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sandbox os.remove

This commit is contained in:
Kartik K. Agaram 2022-03-17 15:38:50 -07:00
parent 1d3101507e
commit 56f1b97b9c
1 changed files with 18 additions and 5 deletions
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23
src/loslib.c
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@ -36,13 +36,26 @@ static int os_pushresult (lua_State *L, int i, const char *filename) {
} }
static char oslib_errbuf[1024] = {0};
static int os_remove (lua_State *L) { static int os_remove (lua_State *L) {
const char *filename = luaL_checkstring(L, 1); const char *filename = luaL_checkstring(L, 1);
if (starts_with(filename, "teliva_tmp_")) {
/* continue */
}
else if (starts_with(filename, "teliva_")) {
snprintf(oslib_errbuf, 1024, "app tried to remove file '%s'; that's never allowed for filenames starting with 'teliva_'", filename);
Previous_message = oslib_errbuf;
return os_pushresult(L, 0, filename);
}
else if (!file_operation_permitted(filename, "w")) {
snprintf(oslib_errbuf, 1024, "app tried to remove file '%s'; give it write permissions (ctrl-p) if that is expected", filename);
Previous_message = oslib_errbuf;
return os_pushresult(L, 0, filename);
}
return os_pushresult(L, remove(filename) == 0, filename); return os_pushresult(L, remove(filename) == 0, filename);
} }
static char oslib_errbuf[1024] = {0};
static int os_rename (lua_State *L) { static int os_rename (lua_State *L) {
const char *fromname = luaL_checkstring(L, 1); const char *fromname = luaL_checkstring(L, 1);
const char *toname = luaL_checkstring(L, 2); const char *toname = luaL_checkstring(L, 2);
@ -52,12 +65,12 @@ static int os_rename (lua_State *L) {
/* continue */ /* continue */
} }
else if (starts_with(fromname, "teliva_")) { else if (starts_with(fromname, "teliva_")) {
snprintf(oslib_errbuf, 1024, "app tried to open file '%s'; that's never allowed for filenames starting with 'teliva_'", fromname); snprintf(oslib_errbuf, 1024, "app tried to rename file '%s'; that's never allowed for filenames starting with 'teliva_'", fromname);
Previous_message = oslib_errbuf; Previous_message = oslib_errbuf;
return os_pushresult(L, 0, fromname); return os_pushresult(L, 0, fromname);
} }
else if (!file_operation_permitted(fromname, "r")) { else if (!file_operation_permitted(fromname, "r")) {
snprintf(oslib_errbuf, 1024, "app tried to open file '%s' for reading; adjust its permissions (ctrl-p) if that is expected", fromname); snprintf(oslib_errbuf, 1024, "app tried to rename file '%s'; give it read permissions (ctrl-p) if that is expected", fromname);
Previous_message = oslib_errbuf; Previous_message = oslib_errbuf;
return os_pushresult(L, 0, fromname); return os_pushresult(L, 0, fromname);
} }
@ -65,12 +78,12 @@ static int os_rename (lua_State *L) {
/* continue */ /* continue */
} }
else if (starts_with(toname, "teliva_")) { else if (starts_with(toname, "teliva_")) {
snprintf(oslib_errbuf, 1024, "app tried to open file '%s'; that's never allowed for filenames starting with 'teliva_'", toname); snprintf(oslib_errbuf, 1024, "app tried to rename to file '%s'; that's never allowed for filenames starting with 'teliva_'", toname);
Previous_message = oslib_errbuf; Previous_message = oslib_errbuf;
return os_pushresult(L, 0, toname); return os_pushresult(L, 0, toname);
} }
else if (!file_operation_permitted(toname, "w")) { else if (!file_operation_permitted(toname, "w")) {
snprintf(oslib_errbuf, 1024, "app tried to open file '%s' for writing; adjust its permissions (ctrl-p) if that is expected", toname); snprintf(oslib_errbuf, 1024, "app tried to rename to file '%s'; give it write permissions (ctrl-p) if that is expected", toname);
Previous_message = oslib_errbuf; Previous_message = oslib_errbuf;
return os_pushresult(L, 0, toname); return os_pushresult(L, 0, toname);
} }