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--- a/lfd_encrypt.c 2016-10-01 23:27:51.000000000 +0200
+++ b/lfd_encrypt.c 2022-11-27 19:30:55.119047677 +0100
@@ -95,11 +95,11 @@
static char * pkey;
static char * iv_buf;
-static EVP_CIPHER_CTX ctx_enc; /* encrypt */
-static EVP_CIPHER_CTX ctx_dec; /* decrypt */
+static EVP_CIPHER_CTX *ctx_enc = NULL; /* encrypt */
+static EVP_CIPHER_CTX *ctx_dec = NULL; /* decrypt */
-static EVP_CIPHER_CTX ctx_enc_ecb; /* sideband ecb encrypt */
-static EVP_CIPHER_CTX ctx_dec_ecb; /* sideband ecb decrypt */
+static EVP_CIPHER_CTX *ctx_enc_ecb = NULL; /* sideband ecb encrypt */
+static EVP_CIPHER_CTX *ctx_dec_ecb = NULL; /* sideband ecb decrypt */
static int send_msg(int len, char *in, char **out);
static int recv_msg(int len, char *in, char **out);
@@ -146,6 +146,22 @@
free(key);
}
+static void setup_ctx_ptrs()
+{
+ if (ctx_enc_ecb == NULL) {
+ ctx_enc_ecb = EVP_CIPHER_CTX_new();
+ }
+ if (ctx_dec_ecb == NULL) {
+ ctx_dec_ecb = EVP_CIPHER_CTX_new();
+ }
+ if (ctx_enc == NULL) {
+ ctx_enc = EVP_CIPHER_CTX_new();
+ }
+ if (ctx_dec == NULL) {
+ ctx_dec = EVP_CIPHER_CTX_new();
+ }
+}
+
static int alloc_encrypt(struct vtun_host *host)
{
int sb_init = 0;
@@ -168,6 +184,8 @@
return -1;
}
+ setup_ctx_ptrs();
+
RAND_bytes((char *)&sequence_num, 4);
gibberish = 0;
gib_time_start = 0;
@@ -182,15 +200,15 @@
keysize = 32;
sb_init = 1;
cipher_type = EVP_aes_256_ecb();
- pctx_enc = &ctx_enc_ecb;
- pctx_dec = &ctx_dec_ecb;
+ pctx_enc = ctx_enc_ecb;
+ pctx_dec = ctx_dec_ecb;
break;
case VTUN_ENC_AES256ECB:
blocksize = 16;
keysize = 32;
- pctx_enc = &ctx_enc;
- pctx_dec = &ctx_dec;
+ pctx_enc = ctx_enc;
+ pctx_dec = ctx_dec;
cipher_type = EVP_aes_256_ecb();
strcpy(cipher_name,"AES-256-ECB");
break;
@@ -201,14 +219,14 @@
keysize = 16;
sb_init=1;
cipher_type = EVP_aes_128_ecb();
- pctx_enc = &ctx_enc_ecb;
- pctx_dec = &ctx_dec_ecb;
+ pctx_enc = ctx_enc_ecb;
+ pctx_dec = ctx_dec_ecb;
break;
case VTUN_ENC_AES128ECB:
blocksize = 16;
keysize = 16;
- pctx_enc = &ctx_enc;
- pctx_dec = &ctx_dec;
+ pctx_enc = ctx_enc;
+ pctx_dec = ctx_dec;
cipher_type = EVP_aes_128_ecb();
strcpy(cipher_name,"AES-128-ECB");
break;
@@ -221,16 +239,16 @@
var_key = 1;
sb_init = 1;
cipher_type = EVP_bf_ecb();
- pctx_enc = &ctx_enc_ecb;
- pctx_dec = &ctx_dec_ecb;
+ pctx_enc = ctx_enc_ecb;
+ pctx_dec = ctx_dec_ecb;
break;
case VTUN_ENC_BF256ECB:
blocksize = 8;
keysize = 32;
var_key = 1;
- pctx_enc = &ctx_enc;
- pctx_dec = &ctx_dec;
+ pctx_enc = ctx_enc;
+ pctx_dec = ctx_dec;
cipher_type = EVP_bf_ecb();
strcpy(cipher_name,"Blowfish-256-ECB");
break;
@@ -243,16 +261,16 @@
var_key = 1;
sb_init = 1;
cipher_type = EVP_bf_ecb();
- pctx_enc = &ctx_enc_ecb;
- pctx_dec = &ctx_dec_ecb;
+ pctx_enc = ctx_enc_ecb;
+ pctx_dec = ctx_dec_ecb;
break;
case VTUN_ENC_BF128ECB: /* blowfish 128 ecb is the default */
default:
blocksize = 8;
keysize = 16;
var_key = 1;
- pctx_enc = &ctx_enc;
- pctx_dec = &ctx_dec;
+ pctx_enc = ctx_enc;
+ pctx_dec = ctx_dec;
cipher_type = EVP_bf_ecb();
strcpy(cipher_name,"Blowfish-128-ECB");
break;
@@ -294,10 +312,10 @@
lfd_free(enc_buf); enc_buf = NULL;
lfd_free(dec_buf); dec_buf = NULL;
- EVP_CIPHER_CTX_cleanup(&ctx_enc);
- EVP_CIPHER_CTX_cleanup(&ctx_dec);
- EVP_CIPHER_CTX_cleanup(&ctx_enc_ecb);
- EVP_CIPHER_CTX_cleanup(&ctx_dec_ecb);
+ EVP_CIPHER_CTX_cleanup(ctx_enc);
+ EVP_CIPHER_CTX_cleanup(ctx_dec);
+ EVP_CIPHER_CTX_cleanup(ctx_enc_ecb);
+ EVP_CIPHER_CTX_cleanup(ctx_dec_ecb);
return 0;
}
@@ -323,7 +341,7 @@
outlen=len+pad;
if (pad == blocksize)
RAND_bytes(in_ptr+len, blocksize-1);
- EVP_EncryptUpdate(&ctx_enc, out_ptr, &outlen, in_ptr, len+pad);
+ EVP_EncryptUpdate(ctx_enc, out_ptr, &outlen, in_ptr, len+pad);
*out = enc_buf;
sequence_num++;
@@ -343,7 +361,7 @@
outlen=len;
if (!len) return 0;
- EVP_DecryptUpdate(&ctx_dec, out_ptr, &outlen, in_ptr, len);
+ EVP_DecryptUpdate(ctx_dec, out_ptr, &outlen, in_ptr, len);
recv_ib_mesg(&outlen, &out_ptr);
if (!outlen) return 0;
tmp_ptr = out_ptr + outlen; tmp_ptr--;
@@ -431,13 +449,15 @@
break;
} /* switch(cipher) */
- EVP_CIPHER_CTX_init(&ctx_enc);
- EVP_EncryptInit_ex(&ctx_enc, cipher_type, NULL, NULL, NULL);
+ setup_ctx_ptrs();
+
+ EVP_CIPHER_CTX_init(ctx_enc);
+ EVP_EncryptInit_ex(ctx_enc, cipher_type, NULL, NULL, NULL);
if (var_key)
- EVP_CIPHER_CTX_set_key_length(&ctx_enc, keysize);
- EVP_EncryptInit_ex(&ctx_enc, NULL, NULL, pkey, NULL);
- EVP_EncryptInit_ex(&ctx_enc, NULL, NULL, NULL, iv);
- EVP_CIPHER_CTX_set_padding(&ctx_enc, 0);
+ EVP_CIPHER_CTX_set_key_length(ctx_enc, keysize);
+ EVP_EncryptInit_ex(ctx_enc, NULL, NULL, pkey, NULL);
+ EVP_EncryptInit_ex(ctx_enc, NULL, NULL, NULL, iv);
+ EVP_CIPHER_CTX_set_padding(ctx_enc, 0);
if (enc_init_first_time)
{
sprintf(tmpstr,"%s encryption initialized", cipher_name);
@@ -521,13 +541,15 @@
break;
} /* switch(cipher) */
- EVP_CIPHER_CTX_init(&ctx_dec);
- EVP_DecryptInit_ex(&ctx_dec, cipher_type, NULL, NULL, NULL);
+ setup_ctx_ptrs();
+
+ EVP_CIPHER_CTX_init(ctx_dec);
+ EVP_DecryptInit_ex(ctx_dec, cipher_type, NULL, NULL, NULL);
if (var_key)
- EVP_CIPHER_CTX_set_key_length(&ctx_dec, keysize);
- EVP_DecryptInit_ex(&ctx_dec, NULL, NULL, pkey, NULL);
- EVP_DecryptInit_ex(&ctx_dec, NULL, NULL, NULL, iv);
- EVP_CIPHER_CTX_set_padding(&ctx_dec, 0);
+ EVP_CIPHER_CTX_set_key_length(ctx_dec, keysize);
+ EVP_DecryptInit_ex(ctx_dec, NULL, NULL, pkey, NULL);
+ EVP_DecryptInit_ex(ctx_dec, NULL, NULL, NULL, iv);
+ EVP_CIPHER_CTX_set_padding(ctx_dec, 0);
if (dec_init_first_time)
{
sprintf(tmpstr,"%s decryption initialized", cipher_name);
@@ -559,7 +581,7 @@
in_ptr = in - blocksize*2;
outlen = blocksize*2;
- EVP_EncryptUpdate(&ctx_enc_ecb, in_ptr,
+ EVP_EncryptUpdate(ctx_enc_ecb, in_ptr,
&outlen, in_ptr, blocksize*2);
*out = in_ptr;
len = outlen;
@@ -586,7 +608,7 @@
in_ptr = in;
iv = malloc(blocksize);
outlen = blocksize*2;
- EVP_DecryptUpdate(&ctx_dec_ecb, in_ptr, &outlen, in_ptr, blocksize*2);
+ EVP_DecryptUpdate(ctx_dec_ecb, in_ptr, &outlen, in_ptr, blocksize*2);
if ( !strncmp(in_ptr, "ivec", 4) )
{
@@ -629,7 +651,7 @@
if (cipher_enc_state != CIPHER_INIT)
{
cipher_enc_state = CIPHER_INIT;
- EVP_CIPHER_CTX_cleanup(&ctx_enc);
+ EVP_CIPHER_CTX_cleanup(ctx_enc);
#ifdef LFD_ENCRYPT_DEBUG
vtun_syslog(LOG_INFO,
"Forcing local encryptor re-init");
@@ -710,7 +732,7 @@
if (cipher_enc_state != CIPHER_INIT)
{
cipher_enc_state = CIPHER_INIT;
- EVP_CIPHER_CTX_cleanup(&ctx_enc);
+ EVP_CIPHER_CTX_cleanup(ctx_enc);
}
#ifdef LFD_ENCRYPT_DEBUG
vtun_syslog(LOG_INFO, "Remote requests encryptor re-init");
@@ -724,7 +746,7 @@
cipher_enc_state != CIPHER_REQ_INIT &&
cipher_enc_state != CIPHER_INIT)
{
- EVP_CIPHER_CTX_cleanup (&ctx_dec);
+ EVP_CIPHER_CTX_cleanup (ctx_dec);
cipher_dec_state = CIPHER_INIT;
cipher_enc_state = CIPHER_REQ_INIT;
}
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