src/lib-ssl-iostream/iostream-ssl.c

	iostream-ssl.c revision 814bf67459ad405a157af0b8940602024d7fadfe
/* Copyright (c) 2009-2015 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "module-dir.h"
#include "iostream-ssl-private.h"


static bool ssl_module_loaded = FALSE;
#ifdef HAVE_SSL
static struct module *ssl_module = NULL;
#endif
static const struct iostream_ssl_vfuncs *ssl_vfuncs = NULL;

#ifdef HAVE_SSL
static void ssl_module_unload(void)
{
    module_dir_deinit(ssl_module);
    ssl_vfuncs->global_deinit();
    module_dir_unload(&ssl_module);
}
#endif

static int ssl_module_load(const char **error_r)
{
#ifdef HAVE_SSL
    const char *plugin_name = "ssl_iostream_openssl";
    struct module_dir_load_settings mod_set;

    memset(&mod_set, 0, sizeof(mod_set));
    mod_set.abi_version = DOVECOT_ABI_VERSION;
    mod_set.setting_name = "<built-in lib-ssl-iostream lookup>";
    ssl_module = module_dir_load(MODULE_DIR, plugin_name, &mod_set);

    ssl_vfuncs = module_get_symbol(ssl_module, "ssl_vfuncs");
    if (ssl_vfuncs == NULL) {
        *error_r = t_strdup_printf("%s: Broken plugin: "
            "ssl_vfuncs symbol not found", plugin_name);
        module_dir_unload(&ssl_module);
        return -1;
    }

    /* Destroy SSL module after (most of) the others. Especially lib-fs
       backends may still want to access SSL module in their own
       atexit-callbacks. */
    lib_atexit_priority(ssl_module_unload, LIB_ATEXIT_PRIORITY_LOW);
    ssl_module_loaded = TRUE;
    return 0;
#else
    *error_r = "SSL support not compiled in";
    return -1;
#endif
}

int ssl_iostream_context_init_client(const struct ssl_iostream_settings *set,
                     struct ssl_iostream_context **ctx_r,
                     const char **error_r)
{
    if (!ssl_module_loaded) {
        if (ssl_module_load(error_r) < 0)
            return -1;
    }
    return ssl_vfuncs->context_init_client(set, ctx_r, error_r);
}

int ssl_iostream_context_init_server(const struct ssl_iostream_settings *set,
                     struct ssl_iostream_context **ctx_r,
                     const char **error_r)
{
    if (!ssl_module_loaded) {
        if (ssl_module_load(error_r) < 0)
            return -1;
    }
    return ssl_vfuncs->context_init_server(set, ctx_r, error_r);
}

void ssl_iostream_context_deinit(struct ssl_iostream_context **_ctx)
{
    struct ssl_iostream_context *ctx = *_ctx;

    *_ctx = NULL;
    ssl_vfuncs->context_deinit(ctx);
}

int ssl_iostream_generate_params(buffer_t *output, unsigned int dh_length,
                 const char **error_r)
{
    if (!ssl_module_loaded) {
        if (ssl_module_load(error_r) < 0)
            return -1;
    }
    return ssl_vfuncs->generate_params(output, dh_length, error_r);
}

int ssl_iostream_context_import_params(struct ssl_iostream_context *ctx,
                       const buffer_t *input)
{
    return ssl_vfuncs->context_import_params(ctx, input);
}

int io_stream_create_ssl_client(struct ssl_iostream_context *ctx, const char *host,
                const struct ssl_iostream_settings *set,
                struct istream **input, struct ostream **output,
                struct ssl_iostream **iostream_r,
                const char **error_r)
{
    return ssl_vfuncs->create(ctx, host, set, input, output,
                  iostream_r, error_r);
}

int io_stream_create_ssl_server(struct ssl_iostream_context *ctx,
                const struct ssl_iostream_settings *set,
                struct istream **input, struct ostream **output,
                struct ssl_iostream **iostream_r,
                const char **error_r)
{
    return ssl_vfuncs->create(ctx, NULL, set, input, output,
                  iostream_r, error_r);
}

void ssl_iostream_unref(struct ssl_iostream **_ssl_io)
{
    struct ssl_iostream *ssl_io = *_ssl_io;

    *_ssl_io = NULL;
    ssl_vfuncs->unref(ssl_io);
}

void ssl_iostream_destroy(struct ssl_iostream **_ssl_io)
{
    struct ssl_iostream *ssl_io = *_ssl_io;

    *_ssl_io = NULL;
    ssl_vfuncs->destroy(ssl_io);
}

void ssl_iostream_set_log_prefix(struct ssl_iostream *ssl_io,
                 const char *prefix)
{
    ssl_vfuncs->set_log_prefix(ssl_io, prefix);
}

int ssl_iostream_handshake(struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->handshake(ssl_io);
}

void ssl_iostream_set_handshake_callback(struct ssl_iostream *ssl_io,
                     ssl_iostream_handshake_callback_t *callback,
                     void *context)
{
    ssl_vfuncs->set_handshake_callback(ssl_io, callback, context);
}

bool ssl_iostream_is_handshaked(const struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->is_handshaked(ssl_io);
}

bool ssl_iostream_has_handshake_failed(const struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->has_handshake_failed(ssl_io);
}

bool ssl_iostream_has_valid_client_cert(const struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->has_valid_client_cert(ssl_io);
}

bool ssl_iostream_has_broken_client_cert(struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->has_broken_client_cert(ssl_io);
}

int ssl_iostream_cert_match_name(struct ssl_iostream *ssl_io, const char *name)
{
    return ssl_vfuncs->cert_match_name(ssl_io, name);
}

int ssl_iostream_check_cert_validity(struct ssl_iostream *ssl_io,
                     const char *host, const char **error_r)
{
    if (!ssl_iostream_has_valid_client_cert(ssl_io)) {
        if (!ssl_iostream_has_broken_client_cert(ssl_io))
            *error_r = "SSL certificate not received";
        else {
            *error_r = t_strdup(ssl_iostream_get_last_error(ssl_io));
            if (*error_r == NULL)
                *error_r = "Received invalid SSL certificate";
        }
        return -1;
    } else if (ssl_iostream_cert_match_name(ssl_io, host) < 0) {
        *error_r = t_strdup_printf(
            "SSL certificate doesn't match expected host name %s",
            host);
        return -1;
    }
    return 0;
}

const char *ssl_iostream_get_peer_name(struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->get_peer_name(ssl_io);
}

const char *ssl_iostream_get_server_name(struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->get_server_name(ssl_io);
}

const char *ssl_iostream_get_security_string(struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->get_security_string(ssl_io);
}

const char *ssl_iostream_get_last_error(struct ssl_iostream *ssl_io)
{
    return ssl_vfuncs->get_last_error(ssl_io);
}