diff --git a/src/libstore/build/local-derivation-goal.cc b/src/libstore/build/local-derivation-goal.cc index 35e7ce907..84d3b4a73 100644 --- a/src/libstore/build/local-derivation-goal.cc +++ b/src/libstore/build/local-derivation-goal.cc @@ -52,6 +52,9 @@ #if __APPLE__ #include #include + +/* This definition is undocumented but depended upon by all major browsers. */ +extern "C" int sandbox_init_with_parameters(const char *profile, uint64_t flags, const char *const parameters[], char **errorbuf); #endif #include @@ -1711,7 +1714,7 @@ void LocalDerivationGoal::runChild() (which may run under a different uid and/or in a sandbox). */ std::string netrcData; try { - if (drv->isBuiltin() && drv->builder == "builtin:fetchurl") + if (drv->isBuiltin() && drv->builder == "builtin:fetchurl" && !derivationType->isSandboxed()) netrcData = readFile(settings.netrcFile); } catch (SysError &) { } @@ -2005,140 +2008,131 @@ void LocalDerivationGoal::runChild() std::string builder = "invalid"; - if (drv->isBuiltin()) { - ; - } #if __APPLE__ - else { - /* This has to appear before import statements. */ - std::string sandboxProfile = "(version 1)\n"; + /* This has to appear before import statements. */ + std::string sandboxProfile = "(version 1)\n"; - if (useChroot) { + if (useChroot) { - /* Lots and lots and lots of file functions freak out if they can't stat their full ancestry */ - PathSet ancestry; + /* Lots and lots and lots of file functions freak out if they can't stat their full ancestry */ + PathSet ancestry; - /* We build the ancestry before adding all inputPaths to the store because we know they'll - all have the same parents (the store), and there might be lots of inputs. This isn't - particularly efficient... I doubt it'll be a bottleneck in practice */ - for (auto & i : pathsInChroot) { - Path cur = i.first; - while (cur.compare("/") != 0) { - cur = dirOf(cur); - ancestry.insert(cur); - } - } - - /* And we want the store in there regardless of how empty pathsInChroot. We include the innermost - path component this time, since it's typically /nix/store and we care about that. */ - Path cur = worker.store.storeDir; + /* We build the ancestry before adding all inputPaths to the store because we know they'll + all have the same parents (the store), and there might be lots of inputs. This isn't + particularly efficient... I doubt it'll be a bottleneck in practice */ + for (auto & i : pathsInChroot) { + Path cur = i.first; while (cur.compare("/") != 0) { - ancestry.insert(cur); cur = dirOf(cur); + ancestry.insert(cur); } + } - /* Add all our input paths to the chroot */ - for (auto & i : inputPaths) { - auto p = worker.store.printStorePath(i); - pathsInChroot[p] = p; - } + /* And we want the store in there regardless of how empty pathsInChroot. We include the innermost + path component this time, since it's typically /nix/store and we care about that. */ + Path cur = worker.store.storeDir; + while (cur.compare("/") != 0) { + ancestry.insert(cur); + cur = dirOf(cur); + } - /* Violations will go to the syslog if you set this. Unfortunately the destination does not appear to be configurable */ - if (settings.darwinLogSandboxViolations) { - sandboxProfile += "(deny default)\n"; - } else { - sandboxProfile += "(deny default (with no-log))\n"; - } + /* Add all our input paths to the chroot */ + for (auto & i : inputPaths) { + auto p = worker.store.printStorePath(i); + pathsInChroot[p] = p; + } - sandboxProfile += - #include "sandbox-defaults.sb" - ; - - if (!derivationType->isSandboxed()) - sandboxProfile += - #include "sandbox-network.sb" - ; - - /* Add the output paths we'll use at build-time to the chroot */ - sandboxProfile += "(allow file-read* file-write* process-exec\n"; - for (auto & [_, path] : scratchOutputs) - sandboxProfile += fmt("\t(subpath \"%s\")\n", worker.store.printStorePath(path)); - - sandboxProfile += ")\n"; - - /* Our inputs (transitive dependencies and any impurities computed above) - - without file-write* allowed, access() incorrectly returns EPERM - */ - sandboxProfile += "(allow file-read* file-write* process-exec\n"; - for (auto & i : pathsInChroot) { - if (i.first != i.second.source) - throw Error( - "can't map '%1%' to '%2%': mismatched impure paths not supported on Darwin", - i.first, i.second.source); - - std::string path = i.first; - auto optSt = maybeLstat(path.c_str()); - if (!optSt) { - if (i.second.optional) - continue; - throw SysError("getting attributes of required path '%s", path); - } - if (S_ISDIR(optSt->st_mode)) - sandboxProfile += fmt("\t(subpath \"%s\")\n", path); - else - sandboxProfile += fmt("\t(literal \"%s\")\n", path); - } - sandboxProfile += ")\n"; - - /* Allow file-read* on full directory hierarchy to self. Allows realpath() */ - sandboxProfile += "(allow file-read*\n"; - for (auto & i : ancestry) { - sandboxProfile += fmt("\t(literal \"%s\")\n", i); - } - sandboxProfile += ")\n"; - - sandboxProfile += additionalSandboxProfile; - } else - sandboxProfile += - #include "sandbox-minimal.sb" - ; - - debug("Generated sandbox profile:"); - debug(sandboxProfile); - - Path sandboxFile = tmpDir + "/.sandbox.sb"; - - writeFile(sandboxFile, sandboxProfile); - - bool allowLocalNetworking = parsedDrv->getBoolAttr("__darwinAllowLocalNetworking"); - - /* The tmpDir in scope points at the temporary build directory for our derivation. Some packages try different mechanisms - to find temporary directories, so we want to open up a broader place for them to dump their files, if needed. */ - Path globalTmpDir = canonPath(getEnvNonEmpty("TMPDIR").value_or("/tmp"), true); - - /* They don't like trailing slashes on subpath directives */ - if (globalTmpDir.back() == '/') globalTmpDir.pop_back(); - - if (getEnv("_NIX_TEST_NO_SANDBOX") != "1") { - builder = "/usr/bin/sandbox-exec"; - args.push_back("sandbox-exec"); - args.push_back("-f"); - args.push_back(sandboxFile); - args.push_back("-D"); - args.push_back("_GLOBAL_TMP_DIR=" + globalTmpDir); - if (allowLocalNetworking) { - args.push_back("-D"); - args.push_back(std::string("_ALLOW_LOCAL_NETWORKING=1")); - } - args.push_back(drv->builder); + /* Violations will go to the syslog if you set this. Unfortunately the destination does not appear to be configurable */ + if (settings.darwinLogSandboxViolations) { + sandboxProfile += "(deny default)\n"; } else { - builder = drv->builder; - args.push_back(std::string(baseNameOf(drv->builder))); + sandboxProfile += "(deny default (with no-log))\n"; + } + + sandboxProfile += + #include "sandbox-defaults.sb" + ; + + if (!derivationType->isSandboxed()) + sandboxProfile += + #include "sandbox-network.sb" + ; + + /* Add the output paths we'll use at build-time to the chroot */ + sandboxProfile += "(allow file-read* file-write* process-exec\n"; + for (auto & [_, path] : scratchOutputs) + sandboxProfile += fmt("\t(subpath \"%s\")\n", worker.store.printStorePath(path)); + + sandboxProfile += ")\n"; + + /* Our inputs (transitive dependencies and any impurities computed above) + + without file-write* allowed, access() incorrectly returns EPERM + */ + sandboxProfile += "(allow file-read* file-write* process-exec\n"; + for (auto & i : pathsInChroot) { + if (i.first != i.second.source) + throw Error( + "can't map '%1%' to '%2%': mismatched impure paths not supported on Darwin", + i.first, i.second.source); + + std::string path = i.first; + struct stat st; + if (lstat(path.c_str(), &st)) { + if (i.second.optional && errno == ENOENT) + continue; + throw SysError("getting attributes of path '%s", path); + } + if (S_ISDIR(st.st_mode)) + sandboxProfile += fmt("\t(subpath \"%s\")\n", path); + else + sandboxProfile += fmt("\t(literal \"%s\")\n", path); + } + sandboxProfile += ")\n"; + + /* Allow file-read* on full directory hierarchy to self. Allows realpath() */ + sandboxProfile += "(allow file-read*\n"; + for (auto & i : ancestry) { + sandboxProfile += fmt("\t(literal \"%s\")\n", i); + } + sandboxProfile += ")\n"; + + sandboxProfile += additionalSandboxProfile; + } else + sandboxProfile += + #include "sandbox-minimal.sb" + ; + + debug("Generated sandbox profile:"); + debug(sandboxProfile); + + bool allowLocalNetworking = parsedDrv->getBoolAttr("__darwinAllowLocalNetworking"); + + /* The tmpDir in scope points at the temporary build directory for our derivation. Some packages try different mechanisms + to find temporary directories, so we want to open up a broader place for them to dump their files, if needed. */ + Path globalTmpDir = canonPath(getEnvNonEmpty("TMPDIR").value_or("/tmp"), true); + + /* They don't like trailing slashes on subpath directives */ + if (globalTmpDir.back() == '/') globalTmpDir.pop_back(); + + if (getEnv("_NIX_TEST_NO_SANDBOX") != "1") { + Strings sandboxArgs; + sandboxArgs.push_back("_GLOBAL_TMP_DIR"); + sandboxArgs.push_back(globalTmpDir); + if (allowLocalNetworking) { + sandboxArgs.push_back("_ALLOW_LOCAL_NETWORKING"); + sandboxArgs.push_back("1"); + } + if (sandbox_init_with_parameters(sandboxProfile.c_str(), 0, stringsToCharPtrs(sandboxArgs).data(), NULL)) { + writeFull(STDERR_FILENO, "failed to configure sandbox\n"); + _exit(1); } } + + builder = drv->builder; + args.push_back(std::string(baseNameOf(drv->builder))); #else - else { + if (!drv->isBuiltin()) { builder = drv->builder; args.push_back(std::string(baseNameOf(drv->builder))); }