static int ssl_setup(git_transport *t, const char *host)
{
int ret;
SSL_library_init();
SSL_load_error_strings();
t->ssl.ctx = SSL_CTX_new(SSLv23_method());
if (t->ssl.ctx == NULL)
return ssl_set_error(&t->ssl, 0);
SSL_CTX_set_mode(t->ssl.ctx, SSL_MODE_AUTO_RETRY);
SSL_CTX_set_verify(t->ssl.ctx, SSL_VERIFY_PEER, NULL);
if (!SSL_CTX_set_default_verify_paths(t->ssl.ctx))
return ssl_set_error(&t->ssl, 0);
t->ssl.ssl = SSL_new(t->ssl.ctx);
if (t->ssl.ssl == NULL)
return ssl_set_error(&t->ssl, 0);
if((ret = SSL_set_fd(t->ssl.ssl, t->socket)) == 0)
return ssl_set_error(&t->ssl, ret);
if ((ret = SSL_connect(t->ssl.ssl)) <= 0)
return ssl_set_error(&t->ssl, ret);
if (t->check_cert && verify_server_cert(t, host) < 0)
return -1;
return 0;
}
static int ssl_setup(gitno_socket *socket, const char *host, int flags)
{
int ret;
SSL_library_init();
SSL_load_error_strings();
socket->ssl.ctx = SSL_CTX_new(SSLv23_method());
if (socket->ssl.ctx == NULL)
return ssl_set_error(&socket->ssl, 0);
SSL_CTX_set_mode(socket->ssl.ctx, SSL_MODE_AUTO_RETRY);
SSL_CTX_set_verify(socket->ssl.ctx, SSL_VERIFY_NONE, NULL);
if (!SSL_CTX_set_default_verify_paths(socket->ssl.ctx))
return ssl_set_error(&socket->ssl, 0);
socket->ssl.ssl = SSL_new(socket->ssl.ctx);
if (socket->ssl.ssl == NULL)
return ssl_set_error(&socket->ssl, 0);
if((ret = SSL_set_fd(socket->ssl.ssl, socket->socket)) == 0)
return ssl_set_error(&socket->ssl, ret);
if ((ret = SSL_connect(socket->ssl.ssl)) <= 0)
return ssl_set_error(&socket->ssl, ret);
if (GITNO_CONNECT_SSL_NO_CHECK_CERT & flags)
return 0;
return verify_server_cert(&socket->ssl, host);
}
int openssl_connect(git_stream *stream)
{
int ret;
BIO *bio;
openssl_stream *st = (openssl_stream *) stream;
if ((ret = git_stream_connect(st->io)) < 0)
return ret;
st->connected = true;
bio = BIO_new(&git_stream_bio_method);
GITERR_CHECK_ALLOC(bio);
bio->ptr = st->io;
SSL_set_bio(st->ssl, bio, bio);
/* specify the host in case SNI is needed */
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
SSL_set_tlsext_host_name(st->ssl, st->host);
#endif
if ((ret = SSL_connect(st->ssl)) <= 0)
return ssl_set_error(st->ssl, ret);
return verify_server_cert(st->ssl, st->host);
}
int openssl_connect(git_stream *stream)
{
int ret;
openssl_stream *st = (openssl_stream *) stream;
if ((ret = git_stream_connect((git_stream *)st->socket)) < 0)
return ret;
if ((ret = SSL_set_fd(st->ssl, st->socket->s)) <= 0) {
openssl_close((git_stream *) st);
return ssl_set_error(st->ssl, ret);
}
if ((ret = SSL_connect(st->ssl)) <= 0)
return ssl_set_error(st->ssl, ret);
return verify_server_cert(st->ssl, st->socket->host);
}
ssize_t openssl_read(git_stream *stream, void *data, size_t len)
{
openssl_stream *st = (openssl_stream *) stream;
int ret;
if ((ret = SSL_read(st->ssl, data, len)) <= 0)
ssl_set_error(st->ssl, ret);
return ret;
}
static int ssl_teardown(SSL *ssl)
{
int ret;
ret = SSL_shutdown(ssl);
if (ret < 0)
ret = ssl_set_error(ssl, ret);
else
ret = 0;
return ret;
}
int openssl_connect(git_stream *stream)
{
int ret;
openssl_stream *st = (openssl_stream *) stream;
if ((ret = git_stream_connect((git_stream *)st->socket)) < 0)
return ret;
if ((ret = SSL_set_fd(st->ssl, st->socket->s)) <= 0) {
openssl_close((git_stream *) st);
return ssl_set_error(st->ssl, ret);
}
/* specify the host in case SNI is needed */
SSL_set_tlsext_host_name(st->ssl, st->socket->host);
if ((ret = SSL_connect(st->ssl)) <= 0)
return ssl_set_error(st->ssl, ret);
return verify_server_cert(st->ssl, st->socket->host);
}
ssize_t openssl_write(git_stream *stream, const char *data, size_t len, int flags)
{
openssl_stream *st = (openssl_stream *) stream;
int ret;
GIT_UNUSED(flags);
if ((ret = SSL_write(st->ssl, data, len)) <= 0) {
return ssl_set_error(st->ssl, ret);
}
return ret;
}
static int ssl_recv(gitno_ssl *ssl, void *data, size_t len)
{
int ret;
do {
ret = SSL_read(ssl->ssl, data, len);
} while (SSL_get_error(ssl->ssl, ret) == SSL_ERROR_WANT_READ);
if (ret < 0)
return ssl_set_error(ssl, ret);
return ret;
}
static int gitno_ssl_teardown(gitno_ssl *ssl)
{
int ret;
ret = SSL_shutdown(ssl->ssl);
if (ret < 0)
ret = ssl_set_error(ssl, ret);
else
ret = 0;
SSL_free(ssl->ssl);
SSL_CTX_free(ssl->ctx);
return ret;
}
static int send_ssl(gitno_ssl *ssl, const char *msg, size_t len)
{
int ret;
size_t off = 0;
while (off < len) {
ret = SSL_write(ssl->ssl, msg + off, len - off);
if (ret <= 0)
return ssl_set_error(ssl, ret);
off += ret;
}
return off;
}
ssize_t openssl_read(git_stream *stream, void *data, size_t len)
{
openssl_stream *st = (openssl_stream *) stream;
int ret;
do {
ret = SSL_read(st->ssl, data, len);
} while (SSL_get_error(st->ssl, ret) == SSL_ERROR_WANT_READ);
if (ret < 0) {
ssl_set_error(st->ssl, ret);
return -1;
}
return ret;
}
static int gitno_send_ssl(gitno_ssl *ssl, const char *msg, size_t len, int flags)
{
int ret;
size_t off = 0;
GIT_UNUSED(flags);
while (off < len) {
ret = SSL_write(ssl->ssl, msg + off, len - off);
if (ret <= 0 && ret != SSL_ERROR_WANT_WRITE)
return ssl_set_error(ssl, ret);
off += ret;
}
return off;
}
ssize_t openssl_write(git_stream *stream, const char *data, size_t len, int flags)
{
openssl_stream *st = (openssl_stream *) stream;
int ret;
size_t off = 0;
GIT_UNUSED(flags);
while (off < len) {
ret = SSL_write(st->ssl, data + off, len - off);
if (ret <= 0 && ret != SSL_ERROR_WANT_WRITE)
return ssl_set_error(st->ssl, ret);
off += ret;
}
return off;
}
int gitno_ssl_teardown(git_transport *t)
{
#ifdef GIT_SSL
int ret;
#endif
if (!t->use_ssl)
return 0;
#ifdef GIT_SSL
do {
ret = SSL_shutdown(t->ssl.ssl);
} while (ret == 0);
if (ret < 0)
return ssl_set_error(&t->ssl, ret);
SSL_free(t->ssl.ssl);
SSL_CTX_free(t->ssl.ctx);
#endif
return 0;
}
static int verify_server_cert(SSL *ssl, const char *host)
{
X509 *cert;
X509_NAME *peer_name;
ASN1_STRING *str;
unsigned char *peer_cn = NULL;
int matched = -1, type = GEN_DNS;
GENERAL_NAMES *alts;
struct in6_addr addr6;
struct in_addr addr4;
void *addr;
int i = -1,j;
if (SSL_get_verify_result(ssl) != X509_V_OK) {
giterr_set(GITERR_SSL, "The SSL certificate is invalid");
return GIT_ECERTIFICATE;
}
/* Try to parse the host as an IP address to see if it is */
if (p_inet_pton(AF_INET, host, &addr4)) {
type = GEN_IPADD;
addr = &addr4;
} else {
if(p_inet_pton(AF_INET6, host, &addr6)) {
type = GEN_IPADD;
addr = &addr6;
}
}
cert = SSL_get_peer_certificate(ssl);
if (!cert) {
giterr_set(GITERR_SSL, "the server did not provide a certificate");
return -1;
}
/* Check the alternative names */
alts = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
if (alts) {
int num;
num = sk_GENERAL_NAME_num(alts);
for (i = 0; i < num && matched != 1; i++) {
const GENERAL_NAME *gn = sk_GENERAL_NAME_value(alts, i);
const char *name = (char *) ASN1_STRING_data(gn->d.ia5);
size_t namelen = (size_t) ASN1_STRING_length(gn->d.ia5);
/* Skip any names of a type we're not looking for */
if (gn->type != type)
continue;
if (type == GEN_DNS) {
/* If it contains embedded NULs, don't even try */
if (memchr(name, '\0', namelen))
continue;
if (check_host_name(name, host) < 0)
matched = 0;
else
matched = 1;
} else if (type == GEN_IPADD) {
/* Here name isn't so much a name but a binary representation of the IP */
matched = !!memcmp(name, addr, namelen);
}
}
}
GENERAL_NAMES_free(alts);
if (matched == 0)
goto cert_fail_name;
if (matched == 1)
return 0;
/* If no alternative names are available, check the common name */
peer_name = X509_get_subject_name(cert);
if (peer_name == NULL)
goto on_error;
if (peer_name) {
/* Get the index of the last CN entry */
while ((j = X509_NAME_get_index_by_NID(peer_name, NID_commonName, i)) >= 0)
i = j;
}
if (i < 0)
goto on_error;
str = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(peer_name, i));
if (str == NULL)
goto on_error;
/* Work around a bug in OpenSSL whereby ASN1_STRING_to_UTF8 fails if it's already in utf-8 */
if (ASN1_STRING_type(str) == V_ASN1_UTF8STRING) {
int size = ASN1_STRING_length(str);
if (size > 0) {
peer_cn = OPENSSL_malloc(size + 1);
GITERR_CHECK_ALLOC(peer_cn);
memcpy(peer_cn, ASN1_STRING_data(str), size);
peer_cn[size] = '\0';
} else {
goto cert_fail_name;
}
} else {
int size = ASN1_STRING_to_UTF8(&peer_cn, str);
GITERR_CHECK_ALLOC(peer_cn);
if (memchr(peer_cn, '\0', size))
goto cert_fail_name;
}
if (check_host_name((char *)peer_cn, host) < 0)
goto cert_fail_name;
OPENSSL_free(peer_cn);
return 0;
on_error:
OPENSSL_free(peer_cn);
return ssl_set_error(ssl, 0);
cert_fail_name:
OPENSSL_free(peer_cn);
giterr_set(GITERR_SSL, "hostname does not match certificate");
return GIT_ECERTIFICATE;
}
