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add mbedtls crypto support

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Summary:
This patch adds support for mbedTLS as a crypto backend for libssh.
mbedTLS is an SSL/TLS library that has been designed to mainly be used
in embedded systems.  It is loosely coupled and has a low memory
footprint.  mbedTLS also provides a cryptography library (libmbedcrypto)
that can be used without the TLS modules.
The patch is unfortunately quite big, since several new files had to
be added.
DSA is disabled at compile time, since mbedTLS doesn't support DSA
Patch review and feedback would be appreciated, and if any issues or
suggestions appear, I'm willing to work on them.

Signed-off-by: Juraj Vijtiuk <juraj.vijtiuk@sartura.hr>

Test Plan:
* The patch has been tested with a Debug and MinSizeRel build, with
libssh unit tests, client tests and the pkd tests.
* All the tests have been run with valgrind's memcheck, drd and helgrind
tools.
* The examples/samplessh client works when built with the patch.

Reviewers: asn, aris

Subscribers: simonsj

Differential Revision: https://bugs.libssh.org/D1
This commit is contained in:
Juraj Vijtiuk
2017-12-28 11:10:43 +01:00
committed by Andreas Schneider
parent 5c3b1ee0a4
commit 778652460f
42 changed files with 3526 additions and 10 deletions
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15
src/pki.c
View File

@@ -138,6 +138,16 @@ void ssh_key_clean (ssh_key key){
#ifdef HAVE_OPENSSL_ECC
if(key->ecdsa) EC_KEY_free(key->ecdsa);
#endif /* HAVE_OPENSSL_ECC */
#elif defined HAVE_LIBMBEDCRYPTO
if (key->rsa != NULL) {
mbedtls_pk_free(key->rsa);
SAFE_FREE(key->rsa);
}
if (key->ecdsa != NULL) {
mbedtls_ecdsa_free(key->ecdsa);
SAFE_FREE(key->ecdsa);
}
#endif
if (key->ed25519_privkey != NULL){
BURN_BUFFER(key->ed25519_privkey, sizeof(ed25519_privkey));
@@ -354,6 +364,8 @@ void ssh_signature_free(ssh_signature sig)
gcry_sexp_release(sig->rsa_sig);
#elif defined HAVE_LIBCRYPTO
SAFE_FREE(sig->rsa_sig);
#elif defined HAVE_LIBMBEDCRYPTO
SAFE_FREE(sig->rsa_sig);
#endif
break;
case SSH_KEYTYPE_ECDSA:
@@ -361,6 +373,9 @@ void ssh_signature_free(ssh_signature sig)
gcry_sexp_release(sig->ecdsa_sig);
#elif defined(HAVE_LIBCRYPTO) && defined(HAVE_OPENSSL_ECC)
ECDSA_SIG_free(sig->ecdsa_sig);
#elif defined HAVE_LIBMBEDCRYPTO
bignum_free(sig->ecdsa_sig.r);
bignum_free(sig->ecdsa_sig.s);
#endif
break;
case SSH_KEYTYPE_ED25519: