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integrated context for dynamic filters

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This commit is contained in:
Cristian Toader 2013-07-25 14:08:02 +03:00
parent 3dfe1c0639
commit 626a2b23de
3 changed files with 60 additions and 34 deletions
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48
src/common/sandbox.c
View File

@ -228,12 +228,6 @@ prot_strdup(char* str)
return res;
}
sandbox_cfg_t*
sandbox_cfg_new()
{
return NULL;
}
int
sandbox_cfg_allow_open_filename(sandbox_cfg_t **cfg, char *file)
{
@ -253,7 +247,7 @@ sandbox_cfg_allow_open_filename(sandbox_cfg_t **cfg, char *file)
}
static int
add_param_filter(scmp_filter_ctx ctx)
add_param_filter(scmp_filter_ctx ctx, sandbox_cfg_t* cfg)
{
int i, filter_size, rc = 0;
sandbox_cfg_t *elem;
@ -265,7 +259,8 @@ add_param_filter(scmp_filter_ctx ctx)
}
// for each dynamic parameter filters
for (elem = filter_dynamic; elem != NULL; elem = elem->next) {
elem = (cfg == NULL) ? filter_dynamic : cfg;
for (; elem != NULL; elem = elem->next) {
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, elem->syscall, 1,
SCMP_CMP(elem->pindex, SCMP_CMP_EQ, elem->param));
if (rc != 0) {
@ -327,7 +322,7 @@ add_noparam_filter(scmp_filter_ctx ctx)
* Returns 0 on success.
*/
static int
install_glob_syscall_filter(void)
install_syscall_filter(sandbox_cfg_t* cfg)
{
int rc = 0;
scmp_filter_ctx ctx;
@ -340,7 +335,7 @@ install_glob_syscall_filter(void)
}
// add parameter filters
if ((rc = add_param_filter(ctx))) {
if ((rc = add_param_filter(ctx, cfg))) {
log_err(LD_BUG, "(Sandbox) failed to add param filters!");
goto end;
}
@ -450,12 +445,12 @@ install_sigsys_debugging(void)
* into account various available features for different linux flavours.
*/
static int
initialise_libseccomp_sandbox(void)
initialise_libseccomp_sandbox(sandbox_cfg_t* cfg)
{
if (install_sigsys_debugging())
return -1;
if (install_glob_syscall_filter())
if (install_syscall_filter(cfg))
return -2;
return 0;
@ -463,6 +458,33 @@ initialise_libseccomp_sandbox(void)
#endif // USE_LIBSECCOMP
sandbox_cfg_t*
sandbox_cfg_new() {
return NULL;
}
int
sandbox_init(sandbox_cfg_t* cfg)
{
#if defined(USE_LIBSECCOMP)
return initialise_libseccomp_sandbox(cfg);
#elif defined(_WIN32)
log_warn(LD_BUG,"Windows sandboxing is not implemented. The feature is "
"currently disabled.");
return 0;
#elif defined(TARGET_OS_MAC)
log_warn(LD_BUG,"Mac OSX sandboxing is not implemented. The feature is "
"currently disabled");
return 0;
#else
log_warn(LD_BUG,"Sandboxing is not implemented for your platform. The "
"feature is currently disabled");
return 0;
#endif
}
/**
* Enables the stage 1 general sandbox. It applies a syscall filter which does
* not restrict any Tor features. The filter is representative for the whole
@ -473,7 +495,7 @@ tor_global_sandbox(void)
{
#if defined(USE_LIBSECCOMP)
return initialise_libseccomp_sandbox();
return initialise_libseccomp_sandbox(NULL);
#elif defined(_WIN32)
log_warn(LD_BUG,"Windows sandboxing is not implemented. The feature is "

3
src/common/sandbox.h
View File

@ -81,7 +81,10 @@ typedef struct pfd_elem sandbox_cfg_t;
void sandbox_set_debugging_fd(int fd);
int tor_global_sandbox(void);
char* get_prot_param(char *param);
sandbox_cfg_t * sandbox_cfg_new();
int sandbox_cfg_allow_open_filename(sandbox_cfg_t **cfg, char *file);
int sandbox_init(sandbox_cfg_t* cfg);
#endif /* SANDBOX_H_ */

43
src/or/main.c
View File

@ -2639,41 +2639,43 @@ find_flashcard_path(PWCHAR path, size_t size)
}
#endif
static int
sandbox_cfg_init_open()
static sandbox_cfg_t*
sandbox_init_filter()
{
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_t *cfg = sandbox_cfg_new();
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-certs"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-consensus"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("unverified-consensus"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-microdesc-consensus"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-microdesc-consensus.tmp"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-microdescs"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-microdescs.tmp"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-microdescs.new"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("unverified-microdesc-consensus"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-descriptors"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-descriptors.new"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-extrainfo"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("state.tmp"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("unparseable-desc.tmp"));
sandbox_cfg_allow_open_filename(NULL,
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("unparseable-desc"));
return 0;
return cfg;
}
/** Main entry point for the Tor process. Called from main(). */
@ -2744,10 +2746,9 @@ tor_main(int argc, char *argv[])
return -1;
if (get_options()->Sandbox) {
if (sandbox_cfg_init_open() < 0)
return -1;
sandbox_cfg_t* cfg = sandbox_init_filter();
if (tor_global_sandbox()) {
if (sandbox_init(cfg)) {
log_err(LD_BUG,"Failed to create syscall sandbox filter");
return -1;
}