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added execve and multi-configuration support

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This commit is contained in:
Cristian Toader 2013-08-05 15:40:23 +03:00
parent d897690fc7
commit 356b646976
3 changed files with 67 additions and 42 deletions
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101
src/common/sandbox.c
View File

@ -126,7 +126,7 @@ static int filter_nopar_gen[] = {
};
static int
sb_rt_sigaction(scmp_filter_ctx ctx)
sb_rt_sigaction(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int i, rc;
int param[] = { SIGINT, SIGTERM, SIGPIPE, SIGUSR1, SIGUSR2, SIGHUP, SIGCHLD,
@ -146,19 +146,18 @@ sb_rt_sigaction(scmp_filter_ctx ctx)
}
static int
sb_execve(scmp_filter_ctx ctx)
sb_execve(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc;
sandbox_cfg_t *elem;
sandbox_cfg_t *elem = NULL;
// for each dynamic parameter filters
elem = filter_dynamic;
for (; elem != NULL; elem = elem->next) {
for (elem = filter; elem != NULL; elem = elem->next) {
if (elem->prot == 1 && elem->syscall == SCMP_SYS(execve)) {
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(execve), 1,
SCMP_CMP(0, SCMP_CMP_EQ, elem->param));
if (rc != 0) {
log_err(LD_BUG,"(Sandbox) failed to add syscall, received libseccomp "
log_err(LD_BUG,"(Sandbox) failed to add execve syscall, received libseccomp "
"error %d", rc);
return rc;
}
@ -169,14 +168,14 @@ sb_execve(scmp_filter_ctx ctx)
}
static int
sb_time(scmp_filter_ctx ctx)
sb_time(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
return seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(time), 1,
SCMP_CMP(0, SCMP_CMP_EQ, 0));
}
static int
sb_accept4(scmp_filter_ctx ctx)
sb_accept4(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
return seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(socketcall), 1,
SCMP_CMP(0, SCMP_CMP_EQ, 18));
@ -184,7 +183,7 @@ sb_accept4(scmp_filter_ctx ctx)
#ifdef __NR_mmap2
static int
sb_mmap2(scmp_filter_ctx ctx)
sb_mmap2(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -208,19 +207,18 @@ sb_mmap2(scmp_filter_ctx ctx)
// TODO parameters
static int
sb_open(scmp_filter_ctx ctx)
sb_open(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc;
sandbox_cfg_t *elem;
sandbox_cfg_t *elem = NULL;
// for each dynamic parameter filters
elem = filter_dynamic;
for (; elem != NULL; elem = elem->next) {
for (elem = filter; elem != NULL; elem = elem->next) {
if (elem->prot == 1 && elem->syscall == SCMP_SYS(open)) {
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(open), 1,
SCMP_CMP(0, SCMP_CMP_EQ, elem->param));
if (rc != 0) {
log_err(LD_BUG,"(Sandbox) failed to add syscall, received libseccomp "
log_err(LD_BUG,"(Sandbox) failed to add open syscall, received libseccomp "
"error %d", rc);
return rc;
}
@ -232,19 +230,18 @@ sb_open(scmp_filter_ctx ctx)
// TODO parameters
static int
sb_openat(scmp_filter_ctx ctx)
sb_openat(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc;
sandbox_cfg_t *elem;
sandbox_cfg_t *elem = NULL;
// for each dynamic parameter filters
elem = filter_dynamic;
for (; elem != NULL; elem = elem->next) {
for (elem = filter; elem != NULL; elem = elem->next) {
if (elem->prot == 1 && elem->syscall == SCMP_SYS(openat)) {
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(openat), 1,
SCMP_CMP(1, SCMP_CMP_EQ, elem->param));
if (rc != 0) {
log_err(LD_BUG,"(Sandbox) failed to add syscall, received libseccomp "
log_err(LD_BUG,"(Sandbox) failed to add openat syscall, received libseccomp "
"error %d", rc);
return rc;
}
@ -255,7 +252,7 @@ sb_openat(scmp_filter_ctx ctx)
}
static int
sb_clock_gettime(scmp_filter_ctx ctx)
sb_clock_gettime(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
return seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(clock_gettime), 1,
SCMP_CMP(0, SCMP_CMP_EQ, CLOCK_MONOTONIC));
@ -263,7 +260,7 @@ sb_clock_gettime(scmp_filter_ctx ctx)
// TODO: param not working
static int
sb_socket(scmp_filter_ctx ctx)
sb_socket(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -288,7 +285,7 @@ sb_socket(scmp_filter_ctx ctx)
// TODO: param not working
static int
sb_setsockopt(scmp_filter_ctx ctx)
sb_setsockopt(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -303,7 +300,7 @@ sb_setsockopt(scmp_filter_ctx ctx)
#ifdef __NR_fcntl64
static int
sb_fcntl64(scmp_filter_ctx ctx)
sb_fcntl64(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -324,7 +321,7 @@ sb_fcntl64(scmp_filter_ctx ctx)
// allows everything but will keep for now..
static int
sb_epoll_ctl(scmp_filter_ctx ctx)
sb_epoll_ctl(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -351,7 +348,7 @@ sb_epoll_ctl(scmp_filter_ctx ctx)
* this list.
*/
static int
sb_prctl(scmp_filter_ctx ctx)
sb_prctl(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -367,7 +364,7 @@ sb_prctl(scmp_filter_ctx ctx)
* does not NEED tobe here.. only occurs before filter
*/
static int
sb_mprotect(scmp_filter_ctx ctx)
sb_mprotect(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -383,7 +380,7 @@ sb_mprotect(scmp_filter_ctx ctx)
* does not NEED tobe here.. only occurs before filter
*/
static int
sb_rt_sigprocmask(scmp_filter_ctx ctx)
sb_rt_sigprocmask(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -399,7 +396,7 @@ sb_rt_sigprocmask(scmp_filter_ctx ctx)
* does not NEED tobe here.. only occurs before filter
*/
static int
sb_flock(scmp_filter_ctx ctx)
sb_flock(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -415,7 +412,7 @@ sb_flock(scmp_filter_ctx ctx)
* does not NEED tobe here.. only occurs before filter
*/
static int
sb_futex(scmp_filter_ctx ctx)
sb_futex(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -432,12 +429,12 @@ sb_futex(scmp_filter_ctx ctx)
* does not NEED tobe here.. only occurs before filter
*/
static int
sb_mremap(scmp_filter_ctx ctx)
sb_mremap(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(mremap), 1,
SCMP_CMP(1, SCMP_CMP_EQ, MREMAP_MAYMOVE));
SCMP_CMP(3, SCMP_CMP_EQ, MREMAP_MAYMOVE));
if (rc)
return rc;
@ -445,7 +442,7 @@ sb_mremap(scmp_filter_ctx ctx)
}
static int
sb_poll(scmp_filter_ctx ctx)
sb_poll(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
{
int rc = 0;
@ -543,8 +540,9 @@ sandbox_cfg_allow_open_filename(sandbox_cfg_t **cfg, char *file)
elem->ptype = PARAM_PTR;
elem->param = (intptr_t) prot_strdup((char*) file);
elem->prot = 1;
elem->next = filter_dynamic;
filter_dynamic = elem;
elem->next = *cfg;
*cfg = elem;
return 0;
}
@ -560,8 +558,9 @@ sandbox_cfg_allow_openat_filename(sandbox_cfg_t **cfg, char *file)
elem->ptype = PARAM_PTR;
elem->param = (intptr_t) prot_strdup((char*) file);;
elem->prot = 1;
elem->next = filter_dynamic;
filter_dynamic = elem;
elem->next = *cfg;
*cfg = elem;
return 0;
}
@ -577,8 +576,9 @@ sandbox_cfg_allow_execve(sandbox_cfg_t **cfg, char *com)
elem->ptype = PARAM_PTR;
elem->param = (intptr_t) prot_strdup((char*) com);;
elem->prot = 1;
elem->next = filter_dynamic;
filter_dynamic = elem;
elem->next = *cfg;
*cfg = elem;
return 0;
}
@ -590,9 +590,9 @@ add_param_filter(scmp_filter_ctx ctx, sandbox_cfg_t* cfg)
// function pointer
for (i = 0; i < ARRAY_LENGTH(filter_func); i++) {
if ((filter_func[i])(ctx)) {
log_err(LD_BUG,"(Sandbox) failed to add syscall, received libseccomp "
"error %d", rc);
if ((filter_func[i])(ctx, cfg)) {
log_err(LD_BUG,"(Sandbox) failed to add syscall %d, received libseccomp "
"error %d", i, rc);
return rc;
}
}
@ -745,6 +745,22 @@ install_sigsys_debugging(void)
return 0;
}
static int register_cfg(sandbox_cfg_t* cfg) {
sandbox_cfg_t *elem = NULL;
if (filter_dynamic == NULL) {
filter_dynamic = cfg;
return 0;
}
for (elem = filter_dynamic; elem->next != NULL; elem = elem->next);
elem->next = cfg;
return 0;
}
#endif // USE_LIBSECCOMP
#ifdef USE_LIBSECCOMP
@ -761,6 +777,9 @@ initialise_libseccomp_sandbox(sandbox_cfg_t* cfg)
if (install_syscall_filter(cfg))
return -2;
if (register_cfg(cfg))
return -3;
return 0;
}

4
src/common/sandbox.h
View File

@ -63,7 +63,8 @@ struct pfd_elem {
};
typedef struct pfd_elem sandbox_cfg_t;
typedef int (*sandbox_filter_func_t)(scmp_filter_ctx ctx);
typedef int (*sandbox_filter_func_t)(scmp_filter_ctx ctx,
sandbox_cfg_t *filter);
/**
* Linux 32 bit definitions
@ -90,6 +91,7 @@ const char* sandbox_intern_string(const char *param);
sandbox_cfg_t * sandbox_cfg_new();
int sandbox_cfg_allow_open_filename(sandbox_cfg_t **cfg, char *file);
int sandbox_cfg_allow_openat_filename(sandbox_cfg_t **cfg, char *file);
int sandbox_cfg_allow_execve(sandbox_cfg_t **cfg, char *com);
int sandbox_init(sandbox_cfg_t* cfg);
#endif /* SANDBOX_H_ */

4
src/or/main.c
View File

@ -2650,6 +2650,8 @@ sandbox_init_filter()
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-certs"));
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-certs.tmp"));
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("cached-consensus"));
sandbox_cfg_allow_open_filename(&cfg,
@ -2681,6 +2683,8 @@ sandbox_init_filter()
sandbox_cfg_allow_open_filename(&cfg,
get_datadir_fname("unparseable-desc"));
sandbox_cfg_allow_execve(&cfg, "/usr/local/bin/tor");
return cfg;
}