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mbedTLS support #4173

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Merged
merged 15 commits into from
Apr 22, 2018
Merged

mbedTLS support #4173

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ca3b223
mbedtls: initial support
tiennou Mar 29, 2018
1a1875f
mbedtls: proper certificate verification
tiennou Mar 29, 2018
6c6be3c
mbedtls: use libmbedcrypto for hashing
tiennou Mar 29, 2018
60e1ad9
mbedtls: add global initialization
tiennou Mar 29, 2018
2419ccc
mbedtls: default cipher list support
tiennou Mar 29, 2018
ec79b0f
mbedtls: fix libgit2 hanging due to incomplete writes
tiennou Mar 29, 2018
262dfcf
mbedtls: enable Travis CI tests
tiennou Mar 29, 2018
4165bb7
mbedtls: use our own certificate validation
tiennou Mar 29, 2018
1edde0b
mbedtls: use mbedTLS certificate verification
tiennou Mar 29, 2018
382ed1e
mbedtls: load default CA certificates
tiennou Mar 29, 2018
b3e0280
mbedtls: display error codes as hex for consistency with mbedTLS docs
tiennou Mar 29, 2018
e3d764a
tests: clarify comment
tiennou Mar 29, 2018
5455475
cmake: make our preferred backend ordering consistent
tiennou Mar 29, 2018
10aff3d
travis: just grab what we need from mbedtls
tiennou Mar 29, 2018
cb2da47
travis: pass -fPIC when configuring mbedtls
tiennou Mar 29, 2018
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mbedtls: default cipher list support
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@tiennou
tiennou committed Apr 11, 2018
commit 2419cccd16ae6585e2b58360dc6a53304a3baee8
2 changes: 1 addition & 1 deletion src/settings.c
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Original file line number Diff line number Diff line change
Expand Up @@ -210,7 +210,7 @@ int git_libgit2_opts(int key, ...)
break;

case GIT_OPT_SET_SSL_CIPHERS:
#ifdef GIT_OPENSSL
#if (GIT_OPENSSL || GIT_MBEDTLS)
{
git__free(git__ssl_ciphers);
git__ssl_ciphers = git__strdup(va_arg(ap, const char *));
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29 changes: 29 additions & 0 deletions src/streams/mbedtls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
#include "streams/socket.h"
#include "netops.h"
#include "git2/transport.h"
#include "util.h"

#ifdef GIT_CURL
# include "streams/curl.h"
Expand All @@ -31,6 +32,9 @@
mbedtls_ssl_config *git__ssl_conf;
mbedtls_entropy_context *mbedtls_entropy;

#define GIT_SSL_DEFAULT_CIPHERS "TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256:TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256:TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384:TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384:TLS-DHE-RSA-WITH-AES-128-GCM-SHA256:TLS-DHE-DSS-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-256-GCM-SHA384:TLS-DHE-DSS-WITH-AES-256-GCM-SHA384:TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA256:TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA256:TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA:TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA:TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA384:TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA384:TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA:TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA:TLS-DHE-RSA-WITH-AES-128-CBC-SHA256:TLS-DHE-RSA-WITH-AES-256-CBC-SHA256:TLS-DHE-RSA-WITH-AES-128-CBC-SHA:TLS-DHE-RSA-WITH-AES-256-CBC-SHA:TLS-DHE-DSS-WITH-AES-128-CBC-SHA256:TLS-DHE-DSS-WITH-AES-256-CBC-SHA256:TLS-DHE-DSS-WITH-AES-128-CBC-SHA:TLS-DHE-DSS-WITH-AES-256-CBC-SHA:TLS-RSA-WITH-AES-128-GCM-SHA256:TLS-RSA-WITH-AES-256-GCM-SHA384:TLS-RSA-WITH-AES-128-CBC-SHA256:TLS-RSA-WITH-AES-256-CBC-SHA256:TLS-RSA-WITH-AES-128-CBC-SHA:TLS-RSA-WITH-AES-256-CBC-SHA"
#define GIT_SSL_DEFAULT_CIPHERS_COUNT 30

/**
* This function aims to clean-up the SSL context which
* we allocated.
Expand All @@ -57,6 +61,13 @@ int git_mbedtls_stream_global_init(void)
{
int ret;
mbedtls_ctr_drbg_context *ctr_drbg = NULL;

int *ciphers_list = NULL;
int ciphers_known = 0;
char *cipher_name = NULL;
char *cipher_string = NULL;
char *cipher_string_tmp = NULL;

mbedtls_x509_crt *cacert = NULL;

git__ssl_conf = git__malloc(sizeof(mbedtls_ssl_config));
Expand All @@ -73,6 +84,24 @@ int git_mbedtls_stream_global_init(void)
mbedtls_ssl_conf_min_version(git__ssl_conf, MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_0);
mbedtls_ssl_conf_authmode(git__ssl_conf, MBEDTLS_SSL_VERIFY_REQUIRED);

/* set the list of allowed ciphersuites */
ciphers_list = calloc(GIT_SSL_DEFAULT_CIPHERS_COUNT, sizeof(int));
ciphers_known = 0;
cipher_string = cipher_string_tmp = git__strdup(GIT_SSL_DEFAULT_CIPHERS);
while ((cipher_name = git__strtok(&cipher_string_tmp, ":")) != NULL) {
int cipherid = mbedtls_ssl_get_ciphersuite_id(cipher_name);
if (cipherid == 0) continue;

ciphers_list[ciphers_known++] = cipherid;
}
git__free(cipher_string);

if (!ciphers_known) {
giterr_set(GITERR_SSL, "no cipher could be enabled");
goto cleanup;
}
mbedtls_ssl_conf_ciphersuites(git__ssl_conf, ciphers_list);

/* Seeding the random number generator */
mbedtls_entropy = git__malloc(sizeof(mbedtls_entropy_context));
mbedtls_entropy_init(mbedtls_entropy);
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