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fix: Run all derivation builders inside the sandbox on macOS

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This commit is contained in:
Puck Meerburg 2024-03-01 11:42:24 -05:00 committed by Robert Hensing
parent 766263d53a
commit d2c880b03f
3 changed files with 123 additions and 122 deletions
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6
configure.ac
View file

@ -62,12 +62,16 @@ AC_CHECK_TOOL([AR], [ar])
AC_SYS_LARGEFILE
# Solaris-specific stuff.
# OS-specific stuff.
case "$host_os" in
solaris*)
# Solaris requires -lsocket -lnsl for network functions
LDFLAGS="-lsocket -lnsl $LDFLAGS"
;;
darwin*)
# Need to link to libsandbox.
LDFLAGS="-lsandbox $LDFLAGS"
;;
esac

2
package.nix
View file

@ -23,6 +23,7 @@
, libseccomp
, libsodium
, man
, darwin
, lowdown
, mdbook
, mdbook-linkcheck
@ -232,6 +233,7 @@ in {
gtest
rapidcheck
] ++ lib.optional stdenv.isLinux libseccomp
++ lib.optional stdenv.hostPlatform.isDarwin darwin.apple_sdk.libs.sandbox
++ lib.optional stdenv.hostPlatform.isx86_64 libcpuid
# There have been issues building these dependencies
++ lib.optional (stdenv.hostPlatform == stdenv.buildPlatform && (stdenv.isLinux || stdenv.isDarwin))

237
src/libstore/unix/build/local-derivation-goal.cc
View file

@ -58,6 +58,10 @@
#if __APPLE__
#include <spawn.h>
#include <sys/sysctl.h>
#include <sandbox.h>
/* 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 <pwd.h>
@ -2088,141 +2092,132 @@ 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 put their files, if needed. */
Path globalTmpDir = canonPath(defaultTempDir(), true);
/* They don't like trailing slashes on subpath directives */
while (!globalTmpDir.empty() && 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;
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);
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 put their files, if needed. */
Path globalTmpDir = canonPath(defaultTempDir(), true);
/* They don't like trailing slashes on subpath directives */
while (!globalTmpDir.empty() && 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)));
}