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Fix passing custom CA files into the builtin:fetchurl sandbox

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Without this, verifying TLS certificates would fail on macOS, as well
as any system that doesn't have a certificate file at /etc/ssl/certs/ca-certificates.crt,
which includes e.g. Fedora.

Change-Id: Iaa2e0e9db3747645b5482c82e3e0e4e8f229f5f9
This commit is contained in:
puck 2024-09-26 15:12:24 +00:00
parent c1631b0a39
commit 37b22dae04
4 changed files with 24 additions and 8 deletions
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15
src/libstore/build/local-derivation-goal.cc
View file

@ -1361,14 +1361,21 @@ void LocalDerivationGoal::runChild()
bool setUser = true;
/* Make the contents of netrc available to builtin:fetchurl
(which may run under a different uid and/or in a sandbox). */
/* Make the contents of netrc and the CA certificate bundle
available to builtin:fetchurl (which may run under a
different uid and/or in a sandbox). */
std::string netrcData;
std::string caFileData;
if (drv->isBuiltin() && drv->builder == "builtin:fetchurl" && !derivationType->isSandboxed()) {
try {
if (drv->isBuiltin() && drv->builder == "builtin:fetchurl" && !derivationType->isSandboxed())
netrcData = readFile(settings.netrcFile);
} catch (SysError &) { }
try {
caFileData = readFile(settings.caFile);
} catch (SysError &) { }
}
#if __linux__
if (useChroot) {
@ -1802,7 +1809,7 @@ void LocalDerivationGoal::runChild()
e.second = rewriteStrings(e.second, inputRewrites);
if (drv->builder == "builtin:fetchurl")
builtinFetchurl(drv2, netrcData);
builtinFetchurl(drv2, netrcData, caFileData);
else if (drv->builder == "builtin:buildenv")
builtinBuildenv(drv2);
else if (drv->builder == "builtin:unpack-channel")

2
src/libstore/builtins.hh
View file

@ -6,7 +6,7 @@
namespace nix {
// TODO: make pluggable.
void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData);
void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData, const std::string & caFileData);
void builtinUnpackChannel(const BasicDerivation & drv);
}

5
src/libstore/builtins/fetchurl.cc
View file

@ -7,7 +7,7 @@
namespace nix {
void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData, const std::string & caFileData)
{
/* Make the host's netrc data available. Too bad curl requires
this to be stored in a file. It would be nice if we could just
@ -17,6 +17,9 @@ void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
writeFile(settings.netrcFile, netrcData, 0600);
}
settings.caFile = "ca-certificates.crt";
writeFile(settings.caFile, caFileData, 0600);
auto getAttr = [&](const std::string & name) {
auto i = drv.env.find(name);
if (i == drv.env.end()) throw Error("attribute '%s' missing", name);

6
tests/nixos/fetchurl.nix
View file

@ -67,6 +67,9 @@ in
out = machine.succeed("curl https://good/index.html")
assert out == "hello world\n"
out = machine.succeed("cat ${badCert}/cert.pem > /tmp/cafile.pem; curl --cacert /tmp/cafile.pem https://bad/index.html")
assert out == "foobar\n"
# Fetching from a server with a trusted cert should work.
machine.succeed("nix build --no-substitute --expr 'import <nix/fetchurl.nix> { url = \"https://good/index.html\"; hash = \"sha256-qUiQTy8PR5uPgZdpSzAYSw0u0cHNKh7A+4XSmaGSpEc=\"; }'")
@ -74,5 +77,8 @@ in
err = machine.fail("nix build --no-substitute --expr 'import <nix/fetchurl.nix> { url = \"https://bad/index.html\"; hash = \"sha256-rsBwZF/lPuOzdjBZN2E08FjMM3JHyXit0Xi2zN+wAZ8=\"; }' 2>&1")
print(err)
assert "SSL certificate problem: self-signed certificate" in err or "SSL peer certificate or SSH remote key was not OK" in err
# Fetching from a server with a trusted cert should work via environment variable override.
machine.succeed("NIX_SSL_CERT_FILE=/tmp/cafile.pem nix build --no-substitute --expr 'import <nix/fetchurl.nix> { url = \"https://bad/index.html\"; hash = \"sha256-rsBwZF/lPuOzdjBZN2E08FjMM3JHyXit0Xi2zN+wAZ8=\"; }'")
'';
}