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openssl.c : Fix use-after-free crash on reinitialization of openssl backend

Browse Source 
file : openssl.c

notes : 
libssh2's openssl backend has a use-after-free condition if HAVE_OPAQUE_STRUCTS is defined and you call libssh2_init() again after prior initialisation/deinitialisation of libssh2

credit : Thilo Schulz
This commit is contained in:
Thilo Schulz
2019-07-12 18:56:55 +02:00
committed by Will Cosgrove
parent ff2bce3057
commit d333e539f8
1 changed files with 18 additions and 21 deletions
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33
src/openssl.c
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@@ -589,14 +589,12 @@ const EVP_CIPHER *
_libssh2_EVP_aes_128_ctr(void)
{
#ifdef HAVE_OPAQUE_STRUCTS
static EVP_CIPHER * aes_ctr_cipher;
return !aes_ctr_cipher ?
make_ctr_evp(16, &aes_ctr_cipher, NID_aes_128_ctr) : aes_ctr_cipher;
EVP_CIPHER * aes_ctr_cipher;
return make_ctr_evp(16, &aes_ctr_cipher, NID_aes_128_ctr);
#else
static EVP_CIPHER aes_ctr_cipher;
static EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return !aes_ctr_cipher.key_len ?
make_ctr_evp(16, &aes_ctr_cipher_ptr, 0) : &aes_ctr_cipher;
EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return make_ctr_evp(16, &aes_ctr_cipher_ptr, 0);
#endif
}
@@ -604,14 +602,12 @@ const EVP_CIPHER *
_libssh2_EVP_aes_192_ctr(void)
{
#ifdef HAVE_OPAQUE_STRUCTS
static EVP_CIPHER * aes_ctr_cipher;
return !aes_ctr_cipher ?
make_ctr_evp(24, &aes_ctr_cipher, NID_aes_192_ctr) : aes_ctr_cipher;
EVP_CIPHER * aes_ctr_cipher;
return make_ctr_evp(24, &aes_ctr_cipher, NID_aes_192_ctr);
#else
static EVP_CIPHER aes_ctr_cipher;
static EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return !aes_ctr_cipher.key_len ?
make_ctr_evp(24, &aes_ctr_cipher_ptr, 0) : &aes_ctr_cipher;
EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return make_ctr_evp(24, &aes_ctr_cipher_ptr, 0);
#endif
}
@@ -619,14 +615,12 @@ const EVP_CIPHER *
_libssh2_EVP_aes_256_ctr(void)
{
#ifdef HAVE_OPAQUE_STRUCTS
static EVP_CIPHER * aes_ctr_cipher;
return !aes_ctr_cipher ?
make_ctr_evp(32, &aes_ctr_cipher, NID_aes_256_ctr) : aes_ctr_cipher;
EVP_CIPHER * aes_ctr_cipher;
return make_ctr_evp(32, &aes_ctr_cipher, NID_aes_256_ctr);
#else
static EVP_CIPHER aes_ctr_cipher;
static EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return !aes_ctr_cipher.key_len ?
make_ctr_evp(32, &aes_ctr_cipher_ptr, 0) : &aes_ctr_cipher;
EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return make_ctr_evp(32, &aes_ctr_cipher_ptr, 0);
#endif
}
@@ -656,8 +650,11 @@ void _libssh2_openssl_crypto_init(void)
#endif
#endif
#ifndef HAVE_EVP_AES_128_CTR
if(!aes_128_ctr_cipher)
aes_128_ctr_cipher = (EVP_CIPHER *) _libssh2_EVP_aes_128_ctr();
if(!aes_192_ctr_cipher)
aes_192_ctr_cipher = (EVP_CIPHER *) _libssh2_EVP_aes_192_ctr();
if(!aes_256_ctr_cipher)
aes_256_ctr_cipher = (EVP_CIPHER *) _libssh2_EVP_aes_256_ctr();
#endif
}