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uencrypt: support all available ciphers

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Modify uencrypt to support any cipher provided by ssl library.

Original tool supported only AES-128-CBC to decrypt the config
mtd of Arcadyan WG430223/WG443223.

TP-Link Deco S4 has mtd configuration encrypted with DES-ECB,
so make the cipher generic to support both routers.

Signed-off-by: Nick French <nickfrench@gmail.com>
Reviewed-by: Eneas U de Queiroz >cotequeiroz@gmail.com>
This commit is contained in:
Nick French 2022-08-13 10:23:58 -05:00 committed by Christian Marangi
parent a6b0d08060
commit 764600648f
No known key found for this signature in database
GPG Key ID: AC001D09ADBFEAD7
2 changed files with 52 additions and 18 deletions
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15
package/utils/uencrypt/Makefile
View File

@ -22,16 +22,17 @@ CMAKE_OPTIONS+=$(if $(CONFIG_UENCRYPT_WOLFSSL),-DUSE_WOLFSSL=1)
define Package/uencrypt
SECTION:=utils
CATEGORY:=Base system
TITLE:=Decryption utility for Arcadyan WG4xx223
DEPENDS:=@TARGET_ramips_mt7621 +UENCRYPT_WOLFSSL:libwolfssl +UENCRYPT_OPENSSL:libopenssl
TITLE:=Decryption utility for Arcadyan WG4xx223 and TP-Link Deco S4
DEPENDS:=+UENCRYPT_WOLFSSL:libwolfssl +UENCRYPT_OPENSSL:libopenssl
endef
define Package/uencrypt/description
This is a small AES-128-CBC encrypton/decryption program.
Even though it can be used for regular encryption and
decryption operations using AES-128-CBC, it is included
here to unencrypt the configuration from mtd on Arcadyan
WG430223 and WG443223 routers.
This is a small encrypton/decryption program. It defaults
to AES-128-CBC, but supports any encryption provided by
the available openssl/wolfssl library. Even though it can
be used for regular encryption and decryption operations,
it is included here to unencrypt the configuration from mtd
on Arcadyan WG430223/WG443223 and TP-Link Deco S4 routers
endef
define Package/uencrypt/config

55
package/utils/uencrypt/src/uencrypt.c
View File

@ -5,6 +5,7 @@
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef USE_WOLFSSL
@ -14,7 +15,7 @@
# include <openssl/evp.h>
#endif
int do_crypt(FILE *infile, FILE *outfile, const char *key, const char *iv,
int do_crypt(FILE *infile, FILE *outfile, const EVP_CIPHER *cipher, const char *key, const char *iv,
int enc, int padding)
{
EVP_CIPHER_CTX *ctx;
@ -22,7 +23,7 @@ int do_crypt(FILE *infile, FILE *outfile, const char *key, const char *iv,
int inlen, outlen;
ctx = EVP_CIPHER_CTX_new();
EVP_CipherInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv, enc);
EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
EVP_CIPHER_CTX_set_padding(ctx, padding);
for (;;) {
@ -53,9 +54,27 @@ static void check_enc_dec(const int enc)
exit(EXIT_FAILURE);
}
#ifndef USE_WOLFSSL
static void print_ciphers(const OBJ_NAME *name,void *arg) {
fprintf(arg, "\t%s\n", name->name);
}
#endif
static void check_cipher(const EVP_CIPHER *cipher)
{
if (cipher == NULL) {
fprintf(stderr, "Error: invalid cipher: %s.\n", optarg);
#ifndef USE_WOLFSSL
fprintf(stderr, "Supported ciphers: \n", optarg);
OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, print_ciphers, stderr);
#endif
exit(EXIT_FAILURE);
}
}
static void show_usage(const char* name)
{
fprintf(stderr, "Usage: %s: [-d | -e] [-n] -k key -i iv\n"
fprintf(stderr, "Usage: %s: [-d | -e] [-n] -k key [-i iv] [-c cipher]\n"
"-d = decrypt; -e = encrypt; -n = no padding\n", name);
}
@ -67,10 +86,19 @@ int main(int argc, char *argv[])
long len;
int opt;
int padding = 1;
int need_iv = 1;
const EVP_CIPHER *cipher = EVP_aes_128_cbc();
int ret;
while ((opt = getopt(argc, argv, "dei:k:n")) != -1) {
while ((opt = getopt(argc, argv, "c:dei:k:n")) != -1) {
switch (opt) {
case 'c':
cipher = EVP_get_cipherbyname(optarg);
check_cipher(cipher);
int arglen = strlen(optarg);
if (arglen > 3 && strncmp(optarg+arglen-3, "ecb", 3) == 0) //if ends with "ecb"
need_iv = 0;
break;
case 'd':
check_enc_dec(enc);
enc = 0;
@ -81,16 +109,16 @@ int main(int argc, char *argv[])
break;
case 'i':
iv = OPENSSL_hexstr2buf((const char *)optarg, &len);
if (iv == NULL || len != 16) {
fprintf(stderr, "Error setting IV to %s. The IV should be 16 bytes, encoded in hex.\n",
if (iv == NULL) {
fprintf(stderr, "Error setting IV to %s. The IV should be encoded in hex.\n",
optarg);
exit(EINVAL);
}
break;
case 'k':
key = OPENSSL_hexstr2buf((const char *)optarg, &len);
if (key == NULL || len != 16) {
fprintf(stderr, "Error setting key to %s. The key should be 16 bytes, encoded in hex.\n",
if (key == NULL) {
fprintf(stderr, "Error setting key to %s. The key should be encoded in hex.\n",
optarg);
exit(EINVAL);
}
@ -103,12 +131,17 @@ int main(int argc, char *argv[])
exit(EINVAL);
}
}
if (iv == NULL || key == NULL) {
fprintf(stderr, "Error: %s not set.\n", key ? "iv" : (iv ? "key" : "key and iv"));
if (need_iv && iv == NULL) {
fprintf(stderr, "Error: iv not set.\n");
show_usage(argv[0]);
exit(EXIT_FAILURE);
}
if (key == NULL) {
fprintf(stderr, "Error: key not set.\n");
show_usage(argv[0]);
exit(EXIT_FAILURE);
}
ret = do_crypt(stdin, stdout, key, iv, !!enc, padding);
ret = do_crypt(stdin, stdout, cipher, key, iv, !!enc, padding);
if (ret)
fprintf(stderr, "Error during crypt operation.\n");
OPENSSL_free(iv);