diff options
Diffstat (limited to 'src/streams/mbedtls.c')
| -rw-r--r-- | src/streams/mbedtls.c | 480 |
1 files changed, 0 insertions, 480 deletions
diff --git a/src/streams/mbedtls.c b/src/streams/mbedtls.c deleted file mode 100644 index b3a35ab02..000000000 --- a/src/streams/mbedtls.c +++ /dev/null @@ -1,480 +0,0 @@ -/* - * Copyright (C) the libgit2 contributors. All rights reserved. - * - * This file is part of libgit2, distributed under the GNU GPL v2 with - * a Linking Exception. For full terms see the included COPYING file. - */ - -#include "streams/mbedtls.h" - -#ifdef GIT_MBEDTLS - -#include <ctype.h> - -#include "runtime.h" -#include "stream.h" -#include "streams/socket.h" -#include "netops.h" -#include "git2/transport.h" -#include "util.h" - -#ifndef GIT_DEFAULT_CERT_LOCATION -#define GIT_DEFAULT_CERT_LOCATION NULL -#endif - -/* Work around C90-conformance issues */ -#if defined(_MSC_VER) -# define inline __inline -#elif defined(__GNUC__) -# define inline __inline__ -#else -# define inline -#endif - -#include <mbedtls/config.h> -#include <mbedtls/ssl.h> -#include <mbedtls/error.h> -#include <mbedtls/entropy.h> -#include <mbedtls/ctr_drbg.h> - -#undef inline - -#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 - -static mbedtls_ssl_config *git__ssl_conf; -static int ciphers_list[GIT_SSL_DEFAULT_CIPHERS_COUNT]; -static mbedtls_entropy_context *mbedtls_entropy; - -/** - * This function aims to clean-up the SSL context which - * we allocated. - */ -static void shutdown_ssl(void) -{ - if (git__ssl_conf) { - mbedtls_x509_crt_free(git__ssl_conf->ca_chain); - git__free(git__ssl_conf->ca_chain); - mbedtls_ctr_drbg_free(git__ssl_conf->p_rng); - git__free(git__ssl_conf->p_rng); - mbedtls_ssl_config_free(git__ssl_conf); - git__free(git__ssl_conf); - git__ssl_conf = NULL; - } - if (mbedtls_entropy) { - mbedtls_entropy_free(mbedtls_entropy); - git__free(mbedtls_entropy); - mbedtls_entropy = NULL; - } -} - -int git_mbedtls_stream_global_init(void) -{ - int loaded = 0; - char *crtpath = GIT_DEFAULT_CERT_LOCATION; - struct stat statbuf; - mbedtls_ctr_drbg_context *ctr_drbg = NULL; - - size_t ciphers_known = 0; - char *cipher_name = NULL; - char *cipher_string = NULL; - char *cipher_string_tmp = NULL; - - git__ssl_conf = git__malloc(sizeof(mbedtls_ssl_config)); - GIT_ERROR_CHECK_ALLOC(git__ssl_conf); - - mbedtls_ssl_config_init(git__ssl_conf); - if (mbedtls_ssl_config_defaults(git__ssl_conf, - MBEDTLS_SSL_IS_CLIENT, - MBEDTLS_SSL_TRANSPORT_STREAM, - MBEDTLS_SSL_PRESET_DEFAULT) != 0) { - git_error_set(GIT_ERROR_SSL, "failed to initialize mbedTLS"); - goto cleanup; - } - - /* configure TLSv1 */ - mbedtls_ssl_conf_min_version(git__ssl_conf, MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_0); - - /* verify_server_cert is responsible for making the check. - * OPTIONAL because REQUIRED drops the certificate as soon as the check - * is made, so we can never see the certificate and override it. */ - mbedtls_ssl_conf_authmode(git__ssl_conf, MBEDTLS_SSL_VERIFY_OPTIONAL); - - /* set the list of allowed ciphersuites */ - ciphers_known = 0; - cipher_string = cipher_string_tmp = git__strdup(GIT_SSL_DEFAULT_CIPHERS); - GIT_ERROR_CHECK_ALLOC(cipher_string); - - while ((cipher_name = git__strtok(&cipher_string_tmp, ":")) != NULL) { - int cipherid = mbedtls_ssl_get_ciphersuite_id(cipher_name); - if (cipherid == 0) continue; - - if (ciphers_known >= ARRAY_SIZE(ciphers_list)) { - git_error_set(GIT_ERROR_SSL, "out of cipher list space"); - goto cleanup; - } - - ciphers_list[ciphers_known++] = cipherid; - } - git__free(cipher_string); - - if (!ciphers_known) { - git_error_set(GIT_ERROR_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)); - GIT_ERROR_CHECK_ALLOC(mbedtls_entropy); - - mbedtls_entropy_init(mbedtls_entropy); - - ctr_drbg = git__malloc(sizeof(mbedtls_ctr_drbg_context)); - GIT_ERROR_CHECK_ALLOC(ctr_drbg); - - mbedtls_ctr_drbg_init(ctr_drbg); - - if (mbedtls_ctr_drbg_seed(ctr_drbg, - mbedtls_entropy_func, - mbedtls_entropy, NULL, 0) != 0) { - git_error_set(GIT_ERROR_SSL, "failed to initialize mbedTLS entropy pool"); - goto cleanup; - } - - mbedtls_ssl_conf_rng(git__ssl_conf, mbedtls_ctr_drbg_random, ctr_drbg); - - /* load default certificates */ - if (crtpath != NULL && stat(crtpath, &statbuf) == 0 && S_ISREG(statbuf.st_mode)) - loaded = (git_mbedtls__set_cert_location(crtpath, NULL) == 0); - if (!loaded && crtpath != NULL && stat(crtpath, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) - loaded = (git_mbedtls__set_cert_location(NULL, crtpath) == 0); - - return git_runtime_shutdown_register(shutdown_ssl); - -cleanup: - mbedtls_ctr_drbg_free(ctr_drbg); - git__free(ctr_drbg); - mbedtls_ssl_config_free(git__ssl_conf); - git__free(git__ssl_conf); - git__ssl_conf = NULL; - - return -1; -} - -static int bio_read(void *b, unsigned char *buf, size_t len) -{ - git_stream *io = (git_stream *) b; - return (int) git_stream_read(io, buf, min(len, INT_MAX)); -} - -static int bio_write(void *b, const unsigned char *buf, size_t len) -{ - git_stream *io = (git_stream *) b; - return (int) git_stream_write(io, (const char *)buf, min(len, INT_MAX), 0); -} - -static int ssl_set_error(mbedtls_ssl_context *ssl, int error) -{ - char errbuf[512]; - int ret = -1; - - GIT_ASSERT(error != MBEDTLS_ERR_SSL_WANT_READ); - GIT_ASSERT(error != MBEDTLS_ERR_SSL_WANT_WRITE); - - if (error != 0) - mbedtls_strerror( error, errbuf, 512 ); - - switch(error) { - case 0: - git_error_set(GIT_ERROR_SSL, "SSL error: unknown error"); - break; - - case MBEDTLS_ERR_X509_CERT_VERIFY_FAILED: - git_error_set(GIT_ERROR_SSL, "SSL error: %#04x [%x] - %s", error, ssl->session_negotiate->verify_result, errbuf); - ret = GIT_ECERTIFICATE; - break; - - default: - git_error_set(GIT_ERROR_SSL, "SSL error: %#04x - %s", error, errbuf); - } - - return ret; -} - -static int ssl_teardown(mbedtls_ssl_context *ssl) -{ - int ret = 0; - - ret = mbedtls_ssl_close_notify(ssl); - if (ret < 0) - ret = ssl_set_error(ssl, ret); - - mbedtls_ssl_free(ssl); - return ret; -} - -static int verify_server_cert(mbedtls_ssl_context *ssl) -{ - int ret = -1; - - if ((ret = mbedtls_ssl_get_verify_result(ssl)) != 0) { - char vrfy_buf[512]; - int len = mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), "", ret); - if (len >= 1) vrfy_buf[len - 1] = '\0'; /* Remove trailing \n */ - git_error_set(GIT_ERROR_SSL, "the SSL certificate is invalid: %#04x - %s", ret, vrfy_buf); - return GIT_ECERTIFICATE; - } - - return 0; -} - -typedef struct { - git_stream parent; - git_stream *io; - int owned; - bool connected; - char *host; - mbedtls_ssl_context *ssl; - git_cert_x509 cert_info; -} mbedtls_stream; - - -static int mbedtls_connect(git_stream *stream) -{ - int ret; - mbedtls_stream *st = (mbedtls_stream *) stream; - - if (st->owned && (ret = git_stream_connect(st->io)) < 0) - return ret; - - st->connected = true; - - mbedtls_ssl_set_hostname(st->ssl, st->host); - - mbedtls_ssl_set_bio(st->ssl, st->io, bio_write, bio_read, NULL); - - if ((ret = mbedtls_ssl_handshake(st->ssl)) != 0) - return ssl_set_error(st->ssl, ret); - - return verify_server_cert(st->ssl); -} - -static int mbedtls_certificate(git_cert **out, git_stream *stream) -{ - unsigned char *encoded_cert; - mbedtls_stream *st = (mbedtls_stream *) stream; - - const mbedtls_x509_crt *cert = mbedtls_ssl_get_peer_cert(st->ssl); - if (!cert) { - git_error_set(GIT_ERROR_SSL, "the server did not provide a certificate"); - return -1; - } - - /* Retrieve the length of the certificate first */ - if (cert->raw.len == 0) { - git_error_set(GIT_ERROR_NET, "failed to retrieve certificate information"); - return -1; - } - - encoded_cert = git__malloc(cert->raw.len); - GIT_ERROR_CHECK_ALLOC(encoded_cert); - memcpy(encoded_cert, cert->raw.p, cert->raw.len); - - st->cert_info.parent.cert_type = GIT_CERT_X509; - st->cert_info.data = encoded_cert; - st->cert_info.len = cert->raw.len; - - *out = &st->cert_info.parent; - - return 0; -} - -static int mbedtls_set_proxy(git_stream *stream, const git_proxy_options *proxy_options) -{ - mbedtls_stream *st = (mbedtls_stream *) stream; - - return git_stream_set_proxy(st->io, proxy_options); -} - -static ssize_t mbedtls_stream_write(git_stream *stream, const char *data, size_t len, int flags) -{ - mbedtls_stream *st = (mbedtls_stream *) stream; - int written; - - GIT_UNUSED(flags); - - /* - * `mbedtls_ssl_write` can only represent INT_MAX bytes - * written via its return value. We thus need to clamp - * the maximum number of bytes written. - */ - len = min(len, INT_MAX); - - if ((written = mbedtls_ssl_write(st->ssl, (const unsigned char *)data, len)) <= 0) - return ssl_set_error(st->ssl, written); - - return written; -} - -static ssize_t mbedtls_stream_read(git_stream *stream, void *data, size_t len) -{ - mbedtls_stream *st = (mbedtls_stream *) stream; - int ret; - - if ((ret = mbedtls_ssl_read(st->ssl, (unsigned char *)data, len)) <= 0) - ssl_set_error(st->ssl, ret); - - return ret; -} - -static int mbedtls_stream_close(git_stream *stream) -{ - mbedtls_stream *st = (mbedtls_stream *) stream; - int ret = 0; - - if (st->connected && (ret = ssl_teardown(st->ssl)) != 0) - return -1; - - st->connected = false; - - return st->owned ? git_stream_close(st->io) : 0; -} - -static void mbedtls_stream_free(git_stream *stream) -{ - mbedtls_stream *st = (mbedtls_stream *) stream; - - if (st->owned) - git_stream_free(st->io); - - git__free(st->host); - git__free(st->cert_info.data); - mbedtls_ssl_free(st->ssl); - git__free(st->ssl); - git__free(st); -} - -static int mbedtls_stream_wrap( - git_stream **out, - git_stream *in, - const char *host, - int owned) -{ - mbedtls_stream *st; - int error; - - st = git__calloc(1, sizeof(mbedtls_stream)); - GIT_ERROR_CHECK_ALLOC(st); - - st->io = in; - st->owned = owned; - - st->ssl = git__malloc(sizeof(mbedtls_ssl_context)); - GIT_ERROR_CHECK_ALLOC(st->ssl); - mbedtls_ssl_init(st->ssl); - if (mbedtls_ssl_setup(st->ssl, git__ssl_conf)) { - git_error_set(GIT_ERROR_SSL, "failed to create ssl object"); - error = -1; - goto out_err; - } - - st->host = git__strdup(host); - GIT_ERROR_CHECK_ALLOC(st->host); - - st->parent.version = GIT_STREAM_VERSION; - st->parent.encrypted = 1; - st->parent.proxy_support = git_stream_supports_proxy(st->io); - st->parent.connect = mbedtls_connect; - st->parent.certificate = mbedtls_certificate; - st->parent.set_proxy = mbedtls_set_proxy; - st->parent.read = mbedtls_stream_read; - st->parent.write = mbedtls_stream_write; - st->parent.close = mbedtls_stream_close; - st->parent.free = mbedtls_stream_free; - - *out = (git_stream *) st; - return 0; - -out_err: - mbedtls_ssl_free(st->ssl); - git_stream_close(st->io); - git_stream_free(st->io); - git__free(st); - - return error; -} - -int git_mbedtls_stream_wrap( - git_stream **out, - git_stream *in, - const char *host) -{ - return mbedtls_stream_wrap(out, in, host, 0); -} - -int git_mbedtls_stream_new( - git_stream **out, - const char *host, - const char *port) -{ - git_stream *stream; - int error; - - GIT_ASSERT_ARG(out); - GIT_ASSERT_ARG(host); - GIT_ASSERT_ARG(port); - - if ((error = git_socket_stream_new(&stream, host, port)) < 0) - return error; - - if ((error = mbedtls_stream_wrap(out, stream, host, 1)) < 0) { - git_stream_close(stream); - git_stream_free(stream); - } - - return error; -} - -int git_mbedtls__set_cert_location(const char *file, const char *path) -{ - int ret = 0; - char errbuf[512]; - mbedtls_x509_crt *cacert; - - GIT_ASSERT_ARG(file || path); - - cacert = git__malloc(sizeof(mbedtls_x509_crt)); - GIT_ERROR_CHECK_ALLOC(cacert); - - mbedtls_x509_crt_init(cacert); - if (file) - ret = mbedtls_x509_crt_parse_file(cacert, file); - if (ret >= 0 && path) - ret = mbedtls_x509_crt_parse_path(cacert, path); - /* mbedtls_x509_crt_parse_path returns the number of invalid certs on success */ - if (ret < 0) { - mbedtls_x509_crt_free(cacert); - git__free(cacert); - mbedtls_strerror( ret, errbuf, 512 ); - git_error_set(GIT_ERROR_SSL, "failed to load CA certificates: %#04x - %s", ret, errbuf); - return -1; - } - - mbedtls_x509_crt_free(git__ssl_conf->ca_chain); - git__free(git__ssl_conf->ca_chain); - mbedtls_ssl_conf_ca_chain(git__ssl_conf, cacert, NULL); - - return 0; -} - -#else - -#include "stream.h" - -int git_mbedtls_stream_global_init(void) -{ - return 0; -} - -#endif |