "compress.h" @@ -59,6 +58,7 @@ RCSID("$OpenBSD: packet.c,v 1.36 2000/10/03 17:59:57 markus Exp $"); #include <openssl/dh.h> #include <openssl/hmac.h> #include "buffer.h" +#include "cipher.h" #include "kex.h" #include "hmac.h" @@ -161,11 +161,14 @@ packet_set_ssh2_format(void) void 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_type = SSH_CIPHER_NONE; - cipher_set_key(&send_context, SSH_CIPHER_NONE, (unsigned char *) "", 0); - cipher_set_key(&receive_context, SSH_CIPHER_NONE, (unsigned char *) "", 0); + cipher_init(&send_context, none, (unsigned char *) "", 0, NULL, 0); + cipher_init(&receive_context, none, (unsigned char *) "", 0, NULL, 0); if (!initialized) { initialized = 1; buffer_init(&input); @@ -326,28 +329,18 @@ packet_encrypt(CipherContext * cc, void *dest, void *src, */ void -packet_decrypt(CipherContext * cc, void *dest, void *src, - unsigned int bytes) +packet_decrypt(CipherContext *context, void *dest, void *src, unsigned int bytes) { - int i; - - if ((bytes % 8) != 0) - fatal("packet_decrypt: bad ciphertext length %d", bytes); - /* * Cryptographic attack detector for ssh - Modifications for packet.c * (C)1998 CORE-SDI, Buenos Aires Argentina Ariel Futoransky(futo@core-sdi.com) */ - - if (cc->type == SSH_CIPHER_NONE || compat20) { - i = DEATTACK_OK; - } else { - i = detect_attack(src, bytes, NULL); - } - if (i == DEATTACK_DETECTED) + if (!compat20 && + context->cipher->number != SSH_CIPHER_NONE && + detect_attack(src, bytes, NULL) == DEATTACK_DETECTED) packet_disconnect("crc32 compensation attack: network attack detected"); - cipher_decrypt(cc, dest, src, bytes); + cipher_decrypt(context, dest, src, bytes); } /* @@ -358,14 +351,15 @@ packet_decrypt(CipherContext * cc, void *dest, void *src, void packet_set_encryption_key(const unsigned char *key, unsigned int keylen, - int cipher) + 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("keylen too small: %d", keylen); - - /* All other ciphers use the same key in both directions for now. */ - cipher_set_key(&receive_context, cipher, key, keylen); - cipher_set_key(&send_context, cipher, key, keylen); + 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); } /* Starts constructing a packet to send. */ @@ -553,7 +547,7 @@ packet_send2() mac = &kex->mac[MODE_OUT]; comp = &kex->comp[MODE_OUT]; } - block_size = enc ? enc->block_size : 8; + block_size = enc ? enc->cipher->block_size : 8; cp = buffer_ptr(&outgoing_packet); type = cp[5] & 0xff; @@ -637,10 +631,10 @@ packet_send2() fatal("packet_send2: no KEX"); if (mac->md != NULL) mac->enabled = 1; - DBG(debug("cipher_set_key_iv send_context")); - cipher_set_key_iv(&send_context, enc->type, - enc->key, enc->key_len, - enc->iv, enc->iv_len); + DBG(debug("cipher_init send_context")); + cipher_init(&send_context, enc->cipher, + enc->key, enc->cipher->key_len, + enc->iv, enc->cipher->block_size); clear_enc_keys(enc, kex->we_need); if (comp->type != 0 && comp->enabled == 0) { comp->enabled = 1; @@ -841,7 +835,7 @@ packet_read_poll2(int *payload_len_ptr) comp = &kex->comp[MODE_IN]; } maclen = mac && mac->enabled ? mac->mac_len : 0; - block_size = enc ? enc->block_size : 8; + block_size = enc ? enc->cipher->block_size : 8; if (packet_length == 0) { /* @@ -939,10 +933,10 @@ packet_read_poll2(int *payload_len_ptr) fatal("packet_read_poll2: no KEX"); if (mac->md != NULL) mac->enabled = 1; - DBG(debug("cipher_set_key_iv receive_context")); - cipher_set_key_iv(&receive_context, enc->type, - enc->key, enc->key_len, - enc->iv, enc->iv_len); + DBG(debug("cipher_init receive_context")); + cipher_init(&receive_context, enc->cipher, + enc->key, enc->cipher->key_len, + enc->iv, enc->cipher->block_size); clear_enc_keys(enc, kex->we_need); if (comp->type != 0 && comp->enabled == 0) { comp->enabled = 1; |