Skip to content

Commit

Permalink
Merge remote-tracking branch 'nix-GHSA-wf4c-57rh-9pjg/advisory-fix-1-…
Browse files Browse the repository at this point in the history 
…2.18' into 2.18-maintenance
  • Loading branch information
@edolstra
edolstra committed Oct 30, 2024
2 parents 5f20e42 + d219faa commit bddbe3b
Show file tree
Hide file tree
Showing 3 changed files with 120 additions and 127 deletions.
6 changes: 5 additions & 1 deletion configure.ac
View file
Original file line number Diff line number Diff line change
Expand Up @@ -58,13 +58,17 @@ AC_CHECK_TOOL([AR], [ar])
AC_SYS_LARGEFILE


# Solaris-specific stuff.
# OS-specific stuff.
AC_STRUCT_DIRENT_D_TYPE
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


Expand Down
1 change: 1 addition & 0 deletions flake.nix
View file
Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,7 @@
boost
lowdown-nix
]
++ lib.optionals stdenv.isDarwin [darwin.apple_sdk.libs.sandbox]
++ lib.optionals stdenv.isLinux [(libseccomp.overrideAttrs (_: rec {
version = "2.5.5";
src = fetchurl {
Expand Down
240 changes: 114 additions & 126 deletions src/libstore/build/local-derivation-goal.cc
View file
Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,10 @@
#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>
Expand Down Expand Up @@ -2029,154 +2033,130 @@ void LocalDerivationGoal::runChild()
throw SysError("setuid failed");
}

/* Fill in the arguments. */
Strings args;
#if __APPLE__
/* This has to appear before import statements. */
std::string sandboxProfile = "(version 1)\n";

std::string builder = "invalid";
if (useChroot) {

if (drv->isBuiltin()) {
;
}
#if __APPLE__
else {
/* This has to appear before import statements. */
std::string sandboxProfile = "(version 1)\n";

if (useChroot) {

/* 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 : dirsInChroot) {
Path cur = i.first;
while (cur.compare("/") != 0) {
cur = dirOf(cur);
ancestry.insert(cur);
}
}
/* Lots and lots and lots of file functions freak out if they can't stat their full ancestry */
PathSet ancestry;

/* And we want the store in there regardless of how empty dirsInChroot. 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 : dirsInChroot) {
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);
dirsInChroot[p] = p;
}
/* And we want the store in there regardless of how empty dirsInChroot. 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);
dirsInChroot[p] = p;
}

sandboxProfile +=
#include "sandbox-defaults.sb"
;
/* 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";
}

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 : dirsInChroot) {
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";
sandboxProfile +=
#include "sandbox-defaults.sb"
;

/* 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
if (!derivationType->isSandboxed())
sandboxProfile +=
#include "sandbox-minimal.sb"
#include "sandbox-network.sb"
;

debug("Generated sandbox profile:");
debug(sandboxProfile);
/* 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));

Path sandboxFile = tmpDir + "/.sandbox.sb";
sandboxProfile += ")\n";

writeFile(sandboxFile, sandboxProfile);
/* Our inputs (transitive dependencies and any impurities computed above)
bool allowLocalNetworking = parsedDrv->getBoolAttr("__darwinAllowLocalNetworking");
without file-write* allowed, access() incorrectly returns EPERM
*/
sandboxProfile += "(allow file-read* file-write* process-exec\n";
for (auto & i : dirsInChroot) {
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);

/* 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(defaultTempDir(), true);
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";

/* They don't like trailing slashes on subpath directives */
while (!globalTmpDir.empty() && globalTmpDir.back() == '/')
globalTmpDir.pop_back();
/* 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";

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);
} else {
builder = drv->builder;
args.push_back(std::string(baseNameOf(drv->builder)));
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(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");
}
char * sandbox_errbuf = nullptr;
if (sandbox_init_with_parameters(sandboxProfile.c_str(), 0, stringsToCharPtrs(sandboxArgs).data(), &sandbox_errbuf)) {
writeFull(STDERR_FILENO, fmt("failed to configure sandbox: %s\n", sandbox_errbuf ? sandbox_errbuf : "(null)"));
_exit(1);
}
}
#else
else {
builder = drv->builder;
args.push_back(std::string(baseNameOf(drv->builder)));
}
#endif

for (auto & i : drv->args)
args.push_back(rewriteStrings(i, inputRewrites));

/* Indicate that we managed to set up the build environment. */
writeFull(STDERR_FILENO, std::string("\2\n"));

Expand Down Expand Up @@ -2206,6 +2186,14 @@ void LocalDerivationGoal::runChild()
}
}

// Now builder is not builtin

Strings args;
args.push_back(std::string(baseNameOf(drv->builder)));

for (auto & i : drv->args)
args.push_back(rewriteStrings(i, inputRewrites));

#if __APPLE__
posix_spawnattr_t attrp;

Expand All @@ -2227,9 +2215,9 @@ void LocalDerivationGoal::runChild()
posix_spawnattr_setbinpref_np(&attrp, 1, &cpu, NULL);
}

posix_spawn(NULL, builder.c_str(), NULL, &attrp, stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
posix_spawn(NULL, drv->builder.c_str(), NULL, &attrp, stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
#else
execve(builder.c_str(), stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
execve(drv->builder.c_str(), stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
#endif

throw SysError("executing '%1%'", drv->builder);
Expand Down

0 comments on commit bddbe3b

Please sign in to comment.