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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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29
src/dh.c
View File

@@ -143,6 +143,8 @@ int ssh_get_random(void *where, int len, int strong){
return RAND_pseudo_bytes(where,len);
}
# endif /* OPENSSL_VERSION_NUMBER */
#elif defined HAVE_LIBMBEDCRYPTO
return ssh_mbedtls_random(where, len, strong);
#endif
/* never reached */
@@ -162,6 +164,8 @@ int ssh_crypto_init(void) {
gcry_control(GCRYCTL_INIT_SECMEM, 4096);
gcry_control(GCRYCTL_INITIALIZATION_FINISHED,0);
}
#elif HAVE_LIBMBEDCRYPTO
ssh_mbedtls_init();
#endif
g = bignum_new();
@@ -206,7 +210,12 @@ int ssh_crypto_init(void) {
bignum_bin2bn(p_group14_value, P_GROUP14_LEN, p_group14);
OpenSSL_add_all_algorithms();
#elif defined HAVE_LIBMBEDCRYPTO
p_group1 = bignum_new();
bignum_bin2bn(p_group1_value, P_GROUP1_LEN, p_group1);
p_group14 = bignum_new();
bignum_bin2bn(p_group14_value, P_GROUP14_LEN, p_group14);
#endif
ssh_crypto_initialized = 1;
@@ -228,6 +237,8 @@ void ssh_crypto_finalize(void) {
#elif defined HAVE_LIBCRYPTO
EVP_cleanup();
CRYPTO_cleanup_all_ex_data();
#elif defined HAVE_LIBMBEDTLS
ssh_mbedtls_cleanup();
#endif
ssh_crypto_initialized=0;
}
@@ -249,6 +260,8 @@ int ssh_dh_generate_x(ssh_session session) {
bignum_rand(session->next_crypto->x, keysize);
#elif defined HAVE_LIBCRYPTO
bignum_rand(session->next_crypto->x, keysize, -1, 0);
#elif defined HAVE_LIBMBEDCRYPTO
bignum_rand(session->next_crypto->x, keysize, -1, 0);
#endif
/* not harder than this */
@@ -276,6 +289,8 @@ int ssh_dh_generate_y(ssh_session session) {
bignum_rand(session->next_crypto->y, keysize);
#elif defined HAVE_LIBCRYPTO
bignum_rand(session->next_crypto->y, keysize, -1, 0);
#elif defined HAVE_LIBMBEDCRYPTO
bignum_rand(session->next_crypto->y, keysize, -1, 0);
#endif
/* not harder than this */
@@ -309,6 +324,9 @@ int ssh_dh_generate_e(ssh_session session) {
#elif defined HAVE_LIBCRYPTO
bignum_mod_exp(session->next_crypto->e, g, session->next_crypto->x,
select_p(session->next_crypto->kex_type), ctx);
#elif defined HAVE_LIBMBEDCRYPTO
bignum_mod_exp(session->next_crypto->e, g, session->next_crypto->x,
select_p(session->next_crypto->kex_type), NULL);
#endif
#ifdef DEBUG_CRYPTO
@@ -344,6 +362,9 @@ int ssh_dh_generate_f(ssh_session session) {
#elif defined HAVE_LIBCRYPTO
bignum_mod_exp(session->next_crypto->f, g, session->next_crypto->y,
select_p(session->next_crypto->kex_type), ctx);
#elif defined HAVE_LIBMBEDCRYPTO
bignum_mod_exp(session->next_crypto->f, g, session->next_crypto->y,
select_p(session->next_crypto->kex_type), NULL);
#endif
#ifdef DEBUG_CRYPTO
@@ -430,6 +451,14 @@ int ssh_dh_build_k(ssh_session session) {
bignum_mod_exp(session->next_crypto->k, session->next_crypto->e,
session->next_crypto->y, select_p(session->next_crypto->kex_type), ctx);
}
#elif defined HAVE_LIBMBEDCRYPTO
if (session->client) {
bignum_mod_exp(session->next_crypto->k, session->next_crypto->f,
session->next_crypto->x, select_p(session->next_crypto->kex_type), NULL);
} else {
bignum_mod_exp(session->next_crypto->k, session->next_crypto->e,
session->next_crypto->y, select_p(session->next_crypto->kex_type), NULL);
}
#endif
#ifdef DEBUG_CRYPTO